JP2023048366A - Stator and rotary electric machine - Google Patents

Abstract

To provide a stator capable of suppressing contact of a coil conductor to a corner of a tooth part without increasing a gap part between the coil conductor and a side face of the tooth part, and to provide a rotary electric machine.SOLUTION: A stator comprises a stator core, a pair of insulators 15A, and a coil conductor. In the stator core, a plurality of tooth parts 13 having substantially cross sections protrude radially inward from an annular core body part. The insulator 15A covers two shaft end faces 19 facing a core axial direction among side faces around a projecting direction of each tooth part 13. The coil conductor is wound to each tooth part 13 through a pair of insulators 15A. Each insulator 15A includes an extension part 30 whose front end extends outward in a core circumferential direction from an end part 25 with a gap d1 in a core axial direction with respect to the end part 25 in the core circumferential direction of the shaft end face of the tooth part 13 in a previous state in which the coil conductor is wound.SELECTED DRAWING: Figure 6

Description

The present invention relates to stators and rotating electric machines.

2. Description of the Related Art As a rotating electrical machine, there is one in which a rotor is rotatably arranged on the inner peripheral side of an annular stator. In the stator, for example, a plurality of teeth portions having a substantially rectangular cross section protrude radially inward from an annular core body portion, and a coil conductor wire is wound around each teeth portion via a resin insulator. The insulator is usually attached to the teeth so as to cover the entire periphery of the teeth in the protruding direction.

However, if the entire periphery of the tooth portion in the protruding direction is covered with the insulator, the heat transfer efficiency from the coil wire to the tooth portion (stator core) tends to decrease, and the space factor of the coil wire tends to be disadvantageous. .

As a countermeasure, a stator structure has been devised in which insulators are attached only to some of the side surfaces around the protruding direction of the teeth (see, for example, Patent Document 1).

In the stator disclosed in Patent Document 1, two axial end faces facing the core axial direction (direction along the axial direction of the stator core), of the side faces around the protruding direction of the tooth portion, are provided so as to cover these side faces. A cap-shaped insulator is attached to each. When this configuration is adopted, the remaining two side surfaces around the protruding direction of each tooth portion are not covered by the insulator, so the heat transfer efficiency from the coil wire to the tooth portion (stator core) is improved, and the space factor of the coil wire is also improved. increase.

Japanese Patent No. 6479179

However, in the stator disclosed in Patent Document 1, the width of the tooth cover portion of each insulator in the core circumferential direction (the direction along the circumferential direction of the stator core) is the same as the width of the shaft end face of the tooth portion in the core circumferential direction. , and the outer end of the tooth cover in the core circumferential direction is in contact with the corner of the shaft end surface of the tooth. Therefore, when the coil wire is wound around the insulator, if the insulator is deformed or misaligned, the coil wire may come into direct contact with the corners of the teeth, causing deterioration of the coil wire. be.

Further, if the width of the tooth covering portion (insulator) in the core circumferential direction is set to be larger than the width of the axial end surface of the tooth portion in the core circumferential direction, the coil wire will not be bent at the corners of the tooth portion when the coil wire is wound. It is possible to prevent direct contact with the part. However, in this case, the ends of the tooth cover portions (insulators) in the core circumferential direction protrude outward from the corners of the axial end surfaces of the tooth portions. For this reason, when the coil wire is wound around the teeth, gaps in which the coil wire floats are likely to form in the vicinity of the corners of the side surfaces of the teeth (side surfaces adjacent to the axial end surfaces). These gaps are likely to cause a decrease in heat transfer efficiency from the coil conductors to the teeth (stator core) and a decrease in the space factor of the coil conductors.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a stator and a rotating electrical machine that can suppress the contact of the coil conductors with the corners of the teeth without increasing the gaps between the coil conductors and the side surfaces of the teeth. and

