JP6763312B2 - Rotating electric machine - Google Patents

Description

The present invention relates to a rotary electric machine, particularly to a rotary electric machine including two stators and a rotor.

Conventionally, a structure has been known in a rotary electric machine for the purpose of being able to handle a wide range of rotation speeds. Patent Document 1 describes a rotary electric machine including a first stator and a second stator in which the stator is arranged at two positions different from each other in the axial direction facing the rotor. In this rotary electric machine, each stator is divided into an inner peripheral side stator and an outer peripheral side stator. The inner peripheral side stator can move in the circumferential direction with respect to the outer peripheral side stator. In the inner peripheral side stator, a plurality of teeth are integrated by a connecting ring, and a coil is wound around each tooth. The outer peripheral side stator corresponds to a yoke, and includes a convex portion that moves in contact with the teeth and a concave portion between adjacent convex portions. The coils of each stator are connected in series or in parallel. It is said that it can be used in a wide speed range because the maximum voltage generated by the rotating electric machine can be suppressed by increasing the relative angle between the two inner peripheral side stators as the rotating speed of the rotating electric machine increases. There is.

Patent Document 2 includes a rotary electric machine including an outer stator arranged on the outer diameter side of the rotor and an inner stator arranged on the inner diameter side of the rotor, and each of the outer stator and the inner stator is provided with the same number of coils. Are listed. Each coil is connected to an external control device so that a three-phase current is supplied from the control device to the coils of the outer stator and the inner stator separately in terms of energization amount and phase. At this time, it is said that the rotor outputs a high torque in the low speed rotation range by energizing both stators so as to pass currents having the same phase. Further, by changing the energizing current and the phase of both stators, the number of interlinkage magnetic fluxes in the stators that mainly generate torque among the outer and inner stators is reduced, so that the induced voltage generated in the stators is reduced. It is said that the rotor can be rotated at high speed by suppressing the rise.

Japanese Unexamined Patent Publication No. 2005-57940 JP-A-2014-220884

In the configuration described in Patent Document 1, the magnetic resistance of the inner peripheral side stator having the coil is only controlled, and the amount of magnetic flux interlinking with the coil is not directly controlled. As a result, the control range of the amount of magnetic flux interlinking with each coil is narrow. Therefore, in the configuration described in Patent Document 1, the effect of reducing the amount of interlinkage magnetic flux of the coil is low, and the effect of increasing the upper limit speed, which is high-speed rotation, is also low.

In the configuration described in Patent Document 2, the effect obtained by changing the phase of the current flowing through the coil between the inner stator and the outer stator in order to achieve high-speed rotation is the effect obtained by the conventionally known weakening field control. Equivalent. As a result, there is room for improvement in the effect of high-speed rotation. Further, since it is necessary to provide a plurality of power converters such as inverters in the control device, the cost required for control may increase excessively.

An object of the rotary electric machine of the present invention is to prevent an excessive increase in the cost required for control and to increase the upper limit speed at high speed rotation.

The rotary electric motor of the present invention includes an inner stator including a three-phase inner coil, an outer stator including a three-phase outer coil arranged adjacent to each other on the radial outer side of the inner stator, and the inner stator or the outer stator. The one-side rotor includes a first magnet arranged at a plurality of positions in the circumferential direction, and one of the inner stator and the outer stator is provided with a one-side rotor arranged apart from each other in the radial direction. It is movable in the circumferential direction, the other stator cannot move in the circumferential direction, and the one stator is displaced in the circumferential direction with respect to the other stator, so that the inner coil and the outer coil in the same phase can be moved. The other-side rotor is configured to control the amount of interlinking magnetic flux , and includes the other-side rotor which is arranged apart from the outer stator or the inner stator on the other side in the radial direction and rotates in synchronization with the one-side rotor. Includes second magnets arranged at a plurality of positions in the circumferential direction, the outer stator is formed on a resin-made cylindrical outer main body portion and the outer main body portion, and the outer protrusion is wound around the outer coil. The inner stator has a cylindrical inner main body made of resin and an inner protrusion formed on the inner main body and around which the inner coil is wound, and is inside the outer main body. The inner main body is arranged without a gap, the inner stator is slidable with respect to the outer stator, and one of the stators is fixed to the motor connecting portion fixed to the motor shaft by cantilever support. The other stator is fixed to the case.

