Thrust generation mechanism

The present invention relates to a configuration that generates thrust, and relates to a highly efficient thrust generation mechanism that reduces leakage flux by making the directions of magnetic flux the same.

A conventional linear motor having a thrust generating mechanism has a shape in which a rotating machine is cut open, and a large attractive force acts between a mover composed of a row of magnets and an armature. [Patent Document 1] discloses a linear motor in which magnetic poles having a first polarity and a second polarity are alternately arranged in order to cancel the magnetic attraction. In the conventional technique, as shown in FIG. 1 described in [Patent Document 1], the same armature winding is arranged on the armature core, and the magnetic flux generated by passing an electric current through the armature winding is transmitted through the magnetic pole. Magnetic fluxes on the lower and upper sides of the magnet and magnetic fluxes in the same direction are generated. On the other hand, a magnetic pole in the opposite direction is generated in the adjacent magnetic pole. As a result, alternating magnetic poles can be generated in the gap with one armature winding. If the magnetic poles of the permanent magnets are arranged alternately in the gap, a force acts on the permanent magnets by passing an electric current through the armature winding.

<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2001-028875</text></patcit>

<p> However, in the conventional technique, since alternating magnetic poles are generated in the armature winding, the path of the magnetic flux generated in the armature winding becomes long because the magnetic flux and the armature iron core are used, and the magnetic efficiency is improved. There is a drawback that it is reduced and the weight becomes heavier in proportion to the length of the path.</p><p> Further, since the adjacent magnetic poles have different polarities, magnetic flux in the gap direction and magnetic flux between the magnetic poles are generated. Since the magnetic flux between adjacent magnetic poles is a magnetic flux that does not interlink with the magnet, it becomes a useless magnetic flux that does not contribute to the force. Therefore, there is a drawback that the magnetic utilization efficiency of the magnetic circuit is low. Further, since magnetic flux in the opposite direction is generated by adjacent magnetic poles, it is necessary to complicate the armature core and arrange the armature winding at a position away from the magnet facing portion.</p><p> The present invention has been made to solve these drawbacks, and an object of the present invention is to provide a structure capable of generating a high thrust force.</p>

