JP2013236455A - Stator and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator in which a plurality of three-phase winding sets are independently driven by drive circuits, respectively, and reliability of bus bars for the plurality of three-phase winding sets can be improved while downsizing of a physical constitution is secured, and a motor.SOLUTION: A stator is provided in which lead-out starting ends and lead-out terminal ends of windings U1-U4, V1-V4, and W1-W4 of first and second three-phase windings wound on a stator core 30 are led out in a shaft line direction at a short distance, and the lead-out starting ends and lead-out terminal ends are connected with corresponding first to twelfth bus bars B1-B12, respectively. This eliminates crossovers and complicated laying of wiring to make wiring compact, to thus realize a compact and highly reliable brushless motor.

Description

  The present invention relates to a stator and a motor.

  The brushless motor becomes inoperable when the winding that generates the rotating magnetic field wound around the stator is disconnected. Therefore, conventionally, in order to prevent this, the first system three-phase winding and the second system three-phase winding are wound around the stator of the motor. And even if one system three-phase winding is disconnected by generating a rotating magnetic field with each independent drive circuit for the first system three-phase winding and the second system three-phase winding, There has been proposed a brushless motor capable of maintaining the operation with the three-phase winding of the system (Patent Document 1).

JP 2011-030406 A

  By the way, in this type of brushless motor, the lead lines of the U-phase winding, the V-phase winding, and the W-phase winding are connected to each of the first-system three-phase winding and the second-system three-phase winding via a jumper. It has a routed wiring structure. For this reason, since these connecting wires are arranged in the vicinity of the rotor, the connecting wires may bite into the rotor and the rotor may be locked, and there is a problem in securing reliability.

  Therefore, it is conceivable that the connecting wire is drawn out to the control side (control area) like the lead-out line in Patent Document 1 and connected by, for example, a bus bar on the control side. However, the number of assembly steps increases, leading to an increase in cost. Problems arise. In order to avoid this cost increase, it is conceivable to connect the crossover with a bus bar on the motor side (operating region) side, but between the first system three-phase winding and the second system three-phase winding. It is required to ensure reliability such as short circuit prevention and to reduce the size of the motor.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce the size of a stator in which a plurality of three-phase winding sets are independently driven by respective drive circuits. It is an object of the present invention to provide a stator and a motor capable of improving the reliability of a bus bar having a plurality of three-phase winding sets while ensuring.

  According to the first aspect of the present invention, a plurality of three-phase winding sets are wound around the teeth of the stator core, and the three-phase winding sets are arranged for each three-phase winding set on one side in the axial direction of the plurality of three-phase winding sets. A plurality of bus bars connecting the windings belonging to the wire set and a stator having a bus bar holder for supporting the bus bars, wherein the plurality of bus bars provided for each of the three-phase winding sets are circular They are arcuate and are spaced apart from one another.

  According to the first aspect of the present invention, the windings are connected by the bus bar supported by the bus bar holder so that there is no crossover, and the bus bar has an arc shape conforming to the shape of the stator core and is separated from each other. Therefore, the reliability of the bus bar of a plurality of three-phase winding sets can be improved while ensuring the miniaturization of the physique of the stator.

According to a second aspect of the present invention, in the stator according to the first aspect, each of the arc-shaped bus bars has a concentric arc shape centering on a central axis of the stator.
According to invention of Claim 2, since a bus-bar is the circular arc shape according to the shape of a stator core, it arrange | positions compactly with respect to a stator core.

According to a third aspect of the present invention, in the stator according to the first or second aspect, the arc-shaped bus bars are spaced apart from each other in the radial direction.
According to the invention described in claim 3, since the bus bars are separated in the radial direction, the reliability of the bus bars can be ensured without short-circuiting each other.

  A fourth aspect of the present invention is the stator according to any one of the first to third aspects, wherein each of the arc-shaped bus bars is pulled out from one axial side of each of the windings. And the drawer end portion are connected on one side in the axial direction.

  According to the fourth aspect of the present invention, the leading end portion and the leading end portion of each winding are connected to the corresponding bus bar at a short distance, so that the wiring is made compact without handling complicated wiring.

  According to a fifth aspect of the present invention, in the stator according to any one of the first to fourth aspects, the bus bar holder that supports the bus bar is formed in an annular shape, and is disposed on the plurality of three-phase winding assembly sides. An accommodating portion for accommodating a coil end protruding from the stator core of each winding is formed.

  According to the fifth aspect of the present invention, since the coil end protruding from the stator core of each winding is accommodated, even if the winding is broken, it can be stopped by the accommodating portion.

  According to a sixth aspect of the present invention, in the stator of the fifth aspect, the annular bus bar holder is an arc-shaped bus bar holder formed so as to be divided by the number of the three-phase winding sets. Configured.

According to invention of Claim 6, a bus-bar holder turns into an arc-shaped bus-bar holder according to the number of 3-phase winding groups.
According to a seventh aspect of the present invention, in the stator according to any one of the first to sixth aspects, the winding of each phase provided for each of the plurality of three-phase winding sets is positive with respect to the teeth. It is formed by a winding pair consisting of concentrated winding of winding and concentrated winding of reverse winding with respect to the teeth.

According to the seventh aspect of the present invention, the winding pair of each phase generates a magnetic field in the opposite direction to the teeth when energized.
According to an eighth aspect of the present invention, in the stator according to the seventh aspect of the present invention, the winding pair composed of the concentrated winding of the normal winding and the concentrated winding of the reverse winding of each phase is formed on adjacent teeth.

According to the invention described in claim 8, a magnetic field in the opposite direction is generated between adjacent teeth by energization.
According to a ninth aspect of the present invention, in the stator of the seventh or eighth aspect, the winding pair composed of the concentrated winding of the normal winding and the concentrated winding of the reverse winding of each phase is formed on adjacent teeth. In addition, the same winding pair is arranged in parallel for each same three-phase winding set.

According to the ninth aspect of the present invention, for each three-phase winding group, the winding pairs of each phase belonging to the three-phase winding group are arranged in parallel in the circumferential direction.
According to a tenth aspect of the present invention, in the stator according to the seventh or eighth aspect, the winding pair including the concentrated winding of the normal winding and the concentrated winding of the reverse winding of each phase is formed in adjacent teeth. The winding pairs are arranged at intervals of 120 ° in the circumferential direction with respect to the winding pairs of the other phases of the same three-phase winding set.

  According to the tenth aspect of the present invention, the winding pairs of each phase belonging to the three-phase winding set are arranged at intervals of 120 ° in the circumferential direction for each three-phase winding set. Torque ripples can be reduced when the three-phase winding set becomes inoperative.

  According to an eleventh aspect of the present invention, in the stator according to the seventh aspect, the winding pair composed of the concentrated winding of the normal winding and the concentrated winding of the reverse winding of each phase is arranged in the circumferential direction with respect to one winding. They are arranged at intervals of 180 °.

  According to the eleventh aspect of the invention, for each three-phase winding group, the winding pairs of each phase belonging to the three-phase winding group are arranged at an interval of 180 ° in the circumferential direction with respect to one winding. Therefore, torque ripple can be reduced when one set of three-phase windings becomes inoperative.

The invention according to claim 12 is the stator according to any one of claims 1 to 11,
The plurality of three-phase winding sets are two sets.

According to the twelfth aspect of the present invention, a rotating magnetic field can be generated in the other three-phase winding set even if one of the three-phase winding sets becomes inoperative.
According to a thirteenth aspect of the present invention, in the stator according to any one of the first to twelfth aspects, each of the plurality of three-phase winding sets is a delta connection.

According to the thirteenth aspect of the present invention, even when one of the three-phase winding sets having a delta connection structure becomes inoperative, a rotating magnetic field can be generated by the other three-phase winding set having a delta connection structure. .
The invention according to claim 14 is the stator according to any one of claims 1 to 12,
Each of the plurality of three-phase winding sets is a star connection.

According to the fourteenth aspect of the present invention, a rotating magnetic field can be generated by the three-phase winding set of one star connection structure even if the three-phase winding set of one star connection structure becomes inoperative. .
According to a fifteenth aspect of the present invention, in the stator according to any one of the first to twelfth aspects, the plurality of three-phase winding sets are a delta connection and a star connection.

According to the fifteenth aspect of the present invention, a rotating magnetic field can be generated in the three-phase winding set of the other connection structure even if the three-phase winding set of one connection structure becomes inoperative.
A sixteenth aspect of the present invention is a motor including the stator according to any one of the first to fifteenth aspects.

According to the sixteenth aspect of the present invention, it is possible to improve the reliability while ensuring the downsizing of the physique.
According to a seventeenth aspect of the present invention, in the motor according to the sixteenth aspect, each of the plurality of three-phase winding sets is driven by an individual drive circuit.

According to the seventeenth aspect of the present invention, even when one of the three-phase winding sets becomes inoperative, the motor can be driven by the other three-phase winding set.
According to an eighteenth aspect of the present invention, in the motor according to the sixteenth or seventeenth aspect, the stator includes twelve concentrated windings on twelve teeth, and the rotor disposed inside the stator has ten rotors. Either poles or 14 poles.

  According to the invention of claim 18, it is possible to improve the reliability while ensuring the miniaturization of the physique, and even if one of the three-phase winding sets becomes inoperative, the other three-phase winding set It can be driven by.

The invention according to claim 19 is the motor according to any one of claims 16 to 18,
The motor is a motor used in an electric power steering apparatus.

  According to the nineteenth aspect of the present invention, the motor is driven by the other three-phase winding set even if one of the three-phase winding sets becomes inoperative even if one of the three-phase winding sets becomes inoperative. The assist torque can be continuously applied to the steering wheel.

  According to the present invention, in a stator in which a plurality of three-phase winding sets are independently driven by respective drive circuits, the reliability of the bus bar of the plurality of three-phase winding sets is ensured while ensuring a reduction in size. Can be improved.

Explanatory drawing explaining the electric power steering system of 1st Embodiment. Sectional drawing of the axial direction of a brushless motor similarly. Sectional drawing of the brushless motor similarly seen from the rear side. The perspective view similarly seen from the front side of the 1st and 2nd bus-bar holder. Explanatory drawing similarly seen from the rear side explaining the wiring state of each drawer | drawing start end part and drawer | drawing termination | terminus part of each 1st and 2nd system | strain 3 phase winding, and each bus bar. Similarly the figure which looked at the 1st busbar holder from the rear side. Similarly the figure which looked at the 2nd busbar holder from the rear side. The equivalent circuit explaining the connection structure of a 1st system | strain 3 phase winding similarly. The equivalent circuit explaining the connection structure of 2nd system | strain 3 phase winding similarly. The electric circuit diagram of a brushless motor. Sectional drawing seen from the rear side of the brushless motor of 2nd Embodiment. Explanatory drawing similarly seen from the rear side explaining the wiring state of each drawer | drawing start end part and drawer | drawing termination | terminus part of each 1st and 2nd system | strain 3 phase winding, and each bus bar. Similarly the figure which looked at the 1st busbar holder from the rear side. Similarly the figure which looked at the 2nd busbar holder from the rear side. The equivalent circuit explaining the connection structure of a 1st system | strain 3 phase winding similarly. The equivalent circuit explaining the connection structure of 2nd system | strain 3 phase winding similarly. The electric circuit diagram of a brushless motor. Sectional drawing seen from the rear side of the brushless motor of 3rd Embodiment. The perspective view seen similarly from the front side of the annular bus bar holder. Similarly the figure which looked at the annular busbar holder from the rear side. Explanatory drawing similarly seen from the rear side explaining the wiring state of each drawer | drawing start end part and drawer | drawing termination | terminus part of each 1st and 2nd system | strain 3 phase winding, and each bus bar. The equivalent circuit explaining the connection structure of a 1st system | strain 3 phase winding similarly. The equivalent circuit explaining the connection structure of 2nd system | strain 3 phase winding similarly. The electric circuit diagram of a brushless motor. Sectional drawing seen from the rear side of the brushless motor of 4th Embodiment. Similarly the figure which looked at the annular busbar holder from the rear side. Explanatory drawing similarly seen from the rear side explaining the wiring state of each drawer | drawing start end part and drawer | drawing termination | terminus part of each 1st and 2nd system | strain 3 phase winding, and each bus bar. The equivalent circuit explaining the connection structure of a 1st system | strain 3 phase winding similarly. The equivalent circuit explaining the connection structure of 2nd system | strain 3 phase winding similarly. The electric circuit diagram of a brushless motor.

(First embodiment)
Hereinafter, a first embodiment in which a stator of the present invention is embodied in a motor for an electric power steering apparatus will be described with reference to FIGS.

  As shown in FIG. 1, the electric power steering apparatus 1 is a column assist type, and has a steering shaft 3 with a steering wheel 2 fixed to a base end portion, and a distal end portion of the steering shaft 3 has a universal joint 4. Via the intermediate 5. The steering shaft 3 includes an input shaft 3a and an output shaft 3b, and a part of the output shaft 3b is inserted into the cylindrical input shaft 3a. The steering wheel 2 is fixed to the proximal end portion of the input shaft 3a, and the universal joint 4 is connected to the distal end portion of the output shaft 3b. Further, a torsion bar (not shown) is provided between the input shaft 3a and the output shaft 3b, and rotates the output shaft 3b following the rotation of the input shaft 3a.

  Then, the rotation and the steering torque based on the steering operation are transmitted to the rack 7 & pinion shaft 8, and the rack 7 reciprocates in the vehicle width direction by the rotation of the pinion shaft 8. As a result, the steering angle of the steered wheels 10 is changed via the tie rods 9 connected to both ends of the rack 7.

  A steering column 11 is provided on the input shaft 3 a of the steering shaft 3. The steering column 11 is provided with a three-phase brushless motor (hereinafter referred to as a brushless motor) M as a motor for an electric power steering system. The brushless motor M applies an auxiliary steering force (hereinafter referred to as assist torque) to the steering wheel 2 when the steering operation is performed by controlling the rotation of the input shaft 3a.

  More specifically, when the input shaft 3a rotates based on the operation of the steering wheel 2, a shift occurs with the output shaft 3b, and this shift appears as a twist of the torsion bar. That is, the output shaft 3b is delayed with respect to the rotation of the input shaft 3a due to the road surface resistance of the steered wheels 10, and the torsion bar is twisted.

  The torsion angle of the torsion bar is detected by a torque sensor (not shown), the steering torque applied to the input shaft 3a (steering wheel 2) is detected, and the steering operation is performed based on the detected steering torque. Torque is calculated, and the brushless motor M is driven and controlled.

  As shown in FIG. 2, the motor case 20 of the brushless motor M includes a motor housing 21 formed in a bottomed cylindrical shape, and a front cover 22 that closes an opening on the front side of the motor housing 21. . An accommodation box 23 is attached to the rear cover wall 21 a on the rear side of the motor housing 21.

  A stator 24 is fixed to the inner peripheral surface of the motor housing 21, and a rotor 26 that is fixed to the rotary shaft 25 and rotates together with the rotary shaft 25 is disposed inside the stator 24. The rotating shaft 25 is rotatably supported by bearings 27 and 28 provided on the rear cover wall 21a and the front cover 22 of the motor housing 21, and a tip portion protruding from the front cover 22 is a speed reduction made of a gear or the like (not shown). The drive shaft is connected to the input shaft 3a of the steering shaft 3 through the device.

  As shown in FIG. 3, the stator 24 has a cylindrical stator core 30, and the outer peripheral surface of the stator core 30 is fixed to the motor housing 21. Inside the stator core 30, a plurality of teeth 31 are formed along the axial direction and arranged at an equal pitch in the circumferential direction, and are formed to extend inward in the radial direction. The teeth 31 are T-shaped so that both side surfaces in the circumferential direction of the tip end protrude in the circumferential direction, and the tip surface on the radially inner side is an arc surface centered on the central axis L <b> 1 of the rotation shaft 25. Teeth.

