JP5481351B2 - Abduction type electric motor - Google Patents

Description

  The present invention relates to an abduction type electric motor, and more particularly to an abduction type electric motor that can be mounted on a hybrid vehicle or an electric vehicle.

  As a stator used in a conventional abduction type electric motor, a claw standing on the outer side in the laminating direction of the steel sheet from the vicinity of the slot between adjacent teeth is formed on the outermost steel sheet, and a connecting wire is formed on the outer periphery of the claw. It is known that the crossover wire is moved to the inner diameter side of the stator and prevented from entering the mounting seat surface of the stator to improve the assemblability (for example, see Patent Document 1). .

  However, in the stator described in Patent Document 1, since the winding is wound around the tooth having the circumferential protrusion formed on the outer peripheral portion, the electrical insulation between the tooth and the winding is not sufficient. Therefore, it is conceivable to use a stator in which a resin insulator around which a winding is wound is inserted into the teeth of the stator core having no circumferential protrusion from the outside in the radial direction of the stator core.

JP 2002-315250 A

  However, in a stator using an insulator, the insulator tends to be pushed outward in the radial direction of the stator by the springback of the connecting portion connecting the coils of the same phase, and there is a possibility that the insulator and the rotor come into contact with each other. It was.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to prevent the insulator from coming out of the stator teeth, and to reliably prevent contact between the insulator and the rotor. It is to provide an electric motor.

In order to achieve the above-mentioned object, the invention according to claim 1
A stator core (for example, a stator core 11 in an embodiment described later) having a plurality of teeth (for example, teeth 11b in an embodiment described later) that are arranged at predetermined intervals in the circumferential direction and project radially outward, and a radially outer side Are formed by winding a plurality of insulators (for example, an insulator 12 in an embodiment to be described later) and windings (for example, a winding 14 in an embodiment to be described later) around the insulator. A plurality of coils (for example, a coil 13 in an embodiment described later), and an electric motor stator (for example, a stator 10 in an embodiment described later),
An annular motor rotor (for example, a rotor 6 in an embodiment described later) disposed on the radially outer side of the motor stator;
A resolver stator (for example, a resolver stator 91 in an embodiment to be described later) attached to the stator core via a resolver stator holder (for example, a resolver stator holder 95 in an embodiment to be described later), and the resolver stator to face the resolver stator. A resolver (for example, described later) having a resolver rotor (for example, a resolver rotor 92 in an embodiment to be described later) attached to a motor rotor or a support member (for example, a rotating shaft 8 in an embodiment to be described later) that supports the motor rotor. An abduction type electric motor (for example, an abduction type electric motor 1 in an embodiment to be described later),
The insulator is provided with an engaged portion (for example, an engaged portion 61 in an embodiment described later),
The resolver stator holder is provided with an engaging portion (for example, an engaging portion 95c in an embodiment described later) that engages with the engaged portion of the insulator.

In addition to the configuration of claim 1, the invention according to claim 2
The insulator includes a trunk portion (for example, a trunk portion 24 in an embodiment described later) around which the winding is wound, and an inner peripheral side flange portion (for example, an embodiment described later) provided on the radially inner side of the trunk portion. And 26)
The engaged portion includes first and second engaged portions that extend radially inward from both circumferential end portions on one axial side of the inner flange portion of the insulator (for example, an embodiment described later). In the first and second engaged portions 61A, 61B),
The first and second engaged portions include a base portion extending radially inward (for example, a base portion 62 in an embodiment described later), and a convex portion protruding from the other axial side surface of the base portion to the other axial side. (For example, a convex portion 63 in the embodiment described later),
The engaging portion is composed of a plurality of restraining portions (for example, restraining portions 96 in the embodiments described later) extending from the radially outer surface of the resolver stator holder to the radially outer side at predetermined intervals in the circumferential direction.
The holding portion is substantially T-shaped when viewed from the axial direction, and is engaged so as to straddle one of the first engaged portions and the other second engaged portion of the adjacent insulators. It is characterized by combining.