<p> In order to achieve the above object, the present invention is a thrust generating mechanism in which an armature composed of an armature core and windings and a mover having a permanent magnet can move relatively, and the armature core is It is provided with magnetic pole teeth arranged to face each other on the magnetic pole side of the permanent magnet via a gap, and a core connecting the magnetic pole teeth, and has a plurality of the armature cores, and the plurality of armature cores have the same polarity. It is characterized by having.</p><p> Further, in order to achieve the above object, the present invention is a thrust generating mechanism in which an armature composed of an armature core and windings and a mover having a permanent magnet can be relatively moved, and a plurality of armatures are generated. The armature core, the armature core provided with magnetic pole teeth arranged to face each other on the magnetic pole side of the permanent magnet via a gap, and a core connecting the magnetic pole teeth, and a plurality of armature cores with respect to the magnetic pole pitch P of the mover. The armature core is 2nP (n is an integer, n = 1,2,3 ...), And the plurality of armature cores have the same polarity.</p><p> Further, in order to achieve the above object, the present invention is a thrust generating mechanism in which an armature composed of an armature core and windings and a mover having a permanent magnet can be relatively moved, and a plurality of armatures are generated. The armature core is provided, and the armature core is provided with magnetic pole teeth arranged to face each other on the magnetic pole side of a permanent magnet via a gap, and a core connecting the magnetic pole teeth, and a plurality of armature cores are provided with respect to the magnetic pole pitch P of the mover. The pitch of the armature cores is 2nP ± P / 2m (n is an integer, n = 1,2,3 ..., M is the number of phases M = 1,2,3 ...). The armature core is characterized by having the same polarity.</p><p> Further, in order to achieve the above object, the present invention is a thrust generating mechanism in which an armature composed of an armature core and windings and a mover having a permanent magnet can move relatively, and the armature is described. The iron core is provided with magnetic pole teeth arranged to face each other on the magnetic pole side of the permanent magnet via a gap, and a core connecting the magnetic pole teeth, and has a plurality of the armature cores, and the magnetic fluxes of the adjacent armature cores. It is characterized in that the directions are the same.</p><p> Further, in order to achieve the above object, the present invention is a thrust generating mechanism in which an armature composed of an armature core and windings and a mover having a permanent magnet can move relatively, and the armature is described. A magnetic pole tooth whose iron core is arranged to face each other on the magnetic pole side of a permanent magnet via a gap and a core connecting the magnetic pole teeth, and having a plurality of the armature cores, and the plurality of armature cores are the same. Having polarity, the thickness t of the armature core in the longitudinal direction of the mover is P t with respect to the magnetic pole pitch P of the mover, and the plurality of armature cores have the same polarity. It is a feature.</p><p> Further, in order to achieve the above object, the present invention is a thrust generating mechanism in which an armature composed of an armature core and windings and a mover having a permanent magnet can move relatively, and the armature is described. The iron core is provided with magnetic pole teeth arranged to face each other on the magnetic pole side of the permanent magnet via a gap, and a core connecting the magnetic pole teeth, and has a plurality of the armature cores, with respect to the magnetic pole pitch P of the mover. It is characterized in that the cores arranged opposite to an arbitrary winding current in a gap in the range of 2P generate a magnet in the same direction in the gap.</p><p> Further, in order to achieve the above object, the present invention is a thrust generating mechanism in which an armature composed of an armature core and windings and a mover having a permanent magnet can move relatively, and the armature is described. The iron core includes magnetic pole teeth arranged to face each other on the magnetic pole side of the permanent magnet via a gap, and a core connecting the magnetic pole teeth, and at an arbitrary winding current, the plurality of armature cores are the same with respect to the gap. It is characterized in that magnetic fluxes in the same direction are generated.</p><p> Further, in order to achieve the above object, the present invention is a thrust generating mechanism in which an armature composed of an armature core and windings and a mover having a permanent magnet can move relatively, and the armature is described. The iron core is provided with magnetic pole teeth arranged opposite to each other on the magnetic pole side of the permanent magnet via a gap, and a core connecting the magnetic pole teeth. On the other hand, the armature is characterized in that the polarity generated in the void is one polarity.</p><p> Further, the thrust generation mechanism of the present invention is characterized in that a common winding is wound around the plurality of armature cores.</p><p> Further, the thrust generation mechanism of the present invention is characterized in that the armature windings are arranged on the magnetic pole teeth arranged to face each other on both sides of the magnetic pole side of the permanent magnet.</p><p> Further, the thrust generation mechanism of the present invention is characterized in that the magnetic pole teeth arranged to face each other on both sides of the magnetic pole side of the permanent magnet are tapered toward the magnet.</p><p> Further, the thrust generation mechanism of the present invention is characterized in that the magnet facing surfaces of the magnetic pole teeth arranged to face each other on both sides of the magnetic pole side of the permanent magnet are cut out.</p><p> Further, the thrust generating mechanism of the present invention is a thrust generating mechanism having a unit composed of a plurality of armatures as one phase and having a plurality of phases, and the plurality of adjacent thrust generating mechanisms with respect to the pitch P of the magnetic poles. The pitch between each phase of the phase consisting of armatures is (kP + P / M) (k = 0,1,2,3 ..., M is the number of phases M = 1,2,3 ...) It is characterized by doing.</p><p> Further, the present invention is to provide a linear motor having the thrust generation mechanism described above.</p>

<p> According to the present invention, it is possible to provide a highly efficient thrust generation mechanism with reduced leakage flux.</p><p> Further, according to the present invention, it is also possible to provide a linear motor using a highly efficient thrust generation mechanism.</p>

[Embodiment 1 of the invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a thrust generation mechanism according to an embodiment of the present invention. A cross-sectional view of the YZ plane of the thrust generation mechanism is shown in FIG. 2, and a cross-sectional view of the XY plane is shown in FIG. In FIGS. 1 to 3, the armature core unit 100 includes an upper magnetic pole tooth 11 facing the magnet, a lower magnetic pole tooth 12 facing the magnet, an upper magnetic pole tooth 11 and a lower magnetic pole tooth 12. It is composed of an armature iron core 1 that connects the two. The upper magnetic pole tooth 11 and the lower magnetic pole tooth 12 are arranged to face each other with the gap 4 interposed therebetween, and the magnet row 3 is inserted into the gap 4. The magnet row 3 is arranged such that a rectangular magnet has a pitch P and a surface facing the magnetic pole teeth is a magnetic pole surface, and the magnetic poles are alternately arranged by adjacent magnets. Further, the armature core having the same shape as the armature core unit 100 is arranged so that the pitch of the magnet with respect to the pitch P of the magnet is 2P with respect to the pitch P of the armature core unit 100.