  A slot 32 is formed between the teeth 31. In the present embodiment, the number of teeth 31 is twelve, and the number of slots 32 is twelve, which is the same as the number of teeth 31.

  The twelve teeth 31 are formed with two U-phase, V-phase, and V-phase three-phase windings, that is, a first system three-phase winding S1 and a second system three-phase winding S2. ing. The first system three-phase winding S1 and the second system three-phase winding S2 are concentrated windings and are formed at 180 ° symmetrical positions (axisymmetric about the central axis L1 of the rotating shaft 24). That is, in FIG. 3, the first system three-phase winding S1 is wound around the six teeth 31 in the upper half, and the second system three-phase winding S2 is wound around the six teeth 31 in the lower half. Yes.

  More specifically, the first system three-phase winding S1 has a first U-phase winding U1 → second U-phase winding U2 → first V-phase winding V1 → second V-phase winding V2 → second in the clockwise direction in FIG. It is wound by concentrated winding on the corresponding teeth 31 in the order of 1 W-phase winding W1 → second W-phase winding W2.

  Further, the second system three-phase winding S2 is the third U-phase winding U3 → the fourth U-phase winding U4 → the third V-phase winding V3 → the fourth V-phase winding V4 → the third W-phase in the clockwise direction in FIG. It is wound by concentrated winding on the corresponding teeth 31 in the order of the winding W3 → the fourth W-phase winding W4.

In the first system three-phase winding S1, in-phase windings wound around adjacent teeth 31 are wound in opposite directions.
More specifically, the first U-phase winding U1 is wound by reverse winding, and the second U-phase winding U2 is wound by forward winding. Then, the drawing start end portions U1a and U2a and the drawing end portions U1b and U2b of the first and second U-phase windings U1 and U2 are drawn out to the rear side, respectively.

  Further, the first V-phase winding V1 is wound with a normal winding, and the second V-phase winding V2 is wound with a reverse winding. Then, the drawing start end portions V1a and V2a and the drawing end portions V1b and V2b of the first and second V-phase windings V1 and V2 are drawn out to the rear side, respectively.

  Further, the first W-phase winding W1 is wound in the reverse direction, and the second W-phase winding W2 is wound in the forward direction. Then, the drawing start end portions W1a and W2a and the drawing end portions W1b and W2b of the first and second W-phase windings W1 and W2 are drawn out to the rear side, respectively.

  Therefore, the reverse-turned first U-phase winding U1 and the forward-turned second U-phase winding U2, the forward-turned first V-phase winding V1, the reverse-turned second V-phase winding V2, and the reverse-winding first W-phase winding W1 Each of the wound second W-phase windings W2 generates a magnetic field in the opposite direction when energized.

Similarly, in the second system three-phase winding S2, in-phase windings wound around adjacent teeth 31 are wound in opposite directions.
More specifically, the third U-phase winding U3 is wound with a normal winding, and the fourth U-phase winding U4 is wound with a reverse winding. The leading end portions U3a, U4a and the leading end portions U3b, U4b of the third and fourth U-phase windings U3, U4 are each pulled out to the rear side.

  The third V-phase winding V3 is wound in the reverse direction, and the fourth V-phase winding V4 is wound in the forward direction. Then, the drawing start end portions V3a, V4a and the drawing end portions V3b, V4b of the third and fourth V-phase windings V3, V4 are drawn out to the rear side, respectively.

  Further, the third W-phase winding W3 is wound in the forward winding, and the fourth W-phase winding W4 is wound in the reverse winding. Then, the drawing start end portions W3a and W4a and the drawing end portions W3b and W4b of the third and fourth W-phase windings W3 and W4 are drawn out to the rear side, respectively.

  Therefore, the forward third U-phase winding U3 and the reverse fourth U-phase winding U4, the reverse third winding V-phase winding V3, the forward fourth winding V-phase winding V4, the forward third winding W-phase winding W3, The reversely wound fourth W-phase winding W4 generates a magnetic field in the opposite direction when energized.

  A synchronized three-phase power supply voltage is applied to the first system three-phase winding S1 and the second system three-phase winding S2. That is, a synchronized U-phase power supply voltage is applied to the first and second U-phase windings U1 and U2 and the third and fourth U-phase windings U3 and U4, and the first and second V-phase windings V1 and V2 and the third The fourth V-phase windings V3 and V4 are applied with a synchronized V-phase power supply voltage, and the first and second W-phase windings W1 and W2 and the third and fourth W-phase windings W3 and W4 are synchronized with each other. Is applied.

As shown in FIGS. 4 to 7, on the rear side of the stator core 30 around which the first system three-phase winding S1 and the second system three-phase winding S2 are wound, the first bus bar holder supported by the motor housing 21 is provided. 35 and a second bus bar holder 36 are arranged.
(First bus bar holder 35)
The first bus bar holder 35 has a semicircular arc plate-like first base part 35a which is an insulating member and is arranged opposite to the first system three-phase winding S1, and the radial direction of the base part 35a The outer peripheral surface and the inner peripheral surface are formed so as to be concentric with the central axis L1 of the rotation shaft 25 as the center.

  An outer peripheral wall 35b is formed at the outer peripheral end of the first base portion 35a on the stator core 30 side, and the inner peripheral wall 35c is formed at the inner peripheral end on the stator core 30 side. It is extended and formed.

  Then, the first base portion 35a, the outer peripheral wall portion 35b, and the inner peripheral wall portion 35c form a semicircular arc-shaped storage space 35d opened on the stator core 30 side, and the storage space 35d is shown in FIG. As described above, a protruding portion (coil end) is accommodated on the rear side from the stator core 30 of the first system three-phase winding S1 wound around the stator core 30.

  As a result, the accommodation space 35d has a first U-phase winding U1, a second U-phase winding U2, a first V-phase winding V1, a second V-phase winding V2, a first W-phase winding W1, and a second W-phase winding W2. A protruding portion (coil end) is accommodated on the rear side.

  As shown in FIG. 6, in the first base portion 35a, the positions where the windings U1, U2, V1, V2, W1, W2 are accommodated and in predetermined radial positions are respectively penetrated through the drawing start end. Holes H1a, H2a, H3a, H4a, H5a, and H6a and lead-out terminal through holes H1b, H2b, H3b, H4b, H5b, and H6b are formed through the holes.

  At this time, in the clockwise direction in FIG. 6, the drawing end through hole H1b → the drawing start end through hole H1a → the drawing start end through hole H2a → the drawing end through hole H2b → the drawing start end through hole H3a → the drawing end through hole H3b → the drawing end through hole. A hole H4b, a drawing start end through hole H4a, a drawing end through hole H5b, a drawing start end through hole H5a, a drawing end through hole H6b, and a drawing start end through hole H6a are formed in this order.

  Here, as shown in FIG. 6, an arc trajectory passing through an intermediate position between the outer peripheral wall portion 35b and the inner peripheral wall portion 35c with the central axis L1 of the rotation shaft 25 as the center is defined as an intermediate line Lc, and the intermediate line Lc A trajectory of an arc passing through the intermediate position of the outer peripheral wall portion 35b is defined as an outer peripheral line Lo, and a trajectory of an arc passing through the intermediate position of the intermediate line Lc and the inner peripheral wall portion 35c is defined as an inner peripheral line Li.

  The leading end through hole H1b is formed at a position corresponding to the first U-phase winding U1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U1b of the 1st U-phase coil | winding U1 is protruded to the rear side of the 1st base part 35a via the drawer | drawer termination | terminus through-hole H1b.

  Next, the drawing start end through hole H1a is formed at a position corresponding to the first U-phase winding U1 and penetrating the outer peripheral line Lo perpendicular to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part U1a of the 1st U-phase coil | winding U1 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H1a.

  Next, the lead-out start end through hole H2a is formed at a position corresponding to the second U-phase winding U2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part U2a of the 2nd U-phase coil | winding U2 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H2a.

  Next, the lead-out terminal through hole H2b is formed at a position corresponding to the second U-phase winding U2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U2b of the 2nd U-phase coil | winding U2 is made to protrude in the rear side of the 1st base part 35a via the drawer | drawer termination | terminus through-hole H2b.

  Next, the lead-out start end through hole H3a is formed at a position corresponding to the first V-phase winding V1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V1a of the 1st V-phase coil | winding V1 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H3a.

  Next, the leading end through hole H3b is formed at a position corresponding to the first V-phase winding V1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V1b of the 1st V-phase coil | winding V1 is protruded to the rear side of the 1st base part 35a via the drawer | drawer termination through-hole H3b.

  Next, the lead-out terminal through hole H4b is formed at a position corresponding to the second V-phase winding V2 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V2b of the 2nd V-phase coil | winding V2 is protruded to the rear side of the 1st base part 35a via the drawer | drawer termination through-hole H4b.

  Next, the drawing start end through hole H4a is formed at a position corresponding to the second V-phase winding V2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V2a of the 2nd V-phase coil | winding V2 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H4a.

  Next, the lead-out terminal through hole H5b is formed at a position corresponding to the first W-phase winding W1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W1b of the 1st W-phase coil | winding W1 is protruded to the rear side of the 1st base part 35a via the drawer | drawer termination | terminus through-hole H5b.

  Next, the lead-out start end through hole H5a is formed so as to penetrate the inner circumferential line Li at a position corresponding to the first W-phase winding W1 and perpendicular to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W1a of the 1st W-phase coil | winding W1 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H5a.

  Next, the lead-out terminal through hole H6b is formed at a position corresponding to the second W-phase winding W2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W2b of the 2nd W-phase coil | winding W2 is protruded to the rear side of the 1st base part 35a through the drawer | drawer termination | terminus through-hole H6b.

  Next, the extraction start end through hole H6a is formed at a position corresponding to the second W-phase winding W2 so as to penetrate the outer peripheral line Lo perpendicularly to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W2a of the 2nd W-phase coil | winding W2 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H6a.

As shown in FIG. 5, a plurality of arc-shaped bus bars B <b> 1 to B <b> 6 are disposed along the outer peripheral line Lo, the intermediate line Lc, and the inner peripheral line Li on the rear side surface of the first base portion 35 a. .
More specifically, the first to sixth bus bars B1 to B6 are round conductive wires (for example, enameled wires) coated with insulation, and the first to fourth bus bars B1 to B4 are arranged in four on the intermediate line Lc. B5, one fifth bus bar B5 is arranged on the outer peripheral line Lo, and one sixth bus bar B6 is arranged on the inner peripheral line Li.

  The first bus bar B1 electrically connects the leading end portion U1b of the first U-phase winding U1 protruding from the leading end through hole H1b and the leading end portion U2a of the second U phase winding U2 protruding from the leading start end through hole H2a. It is a bus bar to be connected. At this time, the first bus bar B1 is disposed along the intermediate line Lc between the drawer end portion U1b and the drawer start end portion U2a, and is electrically connected by welding the connecting portion between the drawer end portion U1b and the drawer start end portion U2a. Connecting.

  The second bus bar B2 electrically connects the lead end portion U2b of the second U-phase winding U2 protruding from the lead end through hole H2b and the lead start end V1a of the first V phase winding V1 protruding from the lead start end through hole H3a. It is a bus bar to be connected. At this time, the second bus bar B2 is disposed along the intermediate line Lc between the drawing end portion U2b and the drawing start end portion V1a, and is electrically connected by welding the connecting portion between the drawing end portion U2b and the drawing start end portion V1a. Connecting.

  In the second bus bar B2, the leading end portion of the leading end portion U2b of the second U-phase winding U2 is cut at the connection portion with the second bus bar B2, whereas the leading end portion of the first V-phase winding V1 is cut off. V1a is further pulled out from the connecting portion with the second bus bar B2 to the rear side in the rear axial direction. The leading end portion V1a of the first V-phase winding V1 with the tip portion pulled out to the rear side in the axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, so that the first V phase A power supply voltage Vv1 is applied.

  The third bus bar B3 electrically connects the leading end portion V1b of the first V-phase winding V1 protruding from the leading end through hole H3b and the leading end portion V2a of the second V phase winding V2 protruding from the leading start end through hole H4a. It is a bus bar to be connected. At this time, the third bus bar B3 is disposed along the intermediate line Lc between the drawer termination portion V1b and the drawer start end portion V2a, and is electrically connected by welding the connection portion between the drawer termination portion V1b and the drawer start end portion V2a. Connecting.

  The fourth bus bar B4 electrically connects the leading end portion W1b of the first W-phase winding W1 protruding from the leading end through hole H5b and the leading end portion W2b of the second W phase winding W2 protruding from the leading end through hole H6b. It is a bus bar to be connected. At this time, the fourth bus bar B4 is disposed along the intermediate line Lc between the drawer termination portion W1b and the drawer termination portion W2b, and electrically connects the connection portion of the drawer termination portion W1b and the drawer termination portion W2b. Connecting.

  The fifth bus bar B5 electrically connects the leading start end U1a of the first U-phase winding U1 protruding from the leading start end through hole H1a and the leading start end W2a of the second W phase winding W2 protruding from the leading start end through hole H6a. It is a bus bar to be connected. At this time, the fifth bus bar B5 is disposed along the outer peripheral line Lo between the drawing start end U1a and the drawing start end W2a, and is electrically connected by welding the connection portion between the drawing start end U1a and the drawing start end W2a. Connecting.

  In the fifth bus bar B5, the leading end portion W2a of the second W-phase winding W2 is cut at the connecting portion with the fifth bus bar B5, whereas the leading start end portion of the first U-phase winding U1. U1a is further drawn from the connecting portion with the fifth bus bar B5 to the rear side in the rear axial direction. The leading end portion U1a of the first U-phase winding U1 with the leading end pulled out to the rear side in the axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, so that the first U phase A power supply voltage Vu1 is applied.

  The sixth bus bar B6 is electrically connected to the leading end portion V2b of the second V winding V2 protruding from the leading end through hole H4b and the leading start end portion W1a of the first W-phase winding W1 protruding from the leading start end through hole H5a. It is a bus bar. At this time, the sixth bus bar B6 is disposed along the inner peripheral line Li between the pull-out terminal end portion V2b and the pull-out start end portion W1a, and welds the connection portion of the pull-out terminal end portion V2b and the pull-out start end portion W1a. Connect them electrically.

  Note that, in the sixth bus bar B6, the leading end portion of the leading end portion V2b of the second V-phase winding V2 is cut at the connection portion with the sixth bus bar B6, whereas the leading end portion of the first W-phase winding W1 is cut off. The leading end of W1a is further drawn out from the connecting portion with the sixth bus bar B6 toward the rear side in the rear axial direction. The leading end portion W1a of the first W-phase winding W1 with the leading end pulled out to the rear side in the rear axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, and the first W-phase A power supply voltage Vw1 is applied.

As a result, the first system three-phase winding S1 has a delta-connected winding structure as shown in FIG.
The second bus bar holder 36 has the same material and the same shape as the first bus bar holder 35, and has a semicircular arc plate-like second base portion 36a arranged opposite to the second system three-phase winding S2. doing. Similar to the first bus bar holder 35, an outer peripheral wall portion 36 b and an inner peripheral wall portion 36 c are formed on the side surface of the second base portion 36 on the stator core 30 side so as to extend toward the stator core 30 side.

  The second base portion 36a, the outer peripheral wall portion 36b, and the inner peripheral wall portion 36c form a semicircular arc-shaped storage space 36d opened on the stator core 30 side, and the storage space 36d is shown in FIG. As described above, a protruding portion (coil end) is accommodated on the rear side from the stator core 30 of the second system three-phase winding S2 wound around the stator core 30.

