Stator and rotary electrical machine

Abstract

In the present invention, a first insulating sheet has a first coil winding part insulating part which insulates adjacent coil winding parts and a first bent part which is bent toward a first tooth part from an end part of the first coil winding part insulating part in the radial direction of a stator core. A second insulating sheet has a second coil winding part insulating part which insulates adjacent coil winding parts and a second bent part which is bent toward a second tooth part from an end part of the second coil winding part insulating part in the radial direction of the stator core. Adjacent insulation members have a holding part that holds a portion on the first bent part side of the first coil winding part insulating part and a portion on the second bent part side of the second coil winding part insulating part

Description

Stator and Rotating Electric Machine Cross - reference to Related Applications

[0001] This application is based on Japanese Application No. 2024 - 231085 filed on December 26, 2024, claims the benefit of its priority, and all the contents of the patent application are incorporated herein by reference.

[0002] The technology of the present disclosure relates to a stator and a rotating electric machine.

[0003] Conventionally, there is a stator including a stator core having a plurality of radially extending teeth, a plurality of insulating members attached to the plurality of teeth, a plurality of insulating sheets attached to the plurality of teeth, and a plurality of winding winding portions wound around the plurality of teeth via the insulating members and the insulating sheets (see, for example, Japanese Patent No. 5762638).

[0004] In the above - mentioned stator, the plurality of insulating sheets include a first insulating sheet attached to a first tooth portion among adjacent tooth portions and a second insulating sheet attached to a second tooth portion among adjacent tooth portions. The first insulating sheet has a first winding winding portion insulating portion for insulating adjacent winding winding portions and a first bent portion bent from an end portion of the first winding winding portion insulating portion in the radial direction of the stator core to the side of the first tooth portion. The second insulating sheet has a second winding winding portion insulating portion for insulating adjacent winding winding portions and a second bent portion bent from an end portion of the second winding winding portion insulating portion in the radial direction of the stator core to the side of the second tooth portion.

[0005] As a result of the inventor's detailed examination, the following problem was found. Specifically, in the stator described above, if the radius of curvature differs between the corner between the first winding section insulation and the first bent section and between the second winding section insulation and the second bent section, an imbalance occurs between the springback force acting on the first winding section insulation and the springback force acting on the second winding section insulation, which may cause the first and second winding section insulation to deform to one side. In this case, the first and second winding section insulation may come into contact with one of the adjacent winding sections, potentially reducing the heat dissipation of the adjacent winding section.

[0006] The technology disclosed herein provides a stator and a rotating electric machine that can ensure heat dissipation between adjacent winding sections.

[0007] A first aspect of the technology of the present disclosure comprises a stator core having a plurality of radially extending teeth, a plurality of insulating members mounted on the plurality of teeth, a plurality of insulating sheets mounted on the plurality of teeth, and a plurality of winding portions wound around the plurality of teeth via the insulating members and insulating sheets, wherein the plurality of insulating sheets include a first insulating sheet mounted on a first tooth among adjacent teeth, and a second insulating sheet mounted on a second tooth among adjacent teeth, and the first insulating sheet insulates the adjacent winding portions. The stator has a first insulated portion and a first bent portion that is bent from the end of the first insulated portion in the radial direction of the stator core toward the first teeth portion, and the second insulated sheet has a second insulated portion that insulates adjacent insulated portions and a second bent portion that is bent from the end of the second insulated portion in the radial direction of the stator core toward the second teeth portion, and adjacent insulated members have a clamping portion that clamps the portion of the first insulated portion on the side of the first bent portion and the portion of the second insulated portion on the side of the second bent portion.

[0008] A second aspect of the technology of the present disclosure is a rotating electric machine comprising a stator according to the first aspect and a rotor rotatably housed inside the stator.

[0009] The technology of this disclosure provides a stator and a rotating electric machine that can ensure heat dissipation between adjacent winding sections.

[0010] This is a cross-sectional view of a stator according to the first embodiment. This is a cross-sectional view of a stator component according to the first embodiment. This is an exploded perspective view of a stator component according to the first embodiment. This is an enlarged exploded perspective view of the main part of a stator according to the first embodiment. This is an enlarged plan view of the main part of a stator according to the first embodiment. This is an enlarged cross-sectional view of the main part of a stator according to the second embodiment. This is an enlarged cross-sectional view of the main part of a stator according to the third embodiment. This is an enlarged cross-sectional view of the main part of a stator according to the fourth embodiment. This is an enlarged plan view of the main part of a stator according to the first comparative example. This is an enlarged cross-sectional view of the main part of a stator according to the second comparative example.

[0011] [First Embodiment] First, a first embodiment of the technology of this disclosure will be described.