The armature unit 200 has a configuration in which armature windings 2 are arranged so as to be common to a plurality of armature core units 100. In addition, the armature unit is made by applying the same armature winding to multiple armature cores, and it is possible to wind the armature winding around all of them regardless of the number of armature cores. is there.

In the above configuration, when a current is supplied to the armature winding 2, a magnetic flux is generated in the gap 4. A force is generated in the magnet array in the interaction between this magnetic flux and the magnetic flux of the magnet. The magnetic flux of the armature core is shown in Fig. 4. On the other hand, magnetic flux is generated in the same direction in the adjacent armature cores. At this time, since the directions of the magnetic fluxes of the adjacent armature cores are substantially the same, the leakage flux between the armature cores can be reduced.

Further, since the directions of the magnetic fluxes of the plurality of armature cores are substantially the same, the armature windings can be arranged regardless of the location of the armature cores. Figure 5 shows an example of the arrangement of armature windings. Since the position of the armature winding is not limited, the degree of freedom in arranging the armature winding is improved. Therefore, even when a support mechanism or cooling structure for the mover is required, the support mechanism or cooling structure for the mover can be arranged without being affected by the position of the armature winding. Further, as shown in FIG. 5A, since the direction of the magnetic flux of the magnetic pole teeth is also the same, the armature winding can be arranged at the opposite portion of the magnet, and a magnetic circuit configuration having a good magnetic flux utilization rate becomes possible. ..

As shown in FIG. 6, since the polarities of the armature cores are substantially the same, it is possible to narrow the distance between the armature cores. In that case, thrust can be generated by narrowing the upper magnetic pole tooth 11 and the lower magnetic pole tooth 12 toward the magnet. The pitch of the plurality of armature cores is 2P in FIG. 6, but may be 2nP. Further, even when the space between the armatures is eliminated, the same effect can be obtained because the directions of the magnetic fluxes of the plurality of armature cores are the same.

The armature core can also be manufactured by laminating steel plates. Figure 7 (a) shows an armature core made of laminated steel plates. A cross-sectional view of the YZ plane of FIG. 7 (a) is shown in FIG. 7 (b). By changing the shape of the tip, it is possible to change the characteristics of the generated force. An example in which the tip shape is changed is shown in Fig. 7 (c).

Further, as shown in FIG. 8, when the magnetic pole pitch is 2 nP ± P / 2 m, it is possible to reduce the pulsating component of the force (torque) by shifting the pitch within the range of ± P / 2 m. .. In this case as well, the same effect as that shown in FIG. 1 can be obtained.

In the thrust generation mechanism of the present invention, the directions of the magnetic fluxes of the plurality of armature cores are substantially the same, and the distance between the adjacent armature cores can be reduced. When the pitch of the armature core is 2P with respect to the magnet pitch P, the thickness t of the armature core can be 0 &lt;t &lt;= 2P. At this time, by making the magnetic pole teeth facing the magnet tapered toward the magnet, it becomes possible to concentrate the magnetic flux, and a larger force can be obtained. An example of the shape of the magnetic pole teeth is shown in FIG. Further, since the pulsation of the magnetic flux can be reduced by forming the tapered shape, the pulsation of the thrust can also be reduced.

A thrust generator configured by arranging the armature units of the present invention in series or in parallel will be described. FIG. 10 shows an armature core unit 100 in which three armature cores 1 are arranged in parallel, and an armature winding 2 is installed in a core facing a magnet. FIG. 11 shows this cross-sectional view.

Regarding the positional relationship between the armature core unit 100 and the armature unit 101, the distance between the adjacent cores of the armature core unit 100 and the armature unit 101 is (kP + P / M) (k = 0,1,2,3., M = 1,2,3, ). The embodiment shown in FIG. 10 shows a case of a three-phase configuration in which three units are configured as one. In each phase unit, the distance between adjacent armatures is (kP + P / M).