  As a result, in the accommodation space 36d, the third U-phase winding U3 → the fourth U-phase winding U4 → the third V-phase winding V3 → the fourth V-phase winding V4 → the third W-phase winding W3 → the fourth W-phase winding W4. A protruding portion (coil end) is accommodated on the rear side.

  As shown in FIG. 7, in the second base portion 36a, the positions where the windings U3, U4, V3, V4, W3, W4 are accommodated and in a predetermined radial position are respectively penetrated through the drawing start end. Holes H7a, H8a, H9a, H10a, H11a, and H12a and lead-out terminal through holes H7b, H8b, H9b, H10b, H11b, and H12b are formed through the holes.

  At this time, in the clockwise direction in FIG. 7, the drawing start end through hole H7a → the drawing end through hole H7b → the drawing end through hole H8b → the drawing start end through hole H8a → the drawing end through hole H9b → the drawing start end through hole H9a → the drawing start end through. A hole H10a, a drawing end through hole H10b, a drawing start end through hole H11a, a drawing end through hole H11b, a drawing start end through hole H12a, and a drawing end through hole H12b are formed in this order.

Here, similarly to the first base portion 35a, the intermediate line Lc, the outer peripheral line Lo, and the inner peripheral line Li are set also in the second base portion 36a.
The lead-out starting end through hole H7a is formed at a position corresponding to the third U-phase winding U3 so as to be perpendicular to the outer peripheral line Lo in the axial direction. And the front-end | tip part of the drawer | drawing-out start-end part U3a of the 3rd U-phase coil | winding U3 is protruded to the rear side of the 2nd base part 36a via the drawer | draw-out start end through-hole H7a.

  Next, the lead-out terminal through hole H7b is formed at a position corresponding to the third U-phase winding U3 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U3b of the 3rd U-phase coil | winding U3 is protruded to the rear side of the 2nd base part 36a via the drawer | drawer termination | terminus through-hole H7b.

  Next, the lead-out terminal through hole H8b is formed at a position corresponding to the fourth U-phase winding U4 so as to penetrate the inner circumferential line Li perpendicular to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U4b of the 4th U-phase coil | winding U4 is made to project to the rear side of the 2nd base part 36a via the drawer | drawer termination | terminus through-hole H8b.

  Next, the drawing start end through hole H8a is formed at a position corresponding to the fourth U-phase winding U4 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start-end part U4a of the 4th U-phase coil | winding U4 is protruded to the rear side of the 2nd base part 36a via the drawer | draw-out start end through-hole H8a.

  Next, the lead-out terminal through hole H9b is formed at a position corresponding to the third V-phase winding V3 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V3b of the 3rd V-phase coil | winding V3 is protruded to the rear side of the 2nd base part 36a via the drawer | drawer termination through-hole H9b.

  Next, the drawing start end through hole H9a is formed at a position corresponding to the third V-phase winding V3 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the extraction | drawer start end part V3a of the 3rd V-phase coil | winding V3 is made to protrude in the rear side of the 2nd base part 36a via the extraction | drawer start end through-hole H9a.

  Next, the lead-out start end through hole H10a is formed at a position corresponding to the fourth V-phase winding V4 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V4a of the 4th V-phase coil | winding V4 is protruded to the rear side of the 2nd base part 36a via the drawer | drawing-out start end through-hole H10a.

  Next, the lead-out terminal through hole H10b is formed at a position corresponding to the fourth V-phase winding V4 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V4b of the 4th V-phase coil | winding V4 is protruded to the rear side of the 2nd base part 36a via the drawer | drawer termination through-hole H10b.

  Next, the lead-out start end through hole H11a is formed so as to penetrate the intermediate line Lc at a position corresponding to the third W-phase winding W3 and perpendicular to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W3a of the 3rd W-phase coil | winding W3 is protruded to the rear side of the 2nd base part 36a through the drawer | drawing-out start end through-hole H11a.

  Next, the lead-out terminal through hole H11b is formed at a position corresponding to the third W-phase winding W3 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W3b of the 3rd W-phase coil | winding W3 is protruded to the rear side of the 2nd base part 36a via the drawer | drawer termination | terminus through-hole H11b.

  Next, the lead-out terminal through hole H12b is formed at a position corresponding to the fourth W-phase winding W4 and through the outer peripheral line Lo so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W4b of the 4th W-phase coil | winding W4 is protruded to the rear side of the 2nd base part 36a via the drawer | drawer termination through-hole H12b.

  Next, the lead-out start end through hole H12a is formed at a position corresponding to the fourth W-phase winding W4 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W4a of the 4th W-phase coil | winding W4 is protruded to the rear side of the 2nd base part 36a via the drawer | drawing-out start end through-hole H12a.

As shown in FIG. 5, a plurality of arc-shaped bus bars B7 to B12 are arranged along the outer peripheral line Lo, the intermediate line Lc, and the inner peripheral line Li on the rear side surface of the second base portion 36a. .
More specifically, the seventh to twelfth bus bars B7 to B12 are round conductors (for example, enamel wires) coated with insulation, and the seventh to tenth bus bars B7 to B are arranged in four on the intermediate line Lc. One eleventh bus bar B11 is arranged on B10, the outer peripheral line Lo, and one twelfth bus bar B12 is arranged on the inner peripheral line Li.

  The seventh bus bar B7 electrically connects the leading end portion U3b of the third U-phase winding U3 protruding from the leading end through hole H7b and the leading end portion U4a of the fourth U phase winding U4 protruding from the leading start end through hole H8a. It is a bus bar to be connected. At this time, the seventh bus bar B7 is disposed along the intermediate line Lc between the drawer termination portion U3b and the drawer start end U4a, and is electrically connected by welding the connection portion between the drawer termination portion U3b and the drawer start end U4a. Connecting.

  The eighth bus bar B8 electrically connects the leading end portion V3b of the third V-phase winding V3 protruding from the leading end through hole H9b and the leading start end portion V4a of the fourth V phase winding V4 protruding from the leading start end through hole H10a. It is a bus bar to be connected. At this time, the eighth bus bar B8 is disposed along the intermediate line Lc between the drawer termination portion V3b and the drawer start end portion V4a, and is electrically connected by welding the connection portion between the drawer termination portion V3b and the drawer start end portion V4a. Connecting.

  The ninth bus bar B9 electrically connects the leading end portion V4b of the fourth V-phase winding V4 protruding from the leading end through hole H10b and the leading start end portion W3a of the third W phase winding W3 protruding from the leading start end through hole H11a. It is a bus bar to be connected. At this time, the ninth bus bar B9 is disposed along the intermediate line Lc between the pull-out terminal end portion V4b and the pull-out start end portion W3a, and is electrically connected by welding the connecting portion between the pull-out terminal end portion V4b and the pull-out start end portion W3a. Connecting.

  In the ninth bus bar B9, the leading end portion V4b of the fourth V-phase winding V4 is cut at the connection portion with the ninth bar B9, whereas the leading end portion of the third W-phase winding W3 is pulled out. The tip of W3a is further drawn out from the connecting portion with the ninth bus bar B9 to the rear side in the rear axial direction. The leading end portion W3a of the third W-phase winding W3 with the tip portion pulled out to the rear side in the rear axial direction passes through the through-hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, so that the second W-phase A power supply voltage Vw2 is applied.

  The tenth bus bar B10 electrically connects the lead start end W3a of the third W phase winding W3 protruding from the lead start end through hole H10a and the lead end portion W4b of the fourth W phase winding W4 protruding from the lead end through hole H12b. It is a bus bar to be connected. At this time, the tenth bus bar B10 is disposed along the intermediate line Lc between the drawing start end portion W3a and the drawing end portion W4b, and is electrically connected by welding the connecting portion between the drawing start end portion W3a and the drawing end portion W4b. Connecting.

  The eleventh bus bar B11 electrically connects the lead start end portion U3a of the third U-phase winding U3 protruding from the lead start end through hole H7a and the lead end portion W4b of the fourth W phase winding W4 protruding from the lead end through hole H12a. It is a bus bar to be connected. At this time, the eleventh bus bar B11 is disposed along the outer peripheral line Lo between the drawing start end U3a and the drawing end W4b, and is electrically connected by welding the connection portion between the drawing start end U3a and the drawing end W4b. Connecting.

  In the eleventh bus bar B11, the leading end portion of the leading end portion W4b of the fourth W-phase winding W4 is cut at the connecting portion with the eleventh bus bar B11, whereas the leading end portion of the third U-phase winding U3 is pulled out. U3a is further extended from the connecting portion with the eleventh bus bar B11 to the rear side in the rear axial direction. The leading end portion U3a of the third U-phase winding U3 with the tip portion pulled out to the rear side in the rear axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, and the second U-phase A power supply voltage Vu2 is applied.

  The twelfth bus bar B12 electrically connects the leading end portion U4b of the fourth U winding U4 protruding from the leading end through hole H8b and the leading start end portion V3a of the third V-phase winding V3 protruding from the leading start end through hole H9a. It is a bus bar. At this time, the twelfth bus bar B12 is disposed along the inner peripheral line Li between the pull-out terminal end U4b and the pull-out start end V3a, and is electrically connected by welding the connecting portion between the pull-out end U4b and the pull-out start end V3a. Connect to.

  Note that in the twelfth bus bar B12, the leading end portion of the fourth U-phase winding U4 is cut at the connection portion with the twelfth bus bar B12, whereas the leading end portion of the third V-phase winding V3 is cut off. The tip of V3a is further drawn from the connecting portion with the twelfth bus bar B12 to the rear side in the rear axial direction. The leading end portion V3a of the third V-phase winding V3 with the tip portion pulled out to the rear axial direction rear side passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, so that the second V-phase A power supply voltage Vv2 is applied.

As a result, the second system three-phase winding S2 has a delta-connected winding structure as shown in FIG.
As shown in FIG. 3, a rotor 26 fixed to the rotating shaft 25 is disposed inside the stator 24. The rotor 26 has a cylindrical rotor core 40, and the rotor core 40 is fixed to the rotating shaft 25.

  On the outer circumferential surface of the rotor core 40, five first permanent magnets 41 having N poles on the radially outer side and S poles on the radially inner side at equal intervals in the circumferential direction, and S poles on the radially outer side and radially inner sides on the radially inner side. Five second permanent magnets 42 composed of N poles are pasted and fixed along the axial direction. The five first permanent magnets 41 and the five second permanent magnets 42 are alternately arranged in the circumferential direction. Therefore, the rotor 26 of the present embodiment is an SPM (Surface Permanent Magnet) type and is a 10-pole rotor.

As shown in FIG. 2, the rear end portion of the rotary shaft 25 penetrates the rear cover wall 21 a and is disposed in the storage box 23.
A circuit board 50 is supported and fixed in the accommodation box 23. A first drive circuit 51 that controls energization of the first three-phase winding S1 at a position on the rear side of the circuit board 50 and opposed to the first three-phase winding S1 wound around the stator 24. Has been implemented. Further, the second system three-phase winding S2 is controlled to be energized at a position below the rear side of the circuit board 50 and facing the second system three-phase winding S2 wound around the stator 24. A drive circuit 52 is mounted.

  Further, on the rear side of the circuit board 50 and between the first drive circuit 51 and the second drive circuit 52, a first drive control circuit 53 and a first drive control circuit 53 for driving and controlling the first and second drive circuits 51 and 52, respectively. A two-drive control circuit 54 is mounted. Furthermore, an ECU (electronic control unit) 55 that controls the first drive control circuit 53 and the second drive control circuit 54 is mounted on the rear side of the circuit board 50.

  On the other hand, on the side of the rear cover wall 21a of the circuit board 50, a rotation sensor 56 is mounted on the circuit board 50 so as to face the rotation shaft 25 protruding in the axial direction from the rear cover wall 21a to the rear side. The rotation sensor 56 includes a Hall IC, and detects the rotation angle of the detection magnet 57 that rotates integrally with the rotation shaft 25 fixed to the shaft end surface of the rotation shaft 25.

In addition, U-phase, V-phase, and W-phase first output terminals Tu1, Tv1, and Tw1 are provided on the upper side of the circuit board 50 on the rear cover wall 21a side.
The U-phase first output terminal Tu1 is connected to the leading start end U1a of the first U-phase winding U1 led out from the fifth bus bar B5 via the rear cover wall 21a, and the first U-phase winding from the U-phase first output terminal Tu1. The first U-phase power supply voltage Vu1 is applied to the drawing start end U1a of the line U1.

  The V-phase first output terminal Tv1 is connected to the lead-out start end V1a of the first V-phase winding V1 led out from the second bus bar B2 via the rear cover wall 21a, and the first V-phase winding from the V-phase first output terminal Tv1. The first V-phase power supply voltage Vv1 is applied to the drawing start end V1a of the line V1.

  The W-phase first output terminal Tw1 is connected to the leading start end W1a of the first W-phase winding W1 led out from the sixth bus bar B6 via the rear cover wall 21a, and is connected to the first W-phase winding from the W-phase first output terminal Tw1. The first W-phase power supply voltage Vw1 is applied to the drawing start end W1a of the line W1.

Further, U-phase, V-phase, and W-phase second output terminals Tu2, Tv2, and Tw2 are provided on the lower side of the circuit board 50 on the rear cover wall 21a side.
The U-phase second output terminal Tu2 is connected to the lead-out start end U3a of the third U-phase winding U3 led out from the eleventh bus bar B11 via the rear cover wall 21a, and is connected to the third U-phase winding from the U-phase second output terminal Tu2. The second U-phase power supply voltage Vu2 is applied to the drawing start end U3a of the line U3.

  The V-phase second output terminal Tv2 is connected to the lead-out start end V3a of the third V-phase winding V3 led out from the twelfth bus bar B12 via the rear cover wall 21a, and is connected to the third V-phase winding from the V-phase second output terminal Tv2. The second V-phase power supply voltage Vv2 is applied to the drawing start end V3a of the line V3.

  The W-phase second output terminal Tw2 is connected to the leading start end W3a of the third W-phase winding W3 led out from the ninth bus bar B9 through the rear cover wall 21a, and is connected to the third W-phase winding from the W-phase second output terminal Tw2. The second W-phase power supply voltage Vw2 is applied to the drawing start end W3a of the line W3.

Next, the electrical configuration of the brushless motor M will be described with reference to FIG.
As shown in FIG. 10, the first system three-phase winding S1 is supplied from the first drive circuit 51 to a three-phase AC power source, that is, a first U-phase power source voltage Vu1, a first V-phase power source voltage Vv1, and a first W-phase power source voltage Vw1. Is applied. The first drive circuit 51 is a three-phase inverter circuit, and has six first to sixth switching elements Q1 to Q6 made of N-channel MOS transistors.

  In the first drive circuit 51, a series circuit of switching elements Q1, Q2 for U phase, a series circuit of switching elements Q3, Q4 for V phase, and a series circuit of switching elements Q5, Q6 for W phase are parallel. The DC voltage Vdd from the DC power supply G is applied.

The connection point N1 between the switching element Q1 for U phase and the switching element Q2 is connected to the leading end portion U1a of the first U phase winding U1 via the U phase first output terminal Tu1.
A connection point N2 between the V-phase switching element Q3 and the switching element Q4 is connected to the lead-out start end V1a of the first V-phase winding V1 via the V-phase first output terminal Tv1.