[0012] As shown in Figure 1, the rotating electric machine M comprises a stator 10 and a rotor 11. The stator 10 is formed in an annular shape, and the rotor 11 is rotatably housed inside the stator 10. The stator 10 and rotor 11 constitute an inner rotor type brushless motor.

[0013] In each figure, the X direction indicates the tangential direction of the stator 10, the Y direction indicates the radial direction of the stator 10, and the Z direction indicates the axial direction of the stator 10. The X, Y, and Z directions are mutually orthogonal. In the following explanation, the circumferential direction of the stator 10 refers to the direction around the central axis of the stator 10. The tangential, radial, axial, and circumferential directions of the stator core 24, which will be described later, are the same as the tangential, radial, axial, and circumferential directions of the stator 10, respectively.

[0014] The stator 10 comprises a plurality of stator components 12. The stator 10 is formed by combining the plurality of stator components 12 in a ring shape. Figure 1 shows the configuration of half of the rotating electric machine M, including the stator 10 and rotor 11. The configuration of the stator 10 of the rotating electric machine M will be described in detail below.

[0015] As shown in Figure 2, the core member 14 is formed in a T-shape when viewed from the Z direction and has a teeth portion 20 and a core back portion 22. The core back portion 22 is located on the outside in the Y direction (outside in the radial direction) relative to the teeth portion 20. The core back portion 22 extends on both sides in the X direction relative to the teeth portion 20, and the teeth portion 20 extends from the center of the core back portion 22 in the X direction toward the inside in the Y direction (inside in the radial direction).

[0016] The teeth portion 20 has a main body portion 21A and a tip portion 21B. The main body portion 21A of the teeth portion 20 is the portion between the tip portion 21B and the base portion of the teeth portion 20. The tip portion 21B of the teeth portion 20 is a free end, and the base portion of the teeth portion 20 is connected to the core back portion 22. The tip portion 21B of the teeth portion 20 is located on the opposite side of the core back portion 22 from the main body portion 21A (i.e., on the inside in the Y direction), and its width widens in the X direction relative to the main body portion 21A of the teeth portion 20.

[0017] The stator core 24 (see Figure 1) is formed by combining multiple core members 14 in an annular shape. That is, the stator core 24 is formed by multiple core members 14 divided into tooth portions 20. In the state in which the stator core 24 is formed, the multiple core back portions 22 form an annular portion 26 (see Figure 1), which is the outer circumference of the stator core 24, and the multiple tooth portions 20 extend radially from the center of the stator core 24. The spaces between the multiple tooth portions 20 are formed as slots 28 (see Figure 1).

[0018] The core member 14 is formed symmetrically in the X direction. The following description will mainly focus on the configuration of one side of the core member 14 in the X direction. The main body portion 21A of the teeth portion 20 has a side surface 20A facing the X direction. The side surface 20A extends in the Y and Z directions. The tip portion 21B of the teeth portion 20 has an outward-facing surface 20B facing outward in the Y direction. The outward-facing surface 20B is inclined with respect to the X direction and extends in the Z direction. The core back portion 22 has an inward-facing surface 22A facing inward in the Y direction. The inward-facing surface 22A extends in the X and Z directions.

[0019] As shown in Figures 2 and 3, each stator component 12 comprises a core member 14, an insulator 16, and a winding section 18. Side Z1 indicates one axial side of the stator 10, and side Z2 indicates the other axial side of the stator 10. The insulator 16 has a pair of insulating members 30 and a pair of insulating sheets 40. The insulating members 30 are three-dimensional resin parts formed by resin molding. The insulating sheets 40 are sheet-shaped resin material. The insulating sheets 40 are folded in a three-dimensional manner. Note that the insulating sheets 40 may be insulating paper.

[0020] One of the pair of insulating members 30 is attached to the core member 14 from the Z1 side, and the other insulating member 30 is attached to the core member 14 from the Z2 side. The pair of insulating members 30 are formed symmetrically in the Z direction. Each insulating member 30 is also formed symmetrically in the X direction. The pair of insulating sheets 40 are formed symmetrically in the X direction. Each insulating sheet 40 is also formed symmetrically in the Z direction. The following will mainly describe the configuration of one side in the X direction of the insulating member 30 located on the Z1 side of the pair of insulating members 30. Similarly, the configuration of the Z1 side of the insulating sheet 40 located on one side in the X direction of the pair of insulating sheets 40 will mainly be described.

[0021] The insulating member 30 has a main body insulating portion 31A that insulates the main body portion 21A of the teeth portion 20, a tip insulating portion 31B that insulates the tip portion 21B of the teeth portion 20, and a core back portion insulating portion 32 that insulates the core back portion 22.