The distance between the armature core unit 100 and the armature unit 101 shown in FIGS. 10 and 11 is (kP + 2P / M) (k = 0,1,2,3 ..., M = 1,2). , 3, ...), The armature unit of the present invention can be configured.

[Embodiment 2 of the Invention] A second embodiment of the present invention is shown in FIGS. 12 and later.

The present invention has a structure in which magnetic pole teeth are arranged so as to face the upper and lower surfaces of a magnet and have a core connecting the upper and lower magnetic pole teeth. The permanent magnet 203 is sandwiched between the upper magnetic pole tooth 211 and the lower magnetic pole tooth 212 with a gap. The magnetic flux path is formed by the upper magnetic pole tooth 211, the lower magnetic pole tooth 212, and the iron core 201. A plurality of armature cores 301 composed of an iron core 201, an upper magnetic pole tooth 211, and a lower magnetic pole tooth 212 are arranged side by side. A common winding 202 is arranged on a plurality of armature cores. Although the number of armature cores shown in FIG. 12 is two, it can be configured in the same manner even if the number of armature cores increases. Then, the armature unit is configured as a whole in FIG.

Since the directions of the magnetic fluxes of the armature cores are substantially the same, it is possible to insert an auxiliary core between a plurality of armature cores. The shape explanatory diagram is shown in FIG. A plurality of armature cores 301 composed of an iron core 201, an upper magnetic pole tooth 211, and a lower magnetic pole tooth 212 are arranged side by side, and an auxiliary core 204 is inserted between the plurality of armature cores. By doing so, it is possible to widen the cross-sectional area of the iron core which is the path of the magnetic flux.

If the upper magnetic pole teeth and the lower magnetic pole teeth are configured to be tapered toward the magnet, the pulsation of the generated force can be reduced as shown in FIG. Further, the pulsation can be further reduced by tilting the magnet with respect to the magnetic pole teeth.

When the upper magnetic pole teeth and the lower magnetic pole teeth are configured to be thinner toward the magnet, as shown in FIG. 15, the distance between the armature cores can be narrowed or the armature cores can be configured in contact with each other, enabling miniaturization. Become.

In the configuration shown in the second embodiment, since one side of the magnet row is not covered by the armature iron core, the other structure can be arranged on the side surface of the magnet row. Further, as in the first embodiment, a plurality of armature units as shown in FIG. 12 are arranged, and (kP + P / M) or (kP + 2P / M) (k = 0,1,2,3. By setting the interval to M = 1,2,3, ...), a linear motor driven by an M-phase power supply can be configured.

FIG. 16 shows another embodiment of the present invention.

Figure 16 shows an example in which an armature unit is configured with three armature iron cores and a three-phase linear motor is configured with three armature units. Then, one side of the coil is cut out in a vertical cross section in the relative moving direction so that the structure of the magnet portion can be understood. As an embodiment of the present invention, it is also possible to fix the magnet row side as a mover and move the armature unit side.

When a current is passed through the winding wound around the armature core of the present invention, the armature magnetic flux created in the gap by the armature changes as the current value changes. When a constant direct current is applied to the armature, the armature magnetic flux generated in the void in the 2P region has one polarity. FIG. 17 shows the distribution of the armature magnetic flux Bc at the moment when a constant current value is applied to the winding. Depending on the configuration of the armature, the armature magnetic flux may be small or in the opposite direction at the end of the 2P region, but it has a characteristic of having substantially one polarity.

Next, FIG. 18 shows the distribution of the magnetic flux produced by the magnet and the magnetic flux produced by the armature when a current is passed through the winding wound around the armature core. There are two magnets in the void region of the armature core 2P. The armature magnetic flux Bc generated in the void at a certain current value when a current is applied to the armature winding has one polarity as shown in the upper part of FIG. On the other hand, the magnetic flux Bm created by the magnet in the void has two polarities, as shown in the lower part of FIG.

Further, when a plurality of armatures are arranged side by side and a direct current is applied to the windings of the armatures, the distribution of the armature magnetic flux Bc is as shown in FIG. The magnetic flux generated by the plurality of armatures in the voids has substantially one polarity.

In these configurations, shown in FIGS. 17-19, forces are generated by interaction with magnets of two polarities. In either case, since the armature has only one polarity, interference between the magnetic phases of the armatures can be reduced. When the positive and negative currents are exchanged, the directions of the armature magnetic flux are also exchanged and have opposite polarities, but even in that case, they have approximately one polarity.

