Insulator structure

Abstract

To provide an insulator structure capable of reducing a size of a coil end and securing alignment after an upper layer.SOLUTION: An insulator 38 includes: an outer peripheral piece 41; an inner peripheral piece 42 facing the outer peripheral piece 41 in a teeth axial direction Dt1; and a winding unit 43 that connects the outer peripheral piece 41 and the inner peripheral piece 42. A space surrounded by the outer peripheral piece 41, the inner peripheral piece 42, and the winding unit 43 is defined as a housing unit 45 of a winding 32. Projection units 46, 47 and an inner peripheral side recessed unit 49 are provided on one side in a motor axial direction Da of the inner peripheral piece 42. At ends on inner sides in a motor radial direction Dr of the projection units 46, 47, protrusion inclined surfaces 48 are provided inclined so as to be located at positions on outer sides in the motor axial direction Dr as moving toward the other sides in a motor peripheral direction Dc when viewed from the motor axial direction Da. On one side in the motor axial direction Da of the insulator 38, inclined groove units 52 are provided that are inclined so as to be along extended portions of the protrusion inclined surfaces 48 when viewed from the motor axial direction Da.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an insulator structure. [Background technology]

[0002] In recent years, efforts to realize a low-carbon or carbon-free society have become more active, and research and development into electrification technologies is being conducted in vehicles to reduce CO2 emissions and improve energy efficiency. For example, in rotating electrical machines such as vehicle drive motors, wound field motors are sometimes used instead of the mainstream interior permanent magnet type. Wound field motors place coils on the rotor instead of permanent magnets, and generate magnetic flux in the rotor by passing current through these coils. Wound field motors are expected to operate highly efficiently by making it possible to adjust the amount of magnetic flux in the rotor, and by not using permanent magnets, there are no concerns about the stable supply of rare earths.

[0003] That is, at least one of the stator and rotor of the motor has a circular ring-shaped portion, a plurality of cores (teeth) protruding radially inward or outward from the ring-shaped portion, and a coil with a conducting wire wound around the outer periphery of each core. For example, Patent Document 1 discloses a configuration in which a winding portion of an insulator around which a winding is wound has a guide groove that accommodates the winding start portion of the winding so as to guide it from the outside to the inside in the radial direction of the motor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-187073 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional technology, the thickness of the winding portion increases due to the presence of the guide groove, which increases the size of the coil end and may also deteriorate the alignment of the upper and subsequent layers.

[0006] Therefore, an object of the present invention is to provide an insulator structure that can reduce the size of the coil end and ensure alignment of the upper and subsequent layers, thereby contributing to improved energy efficiency. [Means for solving the problem]

[0007] As a means for solving the above problems, a first aspect of the present invention is a structure of an insulator attached to each of a plurality of teeth arranged in a circumferential direction of a motor, the insulator comprising: an outer peripheral piece provided on one end side of the tooth in a teeth axial direction along the motor radial direction; an inner peripheral piece provided on the other end side of the tooth in the teeth axial direction and facing the outer peripheral piece in the teeth axial direction; and a winding portion that covers the outer periphery of the tooth as seen in the teeth axial direction, connects the outer peripheral piece and the inner peripheral piece, and is wound with a winding; a space surrounded by a first opposing surface of the outer peripheral piece facing the inner peripheral piece, a second opposing surface of the inner peripheral piece facing the outer peripheral piece, and an outer surface of the winding portion serves as a storage portion for the winding; and one side of the inner peripheral piece in the motor axial direction is provided with a space surrounded by a first opposing surface of the outer peripheral piece facing the inner peripheral piece, a second opposing surface of the inner peripheral piece facing the outer peripheral piece, and an outer surface of the winding portion. and an inner peripheral recess portion disposed around the motor circumferential direction to avoid the protruding portion and recessed in the motor axial direction relative to the protruding portion, allowing the winding to be inserted from the inner radial direction of the inner peripheral piece to the inner radial direction of the motor. The inner radial end portion of the protruding portion has a protruding portion inclined surface that is positioned more outward in the motor radial direction as it moves from one circumferential side of the motor to the other, as viewed from the motor axial direction, and the extension portion to the other circumferential side of the motor intersects with the inner peripheral recess portion. The one axial side of the insulator has an inclined groove portion that is inclined to follow the extension portion of the protruding portion in the motor axial direction, allowing the winding to be inserted.