According to the rotary electric machine of the present invention, it is possible to prevent an excessive increase in the cost required for control and to increase the upper limit speed at high speed rotation.

It is sectional drawing about the plane including the central axis in the rotary electric machine of embodiment. FIG. 5 is a cross-sectional equivalent view taken along the line AA of FIG. 1 in a part of the circumferential direction when the phase difference between the inner stator and the outer stator is 0 in the rotary electric machine of the embodiment. In the rotary electric machine of the embodiment, the relationship between the electric angle of each rotor and the magnetic flux interlinking with the coil having the same phase is shown by changing the phase difference between the inner stator and the outer stator. In the rotary electric machine of the embodiment, it is assumed that the outer stator is movable and the inner stator is immovable, and the phase difference between the inner stator and the outer stator is 30 degrees in terms of electric angle. It is a corresponding figure. In the rotary electric machine of the embodiment, it is assumed that the outer stator is movable and the inner stator is immovable, and the phase difference between the inner stator and the outer stator is 60 degrees in terms of electric angle. It is a corresponding figure. In the rotary electric machine of the embodiment, it is assumed that the outer stator is movable and the inner stator is immovable, and the phase difference between the inner stator and the outer stator is 90 degrees in terms of electric angle. It is a corresponding figure. In the rotary electric machine of the embodiment, the relationship between the rotation speed of each rotor and the torque of the rotary electric machine is shown by changing the phase difference between the inner stator and the outer stator. In another example of the rotary electric machine of the embodiment, it is a figure corresponding to the AA cross section of FIG. 1 in a part in the circumferential direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, the equivalent elements will be described with the same reference numerals in all the drawings.

FIG. 1 is a cross-sectional view of a plane including the central axis O in the rotary electric machine 10 of the embodiment. FIG. 2 is a cross-sectional equivalent view taken along the line AA of FIG. 1 in a part of the circumferential direction when the phase difference between the inner stator 12 and the outer stator 20 is 0 in the rotary electric machine 10. The rotary electric machine 10 includes an inner stator 12, an outer stator 20, an inner rotor 30, and an outer rotor 40.

The rotary electric machine 10 is a permanent magnet type synchronous motor driven by a three-phase alternating current. The rotary electric machine 10 is used as a motor for driving an electric vehicle, a hybrid vehicle, a fuel cell vehicle, a generator, or a motor generator having both functions.

The inner stator 12, the outer stator 20, the inner rotor 30, and the outer rotor 40 are supported by the case in a state of being arranged inside the case (not shown) so that their respective central axes O coincide with each other.

As shown in FIG. 1, the inner stator 12 includes an inner coil support portion 13 which is substantially cylindrical, a motor connecting portion 16, and an inner coil 19 having three phases of U phase, V phase, and W phase. The inner coil support portion 13 has a cylindrical main body portion 14 and a rectangular plate-shaped protrusion 15 formed so as to protrude inward in the radial direction from a plurality of positions in the circumferential direction on the inner peripheral surface of the main body portion 14. It is integrally formed of resin. An inner coil 19 described later is wound around the protrusion 15.

The motor connecting portion 16 has a disc portion 17 and a shaft portion 18 coupled to one end in the axial direction (right end in FIG. 1) of the disc portion 17. The disk portion 17 is formed with a circular recess 17a at the center of the other side surface in the axial direction (left side surface in FIG. 1). One end of the shaft portion 18 is fixed to the motor shaft 51 of the stator rotation motor 50 so that the central shafts O coincide with each other. The stator rotation motor 50 has a motor case 50a fixed to a case and a motor shaft 51 supported inside the motor case 50a, and the inner stator 12 is rotated by the rotation of the motor shaft 51. The inner stator 12 corresponds to one stator that can move in the circumferential direction. The rotation of the stator rotation motor 50 is controlled by an external control device (not shown). As the stator rotation motor 50, for example, a servo motor is used.

