Axial-gap rotating electric machine

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to a compact and lightweight axial gap rotary electric machine for robots or an ultra-high speed rotation and high output axial gap rotary electric machine for power and power generation.

【0002】

[Conventional technology]

Since a general cylindrical ultra-high-speed rotating electric machine of 10,000 rpm or more has a considerably large centrifugal force during rotation, in the case of a rotating electric machine using a permanent magnet as a field magnet, the thickness is considerable so that the permanent magnet does not scatter. The non-magnetic holding ring is provided on the outer peripheral surface of the permanent magnet, and in the case of a rotary electric machine in which a coil is provided on the rotor, the coil end ring is held in the holding environment.

【0003】

On the other hand, in the axial gap rotary electric machine, one rotor disk and a stator disk provided with an armature coil face each other with one rotor disk via a gap, and are configured in the same rotation axis direction. The rotor disk is provided with a coil or a permanent magnet for forming a field pole.

【0004】

[Problems to be Solved by the Invention]

However, when the conventional cylindrical rotary electric machine as described above rotates at an ultra-high speed of 10,000 rpm or more, the centrifugal force at the time of rotation becomes considerably large, so that the coil of the rotor cannot withstand the strength and may be damaged. Further, as shown in FIG. 14, when a permanent magnet 1 is used for the field magnet, a non-magnetic holding ring 2 having a considerable thickness is required so that the permanent magnet 1 does not scatter. Since the holding ring 2 uses a non-magnetic material so that the magnetic circuit is not short-circuited, the magnetic gap length is inevitably long, the magnetomotive force consumed between the gaps is large, and the output of the rotary electric machine is increased. descend. In the figure, 3 is a stator frame, 4 is a stator core, 5 is a coil, 6 is a rotor, 7 is a rotor yoke, 8 is a rotating shaft, and 9 is a gap.

【0005】

On the other hand, in the axial gap rotary electric machine, as shown schematically in FIG. 15, the disk-shaped rotor yoke 10 is composed of soft iron or the like which is a magnetic material, so that the axial gap rotary electric machine is compared with the cylindrical rotary electric machine which is usually used. Therefore, the inertia of the rotor becomes considerably large. Therefore, the time from start to reach the target speed and the time from rotation to stop become considerably long, and the rapid acceleration / deceleration operation required for robots, automatic machines, and the like is considered inappropriate. In the figure, 11 is a motor frame, 12 is a stator yoke, 13 is a coil composed of U-phase 13a, V-phase 13b, and W-phase 13c, 14 is a bearing, 15 is a rotating shaft, and 16 is a permanent magnet.

【0006】

As a configuration of large capacity and high speed rotation, if the rotor disk is multi-staged in the structure of the conventional axial gap rotary electric machine, the stator disk with the coil and the rotor disk are alternately arranged in the direction of the rotation axis, which makes manufacturing impossible. .. Therefore, since the capacity is increased by using only one rotor disk, the outer diameter of the rotor becomes large, which makes it difficult to increase the speed and output.

【0007】

Further, as an electromagnetic configuration, the rotor uses a magnetic material such as soft iron for the rotor yoke 10 because of the magnetic path through which the magnetic flux passes, which increases the weight of the rotor and the mechanical strength of the rotor material due to centrifugal force. In addition, the load applied to the bearing increases, the critical speed, which is the rotation limit speed of the rotating shaft, decreases, and high-speed rotation becomes impossible.

【0008】

Therefore, an object of the present invention is to provide an axial gap rotary electric machine that is compact, lightweight, relatively easy to accelerate / decelerate, or can rotate at an ultra-high speed of tens of thousands of revolutions / minute, and further makes it easy to increase the output. To do.