[0008] According to this configuration, a protrusion is formed on one side of the inner peripheral piece of the insulator in the axial direction of the motor as a portion for winding the conductors, and an inner peripheral recess is formed at a position avoiding the protrusion. An inclined protrusion surface is formed at the end of the protrusion on the outer side in the motor radial direction, inclined toward the outer side in the motor radial direction (toward the winding section). An inner peripheral recess through which the winding passes and an inclined groove into which the winding is inserted are formed along the extension of the inclined protrusion surface. When the winding is introduced from a transition region inside the inner peripheral piece in the motor radial direction toward the winding section, the winding is introduced along the inclined protrusion surface toward the winding section, so that the winding extends linearly, passes through the inner peripheral recess, and is inserted into the inclined groove. In this way, the winding start portion of the winding is stored in the inclined groove and the winding is guided from the inner peripheral piece side (inward in the motor radial direction) toward the winding section, thereby improving the workability of the winding. Furthermore, the inclination from the inside to the outside in the radial direction of the motor improves the adhesion of the winding to the winding portion, preventing the winding from protruding into the slot, ensuring alignment from the upper layer onwards, and reducing the size of the coil end.

[0009] A second aspect of the present invention is characterized in that, in the first aspect, the winding portion has a chamfered shape formed at a corner between an axial end face on one side of the motor axial direction and a circumferential end face on the other side of the motor circumferential direction in a cross section intersecting with the motor radial direction, and the one side of the insulator in the motor axial direction has a second inclined groove portion that is inclined to follow the chamfered shape in the cross section intersecting with the motor radial direction and is continuous with the inclined groove portion in an extension direction towards the other side of the motor circumferential direction as seen from the motor axial direction, allowing insertion of a winding. With this configuration, the winding can be inserted into the second inclined groove that communicates with the inclined groove in the extension direction, and the second inclined groove is inclined in cross section to follow the chamfered shape of the winding, so that when the winding is introduced from the transition area that is radially inward of the inner peripheral piece toward the winding, the winding smoothly merges into the corner in cross section. This suppresses bending and curvature at the winding start point and improves adhesion between the winding and the insulator, preventing the winding from protruding into the slot, ensuring alignment from the upper layer onwards, and enabling the physical size of the coil end to be reduced.

[0010] A third aspect of the present invention is characterized in that, in the above-mentioned second aspect, the protrusion, inclined groove and second inclined groove are arranged in pairs symmetrically with respect to the central axis of the tooth as the axis of symmetry when viewed from the motor axial direction. According to this configuration, the protrusion, inclined groove, and second inclined groove are arranged in pairs symmetrically around the circumference of the motor, which prevents the winding from protruding into the slot regardless of whether the direction of the winding start point relative to the winding portion is CCW (counterclockwise) or CW (clockwise), ensures alignment from the upper layer onwards, and reduces the size of the coil end. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide an insulator structure that can prevent the winding path from entering the slot, ensure alignment from the upper layer onwards, and reduce the size of the coil end. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an exploded perspective view of a motor according to an embodiment of the present invention. [Figure 2] 2 is a plan view of a part of the rotor in the circumferential direction of the motor as viewed from the axial direction, including a partial cross section. FIG. [Figure 3] FIG. 2 is a perspective view of an insulator attached to the teeth of the rotor. [Figure 4] FIG. 4 is a plan view of the inner peripheral piece of the insulator and its surroundings as viewed from the motor axial direction. [Figure 5] FIG. 6 is a cross-sectional view of FIG. 5 . DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <Motor 1> FIG. 1 is an exploded perspective view of a motor (rotating electric machine) 1 to which an embodiment of the present invention is applied. 1, the motor 1 includes a rotor 2, a stator 3, and a casing (not shown) that covers the rotor 2 and the stator 3. In this embodiment, the rotor 2 is disposed on the inner peripheral side of the stator 3. In other words, the motor 1 is an inner rotor type motor.

