Heat sink for electronic components of a rotating electric machine

<u>Field of the invention</u>

0001The invention relates to a rotating electrical machine comprising a heat sink for electronic components, said electronic components being intended for the operation of a rotary electrical machine, said machine comprising a rear bearing, said heat sink comprising an upper face and a lower face incorporating fins.

0002The present invention applies to any type of polyphase, synchronous or asynchronous rotating electrical machines, such as alternators, alternator-starters, and even whether they are electrical machines for motor vehicles and driven for example by belt. , cooled by air, by liquid or by any other possible solution.

<u>State of the art</u>

0003In a motor vehicle comprising a heat engine and a rotating electric machine such as an alternator-starter, such an electric machine comprises, for example, without limitation:<ul id="ul0001" list-style="dash" compact="compact"><li>a rotor comprising an inductor into which an excitation current is supplied, and</li><li>a stator comprising a polyphase winding.</li></ul>The alternator-starter operates in engine mode or in generator mode. It is a so-called reversible machine. In generator or alternator mode, the machine makes it possible to transform a rotational movement of the rotor driven by the heat engine of the vehicle, into an electric current induced in the phases of the stator. In this case, a rectifier bridge connected to the phases of the stator makes it possible to rectify the induced sinusoidal current into a direct current to supply consumers of the vehicle as well as a battery. On the contrary, in motor mode, the electric machine acts as an electric motor making it possible to drive in rotation, via the rotor shaft, the heat engine of the vehicle. It transforms electrical energy into mechanical energy. In this case, an inverter makes it possible to transform a direct current coming from the battery into an alternating current to supply the phases of the stator to turn the rotor.

0004Control signals are used to determine the operating mode of the rotating electrical machine (motor mode or generator mode).

0005In the document <patcit id="pcit0001" dnum="DE102004007395A1"><text>DE102004007395A1</text></patcit>, the use of an external peripheral belt is known, said belt comprising internal partitions integrating:<ul id="ul0002" list-style="dash" compact="compact"><li>signal interconnection traces allowing the transmission / reception of signals to the electronic components of the rectifier / inverter bridge, and</li><li>power interconnection traces to connect the electronic components to the battery in order to supply them,</li></ul>all of the traces being superimposed on each other and being overmolded. The belt is positioned on the rear bearing of the machine. Furthermore, a heat sink is positioned above said belt.

0006One of the problems of such a solution is that there is only a flow of air pulsed by the fan of the rotating electrical machine to cool in particular said machine and the electronic components, said flow of air being an axial flow of air. . This single air flow may be insufficient to provide effective cooling.

0007The documents <patcit id="pcit0002" dnum="JPH1056762B"><text>JPH1056762</text></patcit>, <patcit id="pcit0003" dnum="EP1199785A"><text>EP1199785</text></patcit> and <patcit id="pcit0004" dnum="FR2797112"><text>FR2797112</text></patcit> describe different structures of rotating electrical machine with various cooling circuits.

<u>Disclosure of the invention</u>

0008Also, an object of the present invention is to provide a rotating electrical machine described in claim 1 and comprising in particular a dissipator for electronic components, said electronic components being intended for the operation of a rotating electrical machine, said machine comprising a rear bearing, said heat sink comprising an upper face and a lower face incorporating fins which allow the assembly of the rotating electrical machine and electronic components to be cooled more effectively.

0009To this end, according to the present invention, the heat sink is arranged between the rear bearing of said machine and said electronic components, said rear face integrating said fins facing said rear bearing.

0010Thus, as will be seen in detail later, this specific arrangement of the dissipator makes it possible to obtain an additional radial flow which will also be pulsed by the fan of the machine, and which added to a pulsed axial flow will increase the cooling of the machine and electronic components.

0011According to the invention, the heat sink is attached.

0012According to the invention, the heat sink has a boss on its underside at the level of the fins.

0013Still according to the invention, the boss has a first slope for guiding an axial air flow towards the interior of the machine, and a second slope for guiding a radial air flow towards the interior of the machine.

0014According to preferred non-limiting embodiments, the dissipator which is the subject of the invention has the additional characteristics set out below.<ul id="ul0003" list-style="dash"><li>the heatsink has a gap configured to pass air around a rotor shaft of the machine.</li><li>The spacing is wider than the diameter of the rotor shaft.</li><li>A power interconnection piece (21) is placed on the underside of the heat sink, said power piece making it possible to distribute power to said module.</li><li>At least one electronic module comprising electronic components is mounted on the upper face of said heat sink.</li><li>A signal interconnection piece is mounted on said electronic module, said signal interconnection piece being intended to convey control signals between electronic components.</li></ul>

0015Other characteristics and advantages of the present invention will emerge from the description below. This is purely illustrative and should be read in conjunction with the accompanying drawings, given by way of non-limiting examples.

<u>Brief description of the figures</u>

0016<ul id="ul0004" list-style="dash" compact="compact"><li>Fig. 1a represents a first embodiment of an electronic module,</li><li>The <figref idref="f0002">Fig. 1b</figref> represents the module of FIG. the view from below,</li><li>The <figref idref="f0003">Fig. 1 C</figref> is a view without overmolding of the module of the <figref idref="f0001">Fig. 1a</figref>,</li><li>The <figref idref="f0004">Fig. 1d</figref> is the view of the <figref idref="f0003">Fig. 1 C</figref> with wire links of the electronic components of the electronic module,</li><li>The <figref idref="f0005">Fig. 2a</figref> is a first variant of the first embodiment of the <figref idref="f0001">Fig. 1a</figref>,</li><li>The <figref idref="f0006">Fig. 2b</figref> is a bottom view of the module of the <figref idref="f0005">Fig. 2a</figref>,</li><li>The <figref idref="f0007">Fig. 2c</figref> is the view of the <figref idref="f0005">Fig. 2a</figref> with wire links of the electronic components of the electronic module,</li><li>The <figref idref="f0008">Fig. 2d</figref> is a second variant of the first embodiment of the <figref idref="f0005">Fig. 2a</figref>,</li><li>The <figref idref="f0009">Fig. 3a</figref> represents a second embodiment of an electronic module,</li><li>The <figref idref="f0010">Fig. 3b</figref> is a bottom view of the module of the <figref idref="f0009">Fig. 3a</figref>,</li><li>The <figref idref="f0011">Fig. 3c</figref> is a view without overmolding of the module of the <figref idref="f0009">Fig. 3a</figref>,</li><li>The <figref idref="f0012">Fig. 3d</figref> is a variant of the second embodiment of the <figref idref="f0009">Fig. 3a</figref>,</li><li>The <figref idref="f0013">Fig. 3rd</figref> is the view of the <figref idref="f0012">Fig. 3d</figref> with wire links of the electronic components of the electronic module,</li><li>The <figref idref="f0014">Fig. 4a</figref> is a third embodiment of the electronic module,</li><li>The <figref idref="f0015">Fig. 4b</figref> is a bottom view of the module of the <figref idref="f0014">Fig. 4a</figref>,</li><li>The <figref idref="f0016">Fig. 4c</figref> is a view without overmolding of the module of the <figref idref="f0014">Fig. 4a</figref>,</li><li>The <figref idref="f0017">Fig. 4d</figref> is a sectional view without overmolding of the module of the <figref idref="f0014">Fig. 4a</figref> incorporating a support plate,</li><li>The <figref idref="f0018">Fig. 4th</figref> is the view of the <figref idref="f0016">Fig. 4c</figref> with wire links of the electronic components of the electronic module,</li><li>The <figref idref="f0019">Fig. 5a</figref> is a variant of the third embodiment of the <figref idref="f0014">Fig. 4a</figref>,</li><li>The <figref idref="f0020">Fig. 5b</figref> is a bottom view of the module of the <figref idref="f0019">Fig. 5a</figref>,</li><li>The <figref idref="f0021">Fig. 5c</figref> is a first view from above without overmolding of the module of the <figref idref="f0019">Fig. 5a</figref>,</li><li>The <figref idref="f0022">Fig. 5d</figref> is a second view from below without overmolding of the module of the <figref idref="f0019">Fig. 5a</figref>,</li><li>The <figref idref="f0023">Fig. 5th</figref> is a third top view without pre-molding and without overmolding of the module of the <figref idref="f0019">Fig. 5a</figref>,</li><li>The <figref idref="f0024">Fig. 5f</figref> is a fourth view from below without pre-molding and without overmolding of the module of the <figref idref="f0020">Fig. 5b</figref>,</li><li>The <figref idref="f0025">Fig. 6</figref> shows a first embodiment of a dissipating bearing intended to receive a module of <figref idref="f0001 f0002 f0003 f0004">Fig. 1</figref> and <figref idref="f0005 f0006 f0007 f0008">2</figref>,</li><li>The <figref idref="f0026">Fig. 7</figref> shows a second embodiment of a dissipating bearing intended to receive a module of <figref idref="f0009 f0010 f0011 f0012 f0013">Fig. 3</figref>,</li><li>The <figref idref="f0027">Fig. 8a</figref> shows a first embodiment of a heat sink intended to receive a module of <figref idref="f0014 f0015 f0016 f0017 f0018">Fig. 4</figref> and <figref idref="f0019 f0020 f0021 f0022 f0023 f0024">5</figref>,</li><li>The <figref idref="f0028">Fig. 8b</figref> is a bottom view of the heatsink of the <figref idref="f0027">Fig. 8a</figref>,</li><li>The <figref idref="f0029">Fig. 8c</figref> is a sectional view of the <figref idref="f0028">Fig. 8b</figref>,</li><li>The <figref idref="f0030">Fig. 8d</figref> shows an axial air flow and a radial air flow in the heat sink of the <figref idref="f0028">Fig. 8b</figref>,</li><li>The <figref idref="f0031">Fig. 9a</figref> shows a first embodiment of a signal interconnection part intended to be placed on a module of the <figref idref="f0001 f0002 f0003 f0004">Fig. 1</figref> and <figref idref="f0005 f0006 f0007 f0008">2</figref>,</li><li>The <figref idref="f0032">Fig. 9b</figref> is a bottom view of the room from the <figref idref="f0031">Fig. 9a</figref>,</li><li>The <figref idref="f0033">Fig. 9c</figref> is a view without overmolding of the part of the <figref idref="f0031">Fig. 9a</figref>,</li><li>The <figref idref="f0034">Figure 10a</figref> shows a second embodiment of a signal interconnection part intended to be placed on a module of the <figref idref="f0009 f0010 f0011 f0012 f0013">Fig. 3</figref>,</li><li>The <figref idref="f0035">Fig. 10b</figref> is a bottom view of the signal interconnect part of the <figref idref="f0034">Fig. 10a</figref>,</li><li>The <figref idref="f0036">Fig. 10c</figref> is a view without overmolding of the signal interconnect part of the <figref idref="f0034">Fig. 10a</figref>,</li><li>The <figref idref="f0037">Figure 11a</figref> shows a third embodiment of a signal interconnection part intended to be placed on a module of the <figref idref="f0014 f0015 f0016 f0017 f0018">Fig. 4</figref> and <figref idref="f0019 f0020 f0021 f0022 f0023 f0024">5</figref>,</li><li>The <figref idref="f0038">Fig. 11b</figref> is a bottom view of the signal interconnect part of the <figref idref="f0037">Fig. 11a</figref>,</li><li>The <figref idref="f0039">Fig. 11c</figref> is another top view of the signal interconnect part of the <figref idref="f0037">Fig. 11a</figref>,</li><li>The <figref idref="f0040">Fig. 11d</figref> is a view without overmolding of the signal interconnect part of the <figref idref="f0037">Fig. 11a</figref>,</li><li>The <figref idref="f0041">Fig. 12a</figref> shows a first embodiment of a power interconnection part intended to be in contact with a module of the <figref idref="f0001 f0002 f0003 f0004">Fig. 1</figref> and <figref idref="f0005 f0006 f0007 f0008">2</figref>, and to be located above the signal interconnection piece of the <figref idref="f0031 f0032 f0033">Fig. 9</figref>,</li><li>The <figref idref="f0042">Fig. 12b</figref> is a bottom view of the room from the <figref idref="f0041">Fig. 12a</figref>,</li><li>The <figref idref="f0043">Fig. 12c</figref> is a view without overmolding of the part of the <figref idref="f0041">Fig. 12a</figref>,</li><li>The <figref idref="f0044">Fig. 13a</figref> shows a second embodiment of a power interconnection part intended to be in contact with a module of the <figref idref="f0009 f0010 f0011 f0012 f0013">Fig. 3</figref> and to be located above the signal interconnection piece of the <figref idref="f0034 f0035 f0036">Fig. 10</figref>,</li><li>The <figref idref="f0045">Fig. 13b</figref> is a bottom view of the room from the <figref idref="f0044">Fig. 13a</figref>,</li><li>The <figref idref="f0046">Fig. 13c</figref> is a view without overmolding of the part of the <figref idref="f0044">Fig. 13a</figref>,</li><li>The <figref idref="f0047">Fig. 14a</figref> shows a third embodiment of a power interconnection part intended to receive a dissipator of the <figref idref="f0027 f0028 f0029 f0030">Fig. 8</figref>,</li><li>The <figref idref="f0048">Fig. 14b</figref> is a bottom view of the room from the <figref idref="f0047">Fig. 14a</figref>,</li><li>The <figref idref="f0049">Fig. 14c</figref> is a view without overmolding of the part of the <figref idref="f0047">Fig. 14a</figref>,</li><li>The <figref idref="f0050">Fig. 14d</figref> is a view of the room from the <figref idref="f0047">Fig. 14a</figref> incorporating a collar,</li><li>The <figref idref="f0051">Fig. 14th</figref> is a view of the room from the <figref idref="f0050">Fig. 14d</figref> on a dissipating bearing,</li><li>The <figref idref="f0052">Fig. 15a</figref> is a first embodiment of a cover intended to be located above the power part of the <figref idref="f0041 f0042 f0043">Fig. 12</figref>,</li><li>The <figref idref="f0053">Fig. 15b</figref> is a top view of the hood of the <figref idref="f0052">Fig. 15a</figref>,</li><li>The <figref idref="f0054">Fig. 15c</figref> is a side view of the hood of the <figref idref="f0052">Fig. 15a</figref>,</li><li>The <figref idref="f0055">Fig. 16</figref> is a second embodiment of a cover intended to be located above the power part of the <figref idref="f0044 f0045 f0046">Fig. 13</figref>,</li><li>The <figref idref="f0056">Fig. 17a</figref> is a third embodiment of a cover intended to be located above the signal interconnection part of the <figref idref="f0037 f0038 f0039 f0040">Fig. 11</figref>,</li><li>The <figref idref="f0057">Fig. 17b</figref> is a top view of the hood of the <figref idref="f0056">Fig. 17a</figref>,</li><li>The <figref idref="f0058">Fig. 18</figref> shows an assembly of an electronic module of the <figref idref="f0001 f0002 f0003 f0004">Fig. 1</figref> and <figref idref="f0005 f0006 f0007 f0008">2</figref> on a dissipating bearing,</li><li>The <figref idref="f0059">Fig. 19</figref> shows an assembly of one piece of signal interconnection of <figref idref="f0031 f0032 f0033">Fig. 9</figref> on the dissipator-module bearing assembly of the <figref idref="f0058">Fig. 18</figref>,</li><li>The <figref idref="f0060">Figure 20</figref> shows an assembly of the power interconnection part of the <figref idref="f0041 f0042 f0043">Fig. 12</figref> on the heatsink bearing-module-signal interconnection part assembly of the <figref idref="f0059">Fig. 19</figref>,</li><li>The <figref idref="f0061">Fig. 21</figref> represents the layout of the <figref idref="f0060">Fig. 20</figref> with a cover in partial section,</li><li>The <figref idref="f0062">Fig. 22</figref> is a complete view of the layout according to <figref idref="f0061">Fig. 21</figref> with the cover in place, showing a positioning of the cover in relation to a module,</li><li>The <figref idref="f0063">Fig. 23</figref> shows an assembly of an electronic module of the <figref idref="f0009 f0010 f0011 f0012 f0013">Fig. 3</figref> on a dissipating bearing,</li><li>The <figref idref="f0064">Fig. 24</figref> shows an assembly of the signal interconnection part of the <figref idref="f0034 f0035 f0036">Fig. 10</figref> on the dissipator-module bearing assembly of the <figref idref="f0063">Fig. 23</figref>,</li><li>The <figref idref="f0065">Fig. 25</figref> shows an assembly of the power interconnection part of the <figref idref="f0041 f0042 f0043">Fig. 12</figref> on the heatsink bearing-module-signal interconnection part assembly of the <figref idref="f0064">Fig. 24</figref>.</li><li>The <figref idref="f0066">Fig. 26</figref> represents the layout of the <figref idref="f0065">Fig. 25</figref> with a cover in partial section,</li><li>The <figref idref="f0067">Fig. 27a</figref> represents an assembly of the modules of <figref idref="f0014 f0015 f0016 f0017 f0018">Fig. 4</figref> on a heat sink,</li><li>The <figref idref="f0068">Fig. 27b</figref> shows an assembly of the power interconnection part of the <figref idref="f0047 f0048 f0049 f0050 f0051">Fig. 14</figref> on a heat sink,</li><li>The <figref idref="f0069">Fig. 28</figref> shows an assembly of the power interconnection part of the <figref idref="f0047 f0048 f0049 f0050 f0051">Fig. 14</figref> on the heatsink-modules assembly of the <figref idref="f0067">Fig. 27a</figref>,</li><li>The <figref idref="f0070">Fig. 29</figref> shows a mounting of the signal interconnection piece on the entire <figref idref="f0069">Fig. 28</figref>,</li><li>The <figref idref="f0071">Fig. 30a</figref> is an assembly of the whole <figref idref="f0070">Fig. 29</figref> on a landing,</li><li>The <figref idref="f0072">Fig. 30b</figref> is a section along an XY plane of the <figref idref="f0071">Fig. 30a</figref> of the assembled power interconnect part of the <figref idref="f0047">Fig. 14a</figref>, and</li><li>The <figref idref="f0073">Fig. 30c</figref> represents a bearing on which the whole of the <figref idref="f0070">Fig. 29</figref>.</li></ul>