[0022] The main body insulating portion 31A has a side insulating portion 30A that insulates the tooth portion 20 by covering the side surface 20A of the tooth portion 20 from the X direction. The tip insulating portion 31B has an outward-facing surface insulating portion 30B that extends in the X direction in correspondence with the spread of the tip portion 21B of the tooth portion 20 in the X direction and insulates by covering the outward-facing surface 20B. The outward-facing surface insulating portion 30B includes not only the portion that covers the outward-facing surface 20B, but also the portion that extends in the X direction from the portion that covers the outward-facing surface 20B. The outward-facing surface insulating portion 30B has a retaining groove 38 that holds the winding terminal portion 19 connected to the winding winding portion 18. The outward-facing surface insulating portion 30B also has a groove 36. The core back insulating portion 32 has an inward-facing surface insulating portion 32A that insulates the core back portion 22 by covering the inward-facing surface 22A of the core back portion 22.

[0023] The insulating sheet 40 has a main body insulating portion 41A that insulates the main body portion 21A of the teeth portion 20, a tip insulating portion 41B that insulates the tip portion 21B of the teeth portion 20, a core back portion insulating portion 42 that insulates the core back portion 22, and a winding portion insulating portion 50 that insulates adjacent winding portions 18.

[0024] The main body insulating portion 41A has a side insulating portion 40A that insulates the tooth portion 20 by covering the side surface 20A of the tooth portion 20 from the X direction. The tip insulating portion 41B has an outward-facing surface insulating portion 40B that extends in the X direction in accordance with the spread of the tip portion 21B of the tooth portion 20 in the X direction and insulates by covering the outward-facing surface 20B. The core back insulating portion 42 has an inward-facing surface insulating portion 42A that insulates the core back portion 22 by covering the inward-facing surface 22A of the core back portion 22.

[0025] The side insulating portion 40A of the insulating sheet 40 is positioned between the side insulating portion 30A of the insulating member 30 and the side surface 20A of the tooth portion 20, and the side insulating portion 30A of the insulating member 30 insulates the side surface 20A of the tooth portion 20 via the side insulating portion 40A of the insulating sheet 40. The outward-facing insulating portion 40B of the insulating sheet 40 is positioned between the outward-facing insulating portion 30B of the insulating member 30 and the outward-facing surface 20B of the tooth portion 20, and the outward-facing insulating portion 30B of the insulating member 30 insulates the outward-facing surface 20B of the tooth portion 20 via the outward-facing insulating portion 40B of the insulating sheet 40.

[0026] The inward-facing insulating portion 42A of the insulating sheet 40 is positioned between the inward-facing insulating portion 32A of the insulating member 30 and the inward-facing surface 22A of the core back portion 22, and the inward-facing insulating portion 32A of the insulating member 30 insulates the inward-facing surface 22A of the core back portion 22 via the inward-facing insulating portion 42A of the insulating sheet 40. The winding portion insulating portion 50 is connected to the outward-facing insulating portion 40B and is bent toward the core back portion 22 with the tip portion 21B side of the teeth portion 20 as the base end.

[0027] As shown in Figure 4, the winding insulation portion 50 has a protruding portion 52 that protrudes in the Z direction. The protruding portion 52 has a length corresponding to the Z-direction lengths of the side insulation portion 30A, the outward-facing insulation portion 30B, and the inward-facing insulation portion 32A formed on the insulating member 30. The protruding portion 52 has an inner bent portion 54 and an outer bent portion 56. The inner bent portion 54 is bent from the inner end of the protruding portion 52 in the Y direction toward the teeth portion 20. The outer bent portion 56 is bent from the outer end of the protruding portion 52 in the Y direction toward the teeth portion 20. The inner bent portion 54 is formed integrally with the outward-facing insulation portion 40B, and the outer bent portion 56 is formed integrally with the inward-facing insulation portion 42A.

[0028] As shown in Figure 5, in a state where multiple stator components 12 are assembled in a ring shape (see also Figure 1), the multiple insulating sheets 40 attached to each of the multiple core members 14 are arranged in a line in the circumferential direction of the stator 10. Similarly, the multiple winding portions 18 wound around each of the multiple core members 14 are arranged in a line in the circumferential direction of the stator 10.

[0029] The winding portion insulating portion 50 of each insulating sheet 40 is positioned between adjacent winding portions 18 of the multiple winding portions 18. The winding portion insulating portions 50 of adjacent insulating sheets 40 are overlapped in the circumferential direction of the stator 10.