A connection point N3 between the W-phase switching element Q5 and the switching element Q6 is connected to the leading start end W1a of the first W-phase winding V1 via the W-phase first output terminal Tw1.
Drive signals SG1 to SG6 from the first drive control circuit 53 are input to the gate terminals of the first to sixth switching elements Q1 to Q6, respectively. Then, based on the drive signals SG1 to SG6 from the first drive control circuit 53, the switching elements Q1 to Q6 are turned on / off at a predetermined timing, and the first drive circuit 51 receives the DC voltage Vdd of the DC power supply G. The three-phase AC power supply voltages Vu1, Vv1, and Vw1 are converted and supplied to the first system three-phase winding S1. As a result, a rotating magnetic field generated by the first system three-phase winding S <b> 1 is generated in the stator 24.

  As shown in FIG. 10, the second system three-phase winding S2 is connected to the three-phase AC power source from the second drive circuit 52, that is, the second U-phase power source voltage Vu2, the second V-phase power source voltage Vv2, and the second W-phase power source voltage Vw2. Is applied. The second drive circuit 52 is a three-phase inverter circuit, and has six seventh to twelfth switching elements Q7 to Q12 made of N-channel MOS transistors.

  In the second drive circuit 52, a series circuit of U-phase switching elements Q7 and Q8, a series circuit of V-phase switching elements Q9 and Q10, and a series circuit of W-phase switching elements Q11 and Q12 are parallel. The DC voltage Vdd from the DC power supply G is applied.

The connection point N4 between the switching element Q7 for U phase and the switching element Q8 is connected to the leading end portion U3a of the third U phase winding U3 via the U phase second output terminal Tu2.
A connection point N5 between the V-phase switching element Q9 and the switching element Q10 is connected to the lead-out start end V3a of the third V-phase winding V3 via the V-phase second output terminal Tv2.

A connection point N6 between the switching element Q11 for W phase and the switching element Q12 is connected to the leading end W3a of the third W phase winding V3 via the W phase second output terminal Tw2.
Drive signals SG7 to SG12 from the second drive control circuit 54 are input to the gate terminals of the seventh to twelfth switching elements Q7 to Q12, respectively. Then, based on the drive signals SG7 to SG12 from the second drive control circuit 54, the respective switching elements Q7 to Q12 are turned on / off at a predetermined timing, and the second drive circuit 52 applies the DC voltage Vdd of the DC power supply G. The three-phase AC power supply voltages Vu2, Vv2, and Vw2 are converted and supplied to the second system three-phase winding S2. As a result, a rotating magnetic field is generated in the stator 24 by the second system three-phase winding S2.

  Here, the first drive control circuit 53 and the second drive control circuit 54 generate and output drive signals SG1 to SG12 at predetermined timings based on command signals from the ECU 55, respectively.

  The drive signals SG7 and SG8 output to the gate terminals of the switching element Q7 and the switching element Q8, respectively, and the drive signals SG1 and SG2 output to the gate terminals of the switching element Q1 and the switching element Q2 are synchronized, respectively. This is a drive signal.

  Further, the drive signals SG9 and SG10 output to the gate terminals of the switching element Q9 and the switching element Q10 and the drive signals SG3 and SG4 output to the gate terminals of the switching element Q3 and the switching element Q4, respectively, are synchronized. This is a drive signal.

  Similarly, drive signals SG11 and SG12 output to the gate terminals of switching element Q11 and switching element Q12, respectively, and drive signals SG5 and SG6 output to the gate terminals of switching element Q5 and switching element Q6, respectively, are synchronized. Drive signal.

  Accordingly, the first U-phase power supply voltage Vu1 and the second U-phase power supply voltage Vu2, the first V-phase power supply voltage Vv1 and the second V-phase power supply voltage Vv2, and the first W-phase power supply voltage Vw1 and the second W-phase power supply voltage Vw2 are synchronized. AC power supply voltage. That is, energization is simultaneously performed on the same-phase windings of the first system three-phase winding S1 and the second system three-phase winding S2.

Next, the operation of the brushless motor M configured as described above will be described.
Now, when the steering wheel 2 is operated, the input shaft 3a rotates, and a torsion bar provided between the input shaft 3a and the output shaft 3b is twisted. The torsion angle of the torsion bar is detected by a torque sensor (not shown), and the steering torque applied to the input shaft 3a is detected. Then, based on the detected steering torque, an assist torque for steering operation is calculated, and the brushless motor M is driven and controlled.

  At this time, based on the calculated assist torque and the detection signal from the rotation sensor 56, the ECU 55 corresponds to the first to twelfth corresponding drive signals SG1 to SG12 via the first and second drive control circuits 53 and 54, respectively. The brushless motor M is driven by outputting to the switching elements Q1 to Q12.

  When one of the first system three-phase winding S1 or the second system three-phase winding S2 is disconnected, a rotating magnetic field is generated by each of the first and second drive circuits 51 and 52 independent of each other. Therefore, even if one system three-phase winding is disconnected, rotation can be maintained by the other system three-phase winding.

  Further, the first and second U-phase windings U1 and U2, the first and second V-phase windings V1 and V2, the first and second W-phase windings W1 and W2 of the first system three-phase winding S1 are By connecting the first and sixth bus bars B1 to B6 spaced apart from each other to the bus bar holder 35, the connecting wires connecting the windings are eliminated. As a result, there is no possibility that the crossover will bite into the rotor 26.

  Similarly, the third and fourth U-phase windings U3 and U4, the third and fourth V-phase windings V3 and V4, and the third and fourth W-phase windings W3 and W4 of the second system three-phase winding S2 are By connecting the two bus bar holders 36 via the seventh to twelfth bus bars B7 to B12 spaced apart from each other, the connecting wire connecting the windings is eliminated. As a result, there is no possibility that the crossover will bite into the rotor 26.

  Furthermore, the first bus bar holder 35 and the second bus bar holder 36 form semicircular arc-shaped accommodating spaces 35d and 36d on the stator core 30 side, respectively, and the accommodating spaces 35d and 36d correspond to the first and second corresponding spaces, respectively. A protruding portion (coil end) is accommodated on the rear side from the stator core 30 of the second system three-phase windings S1 and S2. As a result, the protruding portions (coil ends) of the first and second system three-phase windings S1 and S2 do not come into contact with the rotor 26 even if they collapse.

  Further, the first system three-phase winding S1 and the second system three-phase winding S2 are concentrated windings and are formed at 180 ° symmetrical positions (axisymmetric about the central axis L1 of the rotating shaft 25). Then, the first system three-phase winding S1 is turned clockwise in FIG. 3 in the first U-phase winding U1 → second U-phase winding U2 → first V-phase winding V1 → second V-phase winding V2 → first W-phase. The teeth 31 were wound by concentrated winding in the order of the winding W1 → the second W-phase winding W2. Further, the second system three-phase winding S2 is connected to the third U-phase winding U3 → the fourth U-phase winding U4 → the third V-phase winding V3 → the fourth V-phase winding V4 → the third W-phase in the clockwise direction in FIG. Winding was performed by concentrated winding in the order of the winding W3 → the fourth W-phase winding W4.

  As a result, as shown in FIG. 5, the first bus bar holder 35 and the second bus bar holder 36 have the same semicircular arc shape centered on the central axis L <b> 1 of the rotation shaft 25. The first to twelfth bus bars B1 to B12 are concentric arcs centered on the central axis L1 of the rotation shaft 25. The first to fourth bus bars B1 to B4 of the first system three-phase winding S1 and the seventh to tenth bus bars B7 to B10 of the second system three-phase winding S2 have the same shape. Further, the fifth bus bar B5 of the first system three-phase winding S1 and the eleventh bus bar B11 of the second system three-phase winding S2 have the same shape. Further, the sixth bus bar B6 of the first system three-phase winding S1 and the twelfth bus bar B12 of the second system three-phase winding S2 have the same shape.

Next, the effect of the said embodiment is described below.
(1) According to this embodiment, even if one of the first and second system three-phase windings S1 and S2 is disconnected, the other system three-phase winding The rotation can be maintained, and high reliability with respect to the malfunction of the brushless motor M can be obtained.

  Therefore, even if one of the three-phase windings of the system becomes inoperative during the steering operation, the brushless motor M is driven by the other three-phase windings of the system, and the assist torque can be continuously applied to the steering wheel 2.

  (2) According to the present embodiment, the first to twelfth bus bars B1 to B12 can eliminate the connecting wire connecting the windings in the first and second system three-phase windings S1 and S2, and The problem of the crossover biting into the rotor 26 is solved.

(3) According to this embodiment, the first to twelfth bus bars B1 to B12 are formed in an arc shape, and the first and second bus bar holders 35 and 36 are also formed in an arc shape. That is, since the shape conforms to the shape of the stator core 30, the first to twelfth bus bars B1 to B12 and the first and second bus bar holders 35 and 36 can be accommodated in the motor housing 21 in a compact manner and have a small physique. M can be realized.

  Moreover, since the first to twelfth bus bars B1 to B12 are adjacent to each other in the radial direction and the circumferential direction, the reliability of the bus bars can be ensured without short-circuiting each other.

  (4) According to the present embodiment, the drawing start end and the drawing end of each of the windings U1 to U4, V1 to V4, W1 to W4 are drawn in a short distance in the axial direction, and the corresponding first to twelfth busbars. Since it is connected to B1 to B12, it is wired compactly without handling complicated wiring. As a result, a brushless motor M having a small physique can be realized.

  (5) According to the present embodiment, the protruding portions (coil ends) of the first and second system three-phase windings S1, S2 are accommodated in the accommodating spaces 35d, 36d of the first and second bus bar holders 35, 36. Therefore, there is no possibility of contacting the rotor 26 even if the windings are broken.

  (6) According to the present embodiment, in the first system three-phase winding S1, the extraction start end U1a of the first U-phase winding U1, the extraction start end V1a of the first V-phase winding V1, and the first W Only three of the drawing start ends W1a of the phase winding W1 were drawn into the receiving box 23 as receiving wires. Further, in the second system three-phase winding S2, the extraction start end U3a of the third U-phase winding U3, the extraction start end V3a of the third V-phase winding V3, and the extraction start end of the third W-phase winding W3 Only three of W3a were drawn into the storage box 23 as receiving wires.

  Therefore, since a total of six receiving wires are only drawn from the motor housing 21 in the housing box 23, the wiring space can be made very small and wiring to the circuit board 50 is facilitated.

(7) According to the present embodiment, the shapes of the first and second bus bar holders 35 and 36 can be made to be the same semicircular arc shape, so that the parts can be shared and the number of parts can be reduced.
(8) According to the present embodiment, the first to fourth bus bars B1 to B4 of the first system three-phase winding S1 and the seventh to tenth bus bars B7 to B10 of the second system three-phase winding S2 have the same shape. Thus, the parts can be shared and the number of parts can be reduced. Further, the fifth bus bar B5 of the first system three-phase winding S1 and the eleventh bus bar B11 of the second system three-phase winding S2 have the same shape, so that the parts can be shared and the number of parts can be reduced. Further, the sixth bus bar B6 of the first system three-phase winding S1 and the twelfth bus bar B12 of the second system three-phase winding S2 have the same shape, so that parts can be shared and the number of parts can be reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in the connection structure of the first system three-phase winding S1 and the second system three-phase winding S2. That is, the first embodiment is a delta connection, but the present embodiment is characterized by a star connection. Therefore, the characteristic part will be described in detail, and the common part will be omitted for convenience of description.

  As shown in FIG. 11, the first system three-phase winding S <b> 1 and the second system three-phase winding S <b> 2 are concentrated windings with respect to the stator core 30 and are 180 ° symmetrical positions (at the central axis L <b> 1 of the rotating shaft 25). Axisymmetric). That is, in the same way as in the first embodiment, in FIG. 11, the first system three-phase winding S1 is wound around the six teeth 31 in the upper half, and the second system three phases are wound around the six teeth 31 in the lower half. Winding S2 is wound.

  The first system three-phase winding S1 is the first V-phase winding V1 → second V-phase winding V2 → second U-phase winding U2 → first U-phase winding U1 → second W-phase in the clockwise direction in FIG. It is wound by concentrated winding on the corresponding teeth 31 in the order of the winding W2 → the first W-phase winding W1.

  As a result, the accommodation space 35d of the first bus bar holder 35 has a first V-phase winding V1, a second V-phase winding V2, a second U-phase winding U2, a first U-phase winding U1, a second W-phase winding W2. The rear protruding portion (coil end) is accommodated in the first W-phase winding W1.

  Incidentally, as in the first embodiment, the first U-phase winding U1 is wound in the reverse direction, the second U-phase winding U2 is wound in the forward direction, and the first and second U-phase windings U1, U2 are drawn out. The start ends U1a and U2a and the draw end portions U1b and U2b are drawn out to the rear side. The first V-phase winding V1 is wound in the forward direction, the second V-phase winding V2 is wound in the reverse direction, and the leading and trailing end portions V1a and V2a and the leading end of the first and second V-phase windings V1 and V2 are wound. The parts V1b and V2b are drawn out to the rear side. Further, the first W-phase winding W1 is wound in the reverse direction, the second W-phase winding W2 is wound in the forward direction, and the drawing start ends W1a, W2a and the drawing end of the first and second W-phase windings W1, W2 are wound. The parts W1b and W2b are drawn out to the rear side.

  As shown in FIG. 13, the first base portion 35a of the first bus bar holder 35 is a position in which the windings V1, V2, U2, U1, W2, and W1 are accommodated at a predetermined radial position. Are respectively provided with lead-out start through holes H1a, H2a, H3a, H4a, H5a, H6a and lead-out terminal through holes H1b, H2b, H3b, H4b, H5b, H6b.

  At this time, in the clockwise direction in FIG. 13, the drawing start end through hole H1a → the drawing end through hole H1b → the drawing end through hole H2b → the drawing start end through hole H2a → the drawing end through hole H3b → the drawing start end through hole H3a → the drawing start end through. A hole H4a, a drawing end through hole H4b, a drawing start end through hole H5a, a drawing end through hole H5b, a drawing end end through hole H6b, and a drawing start end through hole H6a are formed in this order.

  The lead-out start end through hole H1a is formed at a position corresponding to the first V-phase winding V1 and penetrating the inner circumferential line Li perpendicular to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V1a of the 1st V-phase coil | winding V1 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H1a.

  Next, the lead-out terminal through hole H1b is formed at a position corresponding to the first V-phase winding V1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V1b of the 1st V-phase coil | winding V1 is made to project to the rear side of the 1st base part 35a via the drawer | drawer termination through-hole H1b.

  Next, the lead-out terminal through hole H2b is formed at a position corresponding to the second V-phase winding V2 and through the outer peripheral line Lo so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V2b of the 2nd V-phase coil | winding V2 is protruded to the rear side of the 1st base part 35a via the drawer | drawer termination through-hole H2b.

  Next, the lead-out start end through hole H2a is formed at a position corresponding to the second V-phase winding V2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V2a of the 2nd V-phase coil | winding V2 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H2a.

  Next, the lead-out terminal through hole H3b is formed at a position corresponding to the second U-phase winding U2 so as to be perpendicular to the outer peripheral line Lo in the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U2b of the 2nd U-phase coil | winding U2 is protruded to the rear side of the 1st base part 35a via the drawer | drawer termination | terminus through-hole H3b.

  Next, the lead-out start end through hole H3a is formed at a position corresponding to the second U-phase winding U2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part U2a of the 2nd U-phase coil | winding U2 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H3a.

  Next, the lead-out start end through hole H4a is formed at a position corresponding to the first U-phase winding U1 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part U1a of the 1st U-phase coil | winding U1 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H4a.

  Next, the leading end through hole H4b is formed at a position corresponding to the first U-phase winding U1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U1b of the 1st U-phase coil | winding U1 is protruded to the rear side of the 1st base part 35a via the drawer | drawer termination | terminus through-hole H4b.