<u>Detailed description of an embodiment of the invention</u>

0017It will be noted that in the remainder of the description, the outside diameter of the machine is defined as the diameter of a bearing of the machine excluding the mounting bracket.

<u>Electronic module</u>

0018It will be noted that an electronic module is a set of electronic components which are arranged in a housing and include connection elements accessible from the outside for its operation, these elements making it possible to transmit control and / or power signals.

0019Fig. represents her<b>a first non-limiting embodiment</b> of an electronic module 10. Said module 10 comprises:<ul id="ul0005" list-style="dash" compact="compact"><li>A 101 box,</li><li>electronic components 102 located in a central zone 1021 covered with a protective gel such as a silicone gel or epoxy resin, and a protective plastic cover,</li><li>electrical conductors 103 (B +), 104 (B-)</li><li>signal connection elements 106, and</li><li>fixing points 108.</li></ul>

0020In addition, said module 10 comprises, as shown in the bottom view of the <figref idref="f0002">Fig. 1b</figref> : <ul id="ul0006" list-style="dash" compact="compact"><li>positioning means 109 of the module 10 on a dissipating bearing.</li></ul>

0021The different elements of said module 10 are described below.<ul id="ul0007" list-style="bullet" compact="compact"><li>The housing 101 is made of an electrically insulating material. Preferably, the housing has a substantially triangular base shape, so it has at least three side faces and an upper face and a lower face. This shape will make it possible to use a maximum of surface on the cylindrical rear of the machine, and this in an optimal way.</li></ul>Furthermore, preferably, one of the faces of the module 10 is an arc of a circle. This makes it possible to match the general shape of the machine.

0022Of course, other shapes could be used, such as a substantially rectangular shape.<ul id="ul0008" list-style="bullet" compact="compact"><li>The electric power supply conductors 103 (B +), 104 (B-) make it possible to convey a current coming from the battery through the electronic elements.</li></ul>In a preferred embodiment, the conductors are two traces of power connection 103, 104, the ends of which are arranged on the outer periphery of the module. Preferably, said traces are made of copper. Thus, unlike an architecture in which the power required for each module passes through all the modules or in which an electronic power card is located in a box separate from the machine, this configuration has the following advantages:<ul id="ul0009" list-style="dash" compact="compact"><li>this allows the salt spray to flow to the outside of the machine instead of piling up in the center of said machine, which prevents corrosion of the traces by said salt spray,</li><li>there is less heating in the modules because the power required for a module only passes through said module,</li><li>the welds of the ends of the tracks are carried out on a single radius which allows better automation of the weld,</li><li>this also allows balancing of the current in the modules, in fact each module is supplied independently, ie they are supplied in parallel.</li></ul>

0023In a first variant of this mode, the power traces 103, 104 extend along a plane parallel to that along which the block of electronic elements extends. This allows axial laser welding with respect to the axis of the machine.

0024In a second variant, the traces extend along two planes parallel to each other and parallel to the plane of the block of electronic elements.

0025It will be noted that the term “trace” is understood to mean a cut sheet formed from a metal such as copper.<ul id="ul0010" list-style="bullet" compact="compact"><li>The signal connection elements 106, called signal connections, make it possible to convey control signals for controlling the electronic elements 102. They thus make it possible to send and receive information necessary for controlling the inverter arm (motor mode). and / or, the arm of the rectifier bridge (generator mode). They allow connection with a signal plate (described later).</li></ul>

0026In a first preferred embodiment, these signal connections 106 comprise a first series of tabs 106a and are aligned on one of the side faces of the triangular housing of the module. Thus, the axes of these signal connection elements 106a are in the same plane P1 perpendicular to the lower face of the module, said plane passing essentially through the axis of rotation AX rotor.

0027This alignment makes it possible to perform linear tongue welds which limits the time of the manufacturing process called "process", and the bulk. This configuration has the advantage of having, for the signal interconnection piece, a signal trace cut out at once, unlike another configuration in which the signal traces overlap. Note that if we shift the tabs towards the inside of the module, ie if the plane does not pass through the axis of rotation, the space for the electronic components 102 is reduced, and conversely, the space for the other modules is reduced.<ul id="ul0011" list-style="bullet"><li>Fastening means 108 represented here by orifices are intended to facilitate the maintenance of the module on the electrical machine by means of studs 113 or screws etc. or any suitable fixing means.</li><li>The positioning means 109 of the module 10 on a dissipator or dissipator bearing are here two in number 109a, 109b as illustrated on the figure. <figref idref="f0002">Fig. 1b</figref> which are on the underside of the module, near two opposite edges. In the example, these are pins located on either side of the electronic elements 102. They are thus spaced as far apart as possible, which makes it possible to limit positioning errors.</li></ul>

0028In addition, preferably, the module 10 further comprises, as illustrated on <figref idref="f0005">Fig. 2a</figref> : <ul id="ul0012" list-style="bullet" compact="compact"><li>Means 107 for protecting the signal connections 106 making it possible to facilitate the positioning of a cover (described below).</li></ul>

0029In addition, preferably, said electronic module 10 further comprises, as illustrated in FIG. the :<ul id="ul0013" list-style="bullet" compact="compact"><li>A phase trace 105 making it possible to connect said module to a phase of the stator.</li></ul>In a preferred embodiment, the phase trace 105 comprises an end 105z which comprises a hook 105cr and allows to connect thereto, by welding, brazing or any other suitable method, a phase wire or a phase tab coming from the stator. of the electric machine. On the example shown in<figref idref="f0001">Fig. 1a</figref>, said end 105z is perpendicular to said trace, ieie to the lower face, and is located below said plane; it stretches down. Thus, this allows a reduction in the length of the phase wire of the stator and involves radial welding. In addition, the 105z end of the phase trace 105 is on the outer circumference of the module which facilitates connection with a phase of the stator. In addition, preferably, the 105z end of the phase trace 105 is placed between two electrical power conductors 103, 104. This optimizes the “wire bounding” electrical wire connections between the transistor electronic components and the traces, in particular their length, and this makes it possible to avoid overlapping traces. In addition, preferably, the end of the phase trace 105 is located in line with a phase output of the stator, which facilitates welding with said phase.