The three-phase inner coil 19 is wound around a plurality of protrusions 15 included in the inner coil support portion 13 in a concentrated winding manner. In this state, as shown in FIG. 2, the U-phase, V-phase, and W-phase inner coils 19 are sequentially arranged at equal intervals along the circumferential direction of the inner stator 12. In FIG. 2, the symbols U +, V +, and W + of the inner coil 19 constitute the inner coil 19 of the U phase, the V phase, and the W phase, and each of the plurality of conducting wires extending in the direction orthogonal to the paper surface is on the paper surface. It shows that the current flows from the back side to the front side. In FIG. 2, the symbols U-, V-, and W- of the inner coil 19 indicate that current flows from the front side to the back side of the paper surface in each of the plurality of conducting wires in the inner coil 19 of the U phase, V phase, and W phase. It is shown that. Since the non-magnetic resin protrusion 15 is arranged inside the inner coil 19, the inner coil 19 becomes an air-core coil. Further, a resin protrusion 15 is also arranged between the inner coils 19 of different phases adjacent to each other. This makes it possible to increase the insulation between the inner coils 19 of different phases.

As shown in FIG. 1, the outer stator 20 includes an outer coil support portion 21 having a substantially cylindrical shape, and an outer coil 25 having three phases of U phase, V phase, and W phase. The outer coil support portion 21 has a cylindrical main body portion 22 and a rectangular plate-shaped protrusion 23 formed so as to protrude outward in the radial direction from a plurality of positions in the circumferential direction on the outer peripheral surface of the main body portion 22, and is made of resin. Is integrally formed by. An outer coil 25 is wound around the protrusion 23. Further, the outer coil support portion 21 is fixed to the case (not shown) via a fixing member (not shown). The outer stator 20 corresponds to the other stator that cannot move in the circumferential direction.

The three-phase outer coil 25 is wound around a plurality of protrusions 23 of the outer coil support portion 21 in a concentrated winding manner. In this state, as shown in FIG. 2, the U-phase, V-phase, and W-phase outer coils 25 are sequentially arranged at equal intervals along the circumferential direction of the outer stator 20. In FIG. 2, the symbols U +, V +, and W + of the outer coil 25 constitute the outer coil 25 of the U phase, V phase, and W phase, and each of the plurality of conducting wires extending in the direction orthogonal to the paper surface is on the paper surface. It shows that the current flows from the back side to the front side. In FIG. 2, the symbols U-, V-, and W- of the outer coil 25 indicate that current flows from the front side to the back side of the paper surface in each of the plurality of conducting wires in the U-phase, V-phase, and W-phase outer coils 25. It is shown that. Since the non-magnetic resin protrusion 23 is arranged inside the outer coil 25, the outer coil 25 is also an air-core coil like the inner coil 19. Further, a resin protrusion 23 is also arranged between the outer coils 25 of adjacent different phases. The inner protrusions of the inner coil 19 and the outer coil 25 may be omitted.

The three-phase outer coil 25 and the three-phase inner coil 19 are connected in series or in parallel in phase. For example, the three-phase outer coil 25 and the three-phase inner coil 19 are connected by a double star connection, which is a form in which two are connected in parallel in the same phase. The U-phase outer coil 25 and the inner coil 19 are connected to the U-phase output terminal of a common inverter (not shown) via a power line (not shown). The V-phase and W-phase outer coils 25 and inner coils 19 are also connected to the V-phase and W-phase output terminals of a common inverter via a power line.

As shown in FIG. 1, the outer stator 20 is arranged radially outside the inner coil support portion 13 and the inner coil 19 of the inner stator 12. At this time, the resin main body 14 of the inner stator 12 is arranged inside the resin main body 22 of the outer stator 20 with almost no gap. As a result, the inner stator 12 is slidable with respect to the outer stator 20.

Further, the rotatable inner rotor 30 and the outer rotor 40 are integrally coupled. Specifically, the inner rotor 30 is a rotor core 31 formed of a cylindrical magnetic material such as iron or steel, and permanent magnets arranged side by side at a plurality of positions at equal intervals in the circumferential direction of the cylindrical outer peripheral surface of the rotor core 31. The first magnet 32 is included. The first magnet 32 is magnetized in the radial direction of the inner rotor 30, and the magnetization directions of the first magnet 32 are reversed between the adjacent first magnets 32.

The inner rotor 30 is fixed to the rotor support member 60 described later together with the outer rotor 40 described later.

The outer rotor 40 is a rotor core 41 formed of a cylindrical magnetic material such as iron or steel, and a second magnet 42 which is a permanent magnet embedded at a plurality of positions at equal intervals in the circumferential direction of the inner peripheral surface of the rotor core 41. And include. The second magnet 42 is magnetized in the radial direction of the outer rotor 40, and the magnetization directions of the second magnet 42 are reversed by the adjacent second magnets 42. In FIG. 2, arrows α and β indicate the magnetic flux directions of the first magnet 32 and the second magnet 42. The first magnet 32 of the inner rotor 30 and the second magnet 42 of the outer rotor 40 are arranged in the same phase in the radial direction.