【0009】

[Means for solving problems]

In order to achieve the above object, in order to achieve the above object, a coil formed in a disk shape and a back yoke in which a magnetic steel plate is spirally wound in the vicinity of the coil and has no slot are arranged at both ends in the axial direction of the stator frame. Rotates a disk that is formed in a disk shape with a resin, is arranged so as to form a gap in the axial direction with the coil, and is fixed by penetrating an axially magnetized permanent magnet in the axial direction. It is composed of a rotor that is mounted so as to rotate integrally with the shaft.

【0010】

[Action]

First, the mechanical structural aspect will be described.

【0011】

(1) Light weight and acceleration / deceleration In a rotary electric machine, a magnetic material yoke is indispensable as a magnetic path for passing magnetic flux through the rotor, and the larger the capacity, the larger the inertia. Further, in the axial gap rotary electric machine, when the disk body is made of metal, the inertia of the rotor becomes considerably large, which is disadvantageous for rapid acceleration / deceleration operation.

【0012】

However, in the present invention, since the rotor disk body can be made of a non-magnetic material, by using a disk body made of a resin having a specific gravity smaller than that of metal, the inertia of the rotor becomes very small, and rapid acceleration / deceleration operation is performed. It will be advantageous.

【0013】

Further, regarding the weight of the rotary electric machine, the rotor is made of only resin except for the rotating shaft and the permanent magnet, and is very light. By forming the stator frame and bracket with resin, the metal parts are only the back yoke, coil, permanent magnet, and rotating shaft of the stator, and a significant weight reduction can be realized. Further, the rotary electric machine of the present invention can have a large capacity in multiple stages as described in the section of increasing the capacity. Therefore, the back yoke and bracket of the stator have the same dimensions and weight, and it is only necessary to increase mainly the multi-stage coil and the permanent magnet, and the effect of light weight is more remarkable.

【0014】

(2) Regarding high-speed rotation, in the rotary electric machine of the present invention, a permanent magnet serving as a field is fixed so as to penetrate in the axial direction with respect to the rotor plane of the disk body. Therefore, the disk body of the rotor acts to prevent the permanent magnets from popping out due to centrifugal force at high speeds. In order to increase the centrifugal force resistance, it is necessary to make the disk body member sufficiently thick. In the conventional cylindrical rotary electric machine with a field and coil in the radial direction, the magnetic void length becomes longer when the holding ring on the outer circumference of the rotor provided for centrifugal force is thickened. .. However, in the rotary electric machine of the present invention, even if the thickness of the disk body is sufficiently thickened, the operating magnetic circuit is formed in the axial direction, so that the gap length of the operating portion is not formed and the speed is increased without reducing the output. Rotation is possible.

【0015】

The permanent magnets that form the poles of the field are not one permanent magnet per pole, but multiple permanent magnets are dispersed and embedded in multiple holes in the rotor disk, so that the stress due to the centrifugal force of the permanent magnets is applied to the disk. It is possible to avoid concentrating on a part of the body and can withstand ultra-high speed rotation.

【0016】

Further, by reducing the diameter of the permanent magnet on the outer peripheral side of the permanent magnet on the inner peripheral side, the centrifugal force can be improved, the inertia of the rotor can be effectively reduced, and the characteristics of the rotary electric machine can be improved.

【0017】

(3) Regarding the increase in capacity When the capacity of the conventional axial gap rotary electric machine is increased, the rotor radius becomes larger. As a result, the size of the machine is increased, the low inertia is significantly increased, and the permissible rotation speed is significantly reduced due to the strength of the centrifugal rotor material. As explained in terms of electromagnetics, in the rotary electric machine of the present invention, since the rotor does not have an iron core, the magnetic circuit consists of only two back yokes, permanent magnets and voids provided at both ends in the axial direction of the stator frame, and is magnetic. The magnetic part that makes the path is only the two back yokes on both sides. Therefore, simply by sequentially providing the coil of the stator and the disk body of the rotor, which can be divided into two or more, between the two back yokes, the operating portion of the multi-stage rotary electric machine is formed, and high output can be realized.