In addition to the configuration of claim 1 or 2, the invention according to claim 3
The resolver stator holder is fastened together with a fastening member (for example, a bolt 3 in an embodiment described later) to a case member (for example, a motor housing 2 in an embodiment described later) that holds the motor stator together with the stator core. It is characterized by.

  According to the first aspect of the present invention, since the engaging portion of the resolver stator holder engages with the engaged portion of the insulator, the insulator is prevented from coming out of the stator teeth, and contact between the insulator and the rotor is prevented. It can be surely prevented.

  According to the invention of claim 2, the restraining portion of the engaging portion is engaged so as to straddle one first engaged portion and the other second engaged portion in a pair of adjacent insulators. In addition, since the pair of insulators can be fixed by one holding portion, the insulator can be prevented from rattling, and the insulator can be more reliably prevented from coming out radially outward from the teeth.

  According to the invention of claim 3, the resolver stator is held by the resolver stator holder, and the resolver stator holder is fastened together with the fastening member to the case member holding the motor stator together with the stator core, so that the resolver stator holder functions as a washer. Then, the insulating coating on the surface of the stator core is suppressed from being damaged by the seating surface of the fastening member. Thereby, the dispersion | variation in axial force can be suppressed. Moreover, the fastening member for attaching the resolver and the screw hole of the case member can be omitted, and the manufacturing cost can be reduced and the weight can be reduced. Furthermore, the insulator can be firmly fixed by the teeth of the stator core.

It is a longitudinal cross-sectional view of the electric motor of this invention. It is a front view of the stator in FIG. It is a rear view of the stator in FIG. It is a principal part perspective view which fractures | ruptures and shows the stator in FIG. It is a front view of a stator core. (A) is a perspective view of the insulator seen from one axial direction side, (b) is a perspective view of the insulator seen from the other axial direction side. (A) is a perspective view of the 1st coil by which the coil | winding was wound by the insulator, (b) is a perspective view of the 2nd coil by which the coil | winding was wound by the insulator. It is an expansion perspective view which shows the junction part of a coil winding. It is a principal part perspective view which fractures | ruptures and shows the stator of a modification partially.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  FIG. 1 is a longitudinal sectional view of an electric motor according to the present invention. As shown in FIG. 1, the electric motor of the present embodiment is a three-phase, eight-pole pair abduction type electric motor 1, and a stator 10 fixed around a shaft center O to a motor housing 2 by a bolt 3; And an annular rotor 6 disposed on the radially outer side of the stator 10 via a slight gap.

  The rotor 6 has a substantially annular shape in which a magnet 6b is embedded in a rotor core 6a formed by laminating electromagnetic steel plates. The rotor 6 is fixed to the edge inner peripheral surface 5a of the edged disk-shaped arm member 5, and can rotate integrally with a rotating shaft 8 rotatably supported by ball bearings 7 and 7 fitted in the motor housing 2. It is fixed to. The rotor 6 is driven to rotate by a rotating magnetic field generated in the stator 10. A resolver 9 that detects the magnetic pole position of the rotating shaft 8 is disposed between the rotating shaft 8 and the stator 10.

  As shown in FIGS. 2 to 5, the stator 10 includes a stator core 11, a plurality of insulators 12, and a plurality (24 in the present embodiment) of coils 13 (13 u, 13 v, 13 w).

  The stator core 11 is formed by laminating a plurality of electromagnetic steel plates in the axial direction of the stator 10, that is, in a direction perpendicular to the paper surface in FIG. 5, and is formed so as to protrude radially outward from the annular portion 11a in the circumferential direction. A plurality of (24) teeth 11b arranged in a row, and has a substantially annular shape as a whole. A plurality (six in this embodiment) of convex portions 11c each having a bolt hole 17 are formed on the inner peripheral side of the annular portion 11a of the stator core 11. The stator 10 is fixed to the motor housing 2 by the bolt 3 inserted through the bolt hole 17 (see FIG. 1).

