JP2023150104A - stator - Google Patents

Abstract

To provide a stator capable of providing an insulation resin member so as to integrally cover a plurality of bonding parts of segment conductors provided to a coil end part while suppressing deterioration of a cooling performance of a part converted with the insulation resin member of the coil end.SOLUTION: A stator 100 comprises: a coil 20 that includes a plurality of segment conductors 21, and to which a plurality of bonding parts 22 of both segment conductors 21 is provided to a coil end part 21b; and an insulation resin member 30 that integrally covers the plurality of bonding parts 22. Then, a groove-like concave part 31 is formed on a front surface of the insulation resin member 30. Also, the groove-like concave part 31 contains: a wall surface groove-like concave part 31a that is formed so as to be extended to at least one of a wall surface 30s of an outer side (a R2 side) of a radial direction (R direction) of the insulation resin member 30 and a wall surface 30b of an inner side (R1 side) of the radial direction (R direction); and a radial direction groove-like concave part 31b that is extended along the radial direction (R direction) in a wall surface 30c of the outer side of a shaft direction (Z direction) of the insulation resin member 30.SELECTED DRAWING: Figure 4

Description

The present invention relates to a stator.

Conventionally, a stator is known that includes a coil in which a plurality of joints between segment conductors are provided at the coil end, and an insulating resin member that integrally covers the plurality of joints (for example, see Patent Document 1). .

Patent Document 1 discloses a stator that includes a stator core, a coil including a plurality of segment conductors and provided with a plurality of joints between the segment conductors, and an insulating resin member that integrally covers the plurality of joints. has been done. In the stator described in Patent Document 1, the plurality of joints are provided in a coil end portion axially outer than the axial end surface of the stator core so as to be lined up at least along the radial direction of the stator core. There is. Further, the insulating resin member is provided so as to integrally cover the plurality of joints from the innermost end in the radial direction to the outermost end in the radial direction of the plurality of joints. Note that the insulating resin member is molded by immersing the coil end portion in a liquid resin material stored in a mold groove of a mold, curing the resin material, and then removing the mold.

JP2019-68494A

However, in the stator described in Patent Document 1, the insulating resin member is provided so as to integrally cover the plurality of joints provided in the coil end portion, so the insulating resin member of the coil end portion Cooling oil for cooling a coil such as an ATF (Automatic Transmission Fluid) used in an AT (Automatic Transmission) of a vehicle is not directly supplied to the covered portion. That is, the portion of the coil end portion covered with the insulating resin member has lower cooling performance with the cooling oil than the portion not covered with the insulating resin member. In addition, in the stator described in Patent Document 1, the coil end portion is immersed in a liquid resin material stored in a mold groove of a mold to harden the resin material, and then the mold is removed. Since it is molded, the surface of the insulating resin member is considered to be relatively flat. For this reason, the multiple joints between the segment conductors provided at the coil end can be integrated while suppressing the deterioration of the cooling performance due to the cooling oil in the part of the coil end covered with the insulating resin member. A stator that can be provided with an insulating resin member so as to cover the stator is desired.

This invention has been made to solve the above-mentioned problems, and one object of the invention is to reduce the cooling performance of the portion of the coil end covered with the insulating resin member by the cooling oil. It is an object of the present invention to provide a stator in which an insulating resin member can be provided so as to integrally cover a plurality of joint parts between segment conductors provided at a coil end part while suppressing the damage.

In order to achieve the above object, a stator according to one aspect of the present invention includes a stator core and a plurality of segment conductors, and the segment conductor is provided at a coil end portion axially outer than an axial end surface of the stator core. A plurality of coils are provided such that a plurality of joints are arranged along at least the radial direction of the stator core, and a plurality of joints are provided from the outermost end in the radial direction to the innermost end in the radial direction in the plurality of joints. an insulating resin member that integrally covers the insulating resin member, and a groove-like recess is formed on the surface of the insulating resin member, and the groove-like recess is formed on a radially outer wall surface and a radially inner wall surface of the insulating resin member. At least one of the wall surfaces includes a wall groove-like recess that extends in the axial direction, and an axially outer wall surface of the insulating resin member includes a radial groove-like recess that extends in the radial direction.