【0018】

In the rotary electric machine of the present invention in order to increase the capacity, the rotor has multiple stages, but by forming the disk body with resin or non-magnetic light metal, the inertia of the rotor becomes significantly smaller than before, and the rotor has multiple stages. Since all the disks have the same outer diameter, the mechanical stress due to centrifugal force does not increase, and the capacity of the axial gap rotary electric machine can be increased in terms of mechanical aspects.

【0019】

Further, in the rotary electric machine of the present invention, the rotor has a spinning top shape similar to a flywheel due to the axial gap, and the distance between the bearings on both sides supporting the disk body of the rotor is considerably shortened. Increases rigidity. Therefore, the torsional vibration frequency of the shaft becomes high, and the shaft can rotate stably with less vibration even in ultra-high speed rotation. Next, the electromagnetic aspect will be described.

【0020】

Since the coil consists only of the lead wire and molding resin and does not have the iron core of the rotor, the magnetic circuit consists of only two back yokes, permanent magnets and voids provided on the inner surfaces of both ends in the axial direction of the stator frame, and the magnetic path. The magnetic part that makes up is only the two back yokes on both ends. Therefore, simply by sequentially providing the coil of the stator and the disk body of the rotor, which can be divided into two or more, between the two back yokes, the operating portion of the multi-stage rotary electric machine is formed, and high output is possible.

【0021】

Since the back yoke of the stator has no teeth and no iron core of the rotor, the magnetic circuit consists of only the back yoke permanent magnets and voids, and the magnetic parts that make the magnetic path are only the two back yokes on both ends. It is possible to form a moving part of a multi-stage rotary electric machine. Therefore, the iron loss is significantly reduced, and it is possible to increase the efficiency and decrease the temperature rise during the operation of the rotary electric machine.

【0022】

In the axial gap rotary electric machine, since the circumference on the inner diameter side is naturally shortened, the space at the end of the coil is narrowed, and there is a problem that the number of times the coil is wound cannot be increased. However, due to the above-mentioned reduction in iron loss, it is possible to manufacture an ultra-high-speed, multi-pole rotary electric machine driven by high frequency. When the number of poles is increased, the end of the coil becomes shorter and the number of coil turns increases. High output. Since the back yoke is formed by winding a thin magnetic steel plate in a spiral shape, iron loss due to the generation of eddy current is suppressed.

【0023】

At high speed rotation, in a conventional rotary electric machine, the gap magnetic flux pulsates due to the teeth of the stator core, and a considerably large eddy current is generated on the rotor surface. However, since the rotary electric machine of the present invention has no teeth on the back yoke, this eddy current is not generated and the efficiency is improved.

【0024】

In the coil, the soft magnetic material constituting the magnetic path is only the back yoke, so that the magnetic gap seen from the coil becomes considerably large. Therefore, the inductance of the coil becomes considerably small, the voltage drop of the inductance becomes small, and at the same time, the terminal voltage becomes small. Therefore, it is possible to reduce the size of the drive power supply.

【0025】

Further, when the magnetic gap becomes large, the armature reaction by the coil also becomes small, so that demagnetization of the permanent magnet in the rotor can be prevented, and a large current can be passed. Next, the stator division will be described.

【0026】

The rotary electric machine of the present invention has a configuration in which a rotor disk body and a molded coil can be alternately arranged in the axial direction by using a multi-stage operating unit in order to increase the output. Therefore, by dividing the stator into upper and lower parts in a plane including the axis of the rotating shaft, it is possible to accommodate the rotor in the divided state. At the same time, it is necessary to make the coil of the stator able to be divided into two, and the one-sided winding method is adopted to form a coil that forms an imaginary pole between the real pole and the real pole, and the center of the imaginary pole is on the two-divided line of the stator. By doing so, even if the stator is divided into two, the conducting wire in the mold coil is not cut, and the rotary electric machine of the present invention can be configured.