Further, the armature unit of the present invention can be rearranged with respect to the magnet train. In order to effectively arrange the occupied range of the winding, as shown in FIG. 20, the space between the armature units can be effectively used by arranging the units alternately with respect to the magnet train. FIG. 20 (a) shows a perspective view of an example of unit arrangement, and FIG. 20 (b) shows a top view.

As shown in FIG. 21, the armature unit can reduce the occupied space between the units by forming the armature core in a triangular shape along the surface of the magnet. FIG. 21 (a) shows a perspective view of an example of unit arrangement when the armature core is triangular when viewed from above, and FIG. 21 (b) shows a top view thereof.

Further, as shown in FIG. 22, a structure in which the magnet rows are sandwiched from both sides is also possible. A perspective view of an example of a configuration sandwiched from both sides is shown in FIG. 22 (a), and a top view is shown in FIG. 22 (b).

As shown in FIG. 23, the magnet can be made into a round shape and the mover can be made into an axial shape. Further, as shown in FIGS. 24 (a) and 24 (b), the magnets can be arranged so that the poles face each other or the distance between the magnets is narrowed.

Further, although the linear motor has been described as an embodiment of the thrust generation mechanism of the present invention, it can also be used as a vibrating linear actuator in which the mover relatively reciprocates by supplying an alternating current to the winding of the armature unit. It is available.

In the embodiment of the present invention, the magnets are arranged linearly and described as a linear motor, but if the magnets are arranged in an arc shape, it can be driven as a rotary electric machine. At that time, the magnet rows can be arranged in a disk shape or a cylindrical shape.

Further, in the above-described embodiment, a configuration in which armature cores having the same shape are combined is described, but it is possible not to use armature cores having the same shape as long as the same function can be achieved.

Further, although a plurality of armatures are individually described in the above-described embodiment, the same effect can be obtained even if the plurality of armatures are integrally configured.

The thrust generating mechanism or linear motor of the present invention can be used in place of the conventionally used thrust generating mechanism or linear motor.

<figref num="1">A thrust generation mechanism according to an embodiment of the present invention is shown.</figref><figref num="2">The cross-sectional view of the YZ plane of the thrust generation mechanism of FIG. 1 is shown.</figref><figref num="3">The cross-sectional view of the XY plane of the thrust generation mechanism of FIG. 1 is shown.</figref><figref num="4">Shows the magnetic flux of the armature core.</figref><figref num="5">An example of arrangement of armature windings is shown.</figref><figref num="6">An example in which the distance between the electron cores is narrowed is shown.</figref><figref num="7">An armature iron core composed of a laminated steel plate is shown.</figref><figref num="8">A modified example of the pitch of the magnetic poles is shown.</figref><figref num="9">An example of the shape of the magnetic pole teeth is shown.</figref><figref num="10">The armature core unit in which three armature cores are arranged in parallel is shown.</figref><figref num="11">A cross-sectional view of FIG. 10 is shown.</figref><figref num="12">An example of another thrust generation mechanism according to the embodiment of the present invention is shown.</figref><figref num="13">An example in which an auxiliary core is inserted between a plurality of armature cores is shown.</figref><figref num="14">An example is shown in which the upper magnetic pole teeth and the lower magnetic pole teeth are configured to be tapered toward the magnet.</figref><figref num="15">An example in which the distance between the armature cores is narrowed is shown.</figref><figref num="16">Other examples of the present invention are shown.</figref><figref num="17">The distribution of armature magnetic flux is shown.</figref><figref num="18">The distribution of the magnetic flux produced by the magnet and the magnetic flux produced by the armature is shown.</figref><figref num="19">The distribution of magnetic flux when a plurality of armatures are arranged is shown.</figref><figref num="20">An example in which armature units are arranged alternately is shown.</figref><figref num="21">An example in which the armature core is triangular is shown.</figref><figref num="22">The structure is shown in which the armature core sandwiches the magnet array from both sides.</figref><figref num="23">The structure in which the magnet train is rounded is shown.</figref><figref num="24">A modified example of the arrangement of magnets is shown.</figref>

Code description

1 Armature iron core 3 magnet row 4 voids 11,12 magnetic pole teeth 100 armature core unit 200 armature unit