0030In addition, preferably, according to a first variant of this embodiment, said electronic module 10 is a control module 30 which further comprises, as illustrated in <figref idref="f0005">Fig. 2a</figref> and <figref idref="f0006">2b</figref> : <ul id="ul0014" list-style="bullet" compact="compact"><li>A third set of signal tabs</li></ul>106c which are aligned with the outer periphery of the triangular housing of the module, said periphery coinciding with the outer diameter of the machine. This series of tabs allows connection to a signal connector integrated in a cover.<ul id="ul0015" list-style="bullet" compact="compact"><li>A second series of tabs 106b which are aligned parallel to the third series 106c and offset inwardly of the module. This second series of tabs makes it possible to convey complementary signals which could not be integrated into the first series of tabs 106a, for example signals SC for a control element of a switch. This allows the two series of tabs 106b and 106c to be cut out at one time. It will be noted that the third series of tabs 106c is preferably positioned higher than the second series 106b to make it possible to facilitate the welding of a cover to the control module after having carried out the welding of a signal interconnection part.</li></ul>

0031In other words, the second and third series of signal connections 106b, 106c are aligned on the same face on which the ends of the power links are disposed.<ul id="ul0016" list-style="bullet" compact="compact"><li>a housing 112 for stator position sensors.</li></ul>

0032It will be noted that the interconnections between the transistors and the associated traces are made by “wire bounding” connections as illustrated on the figure. <figref idref="f0007">Fig. 2c</figref>. In the context of a module with only one transistor per potential, there is a transistor arranged on the positive trace 103 which is connected to the phase trace 105 and to the ceramic 1110 of the driver 111, while a second transistor is arranged. on phase trace 105 and is connected to negative trace 104 and also to ceramic 1110. Note that we could also have a transistor on negative trace 104. It will be noted that in this example, there are four transistors, two transistors for the “low side” side, indicated LS and “high side”, indicated HS of one arm, ie two transistors per potential to increase the power of the machine. .

0033In addition, preferably, according to a second variant of this embodiment, said electronic module 10 is an excitation module 40, as illustrated on <figref idref="f0008">Fig. 2d</figref>. It comprises electronic components 102, in particular MOS transistors and diodes, which materialize the excitation stage of the rotor of the machine.

0034Thus, the electronic modules 10 have, as regards the arrangement of the traces 103, 104 and of their ends forming electrical conductors inside each module and as regards the arrangement of the signal connections 106, a standardized architecture makes it possible to use said modules on different types of electrical machines. This standardization of the architecture makes it possible to replace any module 10 by a module of the same architecture. In addition, this makes it possible to integrate said modules directly on the rear bearing of the machine. The power and control electronics are thus integrated directly on the machine. The electronics are no longer in an electronic power card in a separate box.

0035Thus, according to the architecture of an electronic module 10 described above, it is possible to have power modules 20 (FIG. 1a to 1c), a control module 30 (<figref idref="f0005 f0006 f0007">Fig. 2a to 2c</figref>) and an excitation module 40 (<figref idref="f0008">Fig. 2d</figref>).

0036In the case of the power modules 20, the electronic components 102, illustrated on <figref idref="f0003">Fig. 1 C</figref>, include for example:<ul id="ul0017" list-style="dash" compact="compact"><li>a set of electronic switches 110 intended to produce a rectifier / inverter bridge arm for a phase of the machine,</li><li>control elements 111 called drivers associated with the switches, and</li><li>a temperature sensor 118 (positioned on a ceramic) of the phase trace 105</li></ul>

0037The switches can be, for example, MOSFET 110 technology transistors which are presented either in the form of packaged components, that is to say presented with a case, or, to increase the compactness of the arrangement of the modules and for reduce costs, in the form of bare chips, that is, without housing. The MOSFETs 110 are controlled by the driving elements 111 commonly called drivers on a ceramic 1110 with additional components. Preferably, the drivers are ASICs. The electronic elements can also be diodes of an arm of a rectifier bridge, knowing that the MOS have a better output than the diodes. The number of electronic components depends essentially on the constraints of the particular application (three-phase or hexaphase machine for example), on the level of power required by the machine, etc.

0038For a three-phase machine, there will preferably be three power modules used to produce an inverter (one module per phase). More generally, the machine is a polyphase machine (x phases), preferably having one module per phase.

0039The <figref idref="f0004">Fig. 1d</figref> illustrates the wire connections commonly called “wire bounding” between the transistors and the power connection 104 and the phase connection 105. It will be noted that in this example, there are four MOS transistors, so as to increase the power of the machine. Of course, there can only be two. It will be noted that the ceramic 1110 thus serves as a support for electronic components but also as an interconnection between the transistors and the driver 111.

0040The control module 30 makes it possible to control the machine and in particular the adjustment of the excitation current of the machine by controlling the drivers of the MOS transistors. It comprises in particular, as illustrated on<figref idref="f0005">Fig. 2a</figref>, an electronic control component 102CTRL, capacitors 102CA, and a transformer 102TR to supply the drivers 111 of the power modules. Control signals will thus be sent from the control component 102CTRL to the drivers 111 of the power modules.

0041The excitation module 40 makes it possible to supply the coil of the rotor of said machine, said module comprising in a conventional manner, MOS transistors and diodes making it possible to determine the current in the rotor.

0042Thus, the control module 30 and the excitation module 40 adopt the architecture of the power modules 10 and in particular the arrangement of the ends of the power traces 103, 104 and of the signal connections 106.

0043According to an alternative embodiment, the control module 30 and the excitation module 40 can be replaced by a common excitation and control module.

0044All of the modules 20, 30 and 40 are mounted on a rear bearing of the rotary electrical machine.

0045<b>In a second non-limiting embodiment,</b> illustrated in the <figref idref="f0009">Fig. 3a</figref>, the electronic module 10 differs from the first mode in that:<ul id="ul0018" list-style="dash" compact="compact"><li>instead of the fixing means 108, it comprises support zones 114 for receiving crutches belonging to a signal interconnection part as will be described below, which makes it possible to eliminate the fixing studs 113 so that the cost of parts and assembly are reduced, and this results in a simpler assembly.</li></ul>

0046The new module 10 can be seen from below at the <figref idref="f0010">Fig. 3b</figref> and in view without overmolding at the <figref idref="f0011">Fig. 3c</figref> for a power module. We will simply note at the<figref idref="f0010">Fig. 3b</figref> that the module preferably comprises a clip 125 for fixing a plastic cover for the module in order to protect the component protection gel. This fixing clip can be replaced by gluing the cover or ultrasonic welding, for example.

0047The <figref idref="f0012">Fig. 3d</figref> presents an alternative embodiment for a 30/40 control / excitation module. It will be noted that the fact of having a single module for the control and excitation function makes it possible to gain in terms of bulk.

0048The <figref idref="f0013">Fig. 3rd</figref> presents the "wire bounding" connections of this variant. It will be noted that there is an interconnection between the control ceramic and the excitation ceramic (substrate) produced by a "wire bounding" wired link in order to allow signal transmission between the excitation part and the control part.

0049In the first two embodiments described, preferably, the ends of said power traces 103, 104 are flat and flush with the underside of said module. Thus, this configuration has the advantage of being able to weld traces of a power plate (described in detail below) on the ends of traces of a module by transparency (flat on flat).

0050<b>In a third non-limiting embodiment,</b> illustrated in the <figref idref="f0014">Fig. 4a</figref>, the electronic module 10 is configured to be fixed on a heat sink, itself fixed on the rear bearing of the machine.

0051It differs from the second embodiment in that:<ul id="ul0019" list-style="dash" compact="compact"><li>the 105z end of the phase trace 105 is perpendicular to the underside of the module, and exceeds the housing 101 of the module and its plastic cover, it extends upwards. Thus, this allows axial welding and thus avoids being hampered by the fixing lugs of the alternator-starter on the engine, whatever the engine of a manufacturer; and this facilitates access to the welding tools,</li><li>the end of the positive trace 103 (B +) is a bent tab allowing radial laser welding with a power plate or axial electric welding by electrodes; it extends axially upwards with respect to the housing 101 of the module and exceeds said housing to engage said electrodes, ie that it is perpendicular to the underside of the module; the tab protrudes from the heat sink. This makes it possible to connect a power interconnection piece 21 with the module from below,</li><li>the end of the negative trace 104 (B-) is no longer a tab, but a hollow cylindrical metal insert allowing an electrical connection to a heat sink 80 via the trace B- and a screw 1150 corresponding to the orifice 115, said screw making it possible to compress said trace on the insert and thus to compress the trace + insert on the heat sink so as to earth the module, said sink being earthed as will be described in detail later,</li><li>The positioning pins 109 located on the lower face are positioned differently. A first pin 109a is positioned closest to the signal tabs 106, and preferably centered on the middle one, to reduce the positioning tolerance of said tabs with respect to the play that may exist between the second pin 109b and the orifice 609b (described in more detail below) corresponding to the dissipating bearing. This reduces the positioning errors of the tabs relative to the heat sink. As shown in<figref idref="f0015">Fig. 4b</figref>, this first pin 109a is located in the middle of the two end tongues 106a of the signal. Note that the first pin 109a is used to position the module along the XY axis, and the second 109b is used to orient the module in rotation and is furthest from the tabs 106a,</li><li>One of the protection pins 107 is moved further out of the module so that there is a bearing space 119 to allow a crutch to be received from a signal plate. The pins 107 prevent the signal tabs 106 from bending between the time of manufacture of the module and its assembly on the machine, and serve as a pre-guide for a signal interconnection piece (described later).</li></ul>

0052Furthermore, the module 10 according to this third mode further comprises:<ul id="ul0020" list-style="dash" compact="compact"><li>An insert 120 comprising a fixing hole 115, said insert allowing grounding of the module, and said hole being intended to fix said module on a heat sink by means of screws 1150 for example,</li><li>Electrical protection means 126 of the end of trace 103 (B +) which prevent a short-circuit between potentials B + (power trace of the power interconnection part) and B- (dissipating ground).</li></ul>

0053A view without overmolding of a power module 20 according to this third embodiment is shown in <figref idref="f0016">Fig. 4c</figref>.

0054A view with the "wire bounding" connections is shown in the <figref idref="f0018">Fig. 4th</figref>.

0055Preferably, each power module 20 comprises a low resistive and thermally conductive plate 1022, preferably in aluminum (same resistance as the heat sink) or even in copper.

0056Thus, we have:<ul id="ul0021" list-style="dash" compact="compact"><li>the electronic components 102 soldered on the metal tracks,</li><li>the metal traces, which are visible on the underside of the module housing, are glued to the plate 1022 by an electrically insulating and thermally conductive glue, for example a glass ball glue, said glue making it possible to electrically isolate the traces between they and the traces in relation to the outside, and</li><li>the plate 1022 which is placed on the heatsink.</li></ul>

0057Plate 1022 is shown on <figref idref="f0017">Fig. 4d</figref> (sectional representation along an AA axis of the <figref idref="f0016">Fig. 4c</figref>). It will be noted that this plate can be used in the same way on the other control or excitation modules within the framework of visible traces.

0058The plate thus makes it possible to test the electrical insulation of each module independently before assembly on the heatsink or heatsink bearing. Thus, if there is a short-circuit problem due to incorrect application of the insulating adhesive, this plate 1022 prevents the rebus of all the modules mounted on the heat sink. Only the problematic module will be discarded before its assembly on the heatsink.