A stator and a rotating electric machine according to the present invention employ the following configurations in order to solve the above problems.
That is, in the stator according to the present invention, a plurality of teeth portions having a substantially rectangular cross section (for example, the tooth portions 13 in the embodiment) extend radially inward from an annular core body portion (for example, the core body portion 12 in the embodiment). A protruding stator core (for example, the stator core 14 of the embodiment) and two axial end portions of side surfaces around the protruding direction of each of the teeth portions facing the core axial direction (for example, the core axial direction Ax of the embodiment). A pair of insulators (for example, the insulators 15A and 15B of the embodiment) respectively covering the surfaces (for example, the shaft end surface 19 of the embodiment), and a coil conductor wound around each of the teeth through the pair of insulators. (for example, the coil conductor 16 of the embodiment), and each of the insulators, in a state before the coil conductor is wound, extends in the core circumferential direction of the axial end surface of the tooth portion (for example, the coil conductor 16 in the embodiment). A gap (for example, the gap d1 in the embodiment) is provided in the core axial direction with respect to the end in the core circumferential direction C) (for example, the end 25 in the embodiment). The distal end portion 30b) of the core is provided with an extending portion (for example, the extending portion 30 of the embodiment) extending outward in the core circumferential direction from the end portion.

According to the above configuration, before the coil conductor is wound around the insulator and the tooth portion, the distal end portion of the extension portion of each insulator extends outward in the core circumferential direction from the axial end surface of the tooth portion. Also, a gap is formed in the axial direction of the core with respect to the shaft end surface. When the coil conductor is wound around the outside of the insulator from this state, the extension of the insulator is flexurally deformed so as to approach the end (corner) of the axial end surface of the tooth portion due to the tightening by the coil conductor. do. As a result, the tip of the extending portion of the insulator comes into contact with or comes close to the end (corner) of the shaft end surface. ) is regulated. On the other hand, since the tip of the extending portion of the insulator is in contact with or close to the corner of the end of the shaft end surface, there is a gap between the wound coil conductor wire and the side surface of the teeth. less likely to occur.

The extending portion has a gap in the core axial direction (for example, the gap d2 in the embodiment) with the shaft end surface in a region overlapping the shaft end surface in the core circumferential direction. A larger base region (eg, base region 30a in the embodiment) may be provided.

In this case, when a load due to tightening of the coil conductor wire acts on the extension portion when the coil conductor wire is wound, the portion from the base region to the tip portion of the extension portion undergoes large bending deformation. As a result, the distal ends of the extending portions reliably come into contact with or come close to the corners of the shaft end surfaces of the teeth.

The insulator may include a leg portion (for example, the leg portion 29 of the embodiment) that abuts against the shaft end face in the central region in the core circumferential direction.

In this case, the legs of the central region of the insulator in the core circumferential direction come into contact with the axial end surfaces of the tooth portions, so that when the coil conductor is wound, the tips of the extending portions center on the legs. flexural deformation toward the corners of the shaft end face of the shaft.

The insulator includes a tooth cover portion (for example, the tooth cover portion 39 in the embodiment) that covers the axial end surface of the tooth portion, and a core radial direction of the tooth cover portion (for example, the core radial direction R in the embodiment). and an outer flange (for example, the outer flange 40fo of the embodiment) provided on the outside of the coil conductor to regulate the winding position of the coil conductor, and the outer flange is provided on the inner peripheral surface of the core body portion A positioning projection (for example, the projection 41 in the embodiment) that fits into the locking portion (for example, the locking groove 42 in the embodiment) may protrude.

In this case, the positioning projections provided on the outer flange portion are fitted into the engagement portions on the inner peripheral surface of the core body portion, thereby suppressing positional deviation of the tooth cover portion with respect to each tooth portion. In addition, since the locking portion into which the positioning projection is fitted is provided on the inner peripheral surface of the core body portion where the coil conductor is not wound, the formation of the locking portion adversely affects the space factor of the coil conductor. does not affect

The extending portion may be provided with a deflection allowance groove (for example, the deflection allowance groove 35 in the embodiment) extending along the core radial direction.

In this case, the bending deformation of the extending portion accompanying the winding of the coil wire is facilitated by the bending allowance groove extending along the core radial direction.