  The coil 13 is a winding made of a predetermined number of conducting wires (in this embodiment, a bundled wire (para-winding) made up of two conducting wires, hereinafter referred to as a bundled wire) 14 and a synthetic resin having insulating properties. It is formed by winding around each tooth 11b of the stator core 11 by salient pole concentrated winding via an insulator 12 formed by the above method.

  Each of the coils 13 includes eight U-phase, V-phase, and W-phase three-phase coils, and the U-phase coil 13u, the V-phase coil 13v, and the W-phase coil 13w are arranged in this order in the clockwise direction. It is wound around the teeth 11b. That is, the in-phase coils 13 (for example, the U-phase coil 13 u) disposed across the other-phase coils 13 (for example, the V-phase coil 13 v and the W-phase coil 13 w) straddle the other-phase coils 13. It is connected by the crossing part 14T routed.

  The insulator 12 is attached to the teeth 11b of the stator core 11 from the outside in the radial direction. As shown in FIG. 6, the insulator 12 is provided at the body portion 24 around which the bundle wire 14 is wound, and at both ends in the radial direction of the body portion 24. The outer peripheral side flange part 25 and the inner peripheral side flange part 26 are provided. The body portion 24 has a rectangular hole 24a penetrating in the radial direction by the walls 20 and 21 facing in the axial direction of the stator 10 and the walls 22 and 23 facing in the circumferential direction of the stator 10. It is formed in a cylindrical shape. The size of the square hole 24a is slightly larger than the teeth 11b of the stator core 11, and the teeth 11b can be inserted therethrough. A plurality of concave grooves 27 for positioning the bundle wire 14 when the bundle wire 14 is wound are provided in the walls 22 and 23 in a direction orthogonal to the axis of the square hole 24a.

  A pair of substantially U-shaped grooves 28 and 29 are formed at the end on the wall 20 side of the outer peripheral flange 25 so as to be spaced apart from each other in the circumferential direction. Further, the one axial side portion (the wall 20 side) of the inner circumferential flange 26 is viewed from the circumferential middle portion toward both circumferential end surfaces when viewed from the one axial side (left side in FIG. 6A). It is gradually formed thick.

  Inner winding support portions 31 and 32 having a substantially triangular prism shape protruding in one axial direction are provided at the corners between the circumferential end surfaces and the radially outer surface of the inner circumferential flange 26. Further, inclined surfaces 33, 34 that are inclined inward in the radial direction from the intermediate portion in the circumferential direction toward the both end surfaces in the circumferential direction are formed on one side portion in the axial direction of the inner peripheral flange portion 26. , 34 are opposed to the radially inwardly inclined surfaces 31a, 32a of the inner winding support portions 31, 32 to form groove portions 35, 36.

  Further, at the boundary portion between the axial side one side portion of the inner peripheral side flange portion 26 and the wall 20, the circumferential direction one end surface side (FIG. 6 (FIG. 6A)) from the circumferential other end surface side (right end surface in FIG. 6A). A guide part 37 inclined with respect to the wall 20 is formed, which guides the bundle 14 that is wound first along the wall 20 to the left end face in a). A step portion 37a for guiding the bundle wire 14 from the groove portion 35 toward the trunk portion 24 in the axial direction is formed.

  In addition, the first and second portions extending radially inward from both ends in the circumferential direction are formed at the boundary portion between the other axial side portion (the wall 21 side portion) of the inner peripheral side flange portion 26 and the square hole 24a. An engaged portion 61 composed of the engaged portions 61A and 61B is provided.

  The first and second engaged portions 61 </ b> A and 61 </ b> B include a substantially triangular prism-shaped base portion 62 that extends radially inward, and a substantially circular column that protrudes from the approximate center of the other axial side surface of the base portion 62 to the other axial direction side. And a convex portion 63 having a shape.