  Next, the lead-out start end through hole H5a is formed at a position corresponding to the second W-phase winding W2 and through the inner peripheral line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W2a of the 2nd W-phase coil | winding W2 is protruded to the rear side of the 1st base part 35a via the drawer | drawing-out start end through-hole H5a.

  Next, the lead-out terminal through hole H5b is formed at a position corresponding to the second W-phase winding W2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W2b of the 2nd W-phase coil | winding W2 is protruded to the rear side of the 1st base part 35a via the drawer | drawer termination through-hole H5b.

  Next, the lead-out terminal through hole H6b is formed at a position corresponding to the first W-phase winding W1 and through the outer peripheral line Lo so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W1b of the 1st W-phase coil | winding W1 is protruded to the rear side of the 1st base part 35a via the drawer | drawer termination | terminus through-hole H6b.

  Next, the lead-out start end through hole H6a is formed at a position corresponding to the first W-phase winding W1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawing start end part W1a of the 1st W phase coil | winding W2 is made to protrude in the rear side of the 1st base part 35a via the drawing start end through-hole H6a.

As shown in FIG. 12, a plurality of arc-shaped bus bars B1 to B4 are arranged on the rear side surface of the first base portion 35a along the outer peripheral line Lo and the intermediate line Lc.
More specifically, the first to fourth bus bars B1 to B4 are round conductive wires (for example, enameled wires) with insulation coating, and the first to third bus bars B1 to B3 are arranged in three on the intermediate line Lc. One fourth bus bar B4 is disposed on B3 and the outer peripheral line Lo.

  The first bus bar B1 electrically connects the leading end portion V1b of the first V-phase winding V1 protruding from the leading end through hole H1b and the leading end portion V2a of the second V phase winding V2 protruding from the leading start end through hole H2a. It is a bus bar to be connected. At this time, the first bus bar B1 is disposed along the intermediate line Lc between the drawing termination portion V1b and the drawing start end portion V2a, and the connection portion between the drawing termination portion V1b and the drawing start end portion V2a is welded electrically. Connecting.

  The second bus bar B2 electrically connects the lead start end portion U2a of the second U-phase winding U2 protruding from the lead start end through hole H3a and the lead end portion U1b of the first U phase winding U1 protruding from the lead end through hole H4b. It is a bus bar to be connected. At this time, the second bus bar B2 is disposed along the intermediate line Lc between the drawer start end U2a and the drawer end U1b, and is electrically connected by welding the connection portion between the drawer start end U2a and the drawer end U1b. Connecting.

  The third bus bar B3 electrically connects the leading end portion W2b of the second W-phase winding W2 protruding from the leading end through hole H5b and the leading end portion W1a of the first W phase winding W1 protruding from the leading start end through hole H6a. It is a bus bar to be connected. At this time, the third bus bar B3 is disposed along the intermediate line Lc between the drawing end portion W2b and the drawing start end portion W1a, and electrically connects the connection portion between the drawing end portion W2b and the drawing start end portion W1a. Connecting.

  The fourth bus bar B4 includes a lead end portion V2b of the second V-phase winding V2 protruding from the lead end through hole H2b, a lead end portion U2b of the second U phase winding U2 protruding from the lead end through hole H3b, and a lead This is a bus bar that electrically connects the leading end portion W1b of the first W-phase winding W1 protruding from the terminal through hole H6b. At this time, the fourth bus bar B4 is disposed along the outer peripheral line Lo between the drawer termination portion V2b, the drawer termination portion U2b, and the drawer termination portion W1b, and the drawer termination portion V2b, the drawer termination portion U2b, and the drawer termination portion W1b. Weld the connection part of and connect it electrically.

  It should be noted that the drawing start end portion V1a of the first V-phase winding V1 drawn out from the drawing start end through hole H1a passes through the through hole 21b formed in the rear cover wall 21a without being connected to the bus bar, and is led out to the storage box 23. . As in the first embodiment, the first V-phase power supply voltage Vv1 is applied from the first drive circuit 51 as shown in FIG.

  Similarly, the drawing start end U1a of the first U-phase winding U1 drawn out from the drawing start end through hole H4a passes through the through hole 21b formed in the rear cover wall 21a without being connected to the bus bar, and is led out to the storage box 23. The As in the first embodiment, the first U-phase power supply voltage Vu1 is applied from the first drive circuit 51 as shown in FIG.

  Similarly, the drawing start end portion W2a of the second W-phase winding W2 drawn from the drawing start end through hole H5a passes through the through hole 21b formed in the rear cover wall 21a without being connected to the bus bar, and is led out to the storage box 23. The As in the first embodiment, the first W-phase power supply voltage Vw1 is applied from the first drive circuit 51 as shown in FIG.

As a result, the first system three-phase winding S1 of this embodiment has a star connection winding structure as shown in FIG.
On the other hand, the second system three-phase winding S2 is the fourth V-phase winding V4 → the third V-phase winding V3 → the third U-phase winding U3 → the fourth U-phase winding U4 → the third W-phase in the clockwise direction in FIG. It is wound by concentrated winding on the corresponding teeth 31 in the order of the winding W3 → the fourth W-phase winding W4.

  As a result, in the accommodation space 36d of the second bus bar holder 36, the fourth V-phase winding V4 → the third V-phase winding V3 → the third U-phase winding U3 → the fourth U-phase winding U4 → the third W-phase winding W3 → A protruding portion (coil end) is accommodated on the rear side in the arrangement of the fourth W-phase winding W4.

  Incidentally, as in the first embodiment, the third U-phase winding U3 is wound in the forward winding, the fourth U-phase winding U4 is wound in the reverse winding, and the third and fourth U-phase windings U3 and U4 are drawn out. The start end portions U3a and U4a and the draw end portions U3b and U4b are each drawn out to the rear side. The third V-phase winding V3 is wound in the reverse direction, the fourth V-phase winding V4 is wound in the forward direction, and the leading and trailing end portions V3a and V4a and the leading end of the third and fourth V-phase windings V3 and V4 are wound. The parts V3b and V4b are drawn out to the rear side. Further, the third W-phase winding W3 is wound in the forward winding, the fourth W-phase winding W4 is wound in the reverse winding, and the leading and trailing end portions W3a, W4a and the leading end of the third and fourth W-phase windings W3, W4 are wound. The parts W3b and W4b are each pulled out to the rear side.

  As shown in FIG. 14, in the second base portion 36a, the positions where the windings V4, V3, U3, U4, W3, W4 are accommodated and in the predetermined radial position are respectively passed through the drawing start end. Holes H7a, H8a, H9a, H10a, H11a, and H12a and lead-out terminal through holes H7b, H8b, H9b, H10b, H11b, and H12b are formed through the holes.

  At this time, in the clockwise direction in FIG. 14, the drawing end through hole H7b → the drawing start end through hole H7a → the drawing start end through hole H8a → the drawing end through hole H8b → the drawing start end through hole H9a → the drawing end through hole H9b → the drawing end through hole. A hole H10b, a drawing start end through hole H10a, a drawing end through hole H11b, a drawing start end through hole H11a, a drawing start end through hole H12a, and a drawing end through hole H12b are formed in this order.

  The leading end through hole H7b is formed at a position corresponding to the fourth V-phase winding V4 and penetrating the outer peripheral line Lo perpendicular to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V4b of the 4th V-phase coil | winding V4 is protruded to the rear side of the 2nd base part 36a via the drawer | drawer termination through-hole H7b.

  Next, the lead-out start end through hole H7a is formed at a position corresponding to the fourth V-phase winding V4 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V4a of the 4th V-phase coil | winding V4 is protruded to the rear side of the 2nd base part 36a via the drawer | drawing-out start end through-hole H7a.

  Next, the drawing start end through hole H8a is formed at a position corresponding to the third V-phase winding V3 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the extraction | drawer start end part V3a of the 3rd V-phase coil | winding V3 is made to protrude in the rear side of the 2nd base part 36a via the extraction | drawer start end through-hole H8a.

  Next, the lead-out terminal through hole H8b is formed at a position corresponding to the third V-phase winding V3 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V3b of the 3rd V-phase coil | winding V3 is protruded to the rear side of the 2nd base part 36a via the drawer | drawer termination through-hole H8b.

  Next, the lead-out starting end through hole H9a is formed at a position corresponding to the third U-phase winding U3 so as to penetrate the inner circumferential line Li perpendicular to the axial direction. And the front-end | tip part of the extraction | drawer start end part U3a of the 3rd U-phase coil | winding U3 is made to protrude in the rear side of the 2nd base part 36a via the extraction | drawer start end through-hole H9a.

  Next, the lead-out terminal through hole H9b is formed at a position corresponding to the third U-phase winding U3 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U3b of the 3rd U-phase coil | winding U3 is made to project to the rear side of the 2nd base part 36a via the drawer | drawer termination | terminus through-hole H9b.

  Next, the leading end through hole H10b is formed at a position corresponding to the fourth U-phase winding U4 and penetrating the outer peripheral line Lo perpendicular to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U4b of the 4th U-phase coil | winding U4 is made to protrude in the rear side of the 2nd base part 36a via the drawer | drawer termination | terminus through-hole H10b.

  Next, the drawing start end through hole H10a is formed at a position corresponding to the fourth U-phase winding U4 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the extraction | drawer start end part V4a of the 4th U-phase coil | winding U4 is protruded to the rear side of the 2nd base part 36a via the extraction start end through-hole H10a.

  Next, the lead-out terminal through hole H11b is formed at a position corresponding to the third W-phase winding W3 and through the outer peripheral line Lo so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W3b of the 3rd W-phase coil | winding W3 is protruded to the rear side of the 2nd base part 36a via the drawer | drawer termination | terminus through-hole H11b.

  Next, the lead-out start end through hole H11a is formed so as to penetrate the intermediate line Lc at a position corresponding to the third W-phase winding W3 and perpendicular to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W3a of the 3rd W-phase coil | winding W3 is protruded to the rear side of the 2nd base part 36a through the drawer | drawing-out start end through-hole H11a.

  Next, the lead-out start end through hole H12a is formed at a position corresponding to the fourth W-phase winding W4 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W4a of the 4th W-phase coil | winding W4 is protruded to the rear side of the 2nd base part 36a via the drawer | drawing-out start end through-hole H12a.

  Next, the lead-out terminal through hole H12b is formed at a position corresponding to the fourth W-phase winding W4 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W4b of the 4th W-phase coil | winding W4 is protruded to the rear side of the 2nd base part 36a via the drawer | drawer termination through-hole H12b.

  As shown in FIG. 12, a plurality of arc-shaped bus bars B <b> 5 to B <b> 8 are arranged on the rear side surface of the second base portion 36 along the outer peripheral line Lo and the intermediate line Lc. The fifth to eighth bus bars B5 to B8 are insulation-coated round wire conductors (for example, enameled wires), and the fifth to seventh bus bars B5 to B7 and the outer peripheral line are arranged in three on the intermediate line Lc. One eighth bus bar B8 is arranged on Lo.

  The fifth bus bar B5 electrically connects the lead start end portion V4a of the fourth V-phase winding V4 protruding from the lead start end through hole H7a and the lead end portion V3b of the third V phase winding V3 protruding from the lead end through hole H8b. It is a bus bar to be connected. At this time, the fifth bus bar B5 is disposed along the intermediate line Lc between the drawing start end V4a and the drawing end V3b, and is electrically connected by welding the connecting portion between the drawing start end V4a and the drawing end V3b. Connecting.

  The sixth bus bar B6 electrically connects the leading end portion U3b of the third U-phase winding U3 protruding from the leading end through hole H9b and the leading end portion U4a of the fourth U phase winding U4 protruding from the leading start end through hole H10a. It is a bus bar to be connected. At this time, the sixth bus bar B6 is disposed along the intermediate line Lc between the pull-out end portion U3b and the pull-out start end portion U4a, and is electrically connected by welding the connecting portion between the pull-out end portion U3b and the pull-out start end portion U4a. Connecting.

  The seventh bus bar B7 electrically connects the lead start end W3a of the third W phase winding W3 protruding from the lead start end through hole H11a and the lead end portion W4b of the fourth W phase winding W4 protruding from the lead end through hole H12b. It is a bus bar to be connected. At this time, the seventh bus bar B7 is disposed along the intermediate line Lc between the drawer start end W3a and the drawer end W4b, and is electrically connected by welding the connection portion between the drawer start end W3a and the drawer end W4b. Connecting.

  The eighth bus bar B8 includes a lead end portion V4b of the fourth V-phase winding V4 protruding from the lead end through hole H7b, a lead end portion U4b of the fourth U phase winding U4 protruding from the lead end through hole H10b, and a lead This is a bus bar that electrically connects the leading end portion W4b of the fourth W-phase winding W4 protruding from the terminal through hole H12b. At this time, the eighth bus bar B8 is disposed along the outer periphery Lo between the drawer termination portion V4b, the drawer termination portion U4b, and the drawer termination portion W4b, and the drawer termination portion V4b, the drawer termination portion U4b, and the drawer termination portion W4b. Weld the connection part of and connect it electrically.

  It should be noted that the drawing start end V3a of the third V-phase winding V3 drawn from the drawing start end through hole H8a passes through the through hole 21b formed in the rear cover wall 21a without being connected to the bus bar, and is led out to the storage box 23. . As in the first embodiment, the second V-phase power supply voltage Vv2 is applied from the second drive circuit 52 as shown in FIG.

  Similarly, the drawing start end U3a of the third U-phase winding U3 drawn out from the drawing start end through hole H9a passes through the through hole 21b formed in the rear cover wall 21a without being connected to the bus bar, and is led out to the storage box 23. The As in the first embodiment, the second U-phase power supply voltage Vu2 is applied from the second drive circuit 52 as shown in FIG.

  Similarly, the drawing start end W4a of the fourth W-phase winding W4 drawn out from the drawing start end through hole H12a passes through the through hole 21b formed in the rear cover wall 21a without being connected to the bus bar, and is led out to the storage box 23. The As in the first embodiment, the second W-phase power supply voltage Vw2 is applied from the second drive circuit 52 as shown in FIG.

As a result, the second system three-phase winding S2 of the present embodiment has a star-connected winding structure as shown in FIG.
As described above in detail, even if the first system three-phase winding S1 and the second system three-phase winding S2 of the present embodiment have a star connection structure, the same effect as the first embodiment can be achieved. In addition to the effects (1) to (6) of the embodiment, the number of bus bars can be reduced. In addition, the shape of the bus bar of the corresponding phase in each of the first and second system three-phase windings S1 and S2 can be the same arc shape, so that the parts can be shared and the number of parts can be reduced.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in the arrangement structure of the first system three-phase winding S1 and the second system three-phase winding S2. Therefore, the characteristic part will be described in detail, and the common part will be omitted for convenience of description.

  As shown in FIG. 18, in the first system three-phase winding S1, a set of second and first U-phase windings U2 and U1 having the same phase and first and second V-phase windings V1 and V1, respectively, in the clockwise direction. A set of V2 and a set of second and first W-phase windings W2 and W1 are arranged at equiangular intervals of 120 °. That is, each group is arranged with two teeth 31 open.

  The third of the second system three-phase winding S2 is clockwise between the set of the second and first U-phase windings U2 and U1 and the set of the first and second V-phase windings V1 and V2. And the group of 4th W phase winding W3, W4 is arrange | positioned.

  In addition, the third of the second system three-phase winding S2 is clockwise between the first and second V-phase windings V1 and V2 and the second and first W-phase windings W2 and W1. And the group of 4th U-phase coil | winding U3, U4 is arrange | positioned.