0059According to a variant of this third embodiment, the module 10 comprises, as illustrated on <figref idref="f0019">Fig. 5a</figref> : <ul id="ul0022" list-style="dash" compact="compact"><li>a signal connector 116,</li><li>a screw 117a allowing electrical contact between two traces 117b (+ EX, -EX) of a brush holder 50 and said module 10, and</li><li>a screw 117c for mechanical retention on the dissipator and making it possible to withstand the mechanical forces of the connector 116.</li></ul>

0060More particularly, it is the control module 30 or the control / excitation module which comprises said connector 116 and said screw 117a. It will be noted that the brush holder is here in one piece with said module 30. In fact, it is overmolded with said module.

0061The presence of said signal connector 116 has the advantage of:<ul id="ul0023" list-style="dash" compact="compact"><li>Eliminate welds making it possible to make electrical connections between the cover and the modules, compared to the first embodiment,</li><li>avoid welding and sealing problems,</li><li>save time in the manufacturing process.</li></ul>

0062There are therefore no longer any external tabs 106c as in the first or second embodiments, which makes it possible to reduce the material of the traces (those in the cover) as will be seen below.

0063The <figref idref="f0020">Fig. 5b</figref> is a bottom view of the control module 30 according to this third embodiment.

0064As can be seen, the first positioning pin 109a is as close as possible to the two series of signal tabs 106a and 106b in order to limit the positioning errors of the tabs with respect to the heat sink.

0065In addition we can also see:<ul id="ul0024" list-style="dash" compact="compact"><li>a metal plate 121 fixed by screw 1150, said plate being preferably made of aluminum and thus being grounded dissipator via said screw 1150, said plate comprising substrates 123 of ceramic type on which electronic components are integrated,</li><li>position sensors 122 making it possible to give the position of the stator of the electric machine.</li></ul>

0066The <figref idref="f0021">Fig. 5c</figref> is a top view of the control / excitation module without overmolding, without the connector 116 and without the brush holder 50. The <figref idref="f0022">Fig. 5d</figref> represents the bottom view.

0067The <figref idref="f0023">Fig. 5th</figref> is a first view without pre-molding and without overmolding of the traces of the control / excitation module in which we can see in particular:<ul id="ul0025" list-style="dash" compact="compact"><li>a control ceramic 123 comprising the electronic components for controlling the machine, and</li><li>an excitation part 124 comprising the electronic components for the excitation of the machine via the brush holder 50.</li></ul>

0068We can see the traces of said module also at the Fig. following 5f without pre-molding and without plastic overmolding in view from below.

0069It will be noted that the pre-molding is an operation which is carried out before the overmolding and which makes it possible to hold certain elements in position, such as the signal tabs 106 for example.

0070It will be noted that in all the embodiments, the electronic components 102, in particular the MOS transistors, are mounted on the power links, namely here the positive trace 103 and the phase trace 105.

0071Preferably, in all the embodiments presented above, the power traces of the modules are visible on the underside of the modules. They can thus be electrically isolated from the heat sink or heat sink bearing by glue instead of the plastic of the housing 101. The use of glue instead of the plastic of the housing 101 makes it possible to have a lesser thickness under the modules (approximately 0.2mm in a non-limiting example), and to have a lower thermal resistance than the plastic so as to have better dissipation in the dissipator or dissipator bearing.

0072It will be noted that in all the embodiments presented above, it is of course possible to include or not the signal connector 116 in the control module or control / excitation module if desired. If it is not included, it will be in the hood.

0073It will be noted that the electronic module according to all the embodiments presented above has the following additional advantages:<ul id="ul0026" list-style="dash" compact="compact"><li>it uses bare chips for the electronic components instead of standard so-called packaged components, so as to reduce the bulk,</li><li>it includes the elements used to drive the MOS transistors called drivers,</li><li>a module is configured to fit perfectly on the heatsink or heatsink bearing so that:<ul id="ul0027" list-style="bullet" compact="compact"><li>it does not block the axis of the bearing into which the rotor shaft is inserted,</li><li>there is axial cooling with the attached heatsink (not integrated),</li><li>all the ends of the power and signal traces are outside the circumference of the heatsink or heatsink bearing, which facilitates the connections to be made unlike the case where they are inside said circumference, so as to be accessible and so that there is more room available on the outside than inside diameter for said ends</li></ul></li><li>a module is preferably configured for a single phase so that:<ul id="ul0028" list-style="bullet" compact="compact"><li>the hook of the module is opposite the natural output of a stator phase,</li><li>we have one module per phase. Thus, it is easier to adapt to the space available on the dissipator or dissipator bearing compared to a single module comprising three phase traces, and to do so optimally.</li></ul></li><li>the definition of the module makes it possible to have a power, control and excitation module with the same architecture,</li><li>it makes it possible in the event of soldering failure of one of the transistors to avoid too much rejects compared to a single module for the three phases of the stator.</li></ul>

0074It will be noted that one can also provide a single overmolding for all the power modules 20, the control module 30 and the excitation module 40 or control / excitation module 30/40.

0075At this moment we would have a single module which would include both the power and the control and the excitation, said module then comprising three phase traces.

<u>Other elements</u>

0076An electronic module 10 cooperates with the following elements:<ul id="ul0029" list-style="dash" compact="compact"><li>a dissipator bearing 60 (heatsink integrated into the bearing, ie one-piece with said bearing), or a dissipator 80 (dissipator not integrated into the bearing, ie attached to the bearing)</li><li>a signal interconnect piece 22</li><li>a power interconnection piece 21, and</li><li>a hood 70</li></ul>

0077These elements are described below.

<u>Dissipative bearing</u>

0078The function of a dissipating bearing is to evacuate the heat from the electronic modules.

0079The dissipator rear bearing 60, shown in <figref idref="f0025">Fig. 6</figref> behaves according to <b>a first non-limiting embodiment</b> : <ul id="ul0030" list-style="dash" compact="compact"><li>a plurality of positioning orifices 609, preferably two 609a, 609b per module, to position said modules on said bearing, said orifices being on the same diameter, ie in the example illustrated, ten orifices,</li><li>a plurality of fixing holes 608 to receive the three fixing studs of each module on which the power plate will be positioned, or in the example illustrated, fifteen holes</li><li>air inlets 601 comprising fins 606,</li><li>air outlets 602 comprising fins 606,</li><li>different clearances referenced 603 for the rotor shaft of the rotating electrical machine, 604 for hall effect sensors making it possible to know the rotor position, and 605 for a brush holder 50, and</li><li>positioning orifices 610 for positioning a signal plate, here two orifices 610a and 610b which are distributed on either side of the diameter of the dissipating bearing. Preferably, one of the orifices is the reference control of the dissipator bearing, thus using an already existing orifice.</li></ul>

0080Note that the <figref idref="f0025">Fig. 6</figref> shows the locations of the different modules. Thus, the locations marked P, c, and E respectively receive the three power modules 20, the control module 30 and finally the excitation module 40.

0081According to <b>a second non-limiting preferred embodiment,</b> illustrated in the <figref idref="f0026">Fig. 7</figref>, the dissipating bearing 60 comprises:<ul id="ul0031" list-style="dash" compact="compact"><li>a plurality of fixing holes, here four, 681, 682, 683 and 684 to receive four studs holding the signal plate,</li><li>a fixing hole 685 to receive a fixing screw of a brush holder 50, there is no stud which avoids the reduction of section of the trace B + of a power plate,</li><li>the same following elements as the first embodiment:<ul id="ul0032" list-style="none" compact="compact"><li>▪ air inlets 601 comprising fins 66,</li><li>▪ air outlets 602 comprising fins 606,</li><li>▪ different clearances 603, 604 and 605, and</li><li>▪ the positioning holes 610a and 610b on the signal plate.</li></ul></li></ul>

0082It will be noted that the control and excitation functions have been combined in a single control / excitation module. Furthermore, note the location C / E and P respectively of the control / excitation module and of the power modules 20 on the<figref idref="f0026">Fig. 7</figref>.

0083It will also be noted that the fins 606 can, in a manner known to those skilled in the art, be replaced by a liquid cooling circuit for the two embodiments of the dissipator bearing described above.

<u>Heat sink</u>

0084The function of the heat sink is to evacuate the heat from the electronic modules.

0085The heatsink 80 as illustrated in top view of the <figref idref="f0027">Fig. 8a</figref> is independent of the rear bearing of the rotating machine.

0086It comprises according to a preferred non-limiting embodiment:<ul id="ul0033" list-style="dash" compact="compact"><li>a base plate 801 preferably in foundry aluminum, and</li><li>fixing holes 806 on the rear bearing of the machine, here four, to receive fixing studs for a signal plate,</li><li>an electrical connection hole 805 to connect the heat sink to ground via the power interconnection plate by means of a nut,</li><li>fixing holes 804 to fix the modules, here four, and connect them to the dissipator ground via an insert,</li><li>a fixing hole 807 for fixing a signal connector of the control / excitation module via an insert,</li><li>mechanical positioning holes 808 for positioning a power plate 21, here two distributed on either side of the diameter of the heat sink,</li><li>recesses 809 on the circumference to receive electrical protection means, here three, for the positive trace (B +) of the power interconnection part,</li><li>positioning holes 810 for the modules, here two per module, i.e. 8 holes,</li><li>mechanical positioning holes 811 for positioning a signal plate 22, here two distributed on either side of the diameter of the heat sink, and</li><li>recesses 812 for inserting phase housings of a power plate as will be seen in detail later. So there are three here,</li><li>clearances 815, 816, 817 for respectively receiving a brush holder, position sensors, and the rotor shaft.</li></ul>

0087Note the locations C / E and P respectively of the control / excitation module and of the power modules 20.

0088The <figref idref="f0028">Fig. 8b</figref> shows a top view of the heatsink. We can see that the heatsink also includes:<ul id="ul0034" list-style="dash" compact="compact"><li>cooling fin blocks 802 intended to substantially increase the heat dissipation of the power modules 20, said blocks being located on the underside in the position of use of the base plate 801,</li><li>Support zones 814 to receive the crutches for constraining the power interconnection part which make it possible to withstand engine vibrations,</li><li>A boss 813 which makes it possible to guide the air from the radial inlet of the machine towards the interior of said machine and thus prevents the air from stagnating at the level of the dissipator. This is also the case for axial air. It is guided towards the interior of the machine. It will be noted that the fins at this level pass through said boss 813. We can see a section XX of the boss on the<figref idref="f0029">Fig. 8c</figref>.</li></ul>

0089Furthermore, it will be noted that the base plate 801 is configured on the one hand to be able to be assembled in sandwich between, a power interconnection plate and the modules, and a signal interconnection plate, and on the other hand to leave a sufficiently large passage in the center for the cooling air of the electrical machine.

0090As shown on the <figref idref="f0030">Fig. 8d</figref>, a first flow of air will enter the machine thus axially FA. This has the advantage of increasing the speed of the air and thus of reducing the pressure drops with respect to a radial flow (case of the first and second embodiments of the dissipating bearing described above).

0091In this way, re-looping of air heated by the machine is avoided between an outlet and an inlet of the dissipating bearing (for the air entering axially) and thus avoiding reinjecting hot air into the machine.

0092More particularly, it is the spacing 817 which is configured so as to allow air to pass around the rotor shaft and is therefore larger than the diameter of the rotor shaft or to be more precise of the manifold protector. of the tree.

0093This brings us closer to the standard cooling applied to a conventional alternator.

0094Furthermore, the axial air flow is guided by the first slope 813P1 of the boss 813 of the heat sink so that there is no stagnant air on the underside of the heat sink at the level of the fins.

0095In addition, thanks to the positioning of the heat sink described, there is also a second air flow which is radial between the heat sink 80 and the power interconnection part 21. It can also be seen on the figure. <figref idref="f0030">Fig. 8d</figref>. This radial air FR enters through the dissipator and leaves through the openings 606 of the bearing. This radial air flow increases the air flow and therefore improves the cooling of the machine, the latter being thus more efficient than if there were only an axial air flow.