In the stator according to one aspect of the present invention, as described above, groove-like recesses are formed on the surface of the insulating resin member. As a result, the surface area of the insulating resin member can be increased compared to the case where groove-like recesses are not formed on the surface of the insulating resin member (when the surface of the insulating resin member is relatively flat), and the surface area of the insulating resin member can be increased. The portion where the thickness of the resin member is reduced can be increased. In other words, when cooling oil such as ATF is supplied to an insulating resin member, the surface area (cooling area) of the insulating resin member increases, and the thickness of the insulating resin member (cooling oil during cooling and coil end portion The cooling performance of the portion of the coil end portion covered with the insulating resin member by the cooling oil can be improved by increasing the portion where the distance from the coil end portion is smaller. As a result, the multiple joints between the segment conductors provided at the coil end can be integrated while suppressing the deterioration of cooling performance due to cooling oil in the part of the coil end covered with the insulating resin member. An insulating resin member can be provided to cover the area. Further, in the stator according to the first aspect, as described above, the groove-like recess is a wall groove-like recess extending in the axial direction in at least one of the radially outer wall surface and the radially inner wall surface of the insulating resin member. and a radial groove-like recess extending in the radial direction on the axially outer wall surface of the insulating resin member. Thereby, it is possible to improve the cooling performance of the portion covered by the insulating resin member on at least one of the radially outer side and the radially inner side of the coil end portion and the axially outer side thereof by the cooling oil. As a result, compared to the case where the groove-shaped recess includes only one of the wall groove-shaped recess and the radial groove-shaped recess, the cooling performance of the portion of the coil end portion covered with the insulating resin member is reduced. can be further suppressed.

According to the present invention, as described above, the segment conductors provided in the coil end portion can be connected to each other while suppressing a decrease in the cooling performance due to the cooling oil in the portion of the coil end portion covered with the insulating resin member. It is possible to provide a stator in which an insulating resin member can be provided so as to integrally cover a plurality of joint portions of the stator.

FIG. 2 is a perspective view of a stator according to an embodiment of the invention. FIG. 2 is a perspective view showing a stator core and coils of a stator according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view showing a coil end portion of a stator coil according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view of an insulating resin member of a stator according to an embodiment of the present invention, viewed from the outside in the radial direction. FIG. 3 is an enlarged perspective view showing the correspondence between the coil end portion of the stator and the insulating resin member according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view of an insulating resin member of a stator according to an embodiment of the present invention, viewed from the inside in the radial direction. FIG. 2 is a plan view of a stator according to an embodiment of the invention.

Embodiments of the present invention will be described below based on the drawings.

The configuration of a stator 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

In the following description, the axial direction, radial direction, and circumferential direction of stator core 10 included in stator 100 are referred to as Z direction, R direction, and C direction, respectively. Further, one side and the other side in the axial direction (Z direction) are respectively referred to as a Z1 side and a Z2 side. Further, the inner side (inner diameter side) and the outer side (outer diameter side) in the radial direction (R direction) are defined as the R1 side and the R2 side, respectively.

(Overall configuration of stator)
As shown in FIG. 1, the stator 100 constitutes a part of an inner rotor type rotating electric machine (not shown) together with a rotor (not shown) arranged on the R1 side of the stator 100 so as to face the stator 100. . The rotating electrical machine is, for example, a motor, a generator, or a motor/generator.

Stator 100 includes a stator core 10, a coil 20, and an insulating resin member 30.

The stator core 10 has a cylindrical shape whose central axis is a central axis (not shown) along the Z direction. The stator core 10 is formed by laminating a plurality of electromagnetic steel plates (for example, silicon steel plates) in the Z direction.

As shown in FIG. 2, the stator core 10 includes an annular back yoke 11 and a plurality of teeth 12 protruding from the back yoke 11 toward the R1 side. A slot 13 is formed between each of the teeth 12 adjacent to each other in the C direction.