[0014] The motor 1 of the embodiment is a drive motor for an electric vehicle. The motor 1 of the embodiment is a wound field motor, and has a rotor structure that uses a field winding (coil 37) instead of a permanent magnet. By passing a direct current through the field winding from an external source, the motor 1 generates a magnetic flux in the rotor 2 and makes the field magnetic flux adjustable.

[0015] <Rotor 2> The rotor 2 has a rotating shaft 21, a rotor core 22, a plurality of magnetic pole portions 23, and a commutator 24. The rotating shaft 21 extends in an axial direction (motor axial direction) Da. The rotating shaft 21 is supported by a casing via bearings (neither of which are shown). The rotating shaft 21 is supported so as to be rotatable in a circumferential direction (motor circumferential direction) Dc about an axis C extending in the axial direction Da.

[0016] The rotor core 22 is provided outside (on the outer periphery of) the rotating shaft 21 in a radial direction (motor radial direction) Dr centered on the axis C. The rotor core 22 is formed in a cylindrical shape with the axis C as its axis. When viewed from the axial direction Da, a shaft insertion hole 22a through which the rotating shaft 21 is inserted is formed in the center of the rotor core 22. The rotor core 22 is rotatable integrally with the rotating shaft 21 in the circumferential direction Dc.

[0017] The magnetic pole portions 23 are arranged at equal intervals in the circumferential direction Dc on the outer periphery of the rotor core 22. Each magnetic pole portion 23 includes a coil 37. The coil 37 is formed by winding a wire 32 around the outer periphery of a tooth 35 formed on the rotor core 22, with an insulator 38 interposed therebetween. Details of the coil 37 and the insulator 38 will be described later.

[0018] The commutator 24 is provided coaxially on one end of the rotary shaft 21. The commutator 24 is rotatable in the circumferential direction Dc integrally with the rotary shaft 21. Brushes 25 supported by a casing are in contact with the commutator 24 so as to face each other in the radial direction Dr.

[0019] <Stator 3> The stator 3 is disposed on the outer circumferential side in the radial direction Dr relative to the rotor core 22 with an air gap therebetween. The stator 3 is fixed to the inner circumferential side in the radial direction Dr of the casing. The stator 3 has a stator core and a plurality of magnetic pole portions (neither of which are shown).

[0020] <Details of Rotor 2> The rotor 2 will now be described in more detail. As shown in FIG. 2, the rotor core 22 integrally includes an annular portion 34 and a plurality of teeth 35. The annular portion 34 is formed on the inner peripheral side (rotary shaft 21 side) of the rotor core 22. The annular portion 34 extends in the circumferential direction Dc and is formed in an annular shape when viewed from the axial direction Da.

[0021] The teeth 35 are formed at equal intervals in the circumferential direction Dc. Each tooth 35 extends from the outer periphery of the annular portion 34 toward the outer periphery along the radial direction Dr. A slot 36 is formed between adjacent teeth 35 in the circumferential direction Dc. The slot 36 is formed by cutting out the outer periphery of the rotor core 22.

[0022] The number of slots 36 and the number of teeth 35 are the same (eight in this embodiment). The rotor core 22 may be configured to be divisible in the circumferential direction Dc for each set of teeth 35. In the drawing, line Ct indicates the central axis of the teeth 35 (the protruding direction of the teeth 35 (motor radial direction Dr)). Hereinafter, the protruding direction of the teeth 35 will be referred to as the teeth axial direction Dt1, and the direction perpendicular to the teeth axial direction Dt1 will be referred to as the teeth radial direction Dt2.

[0023] The winding 32 is a conducting wire (e.g., copper wire) and is held in the rotor core 22 in the form of a coil 37. The winding 32 is wound around each of the multiple teeth 35 via an insulator 38 made of insulating resin. When viewed from the teeth axis direction Dt1, the winding 32 is wound in multiple layers around the outer periphery of the teeth 35. By winding the winding 32 around each tooth 35, the rotor 2 is formed with multiple coils 37 spaced apart in the circumferential direction Dc. A slot pole (insulating plate) 39 made of insulating resin is inserted between a pair of adjacent coils 37 in the circumferential direction Dc.