  The coil 13 is formed by winding the bundle wire 14 a plurality of times around the trunk portion 24 of the insulator 12. In the present embodiment, there are two types of coils 13 that are differently wound around the insulator 12. As shown in FIGS. 7 (a) and 7 (b), the coil 13 has a first winding end 41 of the coil 13 wound around the body 24 of the insulator 12 positioned on the outer side in the radial direction of the body 24. The second winding end 42 extends radially outward from the radially inner side of the body portion 24 across the coil 13 that is in a different phase. As shown in FIG. 7A, the first coil 13 has a first winding end 41 inserted into the groove 29 on the left side in the drawing, and its end 41a slightly extends radially outward from the outer peripheral side flange 25. The length is set so as to protrude. Further, the first coil 13 passes through the groove 35 obliquely downward to the right so that the second winding end 42 is axially aligned with the radially inwardly inclined surface 33 and is locked to the inner winding support 31. The As shown in FIG. 2, the tip of the inner winding support 31 extends outward in the radial direction, and the end 42a is a groove 29 in the end 41a of the first winding end 41 of the in-phase coil 13 adjacent in the circumferential direction. Therefore, the length is set so that the end portion 42a slightly protrudes radially outward from the outer peripheral side flange portion 25 in addition to the crossing portion 14T straddling the coil 13 which is a different phase. The

  Further, as shown in FIG. 7B, the second coil 13 has a first winding end 41 inserted into the groove 28 on the right side in the figure, and its end 41a is radially outward from the outer peripheral side flange 25. The length is set so as to protrude slightly. Further, the second coil 13 extends the groove 36 obliquely to the lower left so that the second winding end 42 is wound around the inner winding support portion 32 and aligned in the axial direction with the radially inward inclined surface 34. . As shown in FIG. 2, the tip of the inner winding support 32 extends radially outward, and the end 42 a is a groove 29 in the end 41 a of the first winding end 41 of the in-phase coil 13 adjacent in the circumferential direction. Therefore, the length is set so that the end portion 42a slightly protrudes radially outward from the outer peripheral side flange portion 25 in addition to the crossing portion 14T straddling the coil 13 which is a different phase. The

  Returning to FIG. 2, the eight coils 13 (U-phase, V-phase and W-phase coils 13 u, 13 v, 13 w) for each phase are divided into two coil groups 18 (four corresponding to the half circumference of the stator core 11). 18u, 18v, 18w). That is, the coil 13 of the coil group 18 (a coil group located on the left side of the boundary line P in FIG. 2) formed in the counterclockwise direction with respect to the stator 10 is composed of the first coil 13. On the other hand, the coil 13 of the coil group 18 (coil group positioned on the right side of the boundary line P in FIG. 2) formed clockwise is composed of the second coil 13.

  However, in the embodiment shown in FIG. 2, among the second coils 13 of the coil group 18 formed clockwise with respect to the stator 10, three coils 13 (13 u) connected to a neutral point to be described later. 13v, 13w), the first winding end 41 is inserted into the groove 29 and its end 41a is led upward to facilitate connection with the neutral point. Temporarily, these three coils 13 are called the 3rd coil 13. FIG. Note that all the coils 13 of the coil group 18 formed clockwise with respect to the stator 10 may be constituted by the second coils 13. In this case, the connection with the neutral point is slightly different.

  In FIG. 2, the bundled wire 14 derived from the pair of coils 13 having the same phase arranged closest to both sides of the boundary line P, specifically, the U-phase coil formed counterclockwise with respect to the stator 10. The end portions 42a of the second winding ends 42 of the first U-phase coil 13u of the group 18u and the second U-phase coil 13u of the U-phase coil group 18u formed clockwise with respect to the stator 10 are provided. , U-phase connection terminal 15u.

  Similarly, the end portions 42a of the second winding ends 42 of the pair of V-phase coils 13v arranged closest to both sides of the boundary line P are connected to the V-phase connection terminal 15v, and the first of the pair of W-phase coils 13w An end 42a of the second winding end 42 is connected to the W-phase connection terminal 15w.