[0030] Hereinafter, one of two adjacent tooth portions 20 will be referred to as the "first tooth portion 20L," and the other of two adjacent tooth portions 20 will be referred to as the "second tooth portion 20R." Furthermore, the insulating sheet 40 attached to the first tooth portion 20L among the multiple insulating sheets 40 will be referred to as the "first insulating sheet 40L," and the insulating sheet 40 attached to the second tooth portion 20R among the multiple insulating sheets 40 will be referred to as the "second insulating sheet 40R."

[0031] Furthermore, the winding insulation portion 50 of the first insulating sheet 40L is referred to as the "first winding insulation portion 50L," the inner folded portion 54 of the first insulating sheet 40L is referred to as the "first inner folded portion 54L," and the outer folded portion 56 of the first insulating sheet 40L is referred to as the "first outer folded portion 56L." Furthermore, the winding insulation portion 50 of the second insulating sheet 40R is referred to as the "second winding insulation portion 50R," the inner folded portion 54 of the second insulating sheet 40R is referred to as the "second inner folded portion 54R," and the outer folded portion 56 of the second insulating sheet 40R is referred to as the "second outer folded portion 56R." The first inner bent portion 54L is an example of the "first bent portion" according to the technology of this disclosure, and the second inner bent portion 54R is an example of the "second bent portion" according to the technology of this disclosure.

[0032] Furthermore, one of the adjacent insulating members 30 is referred to as the "first insulating member 30L," and the other of the adjacent insulating members 30 is referred to as the "second insulating member 30R." The first insulating member 30L and the second insulating member 30R have an inner clamping portion 64. The inner clamping portion 64 is an example of a "clamping portion" according to the technology of this disclosure. The inner clamping portion 64 is formed at the inner ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the inner clamping portion 64 is formed at the ends on each side of the outward-facing insulating portion 30B formed on the first insulating member 30L and the second insulating member 30R. Furthermore, the portion of the first winding section insulation portion 50L on the side of the first inner bent portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bent portion 54R are held together by the inner clamping portion 64.

[0033] The first inner bent portion 54L is inserted into a groove 36 formed in the outward-facing insulating portion 30B of the first insulating member 30L, and the second inner bent portion 54R is inserted into a groove 36 formed in the outward-facing insulating portion 30B of the second insulating member 30R. Furthermore, the first inner bent portion 54L overlaps with the outward-facing insulating portion 30B of the first insulating member 30L in the tangential direction of the stator 10, and the second inner bent portion 54R overlaps with the outward-facing insulating portion 30B of the second insulating member 30R in the tangential direction of the stator 10. In addition, the first outer bent portion 56L overlaps with the inward-facing insulating portion 32A of the first insulating member 30L in the tangential direction of the stator 10, and the second outer bent portion 56R overlaps with the inward-facing insulating portion 32A of the second insulating member 30R in the tangential direction of the stator 10.

[0034] Next, the effects of the stator 10 according to the first embodiment will be described.

[0035] First, in order to clarify the effects of the stator 10 according to the first embodiment, a first comparative example shown in Figure 9 will be described. The stator 110 according to the first comparative example has a configuration in which the inner clamping portion 64 is omitted compared to the stator 10 according to the first embodiment described above. That is, the stator 110 according to the first comparative example has a configuration in which the portion of the first winding section insulation portion 50L on the side of the first inner bend portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bend portion 54R are not clamped.

[0036] As described above, if the inner clamping portion 64 is omitted, the radius of curvature may differ between the corner 58L between the first winding section insulation portion 50L and the first inner bent portion 54L, and between the corner 58R between the second winding section insulation portion 50R and the second inner bent portion 54R. Here, the springback force acting on the first winding section insulation portion 50L depends on the radius of curvature of the corner 58L, and the springback force acting on the second winding section insulation portion 50R depends on the radius of curvature of the corner 58R. Therefore, if the radii of curvature differ between the corner 58L and the corner 58R, an imbalance occurs between the springback force acting on the first winding section insulation portion 50L and the springback force acting on the second winding section insulation portion 50R, and the first winding section insulation portion 50L and the second winding section insulation portion 50R may deform to one side. In this case, the insulating portion 50L of the first winding section and the insulating portion 50R of the second winding section come into contact with one of the adjacent winding sections 18, reducing the heat dissipation performance of the adjacent winding sections 18.

[0037] In contrast, in the stator 10 according to the first embodiment (see Figure 5), the portion of the first winding section insulation portion 50L on the side of the first inner bent portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bent portion 54R are clamped by the inner clamping portion 64. Therefore, the radius of curvature can be made the same at the corner portion 58L and the corner portion 58R, so that the springback force acting on the first winding section insulation portion 50L and the springback force acting on the second winding section insulation portion 50R can be made the same. As a result, deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R that is biased to one side is suppressed, and the first winding section insulation portion 50L and the second winding section insulation portion 50R can be arranged between adjacent winding sections 18, thereby ensuring heat dissipation of adjacent winding sections 18.