0096In addition, thanks to the boss 813 located at the level of the fins, this radial air flow does not stagnate because it is guided by the second slope 813P2 of said boss 813 towards the interior of the machine.

0097It will be noted that these radial air flows FR and axial FA are accelerated by the fan of the machine, which results in better cooling of the machine plus the electronics due in particular to the arrangement of the heat sink as described above.

<u>Signal interconnection plate</u>

0098The signal interconnection plate 22 is intended to convey various signals necessary for the operation of the modules and, thereby, for the correct operation of the rotating electrical machine. Such signals are for example:<ul id="ul0035" list-style="dash" compact="compact"><li>an operating mode signal of the electrical machine, for example motor or generator,</li><li>a signal indicating the temperature of the modules,</li><li>a signal reporting a fault detected on the modules,</li><li>a control signal from the MOS switches etc.</li></ul>

0099These signals are conveyed between the power modules 20 and the control module 30.

0100The <figref idref="f0031 f0032 f0033">Fig. 9a to 9c</figref> represent <b>a first non-limiting embodiment</b> of the signal interconnect piece 22.

0101She understands :<ul id="ul0036" list-style="dash" compact="compact"><li>a base plate 220 of insulating material, preferably of plastic, and preferably substantially cylindrical, which molds metal traces of signal TS,</li><li>a central recess 223 to lighten said material plate,</li><li>recesses 221a to leave visible metal traces TS, said traces comprising interconnection orifices 2210, here five orifices, the axes of which are arranged in a plane P2 (shown in <figref idref="f0033">Fig. 9c</figref>) perpendicular to the surface of the plate and passing substantially through the rotor axis of rotation AX, said orifices being intended to receive the signal tabs 106 of an electronic module in order to be electrically connected,</li><li>a connection recess 221b for leaving visible metal traces TS, said traces comprising interconnection holes 2211, arranged along the outer periphery of said plate 22, said holes being intended to receive the signal tabs 106 of a control module , here three orifices, and</li><li>fixing lugs 222 intended to be inserted into one of the three retaining studs 113 of an electronic module, and intended to receive a fixing nut, said fixing lugs making it possible to hold the signal interconnection plate 22 on the modules, via the studs, of the first tabs 222a being arranged on the external diameter of said plate and projecting from said plate, and second legs 222b being disposed on the internal diameter of said plate and further attenuating vibrations of the plate.</li></ul>

0102It will be noted that the recesses 221a and 221b can subsequently be protected against the external environment by a resin for example.

0103It will also be noted that the overmolding 220 comprises orifices 2210z, 2211z facing the orifices of the metal traces TS as illustrated on <figref idref="f0032">Fig. 9b</figref>.

0104The signal plate 22 further comprises:<ul id="ul0037" list-style="dash" compact="compact"><li>positioning pins 224 for assembly on a dissipating bearing 60, here two as illustrated in the view from below of the <figref idref="f0032">Fig. 9b</figref>, and</li><li>metal traces of TS signal configured to match the shape of the plate and the position of the tabs 106 of the modules, and having interconnection holes 2210, 2211 as shown in the figure <figref idref="f0033">Fig. 9c</figref>. said traces are preferably in the same plane. Furthermore, they are preferably configured in the form of arcs of a circle which are essentially concentric with respect to the axis of rotation of the rotor.</li></ul>

0105The <figref idref="f0034 f0035 f0036">Fig. 10a to 10c</figref> represent <b>a second preferred embodiment</b> of the signal interconnect piece 22.

0106This signal interconnection plate 22 comprises:<ul id="ul0038" list-style="dash" compact="compact"><li>instead of the fixing lugs of the first mode, crutches 225 making it possible to press the modules against a dissipating bearing, the first crutches 225a and second crutches 225b being positioned respectively on the outer or inner periphery of said plate, here nine in total ; there are thus three support points on each module,</li><li>instead of the three recesses per module, only three bearing inserts 226 intended to receive three studs 226g, for fixing on the dissipator bearing 60, and</li><li>a metal insert 226 to receive a screw 226v making it possible to fix the plate on the dissipator bearing. This screw avoids reducing the section of the positive power traces (B +) of the power interconnection part 21 (described later).</li></ul>

0107These four inserts also prevent creep of the plastic from the overmolding. They can therefore also be used for the first embodiment.

0108Plate 22 further includes:<ul id="ul0039" list-style="dash" compact="compact"><li>at least one fixing housing 227 for fixing the power interconnection piece 21 and receiving a fixing clip (218), here two housings, and</li><li>an additional central recess 228 to receive a brush holder.</li></ul>

0109In a first variant embodiment of this embodiment, the plate further comprises separators 229 of signal tabs 106 so as to avoid short circuits between said tabs, short circuits due in particular to salt spray. Thus, the length of the electrical path between the tongues is increased.

0110In another variant, said plate does not include separators. At this time, to isolate said tabs from each other, seals are provided which surround said tabs 106 on the modules themselves. Subsequently, the signal plate 22 will compress these seals.

0111It will be noted that these two variants apply to the two embodiments of the electronic module described above as well as to the third embodiment which will be described below.

0112On the <figref idref="f0036">Fig. 10c</figref>, one can see the concentric metal traces of the signal plate 22. Said metal traces are configured to adapt to the position of the tabs 106 of the modules, and preferably to the shape of said plate, and moreover to bypass the four inserts 226. They are preferably configured in the form of arcs of a circle which are essentially concentric with respect to the rotor axis of rotation.

0113It will be noted that the crutches 225 are, in a nonlimiting manner, of cylindrical shape. This shape has a sharp edge 2250.

0114Furthermore, it will be noted that the interconnection plate 22 according to this second mode has the same following elements as the plate according to the first mode:<ul id="ul0040" list-style="dash" compact="compact"><li>the base plate 220,</li><li>the recesses 221a and 221b,</li><li>the central recess 223 intended here to receive a rotor shaft,</li><li>the positioning pins 224, and</li><li>the metal tracks TS with orifices 2210 and 2211.</li></ul>

0115It will be noted that, for the first and second embodiments described above, the signal traces are preferably configured inside the diameter on which the power terminals are made (described in detail below). This allows the power plate 21 (described later) to cover the signal plate 22. Thus, assembly is facilitated and said signal traces do not interfere with the power traces.

0116The <figref idref="f0037 f0038 f0039 f0040">Fig. 11a to 11d</figref> represent <b>a third non-limiting embodiment</b> of the signal interconnect piece 22.

0117It differs from the second embodiment in that:<ul id="ul0041" list-style="dash" compact="compact"><li>it no longer has fixing housings 227 for positioning the power interconnection part 21 because in this mode, the power plate 21 is located below the signal plate 22 as will be seen in detail below.</li><li>the crutches 225a and 225b have a different shape. They have a shape which no longer has a sharp edge, which prevents the stresses to which the plastic is subjected to concentrate on the sharp edges. This reduces the risk of breaking said crutches.</li></ul>

0118Said signal plate 22 further comprises:<ul id="ul0042" list-style="dash" compact="compact"><li>recessed protuberances 230 to preposition said plate on said modules. Here there are two protrusions. They are used in particular for pre-guiding during process assembly. This thus makes it possible to subsequently fix the positioning pins 224 of said plate 22 in the heat sink 80. It will thus be possible to position the signal plate 22 before the assembly of the signal tabs 106, and</li><li>housing 231 to house filtering capacities. These capacities will be connected to the electronic modules. The housings allow good mechanical strength of said capacities. Resin will be deposited in said housings.</li></ul>

0119Furthermore, it will be noted that the interconnection plate 22 according to this third mode has the same following elements as the plate according to the second mode:<ul id="ul0043" list-style="dash" compact="compact"><li>the base plate 220,</li><li>the recesses 221a and 221b,</li><li>the central recess 223,</li><li>the recess 228 for the brush holder,</li><li>the four inserts 226,</li><li>the positioning pins 224, and</li><li>the metal tracks TS with orifices 2210 and 2211.</li></ul>

0120According to a first variant of this mode, the orifices 2210 and 2211 are configured so as to perform a tin solder between said orifices and the corresponding signal tabs 106. These are therefore holes with chamfer as illustrated on the<figref idref="f0037">Fig. 11a</figref> and at the <figref idref="f0038">Fig. 11b</figref> in view from below.

0121According to a second variant of this mode, the orifices 2210 and 2211 are configured so as to perform a laser welding between said orifices and the corresponding signal tabs 106. They are therefore folded micro-tabs as illustrated on the<figref idref="f0039">Fig. 11c</figref>.

0122On the <figref idref="f0040">Fig. 11d</figref>, we can see the metal traces of the signal plate 22. Said metal traces are configured to adapt to the position of the tabs 106 of the modules, and preferably to the shape of said plate, and moreover to bypass the four inserts 226 They are preferably configured in the form of arcs of a circle which are essentially concentric with respect to the rotor axis of rotation.

0123Thus, unlike an electronic card performing the signal function, such a signal plate has the advantages of:<ul id="ul0044" list-style="dash" compact="compact"><li>withstand high temperatures, for example 260 ° C., unlike a conventional electronic PCB, such a PCB being composed of traces of copper with a polymer insulator, said traces of copper not withstanding high temperatures.</li><li>be able to be centered above the electronic modules 10,</li><li>include traces of metal not necessarily copper. In fact, due to the relatively low power conveyed by these traces, there is not necessarily a need for a material with low electrical resistance. Thus, said traces may for example be, in a nonlimiting manner, made of steel,</li><li>be as close as possible to the modules which avoids having signal tabs for the modules that are too long and thus avoids plugging problems,</li><li>thanks to the metallic traces which do not overlap, a trace cutting is obtained in one go, a thin thickness of the plate is obtained, hence a gain in axial size of the whole of the machine, and a manufacturing of the facilitated signal interconnection plate.</li></ul>

0124It will be noted that of course, in all the embodiments presented above, it is also possible to provide instead of the interconnection orifices 2210, 2211 other interconnection means such as folded tabs for example.

<u>Power interconnection plate</u>

0125The power interconnection part 21 makes it possible to distribute the power between the electronic modules 20, 30, 40 from the outside (in particular the vehicle battery).

0126This part is independent of the electronic modules, which makes it possible to supply each module with current independently and thus avoids overheating of the modules linked to the flow of current intended for one module in all the modules. Thus, depending on the configuration of this part and of the associated modules, there is no current flow between the three power modules.

0127The interconnection piece 21 is, in the simplest case, in the form of a plate made of an electrically insulating material, preferably plastic.

0128<b>In a first non-limiting embodiment,</b> illustrated at <figref idref="f0041 f0042 f0043">Fig. 12a to 12c</figref>, it involves :<ul id="ul0045" list-style="dash" compact="compact"><li>a central recess 210 to lighten said material plate,</li><li>power interconnection traces 211 (-BATT), 212 (+ BATT),</li><li>negative 2110 and positive 2120 power terminals from the respective power traces 211, 212,</li><li>a plastic overmolding 213 on said interconnection traces 211 and 212,</li><li>a first recess 214a,</li><li>a second recess 214b, and</li><li>fixing brackets 215.</li></ul>

0129The elements of the power interconnection plate are described in detail below.<ul id="ul0046" list-style="bullet" compact="compact"><li>The power interconnection traces 211, 212 are disposed at least on one side of the plate. These are traces of a low resistive metal, preferably copper, which are molded into the plastic material of the power plate 21.</li></ul>They can be produced in the form of flat strips clipped, riveted, glued or fixed in any other suitable manner on the plastic plate. According to a preferred embodiment, the traces 211, 212 are nested (the trace 211 is surrounded by the trace 212) and concentric and on the same plane. In this case, the negative power terminals 2110 are bent so as not to interfere with the positive interconnect trace 212 (+ BATT). In this way, the location of the recesses 214a, 214b can be optimized to orient a cover according to the need for a customer connector which makes the connection of the machine with the outside. Said traces 211 and 212 do not overlap so as to allow an electrical connection with the traces of such a cover, said zone comprising the recesses 214a and 214b.