Coil 20 includes a plurality of segment conductors 21. The coil 20 is constructed by joining a plurality of segment conductors 21. Each of the plurality of segment conductors 21 is made of copper wire. Each of the plurality of segment conductors 21 is made of a rectangular conducting wire. The coil 20 is configured to generate magnetic flux when three-phase AC power is supplied from a power source (not shown).

Each of the plurality of segment conductors 21 includes a plurality of slot accommodating portions 21a accommodated in each of the plurality of slots 13, and a plurality of coil end portions 21b connecting the slot accommodating portions 21a accommodated in mutually different slots 13. ,including. The coil end portion 21b is arranged on the outer side in the axial direction (Z direction) than the end surface 10a of the stator core 10 in the axial direction (Z direction). As shown in FIG. 3, each of the plurality of coil end portions 21b is arranged to extend diagonally with respect to the Z direction.

A plurality of joint portions 22 between the segment conductors 21 are provided in the coil end portion 21b. The plurality of joint parts 22 are arranged at the outermost part in the Z direction of the coil end part 21b. The plurality of joints 22 are provided so as to be lined up at least along the radial direction (R direction) of the stator core 10. Specifically, a plurality of joint portions 22 arranged along the R direction are provided in plural sets so as to be arranged in the circumferential direction (C direction) of the stator core 10 over the entire circumference of the coil end portion 21b. Note that, as shown in FIG. 2, the plurality of joints 22 are arranged in the coil end part 21b on the Z1 side, and are not arranged in the coil end part 21b on the Z2 side.

As shown in FIG. 3, the insulating resin member 30 has a plurality of joints 22 extending from the outermost end 22a in the radial direction (R direction) to the innermost end 22b in the radial direction (R direction). 22 is provided so as to integrally cover it. Note that the outermost end 22a in the radial direction (R direction) and the innermost end 22b in the radial direction (R direction) of the plurality of joints 22 are the outermost ends 22a and 22b of the plurality of joints 22 arranged in the R direction. The joint portion 22 is provided closest to the R2 side, and the joint portion 22 is provided closest to the R1 side. This simplifies the work process for covering the plurality of joints 22 when manufacturing the stator 100, compared to the case where the insulating resin member 30 is provided to cover each of the plurality of joints 22 individually. can do.

The insulating resin member 30 is formed in an annular shape so as to integrally cover a plurality of sets of joint portions 22 arranged in the circumferential direction (direction C). The insulating resin member 30 covers all of the plurality of joints 22 at the outer part in the Z direction where the plurality of joints 22 of the coil end part 21b are arranged (the part on the opposite side from the stator core 10). However, the portion of the coil end portion 21b on the stator core 10 side is not covered. Note that the insulating resin member 30 is arranged closer to the Z1 side than the stator core 10 so as to cover the coil end portion 21b on the Z1 side. The insulating resin member 30 includes, for example, a thermosetting epoxy resin material and an ultraviolet curable acrylic resin material.

(Detailed configuration of insulating resin member)
As shown in FIG. 4, a groove-like recess 31 is formed on the surface of the insulating resin member 30. As shown in FIG. As a result, the surface area of the insulating resin member 30 can be increased compared to the case where the groove-shaped recesses 31 are not formed on the surface of the insulating resin member 30 (when the surface of the insulating resin member 30 is flat). , the portion where the thickness of the insulating resin member 30 is reduced can be increased. That is, when cooling oil such as ATF is supplied to the insulating resin member 30, the surface area (cooling area) of the insulating resin member 30 increases and the thickness of the insulating resin member 30 (cooling oil and The cooling performance of the portion of the coil end portion 21b covered with the insulating resin member 30 by the cooling oil can be improved by an increase in the portion where the distance from the coil end portion 21b is reduced. As a result, the plurality of connections between the segment conductors 21 provided in the coil end portion 21b are suppressed from deteriorating the cooling performance due to the cooling oil in the portion of the coil end portion 21b covered with the insulating resin member 30. An insulating resin member 30 can be provided to integrally cover the portion 22.