As shown in FIG. 1, the rotor support member 60 is a member for fixing the inner rotor 30 and the outer rotor 40. The rotor support member 60 includes a first shaft portion 61, a disc portion 62 connected to the first shaft portion 61, a tubular portion 63, and a second shaft portion 64. One end of the first shaft portion 61 in the axial direction is connected to the central portion of the other side surface (left side surface in FIG. 1) of the disc portion 62 in the axial direction. The tubular portion 63 projects in the axial direction from the peripheral edge portion of one side surface (right side surface in FIG. 1) in the axial direction of the disk portion 62. The second shaft portion 64 projects in the axial direction from the center of one side surface of the disc portion in the axial direction.

The first shaft portion 61 is rotatably supported by a bearing (not shown) with respect to the case. A small diameter shaft portion 64a having a smaller diameter is formed on one side of the second shaft portion 64 in the axial direction. One end of the small diameter shaft portion 64a is rotatably supported in the recess 17a of the disk portion 17 of the motor connecting portion 16 via the bearing B. Further, the inner rotor 30 is fitted and fixed to the small diameter shaft portion 64a. In this state, the inner rotor 30 is arranged on the inner side in the radial direction, which is one side of the inner coil support portion 13 and the inner coil 19 in the radial direction, apart from each other through a gap. The inner rotor 30 corresponds to the one-side rotor.

On the other hand, the other end in the axial direction of the outer rotor 40 (the left end in FIG. 1) is fixed to one end in the axial direction of the tubular portion 63 constituting the rotor support member 60. In this state, the outer rotor 40 is arranged apart from each other via a gap on the outer side in the radial direction, which is the other side in the radial direction of the outer coil support portion 21 and the outer coil 25. The outer rotor 40 corresponds to the other rotor. The inner rotor 30 and the outer rotor 40 are fixed to the rotor support member 60 with their central axes aligned with each other. As a result, the outer rotor 40 rotates in synchronization with the inner rotor 30.

The rotation of the stator rotation motor 50 changes the phase difference between the inner stator 12 and the outer stator 20 in the circumferential direction. Then, the rotary electric machine 10 is configured to be able to control the amount of magnetic flux interlinking with the inner coil 19 and the outer coil 25 having the same phase by shifting the inner stator 12 in the circumferential direction with respect to the outer stator 20. Specifically, as shown in FIG. 2, consider a case where the phase difference between the inner stator 12 and the outer stator 20 is set to 0, and the circumferential positions of the inner coil 19 and the outer coil 25 having the same phase match. In this case, as the amount of magnetic flux interlinking the inner and outer coils 19 and 25 of the same phase, for example, the maximum value of the interlinkage magnetic flux, that is, the amplitude of the interlinkage magnetic flux becomes the maximum. On the other hand, as shown in FIGS. 4 to 6, when the phase difference between the inner stator 12 and the outer stator 20 is gradually increased to 30 degrees, 60 degrees, and 90 degrees in terms of electrical angles, the inside of the same phase is correspondingly increased. The amount of magnetic flux interlinking the coil 19 and the outer coil 25, for example, its maximum value, decreases.

4 to 6 show the positional relationship between the inner stator 12 and the outer stator 20 when it is assumed that the outer stator 20 is movable and the inner stator 12 is immovable in the embodiments of FIGS. 1 and 2. There is. In the configuration of FIGS. 4 to 6, the effect of increasing the phase difference between the inner stator 12 and the outer stator 20 is that the outer stator 20 cannot be moved and the inner stator 12 is as in the embodiments of FIGS. 1 and 2. It is the same as the effect when is made movable.