[0038] Furthermore, the first inner bent portion 54L overlaps with the outward-facing insulating portion 30B of the first insulating member 30L in the tangential direction of the stator 10, and the second inner bent portion 54R overlaps with the outward-facing insulating portion 30B of the second insulating member 30R in the tangential direction of the stator 10. As a result, an insulating distance (i.e., the phase-to-phase insulating distance D1 in Figure 5) can be secured between adjacent winding end portions 19 along the adjacent outward-facing insulating portions 30B and the first inner bent portion 54L and the second inner bent portion 54R, thereby improving the insulation between adjacent winding end portions 19.

[0039] Furthermore, the first outer bent portion 56L overlaps with the inward-facing insulating portion 32A of the first insulating member 30L in the tangential direction of the stator 10, and the second outer bent portion 56R overlaps with the inward-facing insulating portion 32A of the second insulating member 30R in the tangential direction of the stator 10. As a result, an insulating distance (i.e., the phase-to-phase insulating distance D2 in Figure 5) can be secured between adjacent winding portions 18 along the adjacent inward-facing insulating portions 32A, the first outer bent portion 56L, and the second outer bent portion 56R, thereby improving the insulation between adjacent winding portions 18.

[0040] [Second Embodiment] Next, a second embodiment of the technology of the present disclosure will be described.

[0041] As shown in Figure 6, in the second embodiment, the configuration of the first insulating member 30L, the second insulating member 30R, the first insulating sheet 40L, and the second insulating sheet 40R is modified from that of the first embodiment as follows. That is, the first insulating member 30L and the second insulating member 30R have an inner clamping portion 64 and an outer clamping portion 66. The outer clamping portion 66 is an example of the "clamping portion" and "first clamping portion" according to the technology of this disclosure, and the inner clamping portion 64 is an example of the "second clamping portion" according to the technology of this disclosure.

[0042] The inner clamping portion 64 is formed at the inner ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the inner clamping portion 64 is formed at the opposite ends of the outer surface insulating portion 30B formed on the first insulating member 30L and the second insulating member 30R. The outer clamping portion 66 is formed at the outer ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the outer clamping portion 66 is formed at the opposite ends of the inner surface insulating portion 32A formed on the first insulating member 30L and the second insulating member 30R.

[0043] The first insulating sheet 40L has a first outer bent portion 56L bent from the outer end of the first winding winding portion insulating portion 50L in the radial direction of the stator 10 toward the first teeth portion 20L, and the second insulating sheet 40R has a second outer bent portion 56R bent from the outer end of the second winding winding portion insulating portion 50R in the radial direction of the stator 10 toward the second teeth portion 20R. The first outer bent portion 56L is an example of the "first bent portion" according to the technology of the present disclosure, and the second outer bent portion 56R is an example of the "second bent portion" according to the technology of the present disclosure.

[0044] The first outer bent portion 56L may be formed as the inner surface insulating portion 42A formed on the first insulating sheet 40L. Similarly, the second outer bent portion 56R may be formed as the inner surface insulating portion 42A formed on the second insulating sheet 40R. In the second embodiment, the first inner bent portion 54L and the second inner bent portion 54R (see FIG. 5) in the above-described first embodiment are omitted.

[0045] The portion of the first winding winding portion insulating portion 50L on the side of the first outer bent portion 56L and the portion of the second winding winding portion insulating portion 50R on the side of the second outer bent portion 56R are clamped by the outer clamping portion 66. Also, the portion of the first winding winding portion insulating portion 50L opposite to the first outer bent portion 56L and the portion of the second winding winding portion insulating portion 50R opposite to the first outer bent portion 56L are clamped by the inner clamping portion 64.

[0046] Next, the effects of the stator 10 according to the second embodiment will be described.

[0047] First, in order to clarify the effects of the stator 10 according to the second embodiment, a second comparative example shown in FIG. 10 will be described. The stator 210 according to the second comparative example is configured such that the outer clamping portion 66 is omitted with respect to the stator 10 according to the above-described first embodiment. That is, the stator 210 according to the second comparative example is configured such that the portion on the first outer bending portion 56L side of the first winding portion insulating portion 50L and the portion on the second outer bending portion 56R side of the second winding portion insulating portion 50R are not clamped.