[0024] <Insulator 38> 2, the insulator 38 of this embodiment includes a flange-shaped outer peripheral piece 41 provided at one end (on the outer periphery of the motor) in the teeth axis direction Dt1, a flange-shaped inner peripheral piece 42 provided at the other end (on the inner periphery of the motor) in the teeth axis direction Dt1, and a cylindrical side wall portion (winding portion) 43 connecting the outer peripheral piece 41 and the inner peripheral piece 42 to each other. The internal space surrounded on three sides by the opposing surfaces 41 a, 42 a of the outer peripheral piece 41 and the inner peripheral piece 42 and the outer surface 43 a of the winding portion 43 serves as a storage portion 45 for storing the coil 37 formed by stacking the windings 32. A pair of storage portions 45 adjacent to each other in the motor circumferential direction Dc forms a slot 36. The windings 32 are densely arranged in the storage portion 45 in a so-called "tawara-pile" configuration.

[0025] 3 to 5, the winding portion 43 has a chamfered shape 43d formed at each corner between an axial end face 43b on one side in the motor axial direction Da and a circumferential end face 43c on both sides in the motor circumferential direction Dc. The chamfered shape 43d is, for example, a rounded chamfered shape, but may also be a flat chamfered shape. The winding portion 43 may also have a similar chamfered shape on the other side in the motor axial direction Da. The cross section shown in Fig. 5 is a cross section (VV cross section in Fig. 4) perpendicular to the central axis Ct of the insulator 38. Hereinafter, the cross section in Fig. 5 will be referred to as the "axially perpendicular cross section."

[0026] One side of the inner peripheral piece 42 in the motor axial direction Da has a pair of protrusions 46, 47 aligned in the motor circumferential direction Dc, and an inner peripheral recess 49 located between the pair of protrusions 46, 47. The pair of protrusions 46, 47 and the inner peripheral recess 49 may be provided only on one side in the motor axial direction Da, and may not be provided on the other side in the motor axial direction Da.

[0027] The pair of protrusions 46, 47 are arranged on opposite outer sides in the motor circumferential direction Dc. Each of the protrusions 46, 47 protrudes further toward the one side in the motor axial direction Da than the end face (base cross section 42c) of the inner circumferential piece 42 on that side in the motor axial direction Da. The opposing surface 42a of the inner circumferential piece 42 is an inclined surface that inclines from the inner side in the teeth radial direction Dt2 (toward the central axis Ct) to the outer side (side away from the central axis Ct) so that it is positioned more inward in the motor radial direction Dr (toward the motor inner circumferential side).

[0028] A protruding tip end surface 51 of each of the protruding portions 46, 47 toward one side in the motor axial direction Da is formed substantially parallel to the axial end surface 43b of the winding portion 43 (a plane perpendicular to the motor axial direction Da).

[0029] Referring to Figure 4, when viewed from the motor axial direction Da, the protruding tip surface 51 has an outer side 51a and an inner side 51b that extend at an angle along the motor circumferential direction Dc with respect to the tooth radial direction Dt2, a circumferential end side 51c that connects the outer ends of the outer side 51a and the inner side 51b in the motor circumferential direction Dc and extends along the motor radial direction Dr, a second outer side 51d that extends from the inner end of the outer side 51a in the motor circumferential direction Dc along the tooth radial direction Dt2, and an arc side 51e that convexly extends inward in the motor circumferential direction Dc and extends between the inner end of the second outer side 51d in the motor circumferential direction Dc and the inner end of the inner side 51b in the motor circumferential direction Dc.

[0030] The inner circumferential recess 49 is formed between the arcuate sides 51e of the pair of protruding portions 46, 47. The inner circumferential recess 49 is formed in the motor circumferential direction Dc, avoiding the protruding portions 46, 47. An end face of the inner circumferential recess 49 on one side in the motor axial direction Da corresponds to an end face (base end face 42c) on one side in the motor axial direction Da of the inner circumferential piece 42 excluding the protruding portions 46, 47.