FIG. 3 shows the magnetic flux (Wb / number of turns (Turn)) interlinking with the inner and outer coils 19 and 25 in phase with the electric angle (deg) in the rotation of the rotors 30 and 40 in the rotary electric machine 10 of the embodiment. It is a figure which shows the relationship of by changing the phase difference D between an inner stator and an outer stator. In FIG. 3, the thin solid line L1 is the case where the phase difference D is 0, the thin broken line L2 is the case where the phase difference D is 30 degrees in the electric angle, and the thin alternate long and short dash line L3 is the case where the phase difference D is 60 degrees in the electric angle. This is the case. Similarly, the thick solid line L4 is the case where the phase difference D is 90 degrees in the electric angle, and the thick alternate long and short dash line L5 is the case where the phase difference D is 120 degrees in the electric angle. FIG. 3 shows the result calculated by the simulation. As can be understood from the results shown in FIG. 3, by shifting the phases of the inner stator and the outer stator, the phases of the magnetic flux interlinking the inner and outer coils 19 and 25 of the same phase are also shifted. Further, when the inner stator 12 and the outer stator 20 are out of phase, the amount of magnetic flux interlinking with the coils 19 and 25 having the same phase changes when the rotation positions of the rotors 30 and 40 are the same. Further, when the phase of the inner stator 12 and the outer stator 20 is deviated, the larger the disagreement, for example, the more the phase changes in the order of L1, L2 ... The maximum value (amplitude) of the amount of magnetic flux intersecting decreases.

FIG. 7 shows the relationship between the rotation speed (min ^-1 ) of the rotors 30 and 40 per unit time and the torque (Nm) of the rotary electric machine 10 in the rotary electric machine 10 of the embodiment between the inner stator 12 and the outer stator 20. It is a figure which shows by changing the phase difference D with. In FIG. 7, the thin solid line M1 is the case where the phase difference D is 0, the thin broken line M2 is the case where the phase difference D is 30 degrees in the electric angle, and the thin alternate long and short dash line M3 is the case where the phase difference D is 60 degrees in the electric angle. This is the case. Similarly, the thick solid line M4 is the case where the phase difference D is 90 degrees in the electric angle, and the thick alternate long and short dash line M5 is the case where the phase difference D is 120 degrees in the electric angle. FIG. 7 shows the result calculated by the simulation. From the results shown in FIG. 7, as the phase difference D between the inner stator 12 and the outer stator 20 is increased, the maximum torque of the rotary electric machine 10 is reduced, but instead, the rotation speed per unit time can be increased and the speed is increased. It can be seen that the upper limit speed in rotation can be increased.

As described above, according to the rotary electric machine 10 of the embodiment, the upper limit speed at high speed rotation can be increased. Moreover, it is not necessary to use a plurality of inverters to control the rotary electric machine 10 to change the phase of the current flowing through the inner coil 19 and the outer coil 25. Therefore, it is possible to prevent an excessive increase in the cost required for controlling the rotary electric machine 10.

Further, since the inner coil 19 and the outer coil 25 are air-core coils having no magnetic core on the inside, the inductance is small and the coil has a small inductance, unlike the case where the coil has the magnetic core on the inside. Even if the energizing current is increased, the degree of increase in the amount of magnetic flux is low. As a result, in the dq-axis vector control of the current command during high-speed rotation, the upper limit of the rotation speed of the rotor is performed when the field weakening control for changing the current phase is performed so as to weaken the magnetic flux in the d-axis direction, which is the magnetic flux direction of the magnet. The effect of increasing the value is low. On the other hand, according to the configuration in which the phase difference between the inner stator and the outer stator is changed as in the embodiment, it is easy to increase the upper limit of the rotation speed at the time of high-speed rotation. As a result, the effect of increasing the upper limit of the rotation speed becomes remarkable when the air core coil is provided.

Further, in the configurations of FIGS. 1 and 2, the inner rotor 30 and the outer rotor 40 are provided on both sides of the inner stator 12 and the outer stator 20 in the radial direction. As a result, the amount of magnetic flux interlinking with the inner coil 19 and the outer coil 25 having the same phase can be increased, so that the torque of the rotary electric machine 10 can be improved.

FIG. 8 is a diagram corresponding to the AA cross section of FIG. 1 in a part in the circumferential direction in another example of the rotary electric machine 10a of the embodiment. In the case of the embodiment shown in FIGS. 1 and 2, the case where the inner coil 19 and the outer coil 25 are centrally wound has been described. On the other hand, in the case of another configuration shown in FIG. 8, the inner coil 19a of the inner stator 12a and the outer coil 25a of the outer stator 20a are each composed of distributed winding air core coils. In FIG. 8, the meanings of U, V, and W labeled with + and − are the same as in FIG. 2. Even in the case of another configuration having the distributed winding coil in this way, as in the configuration of FIGS. 1 and 2, it is possible to prevent an excessive increase in the cost required for control, and the upper limit speed at high speed rotation can be prevented. Can be raised. Other configurations and operations are the same as those of FIGS. 1 and 2.