The groove-shaped recess 31 is formed at at least one of a wall surface 30a on the outer side (R2 side) in the radial direction (R direction) and a wall surface 30b on the inner side (R1 side) in the radial direction (R direction) (see FIG. 1). , a wall groove-like recess 31a extending in the axial direction (Z direction), and a radial groove-like recess extending in the radial direction (R direction) on the outer wall surface 30c of the insulating resin member 30 in the axial direction (Z direction). 31b. As a result, the insulating resin member 30 is disposed on at least one of the outer side (R2 side) and the inner side (R1 side) in the radial direction (R direction) and the outer side in the axial direction (Z direction) of the coil end portion 21b. The cooling performance of the area covered by the cooling oil can be improved. As a result, compared to the case where the groove-like recess 31 includes only one of the wall-surface groove-like recess 31a and the radial groove-like recess 31b, the portion of the coil end portion 21b covered with the insulating resin member 30 is cooled. It is possible to further suppress the decline in performance. Note that, as will be described later, in the stator 100, the wall groove-like recesses 31a are formed on both the R2 side wall surface 30a and the R1 side wall surface 30b of the insulating resin member 30.

The wall groove-like recess 31a is formed in at least one of a wall surface 30a on the outer side (R2 side) in the radial direction (R direction) and a wall surface 30b on the inner side (R1 side) in the radial direction (R direction). It is formed to extend diagonally with respect to the Z direction. Specifically, the wall groove-like recess 31a is formed to extend obliquely to the Z direction at substantially the same angle as the angle at which the coil end portion 21b is inclined to the Z direction.

Thereby, the length of the wall groove-like recess 31a can be increased compared to the case where the wall groove-like recess 31a extends in the axial direction (Z direction). As a result, the surface area (cooling area) of the insulating resin member 30 can be made larger and the thickness of the insulating resin member 30 can be increased compared to the case where the wall groove-like recess 31a extends in the axial direction (Z direction). Since the portion where the distance (distance between the cooling oil and the coil end portion 21b during cooling) becomes small can be further increased, the portion of the coil end portion 21b covered with the insulating resin member 30 can be cooled by the cooling oil. You can further improve your sexual performance.

The wall groove-like recess 31a is formed along the shape of the gap 41 between the coil end portions 21b adjacent to each other in the circumferential direction (C direction). Specifically, as shown in FIG. 3, a gap 41 in the Z direction is formed between the coil end portions 21b. As shown in FIG. 5, the wall groove-like recess 31a is formed in a portion corresponding to the gap 41 so as to follow the shape of the gap 41.

As a result, the outline of the wall groove-like recess 31a corresponds to the outline of the coil end portion 21b near the wall groove-like recess 31a, so that the wall groove-like recess 31a and the wall groove-like recess 31a of the insulating resin member 30 The thickness of the entire portion near the recessed portion 31a (distance between the cooling oil and the coil end portion 21b during cooling) can be made uniform. As a result, compared to the case where the wall groove-like recess 31a is not formed along the shape of the gap 41, the entire wall groove-like recess 31a and the portion near the wall groove-like recess 31a of the insulating resin member 30 It is possible to suppress unevenness in the cooling performance caused by the cooling oil.

As shown in FIG. 1, the wall groove-like recess 31a includes a wall surface 30a on the outside (R2 side) in the radial direction (R direction) and an inside (R2 side) in the radial direction (R direction) of the insulating resin member 30 formed in an annular shape. A plurality of insulating resin members 30 are formed at predetermined intervals on at least one of the wall surfaces 30b (R1 side) over the entire circumference of the insulating resin member 30. Specifically, the wall groove-like recess 31a formed in the wall surface 30b on the R1 side of the insulating resin member 30 extends over the entire circumference of the insulating resin member 30, and the wall groove-like recess 31a forms the wall surface 30b of the R1 side coil end portion 21b (see FIG. 2). A plurality of them are formed at intervals corresponding to the interval. Although a plurality of wall groove-like recesses 31a formed in the wall surface 30a on the R2 side of the insulating resin member 30 are formed at intervals corresponding to the intervals between the coil end portions 21b on the R2 side, the coil 20 It is not formed in a portion 32 (see FIG. 2) where a power line 23 for electrically connecting the power line 23 to other electrical equipment is provided. That is, the wall groove-like recess 31a formed in the R2 side wall surface 30a of the insulating resin member 30 is formed only in a portion in the C direction.