[0031] The inner circumferential recess 49 is recessed toward the other side in the motor axial direction Da relative to each of the protrusions 46, 47. The inner circumferential recess 49 allows the winding 32 to be routed in the range between the protrusion tip surfaces 51 of the protrusions 46, 47 and the base end surface 42c of the inner circumferential recess 49 in the motor axial direction Da. The inner circumferential recess 49 allows the conductor (winding 32) to be inserted across an area inside the inner circumferential piece 42 in the motor radial direction Dr (an area where a conductor (crossover wire) that crosses between adjacent coils 37 is routed) and an area outside the inner circumferential piece 42 in the motor radial direction Dr (an area on the winding portion 43 side).

[0032] A protrusion inclined surface 48 is formed on the inner end (portion along the inner side 51 b) of each protrusion 46, 47 in the motor radial direction Dr. The protrusion inclined surface 48 is inclined so as to be positioned more outward in the motor radial direction Dr as it moves from one side (the side on which each protrusion 46, 47 itself is provided) in the motor circumferential direction Dc to the other side as viewed from the motor axial direction Da. The extension portion of the protrusion inclined surface 48 to the other side in the motor circumferential direction Dc intersects with the inner peripheral recess 49 as viewed from the motor axial direction Da.

[0033] As a result, when introducing the winding start portion 32a (see Figure 4) of the winding 32 from the inside of the motor radial direction Dr (the crossover wire side) to the outside of the motor radial direction Dr (the winding portion 43 side), if the conductor wound around one protrusion is pulled out to the other side of the motor circumferential direction Dc along the protrusion inclined surface 48, the conductor (winding 32) will naturally pass through the inner recess 49 and reach the outside of the inner peripheral piece 42 in the motor radial direction Dr.

[0034] On one side of the insulator 38 in the motor axial direction Da, an inclined groove portion 52 is formed on the opposing surface 42a of the inner peripheral piece 42, inclined so as to follow the extension of the protruding inclined surface 48 when viewed from the motor axial direction Da. 4, the inclined groove 52 allows the winding 32, which extends from one of the protrusions 46, 47 (the left protrusion 46 in the example of FIG. 4) and passes through the inner peripheral recess 49, to fall into the groove while extending linearly when viewed from the motor axial direction Da. This inclined groove 52, in combination with the protrusion inclined surface 48, effectively guides the winding 32 to a specified routing path and prevents the winding 32, which intersects with the opposing surface 42a, from protruding above the opposing surface 42a.

[0035] As shown in FIGS. 3 to 5, on one side of the insulator 38 in the motor axial direction Da, the wound portion 43 has chamfered shapes 43d formed at both corners in the motor circumferential direction Dc. A second inclined groove portion 54 is formed on one side of the insulator 38 in the motor axial direction Da so as to be continuous with the inclined groove portion 52 in the direction extending outward in the motor circumferential direction Dc when viewed from the motor axial direction Da. The second inclined groove portion 54 is continuous with the inclined groove portion 52 so as to form a straight line when viewed from the motor axial direction Da.

[0036] For example, when chamfered shape 43d of winding portion 43 is a rounded chamfer, second inclined groove portion 54 is formed so as to follow a tangent to chamfered shape 43d of winding portion 43 in the cross section orthogonal to the axis shown in Fig. 5. When chamfered shape 43d of winding portion 43 is a flat chamfer, second inclined groove portion 54 may be formed so as to follow chamfered shape 43d of winding portion 43 in the cross section orthogonal to the axis. This allows winding 32 to smoothly merge with a corner of winding portion 43 and be wound when winding 32 is introduced from the transition region toward winding portion 43, thereby preventing bending or curvature at winding start portion 32a of winding 32.

[0037] Chamfered shapes 43d are groove-like shapes that follow the outer diameter of each of the wires 32 wound around winding portion 43, and are arranged in a wave-like pattern in the teeth axis direction Dt1. This makes it easier to determine the position of each of the wires 32 in the teeth axis direction Dt1, ensuring the alignment of the wires 32.