【0027】

The present invention is an axial gap, and by dividing the rotor into upper and lower parts in a plane including the axis of the rotating shaft, the rotor can be easily taken out and maintenance can be facilitated.

【0028】

Further, since the coil is formed by itself without being wound around the teeth of the iron core, the stator can be divided and only the coil can be easily taken out, and the coil can be easily replaced.

【0029】

[Example]

Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a cut portion of the upper half of an embodiment of the present invention.

【0030】

In the figure, reference numeral 20 denotes an axial gap rotary electric machine, and the axial gap rotary electric machine 20 is composed of a stator 21 and a rotor 22 rotatably supported by the stator 21 via a bearing.

【0031】

In this configuration, the stator 21 is formed by molding with a fiber-reinforced epoxy resin, and has a structure in which the rotor 22 is divided into upper and lower parts in a plane including the axial center of the rotor 22 and both ends in the axial direction of the stator frame 23. Brackets 24, 24 formed by molding with fiber reinforced epoxy resin, and attached to a bolt or other appropriate fixing means (not shown) at the axial center of the stator frame 23. , The mold coil 25A, which has a substantially disk shape as a whole and has a structure divided into upper and lower parts in a plane including the axis of the rotor 22, and the bracket 24 so as to face each other via the rotor disk described later. It is composed of a mold coil 25B embedded inside and a back yoke 26 embedded in a bracket 24 or attached via a bolt so as to be outside the mold coil 25B. Here, the mold coil 25A has U, V, and W phase windings as shown in FIG. 2, adopts a one-sided winding method (or concentric winding method), and is molded with an epoxy resin or the like. It has a divided structure. The mold coil 25B also has substantially the same U, V, and W phase windings, but is not divided into two. As shown in FIGS. 3 and 4, the back yoke 26 has a structure in which a silicon steel plate 26a having a thickness of 0.2 mm is spirally wound, and the outer peripheral side and the inner peripheral side are sandwiched between rings 26b and 26c, respectively. It is said.

【0032】

Further, the rotor 22 is arranged so as to form a mold coil 25A, 25B and a gap 28,28 at the rotating shaft 27 and the axial intermediate portion of the rotating shaft 27, and is formed in a disk shape by molding a fiber reinforced resin. It is composed of two rotor disks 29, 29, which are mounted so as to rotate integrally with the rotating shaft 27. Here, as shown in FIG. 5, the permanent magnets 30 are equally arranged at 12 locations on the rotor disk 29, and 10 magnets are dispersedly attached to each location (1 pole). The permanent magnet 30 is formed in a cylindrical shape and is magnetized along the axial direction, and is fixed through the hole of the rotor disk 29. Further, a metal ring (not shown) that engages with a key (not shown) is integrally provided on the center side of the rotor disk 29 so as to rotate integrally with the rotating shaft 27. Further, a spacer 31 is inserted between the rotor disks 29, and the outside of each rotor disk 29 is pressed toward the center by the ring-shaped pressing metal fitting 32. Next, the operation of the embodiment configured as described above will be described. First, the mechanical structure will be described.

【0033】

(1) Light weight and acceleration / deceleration As is well known, a magnetic material yoke is indispensable for a rotating electric machine as a magnetic path for passing magnetic flux through a rotor, and the larger the capacity, the larger the inertia. Further, as shown in FIG. 15, in the conventional axial gap rotary electric machine, if the disk is made of a magnetic material such as soft iron, the rotor has a disk shape and the inertia becomes considerably large, which is disadvantageous for rapid acceleration / deceleration operation.

【0034】

However, in this embodiment, since the rotor can be made of a non-magnetic material except for the rotating shaft and the permanent magnet 30, the rotor disk 29 formed by molding with a fiber reinforced resin having a specific gravity of 1.5 is used for the rotor. Inertia becomes very small.