As a result, the wall groove-like recess 31a is formed on at least one of the wall surface 30a on the outer side (R2 side) in the radial direction (R direction) and the inner wall surface 30b (on the R1 side) in the radial direction (R direction). , the length of the entire groove-like recess 31 can be increased compared to the case where the groove-like recess 31 is not formed all around the insulating resin member 30. As a result, the wall groove-like recess 31a is formed on at least one of the radially (R direction) outer (R2 side) wall surface and the radially (R direction) inner (R1 side) wall surface 30b of the insulating resin member 30. The surface area (cooling area) of the insulating resin member 30 can be made larger, and the thickness of the insulating resin member 30 (when cooling Since it is possible to further increase the portion where the distance (distance between the cooling oil and the coil end portion 21b) is small, the cooling performance of the portion of the coil end portion 21b covered with the insulating resin member 30 by the cooling oil is further improved. be able to.

As shown in FIG. 4, the radial groove-like recess 31b extends in the radial direction (R direction) so as to be connected to the wall groove-like recess 31a. Specifically, as shown in FIG. 3, joint portions 22 adjacent to each other in the C direction are spaced apart from each other in the C direction. Further, a plurality of two joint portions 22 spaced apart from each other in the C direction are lined up in the R direction. As a result, the spaces between the joint portions 22 adjacent in the C direction are continuous in the R direction, thereby forming valley portions 42 extending in the R direction. As shown in FIG. 5, the radial groove-like recess 31b is formed in a portion corresponding to the trough 42 so as to follow the shape of the trough 42. As will be described later, the radial groove-like recess 31b is formed in the wall groove-like recess 31a formed in the R2-side wall surface 30a of the insulating resin member 30 and in the R1-side wall surface 30b of the insulating resin member 30. It is connected to both of the wall groove-like recesses 31a. Note that, as shown in FIG. 1, the radial groove-like recess 31b is formed over the entire circumference of the insulating resin member 30.

As a result, the radial groove-like recess 31b is formed in the radial direction (R direction) from the outer end (R2 side) in the radial direction (R direction) on the outer wall surface 30c of the insulating resin member 30 in the axial direction (Z direction). The length of the radial groove-like recess 31b can be made relatively large. As a result, the radial groove-like recess 31b is formed in the axial direction (Z direction) outer wall surface 30c of the insulating resin member 30 from the radial direction (R direction) outer (R2 side) end to the radial direction (R direction). The surface area (cooling area) of the insulating resin member 30 can be made larger, and the thickness of the insulating resin member 30 (when cooling Since it is possible to further increase the portion where the distance (distance between the cooling oil and the coil end portion 21b) is small, the cooling performance of the portion of the coil end portion 21b covered with the insulating resin member 30 by the cooling oil is further improved. be able to.

As shown in FIGS. 4 and 6, the wall groove-like recess 31a has a wall surface 30a on the outside (R2 side) in the radial direction (R direction) and the inside (R1 side) in the radial direction (R direction) of the insulating resin member 30. It is formed on both of the wall surfaces 30b. The radial groove-like recess 31b includes a wall groove-like recess 31a formed in the outer (R2 side) wall surface 30a of the insulating resin member 30 in the radial direction (R direction), and a wall groove-like recess 31a formed in the outer (R2 side) wall surface 30a of the insulating resin member 30 in the radial direction (R direction). It is formed to extend in the radial direction (R direction) so as to be connected to both of the wall groove-like recesses 31a formed on the inner (R1 side) wall surface 30b (R direction).