Although each embodiment of the present invention has been described above, the present invention is not limited to each of the above embodiments, and various modifications are possible.

For example, the configuration for changing the phase difference between the inner stators 12 and 12a and the outer stators 20 and 20a is not limited to the configuration shown in FIG. For example, the outer stator may be movable in the circumferential direction, and the inner stator may be fixed to the case so that the inner stator cannot be moved in the circumferential direction. In this case, the outer stator corresponds to one stator and the inner stator corresponds to the other stator. Further, in the above description, the case where the rotary electric machines 10 and 10a include both the inner rotor 30 and the outer rotor 40 has been described. However, the rotary electric machine has a configuration in which only one rotor is provided as one side rotor for the inner rotor and the outer rotor. May be. Further, in the configuration of FIG. 1, the protruding directions of the protrusions 15 and 23 may be reversed in the radial direction of the inner stator 12 and the outer stator 20, respectively.

Further, in each of the above examples, the case where the coils of the inner stator and the outer stator are air-core coils has been described, but the present invention is not limited to this, and for example, the coils of the inner stator and the outer stator are each made of a magnetic material inside. It may be configured to have a core. For example, in the configuration of FIG. 2, the main body portion 14 including the protrusion 15 between the in-phase coils of one of the inner stator 12 and the outer stator 20, for example, the inner stator 12 moving in the circumferential direction, is made of a steel plate or the like. It may be formed by a core made of a magnetic material. According to this configuration, the inductance of the coil of one stator can be increased. Further, in each of the above examples, the case where the resin main body portion is arranged between the inner coil of the inner stators 12 and 12a and the outer coil of the outer stators 20 and 20a has been described. On the other hand, by forming an appropriate gap between the inner stator and the outer stator in the radial direction, the resin portion arranged between them may be omitted.

10,10a rotary electric machine, 12,12a inner stator, 13 inner coil support part, 14 main body part, 15 protrusion part, 16 motor connection part, 17 disk part, 17a recess, 18 shaft part, 19, 19a inner coil, 20 , 20a outer stator, 21 outer coil support, 22 main body, 23 protrusions, 25, 25a outer coil, 30 inner rotor, 31 rotor core, 32 first magnet, 40 outer rotor, 41 rotor core, 42 second magnet, 50 Stator rotary motor, 50a motor case, 51 motor shaft, 60 rotor support member, 61 1st shaft part, 62 disc part, 63 cylinder part, 64 2nd shaft part, 64a small diameter shaft part.

Claims (3)

With an inner stator including a three-phase inner coil,
An outer stator arranged adjacent to each other on the outer side in the radial direction of the inner stator and including a three-phase outer coil,
The inner stator or the outer stator is provided with a one-sided rotor arranged apart from each other in the radial direction.
The one-sided rotor includes first magnets arranged at a plurality of positions in the circumferential direction.
One of the inner stator and the outer stator is movable in the circumferential direction, and the other stator is immovable in the circumferential direction.
By shifting the one stator in the circumferential direction with respect to the other stator, the amount of magnetic flux interlinking with the inner coil and the outer coil having the same phase can be controlled .
It comprises a rotor on the other side that is located apart from the outer stator or the other side in the radial direction of the inner stator and rotates in synchronization with the one side rotor.
The other rotor includes second magnets arranged at a plurality of positions in the circumferential direction.
The outer stator has a cylindrical outer body portion made of resin and an outer protrusion formed on the outer body portion and around which the outer coil is wound, and the inner stator is a cylindrical inner portion made of resin. It has a main body portion and an inner protrusion portion formed on the inner main body portion and around which the inner coil is wound, the inner main body portion is arranged inside the outer main body portion without a gap, and the inner stator is said. A rotary electric machine that is slidable with respect to an outer stator, one of which is fixed to a motor connecting portion fixed to a motor shaft by a cantilever support, and the other stator is fixed to a case . In the rotary electric machine according to claim 1,
The inner coil and the outer coil are rotary electric machines, each of which is composed of a centrally wound air core coil. In the rotary electric machine according to claim 1,
The inner coil and the outer coil are rotary electric machines, each of which is composed of a distributed winding air-core coil.

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