0130According to a second embodiment, the traces 211, 212 can be superimposed on one another. This promotes radial bulk. Finally, it will be noted that each of the power interconnection traces 211, 212 comprises a hole 217a, 217b making it possible to position said trace in x, y in a mold, the latter making it possible to carry out the plastic overmolding 213.<ul id="ul0047" list-style="bullet"><li>The power interconnect traces 211, 212 show negative power terminals 2110 (-BATT) in an L-shape, and positive 2120 (+ BATT), respectively. Said terminals extend radially towards the outer periphery of said part 21. These terminals have curved free ends. The precise dimensions and position of the terminals 2110, 2120 are determined so as to allow them to be positioned above the ends of traces 104, 103 of each of the modules so as to be able to be connected to said traces by means of a solder, d 'brazing or soldering for example. This configuration of the power terminals (L-shaped and having ends curved by bending) on ​​the outside diameter thus facilitates assembly with the modules. These terminals thus make it possible to obtain an electrical connection with the corresponding traces 103, 104 of the electronic modules 10 so that the electrical power is distributed in each of said modules. Note that the positive power trace 212 overlaps the negative interconnect terminals 2110.</li><li>The overmolding 213 comprises a first recess 214a for an electrical connection of the interconnection trace 211, by laser welding preferably, with a cover towards the battery, and a second recess 214b in said overmolding for an electrical connection of the trace of. interconnection 212, preferably by laser welding, with a cover towards the battery.</li></ul>

0131Furthermore, the overmolding 213 comprises assembly recesses 216 allowing an assembly tool to pass through said plate and to assemble the rear dissipator bearing with a front bearing. It will be noted that the ends of the power terminals 2110 and 2120 are not overmolded so that said ends can rest on the ends of the tracks 104, 103 of the modules. Preferably, the entire power terminal part is not overmolded so that assembly on the ends of the tracks is facilitated. Indeed, this brings more bending in such an assembly.<ul id="ul0048" list-style="bullet" compact="compact"><li>The tabs 215 extend substantially radially over the outer periphery of the interconnection plate. Each of the tabs 215 is provided with an orifice allowing the passage, during the assembly of the various modules and other elements of the arrangement, of fixing means such as threaded rods or bolts or dowels or any other element. appropriate fixing.</li></ul>

0132<b>In a second non-limiting embodiment,</b> illustrated at <figref idref="f0044 f0045 f0046">Fig. 13a to 13c</figref>, the power interconnection plate 21 comprises:<ul id="ul0049" list-style="dash" compact="compact"><li>an additional central recess 2101,</li><li>at least one fixing clip 218,</li><li>inserts 219a, 219b to receive retaining studs,</li><li>a mechanical stop 2112,</li><li>at least one support pin 2113, and</li><li>an orifice 219c.</li></ul>

0133The elements of the power interconnection plate are described in detail below.<ul id="ul0050" list-style="bullet" compact="compact"><li>the additional central recess 2101 allows the insertion of the brush holder with its protector. In this case, the brush cage protector is an independent part assembled on the brush holder, and the brush holder can be removable from the control / excitation module, which facilitates maintenance of the machine, in particular with a view to retrofitting, that is to say when we change the brushes (and therefore the brush holder) when they are worn. Thus, instead of changing all the electronics (the modules and the two plates), only the brush holder will be changed (if the electronics are not faulty).</li><li>the fixing clips 218 allow a mechanical holding of the plate 21 on the signal plate 22, here three,</li><li>The inserts 219a and 219b for receiving retaining studs, here two in total, and for connecting the power traces 211, 212 to a cover 70. The two inserts 219a, 219b provide access to said power traces so that ' an overmolding 213 can be carried out on said traces as illustrated on the <figref idref="f0044">Fig. 13a</figref>. These two inserts thus allow a mechanical strength of the plate 21 and an electrical connection.</li><li>The last orifice 219c only allows a mechanical strength of said plate 21 via a stud.</li><li>The mechanical stop 2112 makes it possible to stop the power plate 21 in translation when it is assembled. It is supported, for example, on the control / excitation module. Furthermore, this stop has a length shorter than the power terminals 2110 and 2120 of the power traces so that said terminals bear on the traces of the corresponding modules before the stop presses on the control module. The stop is placed on the outside diameter of the plate and protrudes from this plate.</li><li>the bearing pins 2113, here two, allow said plate 21 to press on the dissipator bearing during assembly.</li></ul>

0134The plate 21 comprises, as described in the first embodiment:<ul id="ul0051" list-style="dash" compact="compact"><li>the central recess 210,</li><li>traces of power 211, 212,</li><li>negative 2110 and positive 2120 power terminals, and</li><li>overmolding 213.</li></ul>

0135It will be noted that the overmolding 213 comprises here a clearance 2130 making it possible to lighten the plastic material, said clearance being possible because there are no traces of power opposite. In the same way as in the first embodiment, the power terminals 2110 and 2120 are not overmolded.

0136The power traces 211 and 212 are shown on the <figref idref="f0046">Fig. 13c</figref>.

0137Furthermore, according to the first and second embodiments:<ul id="ul0052" list-style="dash" compact="compact"><li>the plate 21 can also integrate passive filtering components 2114 shown in <figref idref="f0045">Fig. 13b</figref>, for example capacitors connected between the power traces 211 (-BATT), 212 (+ BATT) via micro-tabs 21140a and 21140b. This makes it possible, for example, to filter the voltage of the on-board network of the motor vehicle, and in particular to filter oscillations due to MOS electrical conversion components, diodes, etc.</li><li>preferably, the ends of the power traces are flat and flush with the surface of the module. Thus, this configuration has the advantage of being able to weld traces of a power plate (described in detail later) on the ends of the traces of a module by transparency flat on flat,</li><li>the power interconnection plate 21 can also incorporate a brush cage protector (not shown) which makes it possible to seal the brush holder. This makes it possible to have one less part to assemble. The brush holder supplies the excitation current from the excitation module to the rotor via brushes. Said protector then comprises positioning guides which will make it possible to position said protector opposite the brush holder,</li><li>preferably, the positive terminals 2120 are rigid lugs defining a reference bearing plane for said power piece on the corresponding traces of the modules,</li><li>preferably, the negative power terminals 2110 are flexible lugs to take into account assembly tolerances. Thus, when assembling the modules and said plate, this will make it possible to deform the traces of said power plate before transparency welding. This thus facilitates contacting the traces of the power interconnection with the corresponding traces of the modules. This flexibility can also be used for the first embodiment, also for the third embodiment described below (although this is not necessary).</li></ul>

0138The <figref idref="f0047 f0048 f0049 f0050 f0051">Fig. 14a to 14th</figref> represent <b>a third embodiment</b> no <b>limiting</b> of the power interconnection piece 21.

0139The power interconnection plate 21 comprises:<ul id="ul0053" list-style="dash" compact="compact"><li>210d inserts to establish a mechanical connection with the rear bearing of the machine,</li><li>stator phase protection means 211d,</li><li>positioning means 212d on the rear bearing of the machine,</li><li>restraint crutches 213d</li><li>positioning means 214d of said plate in the heat sink 80,</li><li>a fixing terminal 215d making it possible to fix said plate on the heat sink 80,</li><li>a 216d electric insert,</li><li>a 219d power connector</li><li>positive 221d (B +) and negative 222d (B-) traces overmolded in plastic,</li><li>positive power terminals 217d from the positive trace B +,</li><li>means of protection 218d of the positive power terminals 217d,</li><li>a terminal 220d for mechanical connection to a customer power connector (not shown) connected to the battery, and</li><li>a mechanical connection hole 220e connected to the connection terminal 220d.</li></ul>

0140The elements of the power interconnection plate are described in detail below.<ul id="ul0054" list-style="bullet" compact="compact"><li>The 210d inserts to establish a mechanical connection with the rear bearing of the machine, by means of screws for example, here in total four,</li><li>the stator phase protection means 211d are located on the outside diameter of said plate and projecting beyond the plane of said plate, said means avoiding contact between a stator phase and the dissipating mass or bearing mass in particular,</li><li>the positioning means 212d on the rear bearing of the machine, said means here being a positioning pin, extend over the underside of the plate, said pin advantageously positioning itself in an oblong hole which is the reference orifice d machining of the bearing,</li><li>the stress legs 213d allow an axial deformation downwards of said power plate to avoid vibration problems, said legs preferably being of greater height than the inserts 210d to be sure of deforming the plate, said legs extending over the upper face of the plate,</li><li>the positioning means 214d of said plate in the heat sink 80, here two, extend over the upper face of said plate,</li><li>the fixing terminal 215d makes it possible to fix said plate on the heat sink 80 by means of a nut, and is connected to the negative power trace B-, which achieves a grounding of the heat sink,</li><li>the electric insert 216d is intended to be assembled with the terminal 215d on the trace 222d, said trace thus being sandwiched by said insert and said terminal, which thus avoids a soldering which is difficult to achieve between the dissipator, which is preferably foundry aluminum and copper power trace,</li><li>the power connector 219d has a negative trace B- and a positive trace B +,</li><li>the electrical power terminals 217d resulting from a positive trace B +, are here L-shaped and have an axial tab, ie perpendicular to the plane of said plate 21 and protruding from said plane upwards; said terminals are not overmolded to allow connection with the end of the positive trace 103 (B +) of an electronic module, the terminals extend towards the outer periphery of said part 22,</li><li>the means of protection 218d of the electrical terminals 217d protect against short circuits and salt spray in particular,</li><li>the positive 221d (B +) and negative 222d (B-) traces are overmolded in plastic 213 for example, traces that can be seen at the <figref idref="f0049">Fig. 14c</figref>. The traces are visible on the power connector 219d which allows the installation of the customer power connector to make the electrical connections between said connector and said traces,</li><li>the terminal 220d for connection to the customer connector connected to the battery, said terminal making it possible to apply pressure between the traces 221d and 222d and the traces of the customer power connector so that the current can be established correctly between the battery and the machine, and</li><li>a mechanical connection hole 220e for a screw, thus avoiding the transmission of mechanical stresses to the overmolding when the customer power connector is fixed on the connection terminal 220d.</li></ul>

0141Preferably, in an alternative embodiment, as shown in <figref idref="f0051">Fig. 14th</figref>, the overmolding 213 of the power plate 21 covers the openings of the air outlets of the bearing (up to the outer diameter of the bearing) so as to guide the air at the outlet to reduce radial re-looping of the air towards the inside the machine. Thus, said overmolding comprises a covering collar 213z shown in<figref idref="f0051">Fig. 14th</figref>.

0142Thus, the power plate has the advantages of:<ul id="ul0055" list-style="dash" compact="compact"><li>have a single trace without overlapping, said trace allowing easier molding and positioning,</li><li>to be fixed under the dissipator 80 and therefore to be separated by a ground from the signal interconnection plate 22, so that the power signal B + does not disturb the signals of said signal interconnection plate 22.</li><li>A gain in axial size since the power plate 21 is placed in the space required for the fins of the heat sink,</li><li>Allow the dissipator to be mass-insulated (relative to that of the bearing) or not, therefore a different mass from that of the bearing, thus avoiding disturbances to the on-board network during start-up in particular.</li></ul>

0143It will be noted that thanks to the presence of the power plate 21, there is a large section of copper to convey the power necessary for the operation of the machine (150A in alternator mode, 600A at start-up) unlike a solution in which the traces of power are integrated in a belt also comprising the electronic power modules.