  Further, the position where the coil group 18 formed in the counterclockwise direction and the coil group 18 formed in the clockwise direction meet, that is, the connection terminals 15 of each phase (U-phase, V-phase and W-phase connection terminals 15u, 15v). , 15w), the ends 41a of the first winding ends 41 of each phase pair and the six coils 13 arranged on both sides with the boundary line P interposed therebetween are the ends 41a of the adjacent coils 13. These are connected by connection lines 40 to form a neutral point.

  Further, the second winding end 42 of each first coil 13 of the coil group 18 formed around the left direction is inserted into the groove portion 36 of the adjacent coil 13 through the groove portion 35 of the insulator 12 and locked. The end portion 42a is joined to the end portion 41a of the first winding end 41 extending outward in the radial direction of the outer peripheral side flange portion 25 of the in-phase coil adjacent in the circumferential direction.

  Similarly, in the coil 13 of the coil group 18 formed in the clockwise direction, the second winding end 42 of each second coil 13 is inserted into the groove portion 35 of the adjacent coil 13 through the groove portion 36 of the insulator 12. Thus, the end 42a is joined to the end 41a of the first winding end 41 extending outward in the radial direction of the outer peripheral side flange 25 of the in-phase coil adjacent in the circumferential direction. Referring also to FIG. 8, the joint portion 14 a between the end portion 41 a of the first winding end 41 and the end portion 42 a of the second winding end 42 is covered with an insulating material 50 and fixed to the insulator 12. The joining process is performed by applying an ultrasonic wave or a high frequency by an ultrasonic welding apparatus, a high frequency welding apparatus (not shown) or the like, and the insulating process solidifies the powder varnish that is the insulating material 50 to join the joint portion 14a. Is fixed to the outer peripheral side flange 25 of the insulator 12.

  Here, the resolver 9 will be described with reference to FIGS.

  The resolver 9 includes a resolver stator 91 and a resolver rotor 92. The resolver stator 91 is held by a resolver stator holder 95 so as to protrude radially inward from the inner peripheral surface of the stator core 11, and the resolver rotor 92 is axially one side (in FIG. 1) from the base end portion 5b of the arm member 5. The resolver stator 91 and the resolver rotor 92 are arranged on the radially inner side of the stator core 11 so that the resolver stator 91 and the resolver rotor 92 are opposed to each other in the radial direction. . Further, the facing surfaces of the resolver stator 91 and the resolver rotor 92 are located within the facing surfaces of the rotor 6 and the stator 10 of the electric motor 1 in the axial direction. That is, the resolver 9 is located inside the stator core 11 in the radial direction and the axial direction. Reference numeral 93 in the figure denotes an output terminal of the resolver 9.

  The resolver stator holder 95 includes a side plate 95a having a substantially regular square shape having a substantially circular hole radially inward when viewed from the back surface (the other side in the axial direction), and an inner periphery of the stator core 11 from the inner periphery of the side plate 95a. An inner plate 95b extending in the axial direction to the substantially central portion toward the front surface (one side in the axial direction) along the peripheral surface is integrally formed. The side plate 95a may have a substantially annular shape.

  The side plate 95a includes an engaging portion 95c including 24 holding portions 96 extending radially outward from the outer peripheral surface at a predetermined interval in the circumferential direction, and the side plate 95a at a predetermined interval in the circumferential direction. Of the 24 vertices, a substantially semicircular fastening hole convex portion 95d protruding outward in the radial direction from six vertices is formed.

  Fastening holes 95e communicating with the bolt holes 17 formed in the stator core 11 are formed at the six apexes of the side plate 95a where the fastening hole convex portions 95d are provided, and the resolver stator that holds the resolver stator 91 is formed. The holder 95 is fastened to the motor housing 2 together with the stator core 11 by a plurality of bolts 3 that pass through the fastening holes 95e. A resolver stator 91 is attached to the inner peripheral surface of the inner plate 95b.