  Further, the fourth of the second system three-phase winding S2 is clockwise between the second and first W-phase windings W2 and W1 and the second and first U-phase windings U2 and U1. And a set of third V-phase windings V4 and V3.

  That is, also in the second system three-phase winding S2, in the clockwise direction, a set of third and fourth W-phase windings W3 and W4 having the same phase, and a set of third and fourth U-phase windings U3 and U4, respectively. The fourth and third V-phase windings V4 and V3 are arranged at equiangular intervals of 120 °.

  As shown in FIG. 19, an annular bus bar holder 38 is disposed on the rear side of the stator core 30. In this embodiment, the annular bus bar holder 38 is a holder having an annular shape in which the first bus bar holder 35 and the second bus bar holder 36 of the first embodiment are integrated, and the annular base 38a of the annular bus bar holder 38 is also formed. The first base portion 35a and the second base portion 36a are integrated into an annular shape. Accordingly, similarly, the outer peripheral wall portion 38b and the inner peripheral wall portion 38c of the annular bus bar holder 38 have an annular shape, and the accommodation space 38d has an annular shape with a U-shaped cross section.

As a result, the rear-side protruding portions (coil ends) of the first system three-phase winding S1 and the second system three-phase winding S2 are accommodated in the accommodation space 38d of the annular bus bar holder 38.
On the side surface in the axial direction of the annular base portion 38a, there are lead start end through holes H1a, H2a, H3a, H4a, H5a, H6a and lead end through holes H1b, H2b, H3b, H4b for the first system three-phase winding S1. , H5b, and H6b are formed penetrating each other.

  At this time, in the clockwise direction in FIG. 20, the drawing start end through hole H1a → the drawing end through hole H1b → the drawing end through hole H2b → the drawing start end through hole H2a → the drawing start end through hole H3a → the drawing end through hole H3b → the drawing end through hole. A hole H4b, a drawing start end through hole H4a, a drawing start end through hole H5a, a drawing end through hole H5b, a drawing end end through hole H6b, and a drawing start end through hole H6a are formed in this order.

  The lead-out starting end through hole H1a is formed at a position corresponding to the second U-phase winding U2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part U2a of the 2nd U-phase coil | winding U2 is protruded to the rear side of the cyclic | annular base part 38a through the drawing start-end through-hole H1a.

  Next, the lead-out terminal through hole H1b is formed at a position corresponding to the second U-phase winding U2 so as to be perpendicular to the inner peripheral line Li in the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U2b of the 2nd U-phase coil | winding U2 is made to project to the rear side of the annular base part 38a via the drawer | drawer termination | terminus through-hole H1b.

  Next, the lead-out terminal through hole H2b is formed at a position corresponding to the first U-phase winding U1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U1b of the 1st U-phase coil | winding U1 is protruded to the rear side of the annular base part 38a via the drawer | drawer termination | terminus through-hole H2b.

  Next, the lead-out start end through hole H2a is formed at a position corresponding to the first U-phase winding U1 and through the inner peripheral line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part U1a of the 1st U-phase coil | winding U1 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H2a.

  Next, the lead-out start end through hole H3a is formed at a position corresponding to the first V-phase winding V1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V1a of the 1st V-phase coil | winding V1 is protruded to the rear side of the cyclic | annular base part 38a via the drawing start-end through-hole H3a.

  Next, the lead-out terminal through hole H3b is formed at a position corresponding to the first V-phase winding V1 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V1b of the 1st V-phase coil | winding V1 is protruded to the rear side of the annular base part 38a via the drawer | drawer termination | terminus through-hole H3b.

  Next, the lead-out terminal through hole H4b is formed at a position corresponding to the second V-phase winding V2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V2b of the 2nd V-phase coil | winding V2 is protruded to the rear side of the cyclic | annular base part 38a through the drawer | drawer termination | terminus through-hole H4b.

  Next, the drawing start end through hole H4a is formed at a position corresponding to the second V-phase winding V2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V2a of the 2nd V-phase coil | winding V2 is protruded to the rear side of the cyclic | annular base part 38a through the drawing start-end through-hole H4a.

  Next, the drawing start end through hole H5a is formed at a position corresponding to the second W-phase winding W2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W2a of the 2nd W-phase coil | winding W2 is protruded to the rear side of the cyclic | annular base part 38a via the drawing start-end through-hole H5a.

  Next, the lead-out terminal through hole H5b is formed at a position corresponding to the second W-phase winding W2 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W2b of the 2nd W-phase coil | winding W2 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination | terminus through-hole H5b.

  Next, the lead-out terminal through hole H6b is formed at a position corresponding to the first W-phase winding W1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W1b of the 1st W-phase coil | winding W1 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination through-hole H6b.

  Next, the lead-out start end through hole H6a is formed at a position corresponding to the first W-phase winding W1 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W1a of the 1st W-phase coil | winding W1 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H6a.

  As shown in FIG. 21, a plurality of arc-shaped bus bars B1 to B6 are disposed along the intermediate line Lc and the inner peripheral line Li on the side surface on the rear side of the annular base portion 38a. Three first to third bus bars B1 to B3 are arranged on the inner peripheral line Li, and three fourth to sixth bus bars B4 to B6 are arranged on the intermediate line Lc.

  The first bus bar B1 electrically connects the leading end portion U2b of the second U-phase winding U2 protruding from the leading end through hole H1b and the leading end portion U1a of the first U phase winding U1 protruding from the leading start end through hole H2a. It is a bus bar to be connected. At this time, 1st bus-bar B1 is arrange | positioned along the inner peripheral line Li between drawer | drawer termination | terminus part U2b and drawer | drawing-out start end U1a, and electrically connects drawer | drawer termination | terminus part V1b and drawer | drawing-out start part V2a.

  The second bus bar B2 electrically connects the leading end portion V1b of the first V-phase winding V1 protruding from the leading end through hole H3b and the leading end portion V2a of the second V phase winding V2 protruding from the leading start end through hole H4a. It is a bus bar to be connected. At this time, 2nd bus-bar B2 is arrange | positioned along inner peripheral line Li between drawer | drawer termination | terminus part V1b and drawer | drawing-out start part V2a, and electrically connects drawer | drawer termination | terminus part V1b and drawer | drawer start-end part V2a.

  The third bus bar B3 electrically connects the leading end portion W2b of the second W-phase winding W2 protruding from the leading end through hole H5b and the leading end portion W1a of the first W phase winding W1 protruding from the leading start end through hole H6a. It is a bus bar to be connected. At this time, 3rd bus-bar B3 is arrange | positioned along inner peripheral line Li between the drawer | drawer termination | terminus part W2b and the drawer | drawing-out start part W1a, and electrically connects the drawer | drawer termination part W2b and the drawer | drawer start end part W1a.

  The fourth bus bar B4 electrically connects the leading end portion U1b of the first U-phase winding U1 protruding from the leading end through hole H2b and the leading end portion V1a of the first V phase winding V1 protruding from the leading start end through hole H3a. It is a bus bar to be connected. At this time, 4th bus-bar B4 is arrange | positioned along the intermediate line Lc between the drawer | drawer termination | terminus part U1b and the drawer | drawer start end part V1a, and electrically connects with the drawer | drawer termination | terminus terminal part U1b and the drawer | drawer start end part V1a.

  Note that in the fourth bus bar B4, the leading end portion U1b of the first U-phase winding U1 is cut at the connecting portion with the fourth bus bar B4, whereas the leading end portion of the first V-phase winding V1 is cut off. V1a is further drawn from the connecting portion with the fourth bus bar B4 to the rear side in the rear axial direction. The leading end portion V1a of the first V-phase winding V1 with the tip portion pulled out to the rear side in the rear axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23 for the first drive. The first V-phase power supply voltage Vv1 is applied from the circuit 51.

  The fifth bus bar B5 electrically connects the lead end portion V2b of the second V-phase winding V2 protruding from the lead end through hole H4b and the lead start end W2a of the second W phase winding W2 protruding from the lead start end through hole H5a. It is a bus bar to be connected. At this time, the fifth bus bar B5 is disposed along the intermediate line Lc between the drawer termination portion V2b and the drawer start end portion W2a, and is electrically connected between the drawer termination portion V2b and the drawer start end portion W2a.

  In the fifth bus bar B5, the leading end V2b of the second V-phase winding V2 is cut at the connection portion with the fifth bus bar B5, whereas the leading end of the second W-phase winding W2 is cut off. W2a is further drawn from the connecting portion with the fifth bus bar B5 to the rear side in the rear axial direction. The leading end portion W2a of the second W-phase winding W2 with the tip portion pulled out to the rear side in the rear axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, so that the first drive The first W-phase power supply voltage Vw1 is applied from the circuit 51.

  The sixth bus bar B6 electrically connects the leading end portion W1b of the first W-phase winding W1 protruding from the leading end through hole H6b and the leading end portion U2a of the second U phase winding U2 protruding from the leading start end through hole H1a. It is a bus bar to be connected. At this time, the sixth bus bar B6 is disposed along the intermediate line Lc between the drawer end portion W1b and the drawer start end portion U2a, and is electrically connected between the drawer end portion W1b and the drawer start end portion U2a.

  In the sixth bus bar B6, the leading end portion of the leading end portion W1b of the first W-phase winding W1 is cut at the connection portion with the sixth bus bar B6, whereas the leading end portion of the second U-phase winding U2 is pulled out. U2a is further drawn from the connecting portion with the sixth bus bar B6 to the rear side in the rear axial direction. The leading end portion U2a of the second U-phase winding U2 with the leading end pulled out to the rear side in the axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, so that the first drive The first U-phase power supply voltage Vu1 is applied from the circuit 51.

As a result, the first system three-phase winding S1 has a delta-connected winding structure as shown in FIG.
Similarly, on the side surface in the axial direction of the annular base portion 38a, the drawing start end through holes H7a, H8a, H9a, H10a, H11a, H12a and the drawing end through holes H7b, H8b, H9b, H10b, H11b, and H12b are respectively formed through.

  At this time, in the clockwise direction in FIG. 20, the drawing start end through hole H7a → the drawing end through hole H7b → the drawing end through hole H8b → the drawing start end through hole H8a → the drawing start end through hole H9a → the drawing end through hole H9b → the drawing end through hole. A hole H10b, a drawing start end through hole H10a, a drawing start end through hole H11a, a drawing end through hole H11b, a drawing end through hole H12b, and a drawing start end through hole H12a are formed in this order.

  The lead-out starting end through hole H7a is formed at a position corresponding to the third U-phase winding U3 so as to be perpendicular to the outer peripheral line Lo in the axial direction. And the front-end | tip part of the drawer | drawing-out start end part U3a of the 3rd U-phase coil | winding U3 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H7a.

  Next, the lead-out terminal through hole H7b is formed at a position corresponding to the third U-phase winding U3 and through the inner peripheral line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U3b of the 3rd U-phase coil | winding U3 is made to protrude in the rear side of the annular base part 38a via the drawer | drawer termination | terminus through-hole H7b.

  Next, the leading end through hole H8b is formed at a position corresponding to the fourth U-phase winding U4 so as to penetrate the outer peripheral line Lo perpendicularly to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U4b of the 4th U-phase coil | winding U4 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination | terminus through-hole H8b.

  Next, the drawing start end through hole H8a is formed at a position corresponding to the fourth U-phase winding U4 so as to penetrate the inner circumferential line Li perpendicular to the axial direction. And the front-end | tip part of the drawer | drawing-out start-end part U4a of the 4th U-phase coil | winding U4 is protruded to the rear side of the annular base part 38a via the drawer | draw-out start end through-hole H8a.

  Next, the drawing start end through hole H9a is formed at a position corresponding to the fourth V-phase winding V4 and penetrating the outer peripheral line Lo perpendicular to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V4a of the 4th V-phase coil | winding V4 is protruded to the rear side of the cyclic | annular base part 38a through the drawing start end through-hole H9a.

  Next, the lead-out terminal through hole H9b is formed at a position corresponding to the fourth V-phase winding V4 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V4b of the 4th V-phase coil | winding V4 is protruded to the rear side of the annular base part 38a via the drawer | drawer termination through-hole H9b.

  Next, the lead-out terminal through hole H10b is formed at a position corresponding to the third V-phase winding V3 and through the outer peripheral line Lo so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V3b of the 3rd V-phase coil | winding V3 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination through-hole H10b.

  Next, the lead-out starting end through hole H10a is formed at a position corresponding to the third V-phase winding V3 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the extraction | drawer start end part V3a of the 3rd V-phase coil | winding V3 is made to project to the rear side of the annular base part 38a via the extraction start end through-hole H10a.

  Next, the lead-out starting end through hole H11a is formed at a position corresponding to the third W-phase winding W3 so as to be perpendicular to the outer peripheral line Lo in the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W3a of the 3rd W-phase coil | winding W3 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H11a.

  Next, the lead-out terminal through hole H11b is formed at a position corresponding to the third W-phase winding W3 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W3b of the 3rd W-phase coil | winding W3 is protruded to the rear side of the annular base part 38a through the drawer | drawer termination | terminus through-hole H11b.

  Next, the lead-out terminal through hole H12b is formed at a position corresponding to the fourth W-phase winding W4 and through the outer peripheral line Lo so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W4b of the 4th W-phase coil | winding W4 is protruded to the rear side of the cyclic | annular base part 38a through the drawer | drawer termination | terminus through-hole H12b.

  Next, the lead-out start end through hole H12a is formed at a position corresponding to the fourth W-phase winding W4 and through the inner circumferential line Li so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W4a of the 4th W-phase coil | winding W4 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H12a.

  As shown in FIG. 21, a plurality of arc-shaped bus bars B7 to B12 are arranged along the inner peripheral line Li and the outer peripheral line Lo on the rear side surface of the annular base portion 38a. Three seventh to ninth bus bars B7 to B9 are arranged on the inner circumferential line Li, and three tenth to twelfth bus bars B10 to B12 are arranged on the outer circumferential line Lo.

  The seventh bus bar B7 electrically connects the leading end portion U3b of the third U-phase winding U3 protruding from the leading end through hole H7b and the leading end portion U4a of the fourth U phase winding U4 protruding from the leading start end through hole H8a. It is a bus bar to be connected. At this time, 7th bus-bar B7 is arrange | positioned along inner peripheral line Li between drawer | drawer termination | terminus part U3b and drawer | drawing-out start part U4a, and electrically connects drawer | drawer termination | terminus part U3b and drawer | drawer start-end part U4a.

  The eighth bus bar B8 electrically connects the leading end portion V4b of the fourth V-phase winding V4 protruding from the leading end through hole H9b and the leading end portion V3a of the third V phase winding V3 protruding from the leading start end through hole H10a. It is a bus bar to be connected. At this time, the eighth bus bar B8 is disposed along the inner peripheral line Li between the drawer termination portion V4b and the drawer start end portion V3a, and electrically connects the drawer termination portion V4b and the drawer start end portion V4a.

  The ninth bus bar B9 electrically connects the leading end portion W3b of the third W-phase winding W3 protruding from the leading end through hole H11b and the leading end portion W4a of the fourth W phase winding W4 protruding from the leading start end through hole H12a. It is a bus bar to be connected. At this time, 9th bus-bar B9 is arrange | positioned along inner peripheral line Li between drawer | drawer termination | terminus part W3b and drawer | drawing-out start part W4a, and electrically connects drawer | drawer termination | terminus part W3b and drawer | drawing-out start part W4a.

  The tenth bus bar B10 electrically connects the leading end portion U4b of the fourth U-phase winding U4 protruding from the leading end through hole H8b and the leading end portion V4a of the fourth V phase winding V4 protruding from the leading start end through hole H9a. It is a bus bar to be connected. At this time, 10th bus-bar B10 is arrange | positioned along outer peripheral line Lo between the drawer | drawer termination | terminus part U4b and the drawer | drawing-out start part V4a, and is electrically connected with the drawer | drawer termination part U4b and the drawer | drawer start end part V4a.