The insulator includes a tooth cover portion (for example, the tooth cover portion 39 of the embodiment) that covers the axial end surface of the tooth portion, and a tooth cover portion that is provided outside the tooth cover portion in the core radial direction and around which the coil conductor is wound. An outer flange (for example, the outer flange 40fo of the embodiment) that regulates the position and an inner flange (for example, the inner flange 40fo of the embodiment) that is provided inside the tooth cover portion in the core radial direction and regulates the winding position of the coil conductor. and a slit (for example, the slit 38 of the embodiment) extending along the core circumferential direction between the extension and the outer flange and between the extension and the inner flange. ) may be provided.

In this case, slits are provided between the extending portion and the outer flange and between the extending portion and the inner flange, respectively. less likely to be hindered by Therefore, when the coil conductor is wound, the distal ends of the extending portions reliably come into contact with or come close to the corners of the axial end surfaces of the tooth portions.

Further, a rotating electric machine according to the present invention is a rotating electric machine including a stator and a rotor rotatably disposed radially inward of the stator, wherein the stator extends approximately from an annular core main body. A stator core composed of a plurality of rectangular cross-section teeth protruding radially inward, and a pair of insulators covering two axial end faces of the side surfaces of the teeth around the protruding direction, which face the core axial direction, respectively. and a coil conductor wound around each of the teeth via a pair of the insulators, each of the insulators, in a state before the coil conductors are wound, at the axial ends of the teeth. It is characterized in that the tip portion is provided with an extending portion extending outward in the core circumferential direction from the end portion of the surface in the core circumferential direction while leaving a gap in the core axial direction.

In the stator and the rotary electric machine according to the present invention, before the coil conductors are wound around the insulator and the teeth, the tips of the extending portions of the insulators are positioned closer to the core than the axial end surfaces of the teeth. It extends outward in the circumferential direction and forms a gap in the axial direction of the core with the shaft end surface. Therefore, when the coil wire is wound, the tip of the extending portion of the insulator is flexurally deformed so as to approach the corner of the axial end surface of the tooth portion, so that the coil wire is wound against the corner of the axial end surface. contact is suppressed, and gaps are less likely to occur between the coil conductors and the side surfaces of the teeth.
Therefore, when the stator or the rotary electric machine according to the present invention is employed, contact of the coil conductors with the corners of the teeth is suppressed without increasing the gap between the coil conductors and the side surfaces of the teeth. be able to.

FIG. 2 is a cross-sectional view showing part of the rotary electric machine of the embodiment with a phantom line. 4 is a perspective view of a winding block of the stator of the embodiment; FIG. FIG. 2 is an exploded perspective view of the winding block of the embodiment with the coil conductors removed. The perspective view of the insulator of embodiment. FIG. 3 is a cross-sectional view taken along line VV in FIG. 2; Sectional drawing similar to FIG. 7 before winding a coil conductor. FIG. 3 is a cross-sectional view taken along line VII-VII of FIG. 2; Sectional drawing similar to FIG. 6 of the stator of other embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing part of a rotating electric machine 1 of this embodiment in phantom lines. The rotary electric machine 1 includes a substantially cylindrical (substantially annular) stator 10 and a rotor 11 concentrically arranged on the inner peripheral side of the stator 10 . The stator 10 is fixed to a casing (not shown), and the rotor 11 is rotatably supported by the casing via bearings (not shown). Therefore, the rotor 11 is rotatable with respect to the stator 10 .
Note that FIG. 1 shows a cross section of the stator 10 and the rotor 11 cut in a direction orthogonal to their axial directions.

The stator 10 includes a stator core 14 in which a plurality of teeth 13 protrude radially inward from a cylindrical (annular) core body 12 , and the stator core 14 is mounted so as to partially cover each tooth 13 . insulators 15A and 15B, and coil conductors 16 wound around the teeth 13 so as to partially cover the insulators 15A and 15B. The insulators 15A and 15B are made of an insulating resin material. The coil conductor 16 is wound around the periphery of each tooth portion 13 in the projecting direction by a concentrated winding method.
In the following description, the direction along the central axis of the stator core 14 (the rotation axis of the rotor 11) is referred to as the "core axial direction", the direction along the circumferential direction of the stator core 14 is referred to as the "core circumferential direction", and the radial direction of the stator core 14. are referred to as "core radial directions". Note that Ax pointing in the axial direction of the core, an arrow C pointing in the circumferential direction of the core, and an arrow R pointing in the radial direction of the core are shown at appropriate places in the drawing.