  The holding portion 96 is substantially T-shaped when viewed from the axial direction, and includes an extending portion 96a extending radially outward from a circumferential central portion of one side forming the outer peripheral surface of the side plate 95a, and an extending portion 96a. And a flange portion 96b extending from the radially outer end to both sides in the circumferential direction.

  The extending portion 96a is located between the base portion 62 of one first engaged portion 61A and the base portion 62 of the other second engaging portion 61B in the adjacent insulators 12, and contacts the both base portions 62. It touches. The flange portion 96b is engaged so as to straddle these adjacent first and second engaged portions 61A and 61B. More specifically, the engaged portion 61 is located on the radially inner side of the inner peripheral flange portion 26 of the adjacent insulator 12 and on the other axial side of the base portion 62 of the first and second engaged portions 61A, 61B. The protrusion 63 is engaged by coming into contact with the outer side in the radial direction.

  As described above, since the holding portion 96 is formed, the engaging portion 95 c of the resolver stator holder 95 is engaged with the engaged portion 61 of the insulator 12, so that the insulator 12 is connected to the teeth 11 b of the stator 10. It is possible to prevent the insulator 12 and the rotor 6 from coming into contact with each other by preventing them from slipping out radially outward.

  Further, the restraining portion 96 of the engaging portion 95c is engaged so that the flange portion 96b straddles one first engaged portion 61A and the other second engaged portion 61B in the adjacent insulator 12. Since the adjacent insulators 12 can be fixed by the single restraining portion 96, the insulators 12 can be prevented from rattling, and the insulators 12 can be more reliably prevented from coming out of the teeth 11b of the stator 10 radially outward.

  Further, since the resolver 9 is located on the inner side in the radial direction of the stator core 11, even if the rotor 6 falls down, for example, the distance from the axis O is short, so the amount of displacement can be reduced, and the detection accuracy of the resolver 9 can be reduced. Deterioration can be suppressed. Further, since the facing surfaces of the resolver stator 91 and the resolver rotor 92 are located in the facing surfaces of the stator 10 and the rotor 6 of the electric motor 1 in the axial direction, the axial distance of the electric motor 1 can be shortened and the motor housing 2 can be downsized. can do.

  Here, the resolver stator holder 95, which is fastened together with the stator core 11, functions as a washer with the side plate 95a sandwiched between the stator core 11 and the seating surface of the bolt 3. Therefore, when the resolver 9 is replaced or the like, when the bolt 3 is once removed and fastened again, the seat surface on the stator core 11 side is not roughened and a stable axial force can be obtained. Further, scratches and the like generated on the insulating coating of the stator core 11 are prevented, and deterioration of motor characteristics is prevented.

  Further, since the resolver stator holder 95 is fastened together with the stator housing 11 together with the motor housing 2, the insulator 12 is connected to the stator core 11 through the engagement of the engaged portion 61 and the engaging portion 95 c of the resolver stator holder 95. It becomes possible to fix to the teeth 11b more firmly.

  Further, since the stator core 11 is integrally formed with the annular portion 11a and the plurality of teeth 11b that are radially protruded from the annular portion 11a, the stator core 11 is not divided and formed. The leakage magnetic flux from 11 division parts does not generate | occur | produce. Therefore, loss can be reduced and motor performance is improved.

  As described above, according to the outer rotation type electric motor 1 of the present embodiment, the engaging portion 95 c of the resolver stator holder 95 is engaged with the engaged portion 61 of the insulator 12. It is possible to prevent the insulator 12 and the rotor 6 from coming into contact with each other by preventing the teeth 11b from coming out radially outward.

  In addition, the restraining portion 96 of the engaging portion 95c engages so that the flange portion 96b straddles one first engaged portion 61A and the other second engaged portion 61B in the adjacent insulator 12. Therefore, the insulators 12 adjacent to each other can be fixed by the single restraining portion 96, the rattling of the insulators 12 can be prevented, and the insulators 12 can be more reliably prevented from coming out radially outward from the teeth 11b of the stator 10.