As a result, the wall groove-like recess 31a is formed only on one of the wall surface 30a on the outside (R2 side) in the radial direction (R direction) of the insulating resin member 30 or the wall surface 30b on the inside (R1 side) in the radial direction (R direction). The length of the groove-like recess 31 as a whole can be increased compared to the case where the groove-like recess 31 is provided. As a result, the wall groove-like recess 31a is formed only on one of the wall surface 30a on the outside (R2 side) in the radial direction (R direction) of the insulating resin member 30 or the wall surface 30b on the inside (R1 side) in the radial direction (R direction). The surface area (cooling area) of the insulating resin member 30 can be made larger, and the thickness of the insulating resin member 30 (distance between the cooling oil and the coil end portion 21b during cooling) can be increased compared to the case where the insulating resin member 30 is Since it is possible to further increase the portion where the value is small, it is possible to further improve the cooling performance of the portion of the coil end portion 21b covered with the insulating resin member 30 by the cooling oil.

As shown in FIG. 4, the groove-like recess 31 extends in the circumferential direction (C direction) on the outer wall surface 30c of the insulating resin member 30 in the axial direction (Z direction) so as to intersect with the radial groove recess 31b. It includes a circumferential groove-like recess 31c formed as shown in FIG. Specifically, as shown in FIG. 3, joint portions 22 adjacent to each other in the R direction are spaced apart from each other in the R direction. Further, a plurality of two joint portions 22 spaced apart from each other in the C direction are arranged in the C direction. As a result, the spaces between the joint portions 22 adjacent to each other in the R direction are continuous in the C direction, thereby forming valley portions 43 extending in the C direction. As shown in FIG. 5, the circumferential groove-like recess 31c is formed in a portion corresponding to the trough 43 so as to follow the shape of the trough 43. The circumferential groove-like recess 31c is formed to extend in the C direction so as to be substantially perpendicular to the radial groove-like recess 31b. Note that, as shown in FIG. 7, the circumferential groove-like recess 31c is formed over the entire circumference of the insulating resin member 30.

Thereby, the length of the entire groove-like recess 31 can be increased compared to the case where the groove-like recess 31 does not include the circumferential groove-like recess 31c. As a result, the surface area (cooling area) of the insulating resin member 30 can be made larger, and the thickness of the insulating resin member 30 ( Since the distance between the cooling oil and the coil end portion 21b during cooling can be increased, the cooling performance of the portion of the coil end portion 21b covered with the insulating resin member 30 by the cooling oil can be increased. It can be further improved.

(Method for manufacturing insulating resin members)
With the coil 20 disposed in the stator core 10, the coil end portion 21b is immersed in a liquid resin material stored in a liquid tank. Then, before the liquid resin material is cured, the coil end portion 21b is taken out from the liquid tank. Then, the insulating resin member 30 is formed by curing the resin material. Thereby, the groove-like recess 31 can be formed along the shape of the coil end portion 21b by appropriately adjusting the viscosity and temperature of the resin material.

[Modified example]
Note that the embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and further includes all changes (modifications) within the meaning and range equivalent to the claims.

For example, in the embodiment described above, the wall groove-like recess 31a includes the wall surface 30a on the outer side (R2 side) in the radial direction (R direction) and the wall surface 30b on the inner side (R1 side) in the radial direction (R direction). Although an example has been shown in which a plurality of insulating resin members 30 are formed at predetermined intervals over the entire circumference of the insulating resin member 30, the present invention is not limited to this. In the present invention, a plurality of wall groove-like recesses are formed at predetermined intervals on at least one of the radially outer wall surface and the radially inner wall surface of the insulating resin member, and only in a portion in the circumferential direction of the insulating resin member. may have been done. Further, a plurality of wall groove-like recesses may be formed at random intervals on at least one of the radially outer wall surface and the radially inner wall surface of the insulating resin member.

Further, in the above embodiment, an example was shown in which the circumferential groove-like recess 31c is formed over the entire circumference of the insulating resin member 30, but the present invention is not limited to this. In the present invention, the circumferential groove-like recess may be formed only in a part of the circumferential direction of the insulating resin member.

Further, in the above embodiment, an example was shown in which the radial groove-like recess 31b is formed over the entire circumference of the insulating resin member 30, but the present invention is not limited to this. In the present invention, the radial groove-like recess may be formed only in a part of the circumferential direction of the insulating resin member.