【0035】

Regarding the weight of the rotary electric machine, the rotor disk 29, the stator frame 23 and the bracket 24 are also made of resin, and the main part of the metal part is the back yoke 26, the winding of the mold coil 25A, 25B, the permanent magnet 30, the rotation. Only the shaft 27 is used, and a significant weight reduction can be realized. Further, the rotary electric machine of the present embodiment can have a large capacity in multiple stages as described in the section of increasing the capacity. Therefore, the back yoke 26 and the bracket 24 of the stator have the same dimensions and weight, and it is only necessary to increase the mold coil 25A and the permanent magnet 30 in the multi-stage portion, and the effect of light weight is more remarkable.

【0036】

(2) For high-speed rotation, it is necessary to make the outer peripheral member of the rotor sufficiently thick in order to strengthen the centrifugal force during rotation. As shown in FIG. 14, a conventional rotary electric machine of a cylindrical magnetic circuit having a field and a coil in the radial direction is magnetic when the holding ring 2 on the outer circumference of the rotor provided for centrifugal force is thickened. Void 9 becomes longer.

【0037】

However, in this embodiment, the permanent magnet 30 serving as a field magnet is embedded so as to penetrate the plane of the rotor disk 29 in the axial direction. Therefore, the rotor disk 29 acts to prevent the permanent magnet 30 from popping out due to centrifugal force at high speed. Further, in this embodiment, even if the outer peripheral portion of the rotor of the rotor disk 29 is sufficiently thickened, the magnetic field created by the permanent magnet 30 is formed in the direction of the rotation axis, so that the magnetic gap of the magnetic circuit increases. There is no such thing. Therefore, by increasing the mechanical strength as the centrifugal force, the output does not decrease and high-speed rotation becomes possible. Further, the permanent magnets 30 that form the poles of the field are not one permanent magnet per pole, but a plurality of (for example, 10) permanent magnets 30 per pole are dispersed to form a plurality of rotor disks 29. Since it is embedded in (for example, 10) holes, it is possible to prevent the stress due to the centrifugal force of the permanent magnet 30 from concentrating on a part of the rotor disk 29, and it can withstand ultra-high speed rotation.

【0038】

(3) Regarding the increase in capacity When the capacity of the conventional axial gap rotary electric machine is increased, the rotor radius becomes larger, which inevitably increases the size of the machine, significantly increases the inertia of the rotor, and the strength of the centrifugal rotor material. Due to this, the permissible rotation speed is significantly reduced. As will be explained later in terms of electromagnetics, in this embodiment, since there is no rotor core, the magnetic circuit has two back yokes 26,26, permanent magnets 30, and voids 28 provided inside 24,24 on both brackets. The magnetic part that makes the magnetic path is only the two back yokes 26 and 26 on both sides. Therefore, simply by sequentially providing the mold coil 25A and the rotor disk 29, which can be divided into two or more, between the two back yokes 26 and 26, the operating portion of the multi-stage rotary electric machine is formed, and high output can be realized.

【0039】

In this embodiment, the rotor 22 has a multi-stage configuration in order to increase the capacity, but the inertia of the rotor 22 to which the rotor disk 29 made of resin is attached is significantly smaller than the conventional one, and the multi-stage rotor disk 29 Since they all have the same outer diameter, the mechanical stress due to centrifugal force does not increase, and the capacity of the axial gap rotary electric machine can be increased in terms of mechanical aspects.

【0040】

Further, in this embodiment, since the rotor 22 rotates in an axial gap, the rotor 22 has a top shape similar to a flywheel, and the distance between the bearings on both sides supporting the rotor disk 29 is considerably shortened. Therefore, the rigidity of the rotating shaft is reduced. Will be higher. Therefore, the torsional vibration frequency of the shaft becomes high, and the shaft can rotate stably with less vibration even in ultra-high speed rotation. From the results of the rotary shaft vibration analysis of this embodiment shown in FIG. 6, it can be seen that the primary vibration mode of the rotary shaft is 33000 rpm, and the high-speed rotation characteristics are sufficiently good.