[0048] Thus, when the outer clamping portion 66 is omitted, the corner radius of curvature between the corner 60L between the first winding portion insulating portion 50L and the first outer bending portion 56L and the corner 60R between the second winding portion insulating portion 50R and the second outer bending portion 56R may be different. Here, the springback force acting on the first winding portion insulating portion 50L depends on the radius of curvature of the corner 60L, and the springback force acting on the second winding portion insulating portion 50R depends on the radius of curvature of the corner 60R. Therefore, when the radius of curvature is different between the corner 60L and the corner 60R, an imbalance occurs between the springback force acting on the first winding portion insulating portion 50L and the springback force acting on the second winding portion insulating portion 50R, and the first winding portion insulating portion 50L and the second winding portion insulating portion 50R may be deformed so as to be biased to one side. In this case, the first winding portion insulating portion 50L and the second winding portion insulating portion 50R come into contact with one of the adjacent winding portions 18, and the heat dissipation of the winding portion 18 decreases.

[0049] Further, when the outer clamping portion 66 is omitted, the radius of curvature of the corner 60L and the corner 60R increases. Then, when the refrigerant is passed between the adjacent winding portions 18 to cool the adjacent winding portions 18, the cross-sectional area of the space 70 that does not contribute to heat dissipation with respect to the adjacent winding portions 18 (that is, the space on the opposite side of the adjacent winding portions 18 with respect to the first insulating sheet 40L and the second insulating sheet 40R) increases, and the heat dissipation of the adjacent winding portions 18 further decreases.

[0050] In contrast, in the stator 10 according to the second embodiment (see Figure 6), the portion of the first winding section insulation portion 50L on the side of the first outer bent portion 56L and the portion of the second winding section insulation portion 50R on the side of the second outer bent portion 56R are clamped by the outer clamping portion 66. Therefore, the radius of curvature can be made the same at the corner portion 60L and the corner portion 60R, so that the springback force acting on the first winding section insulation portion 50L and the springback force acting on the second winding section insulation portion 50R can be made the same. As a result, deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R that is biased to one side is suppressed, and the first winding section insulation portion 50L and the second winding section insulation portion 50R can be arranged between adjacent winding sections 18, thereby ensuring heat dissipation of adjacent winding sections 18.

[0051] Furthermore, by having the outer clamping portion 66, it is possible to suppress the increase in the radius of curvature of the corners 60L and 60R. As a result, when a coolant is flowed between adjacent winding portions 18 to cool the adjacent winding portions 18, the cross-sectional area of ​​the space 70 that does not contribute to heat dissipation from the adjacent winding portions 18 (i.e., the space on the opposite side of the adjacent winding portions 18 from the first insulating sheet 40L and the second insulating sheet 40R) can be reduced, thereby improving the heat dissipation of the adjacent winding portions 18.

[0052] Furthermore, the portion of the first winding section insulation portion 50L opposite to the first outer bent portion 56L and the portion of the second winding section insulation portion 50R opposite to the second outer bent portion 56R are clamped by the inner clamping portion 64. This makes it possible to more effectively suppress deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R so as to be biased to one side.

[0053] [Third Embodiment] Next, a third embodiment of the technology of the present disclosure will be described.

[0054] As shown in Figure 7, in the third embodiment, the configuration of the first insulating sheet 40L and the second insulating sheet 40R is modified from that of the second embodiment as follows. Specifically, the first insulating sheet 40L has a first inner bent portion 54L that is bent from the inner end of the first winding section insulating portion 50L in the radial direction of the stator 10 toward the first teeth portion 20L, and the second insulating sheet 40R has a second inner bent portion 54R that is bent from the inner end of the second winding section insulating portion 50R in the radial direction of the stator 10 toward the second teeth portion 20R. The first inner bent portion 54L is an example of the "first bent portion" according to the technology of this disclosure, and the second inner bent portion 54R is an example of the "second bent portion" according to the technology of this disclosure.

[0055] The first inner folded portion 54L may be formed as an outward-facing insulating portion 40B formed on the first insulating sheet 40L. Similarly, the second outer folded portion 56R may be formed as an outward-facing insulating portion 40B formed on the second insulating sheet 40R.

[0056] The first winding section insulation portion 50L has a first extension portion 50A extending from the radially outer side to the inner side of the stator 10, and a second extension portion 50B extending from the radially inner side to the outer side of the stator 10. The first extension portion 50A and the second extension portion 50B have a first overlap portion 74 that overlaps radially with the stator 10. The second winding section insulation portion 50R has a third extension portion 50C extending from the radially outer side to the inner side of the stator 10, and a fourth extension portion 50D extending from the radially inner side to the outer side of the stator 10. The third extension portion 50C and the fourth extension portion 50D have a second overlap portion 76 that overlap radially with the stator 10.