  Further, the resolver stator 91 is held by a resolver stator holder 95, and the resolver stator holder 95 is fastened together with the stator core 11 and the motor housing 2 with bolts 3. Therefore, the resolver stator holder 95 functions as a washer and insulates the surface of the stator core 11. The coating is suppressed from being damaged by the bearing surface of the bolt 3. Thereby, the dispersion | variation in axial force can be suppressed. Further, the resolver mounting bolt and the screw hole of the motor housing 2 can be omitted, and the manufacturing cost can be reduced and the weight can be reduced. Further, the insulator 12 can be firmly fixed to the teeth 11 b of the stator core 11 through the engagement of the engaging portion 95 c of the resolver stator holder 95 and the engaged portion 61 of the insulator 12.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In the above description, the abduction type electric motor having the salient pole concentrated winding stator has been described. However, the present invention is not limited to this, and the abduction motor having the stator wound by other winding methods such as distributed winding. It can also be applied to a type motor.

  The resolver stator 91 may be directly attached to the motor housing 2 instead of being attached to the stator core 11, and the resolver rotor 92 may be directly attached to the rotor 6, such as the arm member 5, instead of being attached to the rotating shaft 8.

  Further, in the present embodiment, the engaging portion 95c of the resolver stator holder 95 is composed of a plurality of holding portions 96 having an extending portion 96a and a flange portion 96b, but the engaging portion 95c is connected to the insulator 12. As long as it engages with the provided engaged portion 61, it is not limited to this configuration.

  For example, as shown in FIG. 9, the engaging portion 95 c is provided on the outer peripheral surface of the side plate 95 a of the resolver stator holder 95, and has a substantially U-shaped cross section that opens toward the engaged portion 61 when viewed from the axis orthogonal direction. It is good also as a structure which engages with the to-be-engaged part 61 so that it may cover from the axial direction other side.

1 External rotation type motor 2 Motor housing (case member)
3 Bolt (fastening member)
6 Rotor (motor rotor)
8 Rotating shaft (support member)
9 Resolver 10 Stator (motor stator)
11 Stator core 11b Teeth 12 Insulator 13 Coil 14 Winding 24 Body 26 Inner peripheral side flange 61 Engaged part 61A First engaged part 61B Second engaged part 62 Base 63 Convex part 91 Resolver stator 92 Resolver rotor 95 Resolver stator holder 95c Engaging portion 96 Holding portion

Claims (3)

A stator core having a plurality of teeth arranged at predetermined intervals in the circumferential direction and projecting radially outward, a plurality of insulators mounted on the teeth from the radially outer side, and a winding wound around the outer periphery of the insulator An electric motor stator having a plurality of coils formed by
An annular motor rotor disposed radially outside the motor stator;
And a resolver stator attached to the stator core via a resolver stator holder, and a resolver rotor attached to the motor rotor or a support member supporting the motor rotor so as to face the resolver stator. An abduction motor,
The insulator is provided with an engaged portion,
An abduction motor, wherein the resolver stator holder is provided with an engaging portion that engages with the engaged portion of the insulator. The insulator includes a body portion around which the winding is wound, and an inner peripheral side flange portion provided on a radially inner side of the body portion,
The engaged portion is composed of first and second engaged portions extending radially inward from both circumferential ends on one axial side of the inner flange portion of the insulator,
The first and second engaged portions have a base portion extending radially inward, and a convex portion protruding from the other axial side surface of the base portion to the other axial direction side,
The engaging portion is composed of a plurality of holding portions extending radially outward at predetermined intervals in the circumferential direction from the radially outer surface of the resolver stator holder,
The holding portion is substantially T-shaped when viewed from the axial direction, and is engaged so as to straddle one of the first engaged portions and the other second engaged portion of the adjacent insulators. The abduction motor according to claim 1, wherein   3. The external rotation type electric motor according to claim 1, wherein the resolver stator holder is fastened together with a fastening member to a case member that holds the electric motor stator together with the stator core.

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