The stator core 14 of this embodiment adopts a split core system that can be split in the circumferential direction. That is, the stator core 14 is configured by annularly connecting divided cores 14a that are divided in the circumferential direction for each tooth portion 13 . Each split core 14a is configured by, for example, stacking a plurality of electromagnetic steel sheets. The basic configuration of each split core 14a is substantially the same.

FIG. 2 is a perspective view of a winding block 17 in which a coil wire 16 is wound around a split core 14a via insulators 15A and 15B. FIG. 3 is an exploded perspective view of the winding block 17 with the coil wire 16 removed.
The split core 14a includes a back yoke portion 18 extending in an arcuate shape along the core circumferential direction C, teeth portions 13 projecting inward in the core radial direction R from the center of the back yoke portion 18 in the core circumferential direction C, It has The back yoke portion 18 is a portion that forms the annular core body portion 12 of the stator core 14 when the split cores 14a are annularly connected. The back yoke portion 18 has a substantially arcuate cross-sectional shape perpendicular to the core axial direction Ax. Adjacent split cores 14a are connected to each other by abutting the end faces of the back yoke portions 18 in the core circumferential direction C and by recess-and-projection fitting.

The tooth portion 13 has a substantially rectangular cross section perpendicular to the core radial direction R, and the substantially rectangular cross section extends along the core radial direction R. As shown in FIG. A more detailed cross-sectional shape of the tooth portion 13 is a rectangular cross-sectional shape having long sides along the core axial direction Ax and short sides perpendicular to the core axial direction Ax. Hereinafter, two side surfaces corresponding to the short sides of the cross section of the four side surfaces around the protruding direction of the tooth portion 13 are referred to as "shaft end surfaces 19", and the side surfaces corresponding to the long sides of the cross section are simply referred to as "side surfaces. 20”. The axial end surfaces 19 are arranged at both ends of the teeth 13 in the core axial direction Ax, and the side surfaces 20 are arranged at both ends of the teeth 13 in the core circumferential direction C. A flange portion 21 protruding to both sides in the core circumferential direction C extends from the inner end portion of the core 13 in the core radial direction R. As shown in FIG.

4 is a perspective view of the insulator 15A, and FIG. 5 is a cross-sectional view of the winding block 17 taken along line VV in FIG. 7 is a cross-sectional view of the winding block 17 taken along line VII-VII in FIG. FIG. 6 is a cross-sectional view similar to FIG. 7 of the winding block 17 before the coil wire 16 is wound.
The insulators 15A and 15B are provided integrally with a tooth cover portion 39 that covers the axial end surface 19 of the tooth portion 13 and on the outer side of the tooth cover portion 39 in the core radial direction R so that the coil conductor 16 is wound radially outward. An outer flange 40fo for regulating the position and an inner flange 40fi for regulating the radially inner winding position of the coil conductor 16 are provided integrally on the inner side of the tooth cover portion 39 in the core radial direction R. One insulator 15A covers the outside of one axial end surface 19 of the tooth portion 13 and the other insulator 15B covers the outside of the other axial end surface 19 of the tooth portion 13 . The outer flange 40fo and the inner flange 40fi protrude outward in the core axial direction Ax and to one side and the other side in the core circumferential direction C with respect to the tooth covering portion 39 .

As shown in FIGS. 3 and 4, of the outer flanges 40fo of the insulators 15A and 15B, the portions protruding to one side and the other side in the core circumferential direction C from the tooth covering portion 39 are Rectangular plate-like projections 41 projecting toward the split core 14a direction are provided respectively. On the other hand, locking grooves 42 extending along the core axial direction Ax are formed on the inner peripheral surfaces of the back yoke portion 18 of the split core 14a positioned on both outer sides of the tooth portions 13 in the core peripheral direction C. formed respectively. The protrusions 41 of the insulators 15A and 15B are fitted into corresponding locking grooves 42 of the back yoke portion 18 from the core axial direction Ax. The insulators 15A and 15B are thereby positioned with respect to the split core 14a.
In this embodiment, the projection 41 of the outer flange 40fo constitutes a positioning projection, and the locking groove 42 of the back yoke portion 18 constitutes a locking portion on the core body portion 12 side.