[0057] Next, we will explain the differences in the effects of the stator 10 according to the third embodiment compared to the second embodiment.

[0058] In the stator 10 according to the third embodiment, the first extension portion 50A and the second extension portion 50B formed in the first winding section insulating portion 50L have a first overlap portion 74 that overlaps radially in the stator 10. As a result, in the stator component 12 having the first winding section insulating portion 50L, an insulating distance along the first extension portion 50A and the first overlap portion 74 (i.e., the ground insulating distance D3 in Figure 7) can be secured between the core member 14 and the winding section 18, thereby improving the insulation to the core member 14. Furthermore, in the stator component 12 having the first winding section insulating portion 50L, an insulating distance along the second extension portion 50B, the outward-facing insulating portion 30B, and the outward-facing insulating portion 40B (i.e., the ground insulating distance D4 in Figure 7) can be secured between the core member 14 and the winding end portion 19, thereby improving the insulation to the core member 14.

[0059] Similarly, the third extension portion 50C and the fourth extension portion 50D formed on the second winding section insulating portion 50R have a second overlap portion 76 that overlaps radially with the stator 10. This allows the stator component 12 having the second winding section insulating portion 50R to secure an insulating distance along the third extension portion 50C and the second overlap portion 76 (i.e., the ground insulating distance D5 in Figure 7) between the core member 14 and the winding section 18, thereby improving the insulation to the core member 14. Furthermore, in the stator component 12 having the second winding section insulating portion 50R, an insulating distance along the fourth extension portion 50D, the outward-facing insulating portion 30B, and the outward-facing insulating portion 40B (i.e., the ground insulating distance D6 in Figure 7) can be secured between the core member 14 and the winding end portion 19, thereby improving the insulation to the core member 14.

[0060] Furthermore, since an insulating distance (i.e., the phase-to-phase insulating distance D7 in Figure 7) can be secured between adjacent winding sections 18 along the first overlap section 74 and the second overlap section 76, the insulating properties between adjacent winding sections 18 can be improved.

[0061] [Fourth Embodiment] Next, a fourth embodiment of the technology of the present disclosure will be described.

[0062] As shown in Figure 8, in the fourth embodiment, the configuration of the first insulating member 30L, the second insulating member 30R, the first insulating sheet 40L, and the second insulating sheet 40R is modified from that of the first embodiment as follows. That is, the first insulating member 30L and the second insulating member 30R have an inner clamping portion 64 and an outer clamping portion 66. The inner clamping portion 64 is an example of the "clamping portion" and "first clamping portion" according to the technology of this disclosure, and the outer clamping portion 66 is an example of the "second clamping portion" according to the technology of this disclosure.

[0063] The inner clamping portion 64 is formed at the inner ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the inner clamping portion 64 is formed at the mutual ends of the outward-facing insulating portion 30B formed on the first insulating member 30L and the second insulating member 30R. The outer clamping portion 66 is formed at the outer ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the outer clamping portion 66 is formed at the mutual ends of the inward-facing insulating portion 32A formed on the first insulating member 30L and the second insulating member 30R.

[0064] The first insulating sheet 40L has a first inner bent portion 54L that is bent from the inner end of the first winding section insulating portion 50L in the radial direction of the stator 10 toward the first teeth portion 20L, and the second insulating sheet 40R has a second inner bent portion 54R that is bent from the inner end of the second winding section insulating portion 50R in the radial direction of the stator 10 toward the second teeth portion 20R. The first inner bent portion 54L is an example of the "first bent portion" according to the technology of this disclosure, and the second inner bent portion 54R is an example of the "second bent portion" according to the technology of this disclosure.

[0065] The first inner bent portion 54L may be formed as an outward-facing insulating portion 40B formed on the first insulating sheet 40L. Similarly, the second inner bent portion 54R may be formed as an outward-facing insulating portion 40B formed on the second insulating sheet 40R. In the fourth embodiment, the first outer bent portion 56L and the second outer bent portion 56R (see Figure 5) in the first embodiment described above are omitted.

[0066] Furthermore, the portion of the first winding section insulation portion 50L on the side of the first inner bend portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bend portion 54R are held together by the inner clamping portion 64. In addition, the portion of the first winding section insulation portion 50L opposite to the first inner bend portion 54L and the portion of the second winding section insulation portion 50R opposite to the first inner bend portion 54L are held together by the outer clamping portion 66.

[0067] Next, the effects of the stator 10 according to the fourth embodiment will be described.