【0041】

From the results of the rotational strength test of this example shown in FIG. 7, it was confirmed that the fluctuation of the rotating shaft was slight even at 20000 rpm, the rotor was rotating stably, and the mechanical strength was sufficient. Next, the electromagnetic aspect will be described.

【0042】

Since the mode coils 25A and 25B consist only of U, V, W phase windings and fiber reinforced epoxy resin, and there is no iron core of the rotor, the magnetic circuit is provided inside the bracket 24. It consists of only 26, a permanent magnet 30 provided on the rotor disk 29, and a gap 28, and the magnetic part that forms the magnetic path is only the two back yokes 26 and 26 on both sides. Therefore, simply by alternately providing the mode coil 25A capable of being divided into two or more and the rotor disk 29 between the two back yokes one after another, the operating part of the multi-stage rotary electric machine is formed, and high output is possible. ..

【0043】

Since there are no teeth on the stator core and no iron core on the rotor, the magnetic circuit consists of only the back yoke 26, the permanent magnet 30 and the void 28, and the magnetic parts that make up the magnetic path are only the two back yokes 26 and 26 on both sides. It is possible to form a moving part of a multi-stage rotary electric machine. Therefore, the iron loss can be significantly reduced, the efficiency can be increased, and the temperature rise during the operation of the rotary electric machine can be lowered. If the stator core has teeth, the void magnetic flux pulsates during high-speed rotation, and a considerably large eddy current is generated on the rotor surface. However, in this embodiment, since there are no teeth of the iron core, this eddy current is not generated and the efficiency is improved.

【0044】

In the axial gap rotary electric machine, since the circumference on the inner diameter side is naturally shortened, the space at the end of the mold coil 25A is narrowed, and there is a problem that the number of coil turns cannot be increased. However, due to the above-mentioned effect of reducing iron loss, it is possible to manufacture a multi-pole rotary electric machine at ultra-high speed driven by high frequency, and when the number of poles is increased, the end of the mold coil 25A becomes shorter and the number of coil turns becomes shorter. Is increased, and the output becomes high.

【0045】

The back yoke 26 is formed by spirally winding a strip-shaped 0.2 mm-thick silicon steel plate 26a, sandwiching it between the outer ring 26b and the inner ring 26c, and fixing it to suppress iron loss due to the generation of eddy current. ing.

【0046】

In the molds 25A and 25B, the soft magnetic material constituting the magnetic path is only the back yoke 26, and the magnetic gap seen from the mold coils 25A and 25B becomes considerably large. Therefore, the inductance of the molded coils 25A and 25B becomes considerably small, the voltage drop of the inductance becomes small, and at the same time, the terminal voltage becomes small. Therefore, it is possible to reduce the size of the drive power supply.

【0047】

Further, when the magnetic gap becomes large, the armature reaction caused by the mold coils 25A and 25B also becomes small, so that demagnetization of the permanent magnet 30 in the rotor can be prevented, and a large current can be passed.

【0048】

In the embodiment described above, the case where two rotor disks 29 are attached to the rotor 22 is shown, but it is needless to say that a configuration in which one rotor disk 29 is attached is also possible. Of course, in this case, the mold coil 25A is not provided, and the stator frame 23 does not need to be divided into two.

【0049】

Next, an embodiment in which the stator is divided into two as shown in FIG. 8 and the mold coil and the back yoke to be attached to the bracket side are manufactured separately from the bracket and attached to the bracket via bolts will be described. FIG. 9 is a cross-sectional view of the upper half of this embodiment cut out.

【0050】

In FIG. 9, 35 is an axial gap rotary electric machine, and the axial gap rotary electric machine 35 is composed of a stator 36 and a rotor 37 rotatably attached to the stator 36 via a bearing.