<u>Hood</u>

0144<b>According to a first non-limiting embodiment,</b> the cover 70 as illustrated in <figref idref="f0052 f0053 f0054">Fig. 15a to 15c</figref> comprises:<ul id="ul0056" list-style="dash" compact="compact"><li>traces of power 71 positive (B +), and negative 72 (B-),</li><li>two openings 74 for making welds of the traces 71, 72 with the corresponding traces of the power plate 21,</li><li>signal traces 75 allowing a link between the modules and a signal connection 76,</li><li>a signal connector 76,</li><li>grooves or orifices to uncover 77, and</li><li>fixing holes 78 for fixing screws or nuts for example.</li></ul>

0145The elements of the cover are described in detail below.<ul id="ul0057" list-style="bullet" compact="compact"><li>The power traces 71, 72 are intended to electrically connect the power traces 212, 211 of the power interconnection part 21 ensuring the connection with the customer power connector of the motor vehicle. The power traces 71, 72 are molded into the cover 70 and laser welded to the two traces 212, 211 of the interconnection part 21. The electrical connections made between these two elements, for example through the opening 74 provided. for this purpose. The electrical connections can be made by welding, in particular by laser welding or brazing welding, as well as by brazing or by mechanical contact. In the latter case, the mechanical contact is obtained for example by fixing screws of the cover 70 exerting pressure on the tracks.</li><li>The signal connector 76 allows dialogue with the other electronic units of the vehicle. This connection comprises signal traces 75 integrated into the cover 70 and connected on one side to the control module 30 and on the other end to the customer signal connector (not shown). Said customer signal connector comprises a connecting cable to a control means such as, for example, a computer controlling various functions of the vehicle such as, for example, the management of the rotating electric machine according to its functions of generator or engine.</li><li>The grooves or orifices for uncovering 77 make it possible to position the cover 70 correctly on the guides 107 of the control module 30. Said grooves or orifices thus cooperate with guides 107 of the control module 30.</li></ul>

0146<b>According to a second non-limiting preferred embodiment,</b> illustrated in the <figref idref="f0055">Fig. 16</figref>, the cover comprises:<ul id="ul0058" list-style="dash" compact="compact"><li>openings 79 intended to receive fixing means such as studs in place of screws.</li></ul>

0147It further comprises the following elements described in the first embodiment.<ul id="ul0059" list-style="dash" compact="compact"><li>traces of power 71, 72,</li><li>the connection element 73 to the on-board power supply,</li><li>the two openings 74,</li><li>signal interconnection 75,</li><li>the signal connector 76, and</li><li>grooves or orifices to deceive 77.</li></ul>

0148Note that the cover 70 as described in the two modes is intended to be a specific part for each customer due to the specific location and type of the customer connector (s) used.

0149<b>According to a third non-limiting preferred embodiment,</b> illustrated in the <figref idref="f0056">Fig. 17a</figref> and <figref idref="f0057">17b</figref>, the cover is a simple cover which only comprises fixing clips 791 of the cover which plug into studs 226g of the signal plate 22 fixing the assembly. It no longer has any trace or connector. There is only plastic.

0150After having seen all the elements which cooperate with the electronic modules, we describe their assembly below.

0151As will be seen in detail below, the electronic modules are fixed to the rear bearing of the machine in several ways:<ul id="ul0060" list-style="dash" compact="compact"><li>Either on the bearing directly (dissipating finned or water bearing whether or not incorporating heat pipes),</li><li>or on a non-integrated heat sink (finned or water-based or not including heat pipes).</li></ul>

<u>1) 1</u>^<u>er</u><u>assembly method or arrangement</u>

0152According to a first mode of assembly of the modules, an electronic module interfaces with the following elements:<ul id="ul0061" list-style="dash" compact="compact"><li>a dissipator bearing 60,</li><li>a signal interconnection piece 22 according to the first or second embodiments</li><li>a power interconnection piece 21 according to the first or second embodiments</li><li>a cover 70 according to the first or second embodiments.</li></ul>

0153Thus, the 1^er assembly mode of all the parts described above is carried out as follows.

0154<b>In a first step 1)</b>, the electronic module (s) are mounted on the dissipator bearing 60.

0155The positioning of each module on the dissipating bearing 60 is facilitated by the two positioning pins 109a, 109b which will be found opposite each orifice 609a, 609b of the corresponding bearing 60.

0156The modules are attached to the dissipator bearing 60 on the one hand by means of an adhesive, for example glass beads, and on the other hand mechanically in two different ways.

0157<b>According to a first non-limiting manner,</b> illustrated on the <figref idref="f0058">Fig. 18</figref>, each of the modules is fixed by three studs 113. The three studs will fit into the corresponding holes 608 of said bearing. The<figref idref="f0058">Fig. 18</figref> shows the assembly of five modules, three power modules 20, a control module 30 and an excitation module 40.

0158<b>According to a second, non-limiting, preferential manner,</b> illustrated at <figref idref="f0064">Fig. 24</figref>, the fixing is carried out by means of:<ul id="ul0062" list-style="dash" compact="compact"><li>three studs 226g which are fitted after installing the signal interconnection plate 22, and which fit into the corresponding holes 681, 682, 683 of the heat sink 60, and</li><li>a screw 226v which fits into the associated hole 684 of the bearing.</li></ul>

0159The <figref idref="f0063">Fig. 23</figref> represents the assembly of four modules, three power modules 10, a control / excitation module.

0160For both ways, all the modules are preferably arranged in the same plane perpendicular to the axis of rotation of the rotor of the electric machine, like the power traces and the signal connections, in order to facilitate their assembly.

0161However, as an alternative to what is shown in Figs. above, the modules can be arranged on different planes.

0162<b>In a second step 2),</b> the signal interconnection plate 22 is mounted on the electronic modules. Therefore, said plate is as close as possible to the modules to reduce the length of the signal connections as much as possible and to avoid plugging problems. In this way, the signal connections 106 of the modules are short; their deformation is thus controlled more (they are less deformable), said connections preferably being flexible.

0163The signal interconnection plate 22 is attached to the module-bearing assembly in two different ways corresponding to the two ways of fixing the modules to the bearing as previously described.

0164<b>According to a first non-limiting manner,</b> illustrated at <figref idref="f0059">Fig. 19</figref>, the plate 22 is positioned by means of the positioning pins 224 which are positioned opposite the positioning orifices 610a and 610b of the bearing. Thus, thanks to this positioning:<ul id="ul0063" list-style="dash" compact="compact"><li>the connection recesses 221a are placed opposite the signal connection elements 106a of the modules,</li><li>the connection recesses 221b are placed opposite the signal connection elements 106b of the modules, and</li><li>the fixing brackets 222 are placed opposite the studs 113 of the modules 10.</li></ul>

0165Then, after pressing, the signal connections 106a fit into the interconnection holes 2210 of the TS signal metal tracks, the connection elements 106b fit into the interconnection holes 2211 of the TS signal metal tracks, and the tabs 222 are fixed on the studs 113.

0166<b>According to a second, non-limiting, preferential manner,</b> illustrated at <figref idref="f0064">Fig. 24</figref>, the plate 22 is positioned on the modules by means of the positioning pins 224 which are positioned opposite the positioning orifices 610a and 610b of the bearing. Thus, thanks to this positioning:<ul id="ul0064" list-style="dash" compact="compact"><li>the connection recesses 221a are placed opposite the signal connection elements 106a of the modules,</li><li>the connection recesses 221b are placed opposite the signal connection elements 106b of the modules,</li><li>the crutches 225a and 225b are placed opposite the support zones 114 of the modules, and</li><li>the inserts 226 are placed opposite the corresponding orifices 681 to 684 of the bearing.</li></ul>

0167Then, after pressure, the connection elements 106 are inserted into said corresponding recesses 221, the crutches 225 are supported on the bearing zones 114 of the modules.

0168The studs 226g which fit into the orifices 224 of said plate 22 and 681, 682, 683 of the dissipating bearing 60 are then fixed. The studs press on said plate and therefore on the plate-modules-bearing assembly so as to allow better mechanical resistance. In the same way, the screw 226v is screwed into the respective corresponding holes 226 and 684 of the plate 22 and of the bearing 60.

0169Thus, the signal interconnection plate 22 is made so as to exert pressure on the power modules 20 and the other modules 30, 40 in order to guarantee their maintenance throughout the life of the rotating electrical machine.

0170In a non-limiting embodiment, the material of said plate is PPS (phenylene polysulphide) plastic filled with glass fibers.

0171Thus, in these two ways, the signal plate is deformed to exert pressure on the modules, the deformation preferably being about 0.3mm. In this way, the modules are prevented from peeling off and stress on the welds of the tabs is avoided.

0172<b>In a third step 3),</b> the power interconnection plate 21 is mounted on the bearing-modules-signal plate assembly. The power interconnection plate 21 is fixed over the signal interconnection plate 22.

0173The power plate 21 is fixed in two different ways.

0174<b>According to a first non-limiting manner,</b> illustrated at <figref idref="f0060">Fig. 20</figref>, the power plate 21 is placed on the signal plate 22 so that:<ul id="ul0065" list-style="dash" compact="compact"><li>the fixing lugs 215 are placed opposite the studs 113 of the modules 22, said studs making it possible to position said plate 21,</li><li>the power terminals 2120, 2110 are placed opposite the corresponding traces of the module 103, 104,</li></ul>

0175In the case of a brush holder, it is positioned so that it fits into the clearance 605, and the brush cage protector into the clearance 603 of the bearing.

0176Then, after pressure, the fixing lugs 215 are fixed on the studs 113, the power terminals 2120, 2110 respectively press on the ends of the tracks 103, 104 of the modules.

0177<b>According to a second, non-limiting, preferential manner,</b> illustrated at <figref idref="f0065">Fig. 25</figref>, the power plate 21 is placed on the signal plate 22 so that:<ul id="ul0066" list-style="dash" compact="compact"><li>the inserts 219 are placed opposite the studs 226g, said holes and studs serving as a polarizer,</li><li>the tab 218 is placed opposite the retaining clip 227 of the signal plate 22. Then, after pressing, the orifices 219 are inserted on the studs 226g and the tab 218 engages in the clip 227, and</li><li>orifice 219c is placed opposite a third stud 226g.</li></ul>

0178<b>In a last step),</b> we mount the hood on the assembly. In this way, the cover 70 forms a cover for the rear bearing of the machine.

0179The cover 70 is attached in two different ways.

0180<b>According to a first non-limiting manner,</b> illustrated in <figref idref="f0061">Fig. 21</figref> and <figref idref="f0062">22</figref>, the cover 70 is placed on the power plate 21 so that the grooves 77 of the cover are located opposite the guides 107 of the control module 30. These guides and these grooves serve as a polarizer.

0181Then, after pressure, said grooves fit into said guides so that:<ul id="ul0067" list-style="dash" compact="compact"><li>contact is made between the signal traces 75 of the cover 70 and the tabs 106c of the control module 30, and</li><li>contact is established between the power traces 71 (B +), 72 (B-) of the cover and respectively the power traces 212, 211 of the power plate 21.</li></ul>

0182Finally, after installation of the cover, the electrical connection is made between the traces 71, 72 of the cover and the traces 212, 211 by laser welding via the openings 74.

0183The cover is fixed by three screws or nuts 78.

0184<b>According to a second, non-limiting, preferential manner,</b> illustrated at <figref idref="f0066">Fig. 26</figref>, the cover 70 is placed on the power plate 21 in the same way as the first way in order to establish the electrical contacts. In addition, the openings 79 are placed above the three studs 226g which secure the electronic assembly.

0185Then, after pressure, the cover 70 is fixed by means of said studs on the electronic assembly (bearing-modules-interconnection plates).

0186In this case, the cover 70 presses on all the elements of the arrangement and thus ensures a sufficiently strong support to both immobilize the power plate 21 on the dissipator bearing and ensure the necessary electrical contacts.

0187Thus, as can be seen, according to this first mode of assembly, the electronic modules 10, the signal interconnection piece 22, the power interconnection piece 21 and the heat sink respectively occupy a first, second, third and fourth planes all parallel to each other, and the planes are superimposed in the following order, starting from the plane closest to the rear bearing of the machine:<ul id="ul0068" list-style="dash"><li>fourth plan,</li><li>foreground,</li><li>second plan, and</li><li>third plan.</li></ul>Thus, the power interconnection part 21 is independent of the electronic modules and is connected to said modules in particular only by its electrical power terminals. The same is true for the signal interconnection part 22 which is connected to said modules in particular only by its signal connections 106.