  In the tenth bus bar B10, the leading end portion of the leading end portion U4b of the fourth U-phase winding U4 is cut at the connection portion with the tenth bus bar B10, whereas the leading end portion of the fourth V-phase winding V4 is pulled out. The tip of V4a is further drawn out from the connecting portion with the tenth bus bar B10 to the rear side in the rear axial direction. The leading end portion V4a of the fourth V-phase winding V4 with the tip portion pulled out to the rear side in the axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23 to be second driven. A second V-phase power supply voltage Vv2 is applied from the circuit 52.

  The eleventh bus bar B11 electrically connects the leading end portion V3b of the third V-phase winding V3 protruding from the leading end through hole H10b and the leading end portion W3a of the third W phase winding W3 protruding from the leading start end through hole H11a. It is a bus bar to be connected. At this time, the eleventh bus bar B11 is disposed along the outer peripheral line Lo between the drawer termination portion V3b and the drawer start end portion W3a, and is electrically connected between the drawer termination portion V3b and the drawer start end portion W3a.

  In the eleventh bus bar B11, the leading end V3b of the third V-phase winding V3 is cut at the connection portion with the eleventh bus bar B11, whereas the leading end of the third W-phase winding W3 is pulled out. W3a is further extended from the connecting portion with the eleventh bus bar B11 to the rear side in the rear axial direction. The leading end portion W3a of the third W-phase winding W3 with the leading end pulled out to the rear side in the axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23 to be second driven. The second W-phase power supply voltage Vw2 is applied from the circuit 52.

  The twelfth bus bar B12 electrically connects the leading end portion W4b of the fourth W-phase winding W4 protruding from the leading end through hole H12b and the leading end portion U3a of the third U phase winding U3 protruding from the leading start end through hole H7a. It is a bus bar to be connected. At this time, the twelfth bus bar B12 is disposed along the outer peripheral line Lo between the drawer termination portion W4b and the drawer start end U3a, and is electrically connected between the drawer termination portion W4b and the drawer start end U3a.

  In the twelfth bus bar B12, the leading end portion of the leading end portion W4b of the fourth W-phase winding W4 is cut at the connecting portion with the twelfth bus bar B12, whereas the leading end portion of the third U-phase winding U3 is pulled out. U3a is further extended from the connecting portion with the twelfth bus bar B12 to the rear side in the rear axial direction. The leading end portion U3a of the third U-phase winding U3 with the tip portion pulled out to the rear side in the axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, so that the second drive A second U-phase power supply voltage Vu2 is applied from the circuit 52.

As a result, the second system three-phase winding S2 has a winding structure of delta connection as shown in FIG.
As described above in detail, also in this embodiment, in addition to the same operations and effects as in the first embodiment, when one of them becomes inoperative, the torque ripple of the brushless motor M can be reduced. Has an effect.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in the arrangement structure of the first system three-phase winding S1 and the second system three-phase winding S2. Therefore, the characteristic part will be described in detail, and the common part will be omitted for convenience of description.

  As shown in FIG. 25, in the first system three-phase winding S1, one tooth 31 is opened in the clockwise direction so that the first U-phase winding U1 → the first V-phase winding V1 → the first W-phase winding W1 → The teeth 31 are wound around the teeth 31 in the order of the second U-phase winding U2, the second V-phase winding V2, and the second W-phase winding W2. Accordingly, in-phase winding sets are arranged at 180 ° positions facing each other.

  On the other hand, in the second system three-phase winding S2, a third U-phase winding U3 is formed between the second W-phase winding W2 and the first U-phase winding U1, and the first U-phase winding U1 and the first V-phase winding S1. A third phase V phase winding V3 is formed between V1 and a third W phase winding W3 is formed between the first V phase winding V1 and the first W phase winding W1. Further, a fourth U-phase winding U4 is formed between the first W-phase winding W1 and the second U-phase winding U2, and a fourth V-phase winding V4 is provided between the second U-phase winding U2 and the second V-phase winding V2. And a fourth W-phase winding W4 is formed between the second V-phase winding V2 and the second W-phase winding W2. Accordingly, also in the second system three-phase winding S2, in-phase winding sets are arranged at 180 ° positions facing each other.

In the present embodiment, an annular bus bar holder 38 similar to that of the third embodiment is disposed on the rear side of the stator core 30.
Here, as shown in FIG. 26, on the side surface in the axial direction of the annular base portion 38a, the above-described intermediate line Lc is used as a reference, and the first inner peripheral line Li1 and the second inner peripheral line from the inner side are equally spaced radially inward. The line Li2 and the third inner peripheral line Li3 are assumed, and the first outer peripheral line Lo1, the second outer peripheral line Lo2, and the third outer peripheral line Lo3 are assumed from the inner side at equal intervals outward in the radial direction.

  A through hole for the first system three-phase winding S1 is formed on the intermediate line Lc and the first to third inner peripheral lines Li1 to Li3, and the intermediate line Lc and the first to third outer peripheral lines Lo1. A through hole for the second system three-phase winding S2 is formed on ~ Lo3.

  The through hole for the first system three-phase winding S1 is in the clockwise direction in FIG. 26, the drawing start end through hole H1a → the drawing end through hole H1b → the drawing end through hole H2b → the drawing start end through hole H2a → the drawing start end through. Hole H3a → Drawer terminal through hole H3b → Drawer terminal through hole H4b → Drawer start end through hole H4a → Drawer start end through hole H5a → Drawer terminal through hole H5b → Drawer terminal end through hole H6b → Drawer start end through hole H6a Is done.

  The lead-out starting end through hole H1a is formed at a position corresponding to the first U-phase winding U1 and through the first inner peripheral line Li1 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part U1a of the 1st U-phase coil | winding U1 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H1a.

  Next, the lead-out terminal through hole H1b is formed at a position corresponding to the first U-phase winding U1 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U1b of the 1st U-phase coil | winding U1 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination | terminus through-hole H1b.

  Next, the lead-out terminal through hole H2b is formed at a position corresponding to the first V-phase winding V1 and through the third inner peripheral line Li3 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V1b of the 1st V-phase coil | winding V1 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination | terminus through-hole H2b.

  Next, the drawing start end through hole H2a is formed at a position corresponding to the first V-phase winding V1 and through the third inner peripheral line Li3 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V1a of the 1st V-phase coil | winding V1 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H2a.

  Next, the lead-out start end through hole H3a is formed at a position corresponding to the first W-phase winding W1 and through the second inner peripheral line Li2 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W1a of the 1st W-phase coil | winding W1 is made to protrude in the rear side of the cyclic | annular base part 38a via the drawer | drawing-out start end through hole H3a.

  Next, the leading end through hole H3b is formed at a position corresponding to the first W-phase winding W1 and penetrating the second inner peripheral line Li2 perpendicular to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W1b of the 1st W-phase coil | winding W1 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination | terminus through-hole H3b.

  Next, the lead-out terminal through hole H4b is formed at a position corresponding to the second U-phase winding U2 and through the first inner peripheral line Li1 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U2b of the 2nd U-phase coil | winding U2 is made to protrude in the rear side of the annular base part 38a via the drawer | drawer termination | terminus through-hole H4b.

  Next, the drawing start end through hole H4a is formed at a position corresponding to the second U-phase winding U2 and through the second inner peripheral line Li2 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part U2a of the 2nd U-phase coil | winding U2 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H4a.

  Next, the lead-out start end through hole H5a is formed at a position corresponding to the second V-phase winding V2 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V2a of the 2nd V-phase coil | winding V2 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawing-out start end through-hole H5a.

  Next, the lead-out terminal through hole H5b is formed at a position corresponding to the second V-phase winding V2 and through the third inner peripheral line Li3 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V2b of the 2nd V-phase coil | winding V2 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination through-hole H5b.

  Next, the lead-out terminal through hole H6b is formed at a position corresponding to the second W-phase winding W2 and through the second inner peripheral line Li2 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W2b of the 2nd W-phase coil | winding W2 is protruded to the rear side of the annular base part 38a via the drawer | drawer termination | terminus through-hole H6b.

  Next, the drawing start end through hole H6a is formed at a position corresponding to the second W-phase winding W2 and through the third inner peripheral line Li3 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W2a of the 2nd W-phase coil | winding W2 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H6a.

  As shown in FIG. 27, on the rear side surface of the annular base portion 38a, the first bus bar B1 and the second inner side are disposed on the first inner peripheral line Li1 for the first system three-phase winding S1. The second and third bus bars B2 and B3 are arranged on the peripheral line Li2, the fourth and fifth bus bars B4 and B5 are arranged on the third inner peripheral line Li3, and the sixth bus bar B6 is arranged on the intermediate line Lc.

  The first bus bar B1 electrically connects the lead start end U1a of the first U-phase winding U1 protruding from the lead start end through hole H1a and the lead end portion U2b of the second U phase winding U2 protruding from the lead end through hole H4b. It is a bus bar to be connected. At this time, the first bus bar B1 is disposed along the first inner peripheral line Li1 between the drawing start end U1a and the drawing end U2b, and electrically connects the drawing start end U1a and the drawing end U2b. .

  The second bus bar B2 electrically connects the leading end portion W1b of the first W-phase winding W1 protruding from the leading end through hole H3b and the leading end portion U2a of the second U phase winding U2 protruding from the leading start end through hole H4a. It is a bus bar to be connected. At this time, 2nd bus-bar B2 is arrange | positioned along the 2nd inner peripheral line Li2 between the drawer | drawer termination | terminus part W1b and the drawer | drawing-out start part U2a, and electrically connects the drawer | drawer termination part W1b and the drawer | drawer start-end part U2a. .

  In the second bus bar B2, the leading end portion of the leading end portion W1b of the first W-phase winding W1 is cut at the connecting portion with the second bus bar B2, whereas the leading end portion of the second U-phase winding U2 is pulled out. U2a is further drawn from the connecting portion with the second bus bar 2 at the tip end portion toward the rear side in the rear axial direction. The leading end portion U2a of the second U-phase winding U2 with the leading end pulled out to the rear side in the axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, so that the first drive The first U-phase power supply voltage Vu1 is applied from the circuit 51.

  The third bus bar B3 electrically connects the leading end portion W2b of the second W-phase winding W2 protruding from the leading end through hole H6b and the leading end portion W1a of the first W phase winding W1 protruding from the leading start end through hole H3a. It is a bus bar to be connected. At this time, the third bus bar B3 is disposed along the second inner peripheral line Li2 between the drawing end portion W2b and the drawing start end portion W1a, and electrically connects the drawing end portion W2b and the drawing start end portion W1a. .

  The fourth bus bar B4 electrically connects the leading start end V1a of the first V-phase winding V1 protruding from the leading start end through hole H2a and the leading end portion V2b of the second V phase winding V2 protruding from the leading end through hole H5b. It is a bus bar to be connected. At this time, the fourth bus bar B4 is disposed along the third inner peripheral line Li3 between the drawing start end portion V1a and the drawing end portion V2b, and is electrically connected to the drawing start end portion V1a and the drawing end portion V2b. .

  The fifth bus bar B5 electrically connects the lead start end portion W2a of the second W-phase winding W2 protruding from the lead start end through hole H6a and the lead end portion V1b of the first V phase winding V1 protruding from the lead end through hole H2b. It is a bus bar to be connected. At this time, the fifth bus bar B5 is disposed along the third inner peripheral line Li3 between the drawing start end portion W2a and the drawing end portion V1b, and is electrically connected to the drawing start end portion W2a and the drawing end portion V1b. .

  In the fifth bus bar B5, the leading end V1b of the first V-phase winding V1 is cut at the connecting portion with the fifth bus bar B5, whereas the leading end of the second W-phase winding W2 is cut off. W2a is further extended from the connecting portion with the fifth bus bar 5 to the rear side in the rear axial direction. The leading end portion W2a of the second W-phase winding W2 with the tip portion pulled out to the rear side in the rear axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23, so that the first drive The first W-phase power supply voltage Vw1 is applied from the circuit 51.

  The sixth bus bar B6 electrically connects the lead start end V2a of the second V-phase winding V2 protruding from the lead start end through hole H5a and the lead end U1b of the first U phase winding U1 protruding from the lead end through hole H1b. It is a bus bar to be connected. At this time, the sixth bus bar B6 is disposed between the drawing start end V2a and the drawing end U1b along the intermediate line Lc, and is electrically connected between the drawing start end V2a and the drawing end U1b.

  In the sixth bus bar B6, the leading end portion of the leading end portion U1b of the first U-phase winding U1 is cut at the connecting portion with the sixth bus bar B6, whereas the leading end portion of the second V-phase winding V2 is pulled out. V2a is further drawn from the connecting portion with the sixth bus bar B6 to the rear side in the rear axial direction rear side. The leading end portion V2a of the second V-phase winding V2 with the tip portion pulled out to the rear side in the rear axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23 for the first drive. The first V-phase power supply voltage Vv1 is applied from the circuit 51.

As a result, the first system three-phase winding S1 has a delta-connected winding structure as shown in FIG.
The through hole for the second system three-phase winding S2 is in the clockwise direction in FIG. 26, the drawing start end through hole H7a → the drawing end through hole H7b → the drawing end through hole H8b → the drawing start end through hole H8a → the drawing start end through. Hole H9a → Drawing end through hole H9b → Drawing end through hole H10b → Drawing start end through hole H10a → Drawing start end through hole H11a → Drawing end through hole H11b → Drawing end through hole H12b → Drawing start end through hole H12a. The

  The lead-out starting end through hole H7a is formed at a position corresponding to the fourth U-phase winding U4 and through the intermediate line Lc so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start-end part U4a of the 4th U-phase coil | winding U4 is protruded to the rear side of the annular base part 38a via the drawer | draw-out start end through-hole H7a.

  Next, the lead-out terminal through hole H7b is formed at a position corresponding to the fourth U-phase winding U4 and through the first outer peripheral line Lo1 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U4b of the 4th U-phase coil | winding U4 is made to project to the rear side of the annular base part 38a via the drawer | drawer termination | terminus through-hole H7b.

  Next, the lead-out terminal through hole H8b is formed at a position corresponding to the fourth V-phase winding V4 and through the third outer peripheral line Lo3 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V4b of the 4th V-phase coil | winding V4 is protruded to the rear side of the annular base part 38a via the drawer | drawer termination through-hole H8b.

  Next, the lead-out start end through hole H8a is formed at a position corresponding to the fourth V-phase winding V4 and through the first outer peripheral line Lo1 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part V4a of the 4th V-phase coil | winding V4 is protruded to the rear side of the cyclic | annular base part 38a through the drawing start end through-hole H8a.

  Next, the lead-out start end through hole H9a is formed at a position corresponding to the fourth W-phase winding W4 and through the third outer peripheral line Lo3 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W4a of the 4th W-phase coil | winding W4 is protruded to the rear side of the cyclic | annular base part 38a through the drawing start-end through-hole H9a.

  Next, the lead-out terminal through hole H9b is formed at a position corresponding to the fourth W-phase winding W4 and through the second outer peripheral line Lo2 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part W4b of the 4th W-phase coil | winding W4 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination | terminus through-hole H9b.

  Next, the lead-out terminal through hole H10b is formed so as to penetrate the first outer peripheral line Lo1 at a position corresponding to the third U-phase winding U3 and perpendicular to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part U3b of the 3rd U-phase coil | winding U3 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination | terminus through-hole H10b.