Further, in the above embodiment, an example was shown in which the wall groove-like recess 31a is formed along the shape of the gap 41 between the coil end portions 21b adjacent to each other in the circumferential direction (direction C). Not limited to. In the present invention, the wall groove-like recess may be formed so as not to follow the shape of the gap between circumferentially adjacent coil end portions.

Further, in the above embodiment, an example was shown in which the circumferential groove-like recess 31c is formed to intersect with the radial groove-like recess 31b, but the present invention is not limited to this. In the present invention, the circumferential groove-like recess may be formed so as not to intersect with the radial groove-like recess.

Further, in the above embodiment, the groove-shaped recess 31 is a circumferential groove-shaped recess 31c formed to extend in the circumferential direction (C direction) on the outer wall surface 30c of the insulating resin member 30 in the axial direction (Z direction). Although an example is shown in which the configuration is configured to include the above, the present invention is not limited thereto. In the present invention, the groove-like recess may be configured not to include a circumferential groove-like recess formed to extend in the circumferential direction on the axially outer end surface of the insulating resin member.

Further, in the above embodiment, the radial groove-like recess 31b is formed in the wall surface 30a of the insulating resin member 30 on the outer side (R2 side) in the radial direction (R direction), and the wall surface groove-like recess 31a formed in the radial direction (R direction) Although the example is shown in which the groove is formed to extend in the radial direction (R direction) so as to be connected to both of the wall groove-like recesses 31a formed on the inner (R1 side) wall surface 30b, The present invention is not limited to this. In the present invention, the radial groove-like recess is connected to only one of the wall groove-like recess formed on the radially outer wall surface of the insulating resin member or the wall groove-like recess formed on the radially inner wall surface of the insulating resin member. You can leave it there. Furthermore, the radial groove-like recess is not connected to both the wall groove-like recess formed on the radially outer wall surface of the insulating resin member and the wall groove-like recess formed on the radially inner wall surface of the insulating resin member. Good too.

Further, in the above embodiment, the wall groove-like recess 31a includes the wall surface 30a on the outside (R2 side) in the radial direction (R direction) of the insulating resin member 30 and the wall surface 30b on the inside (R1 side) in the radial direction (R direction). Although the present invention is not limited to this example, the present invention is not limited to this example. In the present invention, the wall groove-like recess may be formed only on one of the radially outer wall surface and the radially inner wall surface of the insulating resin portion.

Further, in the above embodiment, an example is shown in which the radial groove-like recess 31b is formed to follow the shape of the valley 42 formed between the joints 22 adjacent to each other in the circumferential direction (C direction). However, the present invention is not limited to this. In the present invention, the radial groove-like recess may be formed so as not to follow the shape of the trough formed between the circumferentially adjacent joint parts.

Further, in the above embodiment, the wall groove-like recess 31a includes the wall surface 30a on the outside (R2 side) in the radial direction (R direction) of the insulating resin member 30 and the wall surface 30b on the inside (R1 side) in the radial direction (R direction). Although an example has been shown in which at least one of the two is formed to extend diagonally with respect to the axial direction (Z direction), the present invention is not limited to this. In the present invention, the wall groove-like recess may be formed to extend substantially parallel to the axial direction on at least one of the radially outer wall surface and the radially inner wall surface of the insulating resin member.

Further, in the above embodiment, the plurality of joints 22 between the segment conductors 21 are arranged in the coil end part 21b on the Z1 side (one side in the axial direction), and are arranged on the coil end part 21b on the Z2 side. Although the present invention is not limited to this example, the present invention is not limited to this example. In the present invention, the plurality of joints between the segment conductors may be arranged at both the coil end portion on one side in the axial direction and the coil end portion on the other side in the axial direction. In that case, the insulating resin member is arranged on one side of the stator core in the axial direction so as to integrally cover the plurality of joints arranged in the coil end part on one side in the axial direction, and It may be arranged on one side of the stator core in the axial direction so as to integrally cover a plurality of joints arranged on the other coil end.