[0038] 4, when viewed from the motor axial direction Da, each of the protrusions 46, 47, the inclined groove 52, and the second inclined groove 54 is provided in pairs symmetrically about the central axis Ct of the tooth 35. This ensures that the winding 32 is well guided to the specified routing path and prevents the winding start 32a of the winding 32 from protruding from the routing path, regardless of whether the direction of the winding start 32a of the winding 32 relative to the winding portion 43 is counterclockwise (CCW) as shown in FIG. 4 or the opposite (clockwise (CW)).

[0039] In this embodiment, a displacement portion 56 is formed on one end face of the inner peripheral recess 49 on one side in the motor axial direction Da of the insulator 38 in the motor axial direction Da (the base end face 42c of the inner peripheral piece 42) of the inner peripheral recess 49, the end face having a lower protruding height in the motor axial direction Da than the protruding portions 46, 47. When viewed from the motor axial direction Da, the displacement portion 56 has an outer shape in which the second outer side 51d and the inner side 51b of the protruding portion 46 on one side in the motor circumferential direction Dc (the protruding portion 46 on the side where the winding start portion 32a of the winding 32 contacts the protruding-portion inclined surface 48) are extended to the vicinity of the central axis Ct. A step having a height equivalent to the diameter of the conductor is formed in the outer shape of the displacement portion 56 when viewed from the motor axial direction Da.

[0040] The winding start portion 32a of the winding 32 extends along the inner side 51b, avoiding the displacement portion 56, and is wound around the winding portion 43 through the inclined groove portion 52 and the second inclined groove portion 54 on the protruding portion 47 side on the other side in the motor circumferential direction Dc. The winding end portion (not shown) of the winding 32 is drawn out of the coil 37 through the second inclined groove portion 54 and the inclined groove portion 52 on the protruding portion 46 side on one side in the motor circumferential direction Dc, and intersects with the winding start portion 32a as it passes through the inner circumferential recess 49. At this time, the winding end portion extends over the displacement surface 56a of the displacement portion 56, and therefore does not ride up onto the winding start portion 32a on the base end surface 42c, preventing the intersection from protruding in the motor axial direction Da.

[0041] As described above, the insulator structure in the above embodiment is a structure of an insulator 38 attached to each of a plurality of teeth 35 arranged in the motor circumferential direction Dc, the insulator structure comprising: an outer peripheral piece 41 provided on one end side of the tooth 35 in the teeth axis direction Dt1 along the motor radial direction Dr; an inner peripheral piece 42 provided on the other end side of the tooth 35 in the teeth axis direction Dt1 and facing the outer peripheral piece 41 in the teeth axis direction Dt1; and a winding portion 43 that covers the outer periphery of the tooth 35 when viewed from the teeth axis direction Dt1, connects the outer peripheral piece 41 and the inner peripheral piece 42, and has the winding 32 wound therearound. The space surrounded by the first opposing surface 41a of the outer peripheral piece 41 facing the inner peripheral piece 42, the second opposing surface 42a of the inner peripheral piece 42 facing the outer peripheral piece 41, and the outer surface 43a of the winding portion 43 serves as a storage section 45 for the winding 32. One side of the inner peripheral piece 42 in the motor axis direction Da is provided with a first opposing surface 41a of the outer peripheral piece 41 facing the inner peripheral piece 42, the second opposing surface 42a of the inner peripheral piece 42 facing the outer peripheral piece 41, and the outer surface 43a of the winding portion 43. The insulator 38 has protruding portions 46, 47 arranged on one side (on both outer sides in this embodiment) of the motor circumferential direction Dc and protruding further toward one side in the motor axial direction Da than the winding portion 43, and an inner circumferential recess 49 arranged in the motor circumferential direction Dc to avoid the protruding portions 46, 47 (inward in the motor circumferential direction Dc) and recessed in the motor axial direction Da relative to the protruding portions 46, 47, allowing the winding 32 to be inserted across the inner and outer sides of the inner circumferential piece 42 in the motor radial direction Dr. The protruding portions 46, 47 have protruding portion inclined surfaces 48 at their ends on the inner side in the motor radial direction Dr, which are inclined so as to be positioned more outward in the motor radial direction Dr as they move from one side in the motor circumferential direction Dc to the other side, as seen from the motor axial direction Da, and whose extension portion to the other side in the motor circumferential direction Dc intersects with the inner circumferential recess 49. The insulator 38 has an inclined groove portion 52 at one side in the motor axial direction Da, which is inclined to follow the extension portion of the protruding portion inclined surfaces 48, as seen from the motor axial direction Da, allowing the winding 32 to be inserted.