  Next, the lead-out start end through hole H10a is formed at a position corresponding to the third U-phase winding U3 and through the first outer peripheral line Lo1 so as to be orthogonal to the axial direction. And the front-end | tip part of the extraction | drawer start end part U3a of the 3rd U-phase coil | winding U3 is made to protrude in the rear side of the annular base part 38a via the extraction | drawer start end through-hole H10a.

  Next, the lead-out starting end through hole H11a is formed at a position corresponding to the third V-phase winding V3 and through the third outer peripheral line Lo3 so as to be orthogonal to the axial direction. And the front-end | tip part of the extraction | drawer start end part V3a of the 3rd V-phase coil | winding V3 is made to project to the rear side of the annular base part 38a via the extraction start end through-hole H11a.

  Next, the lead-out terminal through hole H11b is formed at a position corresponding to the third V-phase winding V3 and through the second outer peripheral line Lo2 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawer termination | terminus part V3b of the 3rd V-phase coil | winding V3 is protruded to the rear side of the cyclic | annular base part 38a via the drawer | drawer termination through-hole H11b.

  Next, the lead-out terminal through hole H12b is formed at a position corresponding to the third W-phase winding W3 and through the intermediate line Lc so as to be orthogonal to the axial direction. Then, the leading end portion of the leading end portion W3b of the third W-phase winding W3 is projected to the rear side of the annular base portion 38a through the leading end through hole H12b.

  Next, the lead-out start end through hole H12a is formed at a position corresponding to the third W-phase winding W3 and through the second outer peripheral line Lo2 so as to be orthogonal to the axial direction. And the front-end | tip part of the drawer | drawing-out start end part W3a of the 3rd W-phase coil | winding W3 is protruded to the rear side of the annular base part 38a via the drawer | drawing-out start end through-hole H12a.

  As shown in FIG. 27, on the rear side surface of the annular base portion 38a, on the intermediate line Lc, on the seventh bus bar B7 and on the first outer peripheral line Lo1 for the second system three-phase winding S2. The eighth and ninth bus bars B8, B9, the tenth bus bar B10 on the second outer peripheral line Lo2, the eleventh bus bar B11 on the third outer peripheral line Lo3, the twelfth crossing the third outer peripheral line Lo3 and the second outer peripheral line Lo2. Bus bar B12 is arranged.

  The seventh bus bar B7 electrically connects the leading end portion W3b of the third W-phase winding W3 protruding from the leading end through hole H12b and the leading end portion U4a of the fourth U phase winding U4 protruding from the leading start end through hole H7a. It is a bus bar to be connected. At this time, the seventh bus bar B7 is disposed along the intermediate line Lc between the drawing end portion W3b and the drawing start end portion U4a, and electrically connects the drawing end portion W3b and the drawing start end portion U4a.

  In the seventh bus bar B7, the leading end of the third W-phase winding W3 is cut at the connecting portion with the seventh bus bar B7, whereas the leading end of the fourth U-phase winding U4 is pulled out. The portion U4a is further pulled out from the connecting portion with the eighth bus bar B8 to the rear side in the rear axial direction. The leading end portion U4a of the fourth U-phase winding U4 with the leading end pulled out to the rear side in the axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23 to be second driven. A second U-phase power supply voltage Vu2 is applied from the circuit 52.

  The eighth bus bar B8 electrically connects the lead start end V4a of the fourth V-phase winding V4 protruding from the lead start end through hole H8a and the lead end portion U3b of the third U phase winding U3 protruding from the lead end through hole H10b. It is a bus bar to be connected. At this time, the eighth bus bar B8 is disposed along the first outer peripheral line Lo1 between the drawing start end portion V4a and the drawing end portion U3b, and electrically connects the drawing start end portion V4a and the drawing end portion U3b.

  In the eighth bus bar B8, the leading end of the third U-phase winding U3 is cut off at the connecting portion with the eighth bus bar B8, whereas the leading end of the fourth V-phase winding V4 is pulled out. The portion V4a is further extended from the connecting portion with the eighth bus bar B8 to the rear side axial direction rear side. The leading end portion V4a of the fourth V-phase winding V4 with the tip portion pulled out to the rear side in the axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23 to be second driven. A second V-phase power supply voltage Vv2 is applied from the circuit 52.

  The ninth bus bar B9 electrically connects the lead start end U3a of the third U-phase winding U3 protruding from the lead start end through hole H10a and the lead end portion U4b of the fourth U phase winding U4 protruding from the lead end through hole H7b. It is a bus bar to be connected. At this time, 9th bus-bar B9 is arrange | positioned along the 1st outer peripheral line Lo1 between the drawer | drawing-out start end part U3a and the drawer | drawer termination | terminus part U4b, and electrically connects the drawer | draw-out start end part U3a and the drawer | drawer termination | terminus part U4b.

  The tenth bus bar B10 electrically connects the lead start end W3a of the third W-phase winding W3 protruding from the lead start end through hole H12a and the lead end portion W4b of the fourth W phase winding W4 protruding from the lead end through hole H9b. It is a bus bar to be connected. At this time, the tenth bus bar B10 is disposed along the second outer peripheral line Lo2 between the drawing start end W3a and the drawing end W4b, and electrically connects the drawing start end W3a and the drawing end W4b.

  The eleventh bus bar B11 electrically connects the lead start end V3a of the third V-phase winding V3 protruding from the lead start end through hole H11a and the lead end portion V4b of the fourth V phase winding V4 protruding from the lead end through hole H8b. It is a bus bar to be connected. At this time, the eleventh bus bar B11 is disposed along the third outer peripheral line Lo3 between the drawing start end V3a and the drawing end V4b, and electrically connects the drawing start end V3a and the drawing end V4b.

  The twelfth bus bar B12 electrically connects the lead start end portion W4a of the fourth W-phase winding W4 protruding from the lead start end through hole H9a and the lead end portion V3b of the third V phase winding V3 protruding from the lead end through hole H11b. It is a bus bar to be connected. At this time, the twelfth bus bar B12 is disposed across the third outer peripheral line Lo3 and the second outer peripheral line Lo2 between the extraction start end part W4a and the extraction end part V3b, and between the extraction start end part W4a and the extraction end part V3b. Connect electrically.

  In the twelfth bus bar B12, the leading end V3b of the third V-phase winding V3 is cut at the connecting portion with the twelfth bus bar B12, whereas the leading end of the fourth W-phase winding W4 is pulled out. The leading end of W4a is further drawn out from the connecting portion with the twelfth bus bar B12 toward the rear side in the rear axial direction. The leading end portion W4a of the fourth W-phase winding W4 with the tip portion pulled out to the rear side in the rear axial direction passes through the through hole 21b formed in the rear cover wall 21a and is led out to the housing box 23 for the second drive. The second W-phase power supply voltage Vw2 is applied from the circuit 52.

As a result, the second system three-phase winding S2 has a delta-connected winding structure as shown in FIG.
As described above in detail, also in this embodiment, in addition to the same operations and effects as in the first embodiment, when one of them becomes inoperative, the torque ripple of the brushless motor M can be further reduced. It has an effect that can be done.

The above embodiment may be modified as follows.
In the first and second embodiments, the semicircular arc-shaped first and second bus bar holders 35 and 36 are used, but instead of the annular bus bar holder 38 used in the third and fourth embodiments, Also good.

In the first embodiment, the bus bars B <b> 1 to B <b> 12 are round conductors with insulation coating, but may be implemented with plate conductors with insulation coating.
In the first embodiment, the drawer start end portions U1a to U4a, V1a to V4a, and W1a to W4a are extended as they are and connected to the corresponding output terminals Tu1, Tv1, Tw1, Tu2, Tv2, and Tw2. It may be implemented by connecting with another part such as a terminal extending from the terminal.

-In the said 3rd and 4th embodiment, although it was a delta connection structure, you may change and implement this to a star connection structure.
In the first embodiment, the delta connection structure or the star connection structure is used. However, the delta connection structure and the star connection structure may be used.

  Specifically, one of the three-phase windings is wired as in the upper half of FIG. 5 using the first bus bar holder 35 of FIG. 6 as the delta connection of FIG. 8 which is the upper half of FIG. The second bus bar holder 36 of FIG. 14 is used as the star connection of FIG. 16 which is the lower half of FIG. 11, and the lines are wired as in the lower half of FIG.

Needless to say, the present invention is also applicable to three or more three-phase winding sets in which both delta connection and star connection are provided.
In each of the above embodiments, the rotor 26 is implemented with 14 poles, but is not limited thereto, and may be implemented with 10 poles, for example.

  In each of the above embodiments, the rotor 26 is implemented with an IPM type rotor, but is not limited to this, and may be implemented with, for example, an SPM type rotor or a continuous pole type rotor.

  The brushless motor M of each of the embodiments described above is embodied in the column assist type electric power steering apparatus 1, but may be applied to a rack assist type or pinion assist type electric power steering apparatus.

  The brushless motor M of each of the above embodiments is embodied in the electric power steering apparatus 1, but may be embodied in a motor used for a wiper apparatus, a power window apparatus, a valve timing adjustment apparatus, or the like.

  DESCRIPTION OF SYMBOLS 1 ... Electric power steering device, 2 ... Steering wheel, 3 ... Steering shaft, 3a ... Input shaft, 3b ... Output shaft, 4 ... Universal joint, 5 ... Intermediate, 7 ... Rack, 8 ... Pinion shaft, 9 ... Tie rod, DESCRIPTION OF SYMBOLS 10 ... Steering wheel, 11 ... Steering column, 20 ... Motor case, 21 ... Motor housing, 21a ... Rear cover wall, 21b ... Through hole, 22 ... Front cover, 23 ... Storage box, 24 ... Stator, 25 ... Rotating shaft, 26 ... rotor, 27, 28 ... bearing, 30 ... stator core, 31 ... teeth, 32 ... slot, 35 ... first bus bar holder, 35a ... first base part, 35b ... outer peripheral wall part, 35c ... inner peripheral wall part, 35d ... accommodating Space (accommodating portion), 36 ... second bus bar holder, 36a ... second base portion, 36b ... outer peripheral wall portion, 36c ... inside Wall part, 36d ... accommodating space (accommodating part), 38 ... annular bus bar holder, 38a ... annular base part, 38b ... outer peripheral wall part, 38c ... inner peripheral wall part, 38d ... accommodating space (accommodating part), 40 ... rotor core, 41 ... 1st permanent magnet, 42 ... 2nd permanent magnet, 50 ... Circuit board, 51 ... 1st drive circuit, 52 ... 2nd drive circuit, 53 ... 1st drive control circuit, 54 ... 2nd drive control circuit, 55 ... ECU (Electronic Control Unit), 56: Rotation sensor, 57: Detection magnet, M: Three-phase brushless motor, B1 to B12: First to twelfth busbar, S1: First system, three-phase winding (three-phase winding) Set), S2 ... second system three-phase winding (three-phase winding set), U1 ... first U-phase winding (reverse winding), U2 ... second U-phase winding (forward winding), U3 ... third U-phase winding (Normal winding), U4 ... 4th U-phase winding (reverse winding), V1 ... 1st V-phase winding (forward) ), V2 ... 2nd V-phase winding (reverse winding), V3 ... 3rd V-phase winding (reverse winding), V4 ... 4th V-phase winding (forward winding), W1 ... 1st W-phase winding (reverse winding), W2 ... Second W-phase winding (forward winding), W3 ... Third W-phase winding (forward winding), W4 ... Fourth W-phase winding (reverse winding), U1a to U4a, V1a to V4a, W1a to W4a ... Drawout start end, U1b ˜U4b, V1b to V4b, W1b to W4b... Drawer end, H1a to H12a... Drawer start end through hole, H1b to H12b... Drawer end through hole, Tu1. Tw1 ... W phase first output terminal, Tu2 ... U phase second output terminal, Tv2 ... V phase second output terminal, Tw2 ... W phase second output terminal, Vu1, Vu2 ... first and second U phase power supply voltages, Vv1, Vv2... First and second V-phase power supply voltages, Vw1, Vw2. And second W-phase power supply voltage, N1 to N6, connection points, Q1 to Q12, switching elements, L1, central axis, Lc, intermediate line, Lo, outer peripheral line, Lo1, first outer peripheral line, Lo2, second outer peripheral line, Lo3 ... third outer circumference line, Li ... inner circumference line, Li1 ... first inner circumference line, Li2 ... second inner circumference line, Li3 ... third inner circumference line, SG1-SG12 ... drive signal.

Claims (19)

A plurality of three-phase winding sets are wound around the teeth of the stator core, and a plurality of three-phase winding sets are connected to each of the three-phase winding sets for each three-phase winding set on one side in the axial direction. And a stator having a bus bar holder for supporting the plurality of bus bars,
A plurality of bus bars provided for each of the three-phase winding sets are arcuate and are spaced apart from each other. The stator according to claim 1,
Each of the arc-shaped bus bars has a concentric arc shape centering on a central axis of the stator. The stator according to claim 1 or 2,
The arc-shaped bus bars are spaced apart from each other in the radial direction. The stator according to any one of claims 1 to 3,
Each of the arc-shaped bus bars connects, at one side in the axial direction, a drawing start end portion and a drawing end portion drawn from one side in the axial direction of each winding. In the stator according to any one of claims 1 to 4,
A bus bar holder that supports the bus bar is formed in an annular shape, and a stator that accommodates coil ends protruding from the stator core of the windings is formed on the plurality of three-phase winding sets. . The stator according to claim 5, wherein
The annular bus bar holder is formed of an arcuate bus bar holder formed so as to be divided by the number of the three-phase winding sets. In the stator according to any one of claims 1 to 6,
The winding of each phase provided for each of the plurality of three-phase winding sets is formed by a winding pair including a concentrated winding of the normal winding with respect to the teeth and a concentrated winding of the reverse winding with respect to the teeth. A stator characterized by that. The stator according to claim 7,
The stator is characterized in that a pair of windings composed of the concentrated concentrated winding of the normal winding and the concentrated winding of the reverse winding of each phase are formed on adjacent teeth. The stator according to claim 7 or 8,
The winding pairs composed of the concentrated concentrated windings of the normal winding and the reverse winding of each phase are formed on adjacent teeth, and the winding pairs are arranged in parallel for the same three-phase winding set. A stator characterized by The stator according to claim 7 or 8,
The winding pairs composed of the concentrated concentrated windings of the normal winding and the reverse winding of the respective phases are formed in adjacent teeth, and the winding pairs are wound in the other phases of the same three-phase winding set. The stator is arranged at intervals of 120 ° in the circumferential direction with respect to the line pair. The stator according to claim 7,
The stator is characterized in that the winding pairs composed of the concentrated concentrated winding of the normal winding and the concentrated winding of the reverse winding of each phase are arranged at an interval of 180 ° in the circumferential direction with respect to one winding. In the stator according to any one of claims 1 to 11,
The stator having two sets of the plurality of three-phase winding sets. In the stator according to any one of claims 1 to 12,
The stator, wherein each of the plurality of three-phase winding groups is a delta connection. In the stator according to any one of claims 1 to 12,
Each of the plurality of three-phase winding sets is a star connection. In the stator according to any one of claims 1 to 12,
The stator, wherein the plurality of three-phase winding sets are a delta connection and a star connection.   The motor provided with the stator as described in any one of Claims 1-15. The motor according to claim 16, wherein
Each of the plurality of three-phase winding sets is driven by an individual drive circuit. The motor according to claim 16 or 17,
The stator includes 12 concentrated windings on 12 teeth, and the rotor disposed inside the stator has either 10 poles or 14 poles. The motor according to any one of claims 16 to 18, wherein
The motor is a motor used in an electric power steering apparatus.