Further, of the inner flanges 40fi of the insulators 15A and 15B, a portion projecting to one side in the core circumferential direction C and a portion projecting to the other side in the core circumferential direction C from the tooth cover portion 39 protrude toward the split core 14a. A plate-like locking piece 43 is protrudingly provided for each. Each locking piece 43 is locked to the flange portion 21 on the distal end side of the tooth portion 13 of the split core 14a. The inner ends of the insulators 15</b>A and 15</b>B in the core radial direction R are thereby positioned on the tip end side of the tooth portion 13 .
In this embodiment, the two insulators 15A and 15B are symmetrical in shape, but have substantially the same shape. Therefore, the detailed shape of one insulator 15A will be described below, and the detailed shape of the other insulator 15B will be omitted.

In the insulator 15A, as shown in FIG. 4, the tooth covering portion 39 is arranged between the outer flange 40fo and the inner flange 40fi. The tooth covering portion 39 has a flat central region in the core circumferential direction C of the outer surface (the surface facing outward in the core axial direction Ax), and both outer edges in the core circumferential direction C of the outer surface are the tooth portions 13 . It curves smoothly toward the side (lower side in FIG. 4).

As shown in FIG. 6, the tooth covering portion 39 of the insulator 15A has a leg portion 29 that abuts on the axial end surface 19 of the tooth portion 13 in the center region of the tooth covering portion 39 in the core circumferential direction C. As shown in FIG. The leg portion 29 extends in the core radial direction R so as to connect the outer flange 40fo and the inner flange 40fi. Further, the tooth cover portion 39 has two extensions extending from the end portion of the leg portion 29 in the core axial direction Ax (the end portion on the side spaced from the axial end surface 19) in one side and the other side in the core circumferential direction C. A section 30 is provided.

Each extending portion 30 of the tooth cover portion 39 extends from the end of the leg portion 29 in the core circumferential direction C substantially parallel to the axial end surface 19 of the tooth portion 13, and then approaches the axial end surface 19. curved towards. Hereinafter, a region of the extending portion 30 that extends from the end of the leg portion 29 in substantially parallel with the shaft end surface 19 is referred to as a "base region 30a", and is curved toward the shaft end surface 19 from the base region 30a. The end portion extending downward is referred to as a "tip portion 30b". In the present embodiment, the extending portion 30 has a substantially constant thickness over substantially the entire region from the base region 30a to the distal end portion 30b.

As shown in FIG. 6, in a state before the coil conductor 16 is wound around the outside of the insulator 15A, the extending portion 30 extends from the end portion 25 in the core circumferential direction C of the axial end surface 19 on the tooth portion 13 side. The tip portion 30b protrudes outward in the core circumferential direction C by a predetermined length L with respect to (the corner portion of the boundary between the shaft end surface 19 and the side surface 20). At this time, a gap d<b>1 in the core axial direction Ax is secured between the distal end portion 30 b of the extension portion 30 and the axial end surface 19 of the tooth portion 13 . That is, the extending portion 30 has a gap d1 in the core axial direction Ax with respect to the end portion 25 of the shaft end surface 19 in the core circumferential direction C, and the distal end portion 30b extends toward the end portion of the shaft end surface 19. It extends outside in the core circumferential direction C from 25 .

Here, as shown in FIG. 6, the base region 30a of each extending portion 30 is in a region that overlaps with the axial end face 19 of the tooth portion 13 in the core circumferential direction C. As shown in FIG. In the base region 30a of the extending portion 30, the gap d2 in the core axial direction Ax with the shaft end surface 19 is larger than the gap d1 between the tip portion 30b of the extending portion 30 and the shaft end surface 19. there is A deflection allowance groove 35 extending along the core radial direction R is formed in a portion of the base region 30a of each extending portion 30 near the tip portion 30b (a portion where bending toward the tip portion 30b starts). . The deflection allowance groove 35 is formed in a concave shape on the outer surface side of the extending portion 30 (the surface facing outward in the core axial direction Ax).