【0051】

In this configuration, the stator 36 is formed by molding with fiber reinforced epoxy resin, and has a structure that is divided into upper and lower halves in a plane including the axial center of the rotor 37, and both ends in the axial direction of the stator frame 38. Brackets 39 and 39, which are attached via bolts, molded with fiber reinforced epoxy resin, and divided into upper and lower parts in the horizontal plane including the axial center of the rotor 37, and the center of the stator frame 38 in the axial direction. The mold coil 25A shown in FIG. 2 which is attached via bolts and divided into two in the vertical direction, and the mold attached to the bracket 39 via bolts so as to face the mold coil 25A via a rotor disk described later. It is composed of a coil 25C and a back yoke 40 inserted into a recess provided in the bracket 39 so as to be outside the molded coil 25C and attached to the bracket 39 via a bolt. Here, as shown in FIGS. 10 and 11, the back yoke 40 is divided into upper and lower parts at the center, and a 0.2 mm thick silicon steel plate 40a is spirally wound to ring the outer peripheral side and the inner peripheral side, respectively. It has a fixed structure sandwiched between 40b and 40c.

【0052】

Further, the rotor 37 is arranged so as to form gaps 42 and 42 with the mold coils 25A and 25C at the rotary shaft 41 and the axial intermediate portion of the rotary shaft 41, respectively, so as to rotate integrally with the rotary shaft 41. It consists of two mounted rotor disks 29,29. Here, a plurality of rod-shaped permanent magnets 30 magnetized in the axial direction are attached to the rotor disk 29 so as to penetrate in the axial direction and become one, and rotate integrally with the rotating shaft 41 at the center. A ring (not shown) having a keyway (not shown) that engages with a key (not shown) for engaging with the key (not shown) is integrally provided. Further, a spacer 31 is inserted between the rotor disks 29, and the outer surface of each rotor disk 29 is pressed toward the center by the ring-shaped pressing metal fitting 32.

【0053】

Next, the stator is divided into two parts, four mold coils are attached to the stator side, three rotor disks are attached to the rotor side, and the mold coil and back yoke to be attached to the bracket side are separate from the bracket. The example produced in the above will be described. FIG. 12 is a cross-sectional view of the upper half of this embodiment cut out.

【0054】

In FIG. 12, 45 is an axial gap rotary electric machine, and the axial gap rotary electric machine 45 is composed of a stator 46 and a rotor 47 rotatably attached to the stator 46 via a bearing.

【0055】

In this configuration, the stator 46 is formed by molding with a fiber reinforced epoxy resin, and has a structure in which the rotor 47 is divided into upper and lower parts in a plane including the axial center of the rotor 47, and both ends in the axial direction of the stator frame 48. Brackets 49,49, which are attached to the top via bolts, molded with fiber reinforced epoxy resin, and divided into upper and lower parts in the plane including the axis of the rotor 47, and the stator frame 48 in the axial direction. The mold coils 25A and 25A shown in FIG. 2, which are attached to the portions via bolts and are opposed to each other via a rotor disk described later, and are divided into two in the vertical direction, and each mold coil 25A and a rotor disk described later are used. It is composed of a mold coil 25D attached to the bracket 49 via a bolt so as to face each other, and a back yoke 40 inserted into the recess provided in the mold coil 25D and the bracket 49 and attached to the bracket 49 via a bolt. Has been done.

【0056】

Further, the rotor 47 is arranged so as to form gaps 55 and 51 with the mold coils 25A and 25C, respectively, at the rotating shaft 50 and the axial intermediate portion of the rotating shaft 50 so as to rotate integrally with the rotating shaft 50. It is composed of three rotor disks 29,29,29 attached to. Here, a plurality of rod-shaped permanent magnets 30 magnetized in the axial direction are attached to the rotor disk 29 so as to penetrate in the axial direction and become one, and rotate integrally with the rotating shaft 50 at the center. A ring (not shown) having a keyway (not shown) that engages with a key (not shown) for engaging with the key (not shown) is integrally provided. Further, a spacer 31 is inserted between the rotor disks 29, and the outer surface of the rotor disks 29 arranged on the outside is pressed toward the center by the ring-shaped presser fitting 32.