Further, in the above embodiment, an example was shown in which the insulating resin member 30 is formed in an annular shape so as to integrally cover a plurality of sets of joint parts 22 arranged in the circumferential direction (C direction). It is not limited to this. In the present invention, the insulating resin member may be formed in an arc shape (a part of the stator core in the circumferential direction) so as to integrally cover a plurality of sets of joints arranged in the circumferential direction. Further, the insulating resin member may be formed so as to integrally cover a pair of joint portions arranged in the radial direction.

DESCRIPTION OF SYMBOLS 10... Stator core, 10a... End face (in the axial direction of the stator core), 20... Coil, 1... Segment conductor, 21b... Coil end part, 22... Joint part, 22a... Outermost end (in the radial direction of a plurality of joint parts) , 22b...(radially innermost end of the plurality of joints), 30...insulating resin member, 30a...(radially outer side of the insulating resin member) wall surface, 30b...(radially inner side of the insulating resin member) ) Wall surface, 30c...Wall surface (outside in the axial direction of the insulating resin member), 31...Groove-shaped recess, 31a...Wall groove-like recess, 31b...Radial groove-like recess, 31c...Circumferential groove-like recess, 41...( Gap (between circumferentially adjacent coil end parts), 42...trough (formed between circumferentially adjacent joint parts), 100... stator

Claims (8)

stator core and
A plurality of segment conductors are included, and joints between the segment conductors provided at a coil end portion axially outer than an axial end face of the stator core are aligned at least along a radial direction of the stator core. A plurality of coils,
an insulating resin member integrally covering the plurality of joints from the outermost end in the radial direction to the innermost end in the radial direction of the plurality of joints,
A groove-like recess is formed on the surface of the insulating resin member,
The groove-like recess includes a wall groove-like recess extending in the axial direction on at least one of the radially outer wall surface and the radially inner wall surface of the insulating resin member, and a wall groove-like recess extending in the axial direction of the insulating resin member. a radial groove-like recess extending along the radial direction on an outer wall surface of the stator. A plurality of sets of the plurality of joints arranged along the radial direction are provided so as to be arranged in the circumferential direction of the stator core,
The stator according to claim 1, wherein the insulating resin member is formed in an annular shape or an arc shape so as to integrally cover the plurality of joint portions arranged in the circumferential direction. The wall groove-like recess is formed to extend obliquely with respect to the axial direction on at least one of the radially outer wall surface and the radially inner wall surface of the insulating resin member. A stator according to claim 1 or 2. The stator according to claim 1 or 2, wherein the radial groove-like recess is formed to extend in the radial direction so as to be connected to the wall groove-like recess. The wall groove-like recess is formed on both the radially outer wall surface and the radially inner wall surface of the insulating resin member,
The radial groove-like recess is the wall groove-like recess formed in the radially outer wall surface of the insulating resin member, and the wall groove-like recess formed in the radially inner wall surface of the insulating resin member. The stator according to claim 4, wherein the stator is formed to extend in the radial direction so as to be connected to both of the wall groove-like recesses. The groove-shaped recess is a circumferential groove-shaped recess formed on the outer wall surface of the insulating resin member in the axial direction so as to extend in the circumferential direction of the stator core so as to intersect with the radial groove-shaped recess. A stator according to any one of claims 1 to 5, further comprising. A plurality of sets of the plurality of joints arranged along the radial direction are provided so as to be arranged in the circumferential direction of the stator core,
The insulating resin member is formed in an annular or arc shape so as to integrally cover the plurality of sets of joints arranged in the circumferential direction,
The stator according to any one of claims 1 to 6, wherein the wall groove-like recess is formed along the shape of a gap between the circumferentially adjacent coil end portions. A plurality of sets of the plurality of joints arranged along the radial direction are provided so as to be arranged in the circumferential direction of the stator core,
The insulating resin member is formed in an annular shape so as to integrally cover the plurality of sets of joints arranged in the circumferential direction,
The wall groove-like recess extends over the entire circumference of the insulating resin member on at least one of the radially outer wall surface and the radially inner wall surface of the annularly formed insulating resin member. The stator according to claim 1, wherein a plurality of stators are formed at predetermined intervals.

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