Moreover, as shown in FIG. 4, a slit 38 extending along the core circumferential direction C is formed between each extending portion 30 of the insulator 15A and the outer flange 40fo. Similarly, a slit 38 extending along the core circumferential direction C is also formed between each extending portion 30 of the insulator 15A and the inner flange 40fi. Each slit 38 extends from the base region 30a toward the tip portion 30b at the outer end and the inner end of the extending portion 30 in the core radial direction R. As shown in FIG.

Each insulator 15A, 15B is attached to each end of the split core 14a in the core axial direction Ax, and in this state, when the coil wire 16 is wound around the protruding direction of the tooth portion 13, as shown in FIG. , the extending portions 30 of the insulators 15A and 15B are curved and deformed toward the teeth portion 13 by tightening by the coil conductors 16 . Specifically, when the extending portions 30 of the insulators 15A and 15B are pressed from the outside by tightening the coil conductors 16, the tip portions 30b of the extending portions 30 move toward the ends of the axial end surfaces 19 of the tooth portions 13. The extending portion 30 is flexurally deformed so as to come into contact with or close to 25 . At this time, the outer surface of the tip portion 30 b of the extension portion 30 is substantially aligned with the side surface 20 of the tooth portion 13 . Therefore, the coil conductor 16 wound across the side surfaces of the insulators 15A and 15B and the teeth 13 does not contact the corners of the teeth 13 (ends 25 of the shaft end faces 19), and the insulators The teeth cover portions 39 of 15A and 15B and the side surfaces 20 of the teeth portion 13 are in close contact with each other.

In the stator 10 (rotating electric machine 1) of the present embodiment, before the coil conductors 16 are wound around the insulators 15A and 15B and the tooth portions 13, the tip portions 30b of the extension portions 30 of the insulators 15A and 15B are , extends outward in the core circumferential direction C from the axial end surface 19 of the tooth portion 13 and forms a gap d1 in the core axial direction Ax between the axial end surface 19 and the axial end surface 19 . Therefore, when the coil conductor 16 is wound around the teeth 13, the tips 30b of the extensions 30 of the insulators 15A and 15B are positioned at the corners (ends 25) of the axial end surfaces 19 of the teeth 13. It bends and deforms so that it approaches. As a result, direct contact of the coil wire 16 with the corners (ends 25) of the shaft end surfaces 19 of the teeth 13 is suppressed by the distal ends 30b of the extensions 30 of the insulators 15A and 15B. A void portion is less likely to occur between the coil conductor 16 and the side surface 20 of the tooth portion 13 .
Therefore, when the stator 10 (rotating electric machine 1) of the embodiment is adopted, the coil conductors can be adjusted to the corners of the teeth portions 13 without increasing the gaps between the coil conductors 16 and the side surfaces 20 of the teeth portions 13 . 16 contact can be suppressed. Therefore, it is possible to simultaneously prevent deterioration of the coil wire 16 and improve the space factor of the coil wire 16 .

Further, in the stator 10 (rotary electric machine 1) of the present embodiment, the gap d2 in the core axial direction Ax between the base region 30a of the extending portion 30 of the insulators 15A and 15B and the axial end surface 19 of the tooth portion 13 is extended. It is larger than the gap d1 in the core axial direction Ax between the tip portion 30b of the projecting portion 30 and the shaft end surface 19 . Therefore, when a load due to tightening of the coil conductor 16 is applied to the extension 30 when the coil conductor 16 is wound, the extension 30 is largely flexurally deformed from the base region 30a to the tip 30b. The tip end portion 30b of the tooth portion 13 reliably contacts or approaches the corner portion (end portion 25) of the axial end surface 19 of the tooth portion 13. As shown in FIG.
Therefore, when this configuration is adopted, it is possible to prevent the coil conductor 16 from directly contacting the corners of the teeth 13 while preventing the formation of gaps between the coil conductor 16 and the side surfaces 20 of the teeth 13 . can be suppressed more reliably.