[0042] According to this configuration, protrusions 46, 47 are formed on one side of inner peripheral piece 42 of insulator 38 in the motor axial direction Da as portions for winding conductors, and inner peripheral recesses 49 are formed at positions avoiding protrusions 46, 47. Protrusion inclined surfaces 48 are formed at the ends of protrusions 46, 47 on the outer side of motor radial direction Dr, inclining outward in motor radial direction Dr (toward winding section 43). In the extending direction of protrusion inclined surfaces 48, inner peripheral recesses 49 through which winding 32 passes and inclined grooves 52 into which winding 32 is inserted are formed. When winding 32 is introduced from a transition region inside inner peripheral piece 42 in the motor radial direction Dr toward winding section 43, winding 32 is introduced along protrusion inclined surfaces 48 toward winding section 43, whereby winding 32 extends linearly, passes through inner peripheral recesses 49, and is inserted into inclined grooves 52. In this way, storing the winding start portion 32a of the winding 32 in the inclined groove portion 52 and guiding the winding 32 from the inner peripheral piece 42 side (the inner side in the motor radial direction Dr) toward the winding portion 43 improves the workability of the winding 32. Furthermore, the inclination from the inner side in the motor radial direction Dr to the outer side improves the adhesion of the winding 32 to the winding portion 43, preventing the winding 32 from protruding into the slot 36, ensuring alignment of the upper and subsequent layers, and enabling the physical size of the coil end to be reduced.

[0043] In the above insulator structure, in a cross section intersecting with the motor radial direction Dr, the winding portion 43 has a chamfered shape 43d formed at a corner between an axial end face 43b on one side in the motor axial direction Da and a circumferential end face 43c on the other side in the motor circumferential direction Dc. One side of the insulator 38 in the motor axial direction Da has a second inclined groove portion 54 that is inclined to follow the chamfered shape 43d in a cross section intersecting with the motor radial direction Dr, is connected to the inclined groove portion 52 in the extension direction toward the other side in the motor circumferential direction Dc as viewed from the motor axial direction Da, and allows the winding 32 to be inserted. According to this configuration, the winding 32 can be inserted into the second inclined groove portion 54 that communicates with the inclined groove portion 52 in the extension direction, and the second inclined groove portion 54 is inclined in cross section to follow the chamfered shape 43d of the winding portion 43, so that when the winding 32 is introduced from a transition region that is inside the inner peripheral piece 42 in the motor radial direction Dr toward the winding portion 43, the winding 32 smoothly merges with a corner in cross section of the winding portion 43. This suppresses bending and curvature at the winding start portion 32a of the winding 32 and improves adhesion between the winding 32 and the insulator 38, thereby preventing the winding 32 from protruding into the slot 36, ensuring alignment from the upper layer onwards, and enabling the physical size of the coil end to be reduced.

[0044] In the insulator structure described above, the protrusions 46, 47, the inclined groove 52 and the second inclined groove 54 are provided in pairs symmetrically with respect to the central axis Ct of the tooth 35 as an axis of symmetry when viewed in the motor axial direction Da. According to this configuration, the protrusions 46, 47, the inclined groove 52, and the second inclined groove 54 are arranged in pairs symmetrically in the circumferential direction Dc of the motor, thereby preventing the winding 32 from protruding into the slot 36 regardless of whether the direction of the winding start portion 32a of the winding 32 relative to the winding portion 43 is CCW (counterclockwise) or CW (clockwise), ensuring alignment from the upper layer onwards and reducing the physical size of the coil end.