<u>2) 2</u>^<u>th</u><u>assembly method or arrangement</u>

0188According to a second mode of assembly of the modules, or arrangement, an electronic module interfaces with the following elements:<ul id="ul0069" list-style="dash" compact="compact"><li>a heatsink 80,</li><li>a signal interconnection piece 22 according to the third embodiment</li><li>a power interconnection piece 21 according to the third embodiment</li><li>a cover 70, according to the third embodiment</li></ul>

0189Thus, the 2^th assembly mode of all the parts described above is carried out as follows.

0190It will be noted that in the example taken for this mode of assembly, there are four modules which are fixed on the heat sink 80. Three power modules 20 and a control / excitation module 30.

0191<b>In a first step 1),</b> illustrated at <figref idref="f0067">Fig. 27a</figref>, the modules are positioned on the upper face of the heat sink 80 so as to fix them.

0192The positioning is carried out by means of the positioning pins 109a and 109b which are placed opposite the orifices 810 of the heat sink 80, and during the positioning, the insert 120 of each module is positioned opposite each associated hole 804 of the heat sink. 80.

0193Subsequently, the fixing is done via:<ul id="ul0070" list-style="dash" compact="compact"><li>screws 1150 which fit into the fixing holes 115 of the modules and the corresponding holes 804 of the heat sink 80. These fixing screws also make it possible to connect the modules to ground via the insert 120, and</li><li>the connector 116 of the control / excitation module 30 which is screwed into the associated hole 807 of the heat sink, by means of a screw via. During assembly,</li><li>the electrical protection means 126 of the modules are inserted into the recesses 809 of the dissipator provided for this purpose.</li></ul>

0194Furthermore, the modules are also bonded to the heat sink 80 by means of an adhesive, such as a glass bead adhesive.

0195It will be noted that prior to the fixing of the control / excitation module 30 on the dissipator 80, the brush holder 50 was fixed on said module via the screw 117a provided for this purpose. In another variant, it can be fixed after installation of said module 30 on heat sink 80.

0196<b>In a second step 2),</b> illustrated at <figref idref="f0069">Fig. 28</figref>, the power plate 21 is positioned on the underside of the heat sink so as to fix said plate 21 on said heat sink 80.

0197Positioning is carried out by means of:<ul id="ul0071" list-style="dash" compact="compact"><li>positioning means 214d of said plate 21 which come opposite the associated positioning orifices 808 of the heat sink, and</li><li>of the fixing terminal 215d which comes opposite the electrical connection hole 805.</li></ul>

0198The fixing of said plate 21 on the heat sink 80 is effected by means of:<ul id="ul0072" list-style="dash" compact="compact"><li>two positioning means 214 which are placed in the corresponding openings 808 of the heat sink,</li><li>of the fixing terminal 215d which is plugged into the electrical connection hole 805, and</li><li>four stress legs 213d which are placed opposite the corresponding supports 814 of the dissipator. During assembly,</li><li>phase protection means 211d are integrated into the recesses 812 provided for this purpose in the dissipator.</li></ul>

0199So, as can be seen on the <figref idref="f0069">Fig. 28</figref> : <ul id="ul0073" list-style="dash" compact="compact"><li>the means 211d will protect the phase tabs of the stator,</li><li>the axial tabs of the electrical terminals 217d are then facing the corresponding positive traces 103 (B +) of each electronic module 10 which will make it possible to establish an electrical connection between said traces 103 and the positive trace 221d (B +) of the plate of power 21, and</li><li>the electric insert 216d integrated in terminal 215d enables the dissipator 80 to be grounded.</li></ul>

0200<b>In a third step 3),</b> illustrated at <figref idref="f0070">Fig. 29</figref>, the signal interconnection plate 22 is positioned on said electronic modules 10 so as to fix it.

0201It will be noted that the signal plate 22 is pre-positioned (pre-guided) by means of two protection pins 107 of two electronic modules 10, said pins being the furthest from each other in order to pre-guide properly.

0202Positioning is carried out by means of:<ul id="ul0074" list-style="dash" compact="compact"><li>two recessed protuberances 230 serving as pre-guiding and which are pre-positioned on two positioning pins or guides 107 belonging to electronic modules.</li></ul>

0203Then, subsequently, the signal plate 22 can be positioned by means of the positioning pins 224 in the corresponding holes 811 of the heat sink 80.

0204During assembly, we have:<ul id="ul0075" list-style="dash" compact="compact"><li>the connection recesses 221a which are placed opposite the signal connection elements 106a of the modules,</li><li>the connection recesses 221b which are placed opposite the signal connection elements 106b of the modules,</li><li>the crutches 225a and 225b which are placed opposite the support zones 119, 114 respectively of the modules, and</li><li>the inserts 226 which are placed opposite the corresponding orifices 806 of the heat sink.</li></ul>

0205Fixing is carried out by means of:<ul id="ul0076" list-style="dash" compact="compact"><li>2101d insulated hollow rivets associated with 210d inserts on the power plate. These 2101d rivets inside the inserts allow, on the one hand, an assembly of the signal plate, and on the other hand an isolation of the mass of the dissipator from the mass of the bearing, and finally the creation of an electronic sub-assembly (the two plates, the heat sink and the electronic modules) pre-assembled so that during assembly on the bearing, by means of screws or studs, after soldering the signal connections 106 with the plate of signal 22, there are no additional stresses which risk mechanically stressing said welds.</li></ul>

0206Then, after pressure, the signal tabs 106 are inserted into said corresponding interconnection orifices 2210, 2211, the legs 225 are supported on the bearing zones 119, 114 of the modules.

0207Note also the housings 231 of the signal plate comprise in the example illustrated in <figref idref="f0070">Fig. 29</figref> a capacitor associated with each of the power modules 20, which is connected, on the one hand to the positive trace 103 (B +) of the associated module, and on the other hand, to the negative trace 104 (B-) of the said associated module.

0208In addition, preferably, a tin or laser solder can be carried out, or else a resin + polymerization can be deposited in the connection recesses 221a and 221b of the signal tabs 106 in order in particular to protect them from the salt spray.

0209<b>In a fourth step 4),</b> illustrated at <figref idref="f0071">Fig. 30a</figref>, all of the electronics thus obtained are positioned on the rear bearing 90 of the machine.

0210Fixing is carried out by means of:<ul id="ul0077" list-style="dash" compact="compact"><li>of four studs 226g or screws in the rear bearing 90 via the inserts 226 of the signal plate 22, 210d of the power plate 21 and 806 of the corresponding heatsink 80. The studs press on said plate and therefore on the plate-dissipator-bearing assembly so as to create an electronic assembly on the bearing. In the same way, the screw 226v is screwed into the respective corresponding holes 226 and 807 of the plate 22 and of the heat sink 80.</li></ul>

0211The <figref idref="f0072">Fig. 30b</figref> is a sectional view along the XY plane shown in <figref idref="f0071">Fig. 30a</figref>, showing a whole assembly of main parts mentioned above. It shows in particular:<ul id="ul0078" list-style="dash" compact="compact"><li>level 90,</li><li>the signal interconnection plate 21,</li><li>the heatsink 80,</li><li>the signal interconnection plate 22,</li><li>a 2101d rivet, and</li><li>a 226g fixing stud.</li></ul>

0212It will be noted that prior to the electronic assembly, the rear bearing 90 of the machine was fixed on the front bearing (not shown) of said machine via four tie rods in holes 903, the holes being illustrated on the figure. <figref idref="f0073">Fig. 30c</figref> of the bearing 90. The tie rods are thus screwed on before electronic assembly, which makes it possible to position the phases of the stator beforehand and therefore to facilitate the assembly of the electronic sub-assembly with said phases.

0213The rear bearing comprises in particular:<ul id="ul0079" list-style="dash" compact="compact"><li>a positioning orifice 901 configured to receive the positioning pin 1151 of the control / excitation module 30, which allows precise positioning of the position sensors with respect to the bearing, and</li><li>a referencing orifice 902 in which the pin 212d of the power plate 21 is inserted.</li></ul>

0214The 105cr phase hooks are also welded to the phases of the stator (standard or terminal wires).

0215<b>Finally, in a fifth step 5),</b> the plastic cover 70 is put in place by means of fixing clips which snap onto the studs.

0216It will be noted that the steps defined above can be carried out in a different order. For example, the second step can of course be carried out before the first step (the<figref idref="f0068">Fig. 27b</figref> illustrates this case) or after the third step.

0217Thus, the second assembly method has the following advantages:<ul id="ul0080" list-style="dash" compact="compact"><li>First, the assembly of all the electronic part (modules, power and signal plates) is done outside the rear bearing so that the electronics can be tested before assembly on the machine; electronics which operate in said machine are thus integrated, thereby saving time in terms of process, and having two independent processes and therefore not modifying the existing standard machine assembly "process" method. already;</li><li>Secondly, the assembly of the electronic part can be done after the assembly of the rear bearing of the machine on the front bearing, more particularly after the installation of the tie rods of the bearings which will then be covered by the electronics;</li><li>Third, thermal cooling performance is improved due to the axial air flow added to the radial air flow. There is a reduction in pressure drops with an axial air inlet;</li><li>Fourth, the hood is no longer just a plastic hood. There are no overmolded traces in the cover, the power traces and the signal traces being integrated respectively in the power plate and in the control / excitation module, which makes it possible to limit the number of welding seams. interconnection to be done;</li><li>Fifth, the ground plane is achieved by the heatsink. There is therefore a decrease in the resistance and inductance of the internal power circuit between the customer two-phase power connector and the power module due to the proximity of the positive polarity trace (B +) to the power plate. 21 with the dissipating mass.</li><li>Sixth, the ground plane is produced by the dissipator, so that there is a gain in axial size. An existing part is thus used to carry current.</li></ul>

0218Thus, according to this second assembly mode, the electronic modules 10, the signal interconnection piece 22, the power interconnection piece 21 and the heat sink respectively occupy a first, second, third and fourth planes all parallel to each other. , and the planes overlap in the following order, starting from the plane closest to the rear landing:<ul id="ul0081" list-style="dash"><li>third plan,</li><li>fourth plan,</li><li>foreground, and</li><li>second plan.</li></ul>

0219Thus, the power interconnection part 21 is independent of the electronic modules and is connected to said modules in particular only by its electrical power terminals. The same is true for the signal interconnection part 22 which is connected to said modules in particular only by its signal connections 106. Thus, all four parts form an electronic sub-assembly independent of a bearing of the machine.

0220It will be noted that the two assembly methods have the advantage of using the maximum surface area available on the rear of the machine for the modules thanks to the stacking of the various elements for the power and signal interconnections, unlike a solution in which traces of power and signal interconnection would occupy the surface on the rear of the machine to the detriment of the modules.

0221It will be noted that the signal interconnection plate 22 according to the various embodiments described above can be used when there is no power plate 21. For example with modules themselves carrying out their power interconnection.

0222As for the power interconnection plate 21 according to the various embodiments described above, it can also be used without the signal plate 22. For example, with an electronic board PCB performing the signal interconnection.

0223The assembly according to all the embodiments presented above has the following additional advantages:<ul id="ul0082" list-style="dash" compact="compact"><li>it avoids stacking all the tracks one on top of the other, as stacking is not conducive to good maintenance of the tracks in position,</li><li>it comprises means for fixing to the heat sink or to the heat sink bearing which are not concentrated on the periphery of said heat sink or bearing, so that there is a distribution of forces so as to withstand mechanical vibrations well,</li><li>it allows the different elements (interconnection plates and modules) to be in different planes and perpendicular to the axis of rotation of the machine, so that it creates more room for traces of power which results in a decrease in the resistivity of said traces. Thus, this assembly makes it possible to convey greater power,</li><li>it allows optimum use of the space available for the electronic modules on the rear bearing of the machine, the various elements (interconnection plates and modules) being on different planes and perpendicular to the axis of rotation of the machine .</li></ul>