Further, in the stator 10 (rotary electric machine 1) of the present embodiment, the insulators 15A and 15B are provided with leg portions 29 that contact the shaft end surfaces 19 of the tooth portions 13 in the central region in the core circumferential direction C. As shown in FIG. Therefore, when the leg portions 29 of the central regions of the insulators 15A and 15B in the core circumferential direction C come into contact with the axial end surfaces 19 of the tooth portions 13, the coil conductor 16 extends around the leg portions 29 when wound. The distal end portion 30b of the projecting portion 30 is more reliably flexurally deformed toward the corner portion (end portion 25) of the shaft end surface 19 of the tooth portion 13. As shown in FIG.
Therefore, even when this configuration is adopted, it is possible to prevent the coil conductor 16 from directly contacting the corners of the teeth 13, while preventing the formation of gaps between the coil conductor 16 and the side surfaces 20 of the teeth 13. can be suppressed more reliably.

In the stator 10 (rotating electric machine 1) of the present embodiment, protrusions 41 are provided on the outer flanges 40fo of the insulators 15A and 15B to be fitted into the locking grooves 42 on the split core 14a side. Therefore, by fitting the protrusions 41 of the outer flanges 40fo on the side of the insulators 15A and 15B into the locking grooves 42 on the side of the split core 14a (core body portion 12), the teeth covering portions of the insulators 15A and 15B with respect to the teeth portions 13 39 can be suppressed.
In addition, in the stator 10 (rotating electric machine 1) of the present embodiment, the locking groove 42 in which the protrusion 41 of the outer flange 40fo is fitted is located on the side of the split core 14a (core body portion 12) on which the coil conductor 16 is not wound. Since it is provided on the inner peripheral surface of the back yoke portion 18, the formation of the locking groove 42 does not adversely affect the space factor of the coil conductors.

Further, in the stator 10 (rotary electric machine 1) of the present embodiment, the extension portions 30 of the insulators 15A and 15B are formed with deflection allowance grooves 35 extending along the core radial direction R. As shown in FIG. Therefore, the bending deformation of the extending portion 30 due to the winding of the coil wire 16 is facilitated by the bending allowance groove 35 extending along the core radial direction R, and the distal end portion 30 b of the extending portion 30 becomes closer to the tooth portion 13 than the tooth portion 13 . The corners of the shaft end face 19 of the shaft are reliably brought into contact with or close to each other.
Therefore, when this configuration is adopted, it is possible to prevent the coil conductor 16 from directly contacting the corners of the teeth 13 while preventing the formation of gaps between the coil conductor 16 and the side surfaces 20 of the teeth 13 . can be suppressed more reliably.

Furthermore, the stator 10 (rotary electric machine 1) of the present embodiment has a core circumferential direction C between the extending portions 30 and the outer flanges 40fo of the insulators 15A and 15B and between the extending portions 30 and the inner flanges 40fi. A slit 38 extending therealong is formed in each. Therefore, the flexural deformation of the extending portions 30 of the insulators 15A and 15B when the coil conductor 16 is wound is less likely to be hindered by the outer flanges 40fo and the inner flanges 40fi, and the distal end portions 30b of the extending portions 30 are located on the tooth portions 13. The corners of the shaft end surface 19 are reliably brought into contact with or close to each other.
Therefore, even when this configuration is adopted, it is possible to prevent the coil conductor 16 from directly contacting the corners of the teeth 13, while preventing the formation of gaps between the coil conductor 16 and the side surfaces 20 of the teeth 13. can be suppressed more reliably.

<Other embodiments>
FIG. 8 is a cross-sectional view similar to FIG. 6 of a stator (winding block) of another embodiment. In addition, in FIG. 8, the common code|symbol is attached|subjected to the same part as said embodiment.
Insulators 115A and 115B employed in the stator of the present embodiment, as in the above-described embodiment, are arranged such that the extension portion 130 and the axial end portion of the insulators 115A and 115B are separated from each other before the coil conductor 16 is wound around the outside of the insulators 115A and 115B. A gap d1 is formed between the surfaces 19 in the core axial direction Ax, and the tip portion 130a of the extending portion 130 protrudes outward from the end portion 25 (corner portion) of the shaft end surface 19. As shown in FIG. However, in the case of the present embodiment, the gap d1 in the core axial direction Ax between the portion extending from the base region 130a to the tip portion 130b of the extending portion 130 and the shaft end surface 19 is substantially constant. Strictly speaking, in the case of the present embodiment, the gap d1 in the core axial direction Ax between the extending portion 130 and the axial end surface 19 gradually increases toward the end in the vicinity of the tip portion 130b.