[0045] The present invention is not limited to the above-described embodiments. For example, the insulator structure of the embodiments may be applied to rotating electric machines other than vehicle drive motors. For example, the rotating electric machine illustrated in the embodiments is an inner rotor motor, but is not limited to this configuration. For example, the rotating electric machine may be an outer rotor type in which the rotor is disposed on the outer periphery of the stator. Furthermore, the rotating electric machine is not limited to a motor, and may also be a generator. The insulator structure may be applied to a stator insulator instead of a rotor insulator. The configurations in the above-described embodiments are merely examples of the present invention, and various modifications are possible without departing from the spirit of the present invention, such as replacing the components of the embodiments with well-known components. [Explanation of symbols]

[0046] 1. Motor (rotating electric machine) 2 rotors 3 Stator 21 Rotation axis 22 rotor core 32 windings 35 Teeth 38 Insulator 41 Outer piece 41a First opposing surface 42 Inner peripheral piece 42a Second facing surface 43 Winding section 43a External surface 43b Axial end face 43c Circumferential end face 43d chamfered shape 45 Storage area 46,47 Protrusion 48 Projection slope 49 Inner recess 52 Slanted groove 54 Second inclined groove part Ct center axis Da Axial direction (motor axis direction) Dc Circumferential direction (motor circumferential direction) Dr Radial direction (motor radial direction) Dt1 Teeth axial direction Dt2 Teeth radial direction

Claims

1. Insulators are attached to a plurality of teeth arranged in a circumferential direction of a motor, and each of the teeth has an outer peripheral piece provided on one end side of the tooth in a tooth axis direction along the radial direction of the motor; an inner peripheral piece provided on the other end of the tooth in the tooth axis direction and facing the outer peripheral piece in the tooth axis direction; a winding portion that covers an outer periphery of the tooth when viewed in the motor axial direction, connects the outer periphery piece and the inner periphery piece, and has a winding wound thereon; a space surrounded by a first opposing surface of the outer peripheral piece facing the inner peripheral piece, a second opposing surface of the inner peripheral piece facing the outer peripheral piece, and an outer surface of the winding portion serves as a storage section for the winding, a protruding portion disposed on one side of the inner peripheral piece in the motor axial direction and protruding further toward the one side of the motor axial direction than the winding portion; and an inner peripheral recess portion disposed in the motor circumferential direction to avoid the protruding portion, recessed in the motor axial direction relative to the protruding portion, and allowing the winding to be inserted across the inner and outer sides of the inner peripheral piece in the motor radial direction, an inward end of the protrusion in the motor radial direction has a protrusion inclined surface that is inclined so as to be positioned more outward in the motor radial direction as it moves from one side to the other side in the motor circumferential direction, as viewed in the motor axial direction, and whose extension to the other side in the motor circumferential direction intersects with the inner peripheral recess; an inclined groove portion, which is inclined along the extension portion of the protruding portion inclined surface as viewed from the motor shaft direction on one side of the insulator in the motor shaft direction, and which allows the winding to be inserted into an end portion of the protruding portion on an inner side in the motor radial direction; a pair of the protrusions and the inclined grooves are provided symmetrically with respect to a central axis of the teeth as an axis of symmetry when viewed from the motor axial direction, An insulator structure, characterized in that the inner peripheral recess is located between a pair of the protrusions.

2. a chamfered shape is formed at a corner portion between an axial end surface on one side in the motor axial direction and a circumferential end surface on the other side in the motor circumferential direction in a cross section intersecting with the motor radial direction, 2. The insulator structure according to claim 1, wherein the insulator has a second inclined groove portion on one side in the motor axial direction, the second inclined groove portion being inclined to follow the chamfered shape in the cross section intersecting the motor radial direction, and continuing in an extension direction of the inclined groove portion toward the other side in the motor circumferential direction as viewed from the motor axial direction, allowing the winding to be inserted.

3. An insulator structure as described in Claim 2, characterized in that the second inclined groove portions are arranged in pairs symmetrically with the central axis of the teeth as the axis of symmetry when viewed from the motor axial direction.

4. 4. The insulator structure according to claim 1, wherein a displacement portion is formed on an end face of the inner recess on one side in the motor axial direction, the displacement portion having a lower protruding height in the motor axial direction than the protruding portion.

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