【0057】

In addition, in order to withstand higher speed rotation, the permanent magnets 30 attached to the rotor disk 29 may have different diameters on the outer peripheral side and the inner peripheral side as shown in FIG. That is, the diameter of the permanent magnet 30a on the outer peripheral side is made smaller than the diameter of the permanent magnet 30b on the inner peripheral side. Further, the rotor disk may be made of a non-magnetic metal having a small specific gravity such as duralumin instead of the fiber reinforced resin. Instead of molding the mold coil with the resin, semiconductor technology is applied and thin electricity is applied. A semi-circular coil in which a lead wire is printed and wired may be laminated on an insulating substrate. Further, not only the back yoke of the stator but also the structure of the stator core provided with teeth like a general rotary electric machine can obtain the effect of the present invention in increasing the capacity and rotating at high speed. However, there are problems such as an increase in iron loss, the effect of armature reaction, and an increase in bearing load due to an increase in magnetic attraction in the thrust direction.

【0058】

[Effect of the invention]

As described above, according to the present invention, since the disk body which is the main component of the rotor is formed of resin, the inertia of the rotor can be significantly reduced, and ultra-high speed rotation, rapid acceleration / deceleration, miniaturization, etc. can be realized. .. In addition, by forming the stator frame, bracket, etc. with resin, the metal part is only a slightly limited part, the weight can be significantly reduced, and the weight of the rotary electric motor itself becomes a load. The output can be effectively used when applied to the servo motor, drive motor of electric vehicle, etc. Further, by forming the stator in a divided structure, it is possible to provide an axial gap rotary electric machine in which the coil of the stator and the disk body of the rotor are alternately arranged in multiple stages through gaps to increase the output and facilitate maintenance.

[Simple explanation of drawings]

[Figure 1]

The cross-sectional view which shows the upper half part of one Example of this invention cut.

[Figure 2]

The block diagram of the mold coil used in one Example of this invention.

[Fig. 3]

The front view of the back yoke used in one Example of this invention.

[Fig. 4]

AA sectional view of FIG.

[Fig. 5]

The block diagram of the rotor disk used in one Example of this invention.

[Fig. 6]

The explanatory view which shows the operation of one Example of this invention.

[Fig. 7]

The explanatory view which shows the operation of one Example of this invention which is different from FIG.

[Fig. 8]

Explanatory drawing which shows the schematic structure of another Example of this invention.

[Fig. 9]

FIG. 5 is a cross-sectional view showing a cut portion of the upper half of another embodiment of the present invention.

[Fig. 10]

Front view of the back yoke used in another embodiment of the present invention.

[Fig. 11]

BB arrow view of FIG.

[Fig. 12]

FIG. 5 is a cross-sectional view of the upper half of a further different embodiment of the present invention.

[Fig. 13]

FIG. 5 is a configuration diagram of a rotor disk used in each embodiment of the present invention, which is different from FIG.

[Fig. 14]

A cross-sectional view of the upper half of a conventional cylindrical permanent magnet rotary electric machine.

[Fig. 15]

Explanatory drawing which shows the schematic structure of the conventional axial gap rotary electric machine.

[Explanation of symbols]

20,35,45 ... Axial Gap Rotating Machine, 21,36,46 ... Stator, 22,37,47 ... Rotor, 23,38,48 ... Stator Frame, 24,39,49. .. Bracket, 25A, 25B, 25C, 25D ... Molded coil, 26,40 ... Back yoke, 27,41,50 ... Rotating shaft, 28,42,51 ... Gap, 29 .. .Rotor disk, 30 ... permanent magnet.