Also in the case of this embodiment, since the basic configuration is almost the same as that of the above-described embodiment, it is possible to obtain the same basic effect as that of the above-described embodiment. The structure of the insulator of the present embodiment can be appropriately adopted according to the easiness of elastic deformation due to the material and size of the insulator.

The present invention is not limited to the above-described embodiments, and various design changes are possible without departing from the gist of the present invention.
For example, in the above embodiment, a split core type stator core is used, but the stator core is not limited to the split core type, and it is also possible to adopt an annular integral structure.

REFERENCE SIGNS LIST 1 rotating electric machine 10 stator 11 rotor 12 core body 13 teeth 14 stator core 15A, 15B, 115A, 115B insulator 16 coil wire 19 shaft end face 20 side face 25 end (corner) part)
29 Leg 30 Extension 30a Base region 30b Tip 35 Deflection allowance groove 38 Slit 39 Teeth cover 40fo Outer flange 40fi Inner flange 41 Projection (positioning projection)
42 ... Locking groove (locking portion)
Ax...Axial direction of core C...Circumferential direction of core R...Radial direction of core d1, d2...Gap

Claims (7)

a stator core in which a plurality of tooth portions having a substantially rectangular cross section protrude radially inward from an annular core main body;
a pair of insulators that respectively cover two axial end surfaces facing the core axial direction among the side surfaces of each of the teeth portions around the protruding direction;
a coil conductor wound around each of the teeth via the pair of insulators,
Before the coil conductor is wound, each of the insulators has a tip portion with a gap in the core axial direction with respect to the end portion of the axial end surface of the tooth portion in the core circumferential direction. is provided with an extension portion extending outward in the core circumferential direction from the end portion. The extending portion includes a base region in a region overlapping the shaft end face in the core circumferential direction, the gap between the shaft end face and the core axial direction being larger than the gap at the tip end. The stator according to claim 1, characterized in that: 3. The stator according to claim 1, wherein the insulator includes a leg portion contacting the shaft end surface in a central region in the core circumferential direction. The insulator is
a tooth covering portion that covers the shaft end surface of the tooth portion;
an outer flange that is provided on the outer side of the tooth cover portion in the core radial direction and regulates the winding position of the coil conductor,
4. The apparatus according to any one of claims 1 to 3, characterized in that the outer flange is provided with a positioning projection that is fitted into a locking portion provided on the inner peripheral surface of the core body portion. stated status. The stator according to any one of claims 1 to 4, wherein the extending portion is provided with a deflection allowance groove extending along the core radial direction. The insulator is
a tooth covering portion that covers the shaft end surface of the tooth portion;
an outer flange provided outside the tooth covering portion in the core radial direction to regulate the winding position of the coil conductor;
an inner flange that is provided radially inward of the tooth covering portion in the core radial direction and regulates the winding position of the coil conductor;
Slits extending along the circumferential direction of the core are provided between the extending portion and the outer flange and between the extending portion and the inner flange. A stator according to any one of the preceding claims. a stator;
a rotor rotatably disposed radially inward of the stator, wherein
The stator is
a stator core in which a plurality of tooth portions having a substantially rectangular cross section protrude radially inward from an annular core main body;
a pair of insulators that respectively cover two axial end surfaces facing the core axial direction among the side surfaces of each of the teeth portions around the protruding direction;
a coil conductor wound around each of the teeth via the pair of insulators,
Before the coil conductor is wound, each of the insulators has a tip portion with a gap in the core axial direction with respect to the end portion of the axial end surface of the tooth portion in the core circumferential direction. is provided with an extending portion extending outward in the core circumferential direction from the end portion.

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