[0068] In the stator 10 according to the fourth embodiment, the portion of the first winding section insulation portion 50L on the side of the first inner bent portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bent portion 54R are clamped by the inner clamping portion 64. Therefore, the radius of curvature can be made the same at the corner portion 58L and the corner portion 58R, so that the springback force acting on the first winding section insulation portion 50L and the springback force acting on the second winding section insulation portion 50R can be made the same. This suppresses deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R so as to be biased to one side, and the first winding section insulation portion 50L and the second winding section insulation portion 50R can be arranged between adjacent winding sections 18, thereby ensuring heat dissipation of adjacent winding sections 18.

[0069] Furthermore, the portion of the first winding section insulation portion 50L opposite to the first inner bent portion 54L and the portion of the second winding section insulation portion 50R opposite to the second inner bent portion 54R are clamped by the outer clamping portion 66. This makes it possible to more effectively suppress deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R so as to be biased to one side.

[0070] Although one embodiment of the technology of this disclosure has been described above, the present invention is not limited to the above, and it is of course possible to implement it in various modified forms without departing from the spirit of the invention.

[0071] The following are additional notes regarding the technology of this disclosure. (Note 1) A stator core (24) having a plurality of radially extending teeth (20), a plurality of insulating members (30) attached to the plurality of teeth, a plurality of insulating sheets (40) attached to the plurality of teeth, and a plurality of winding portions (18) wound around the plurality of teeth via the insulating members and insulating sheets, wherein the plurality of insulating sheets include a first insulating sheet (40L) attached to a first tooth portion (20L) of an adjacent tooth portion, and a second insulating sheet (40R) attached to a second tooth portion (20R) of an adjacent tooth portion, wherein the first insulating sheet includes a first winding portion insulating portion (50L) that insulates adjacent winding portions, The stator (10) has a first bent portion (54L, 56L) that is bent from the end of the first winding section insulating portion in the radial direction of the stator core toward the first teeth portion, and the second insulating sheet has a second winding section insulating portion (50R) that insulates adjacent winding sections, and a second bent portion (54R, 56R) that is bent from the end of the second winding section insulating portion in the radial direction of the stator core toward the second teeth portion, and adjacent insulating members have clamping portions (64, 66) that clamp the portion of the first winding section insulating portion toward the first bent portion and the portion of the second winding section insulating portion toward the second bent portion. (Note 2) The stator as described in Note 1, wherein the first bent portion is bent from the inner end of the first winding section insulation portion in the radial direction of the stator core toward the first teeth portion, the second bent portion is bent from the inner end of the second winding section insulation portion in the radial direction of the stator core toward the second teeth portion, and the clamping portion is formed at the inner end of the insulating member in the radial direction of the stator core.(Note 3) The stator according to Note 1, wherein the first bent portion is bent from the outer end of the first winding section insulation portion in the radial direction of the stator core toward the first teeth portion, the second bent portion is bent from the outer end of the second winding section insulation portion in the radial direction of the stator core toward the second teeth portion, and the clamping portion is formed at the outer end of the insulating member in the radial direction of the stator core. (Note 4) The stator according to any one of Notes 1 to 3, wherein adjacent insulating members have a first clamping portion as the clamping portion, and a second clamping portion that clamps the portion of the first winding section insulation portion opposite to the first bent portion and the portion of the second winding section insulation portion opposite to the second bent portion. (Note 5) The stator according to any one of Notes 1 to 4, wherein the first winding section insulation portion has a first extension portion (50A) extending radially from the outside to the inside of the stator core, and a second extension portion (50B) extending radially from the inside to the outside of the stator core, and the first extension portion and the second extension portion have a first overlap portion (74) that overlap radially with the stator core, and the second winding section insulation portion has a third extension portion (50C) extending radially from the outside to the inside of the stator core, and a fourth extension portion (50D) extending radially from the inside to the outside of the stator core, and the third extension portion and the fourth extension portion have a second overlap portion (76) that overlap radially with the stator core. (Note 6) A rotating electric machine (M) comprising a stator as described in any one of Notes 1 to 5, and a rotor (11) rotatably housed inside the stator.

Claims

1. A stator core (24) having a plurality of radially extending teeth (20), a plurality of insulating members (30) attached to the plurality of teeth, a plurality of insulating sheets (40) attached to the plurality of teeth, and a plurality of winding sections (18) wound around the plurality of teeth via the insulating members and insulating sheets, wherein the plurality of insulating sheets include a first insulating sheet (40L) attached to a first tooth section (20L) of adjacent teeth, and a second insulating sheet (40R) attached to a second tooth section (20R) of adjacent teeth, and the first insulating sheet includes a first winding section insulating section (50L) that insulates adjacent winding sections, The stator (10) has a first bent portion (54L, 56L) that is bent from the end of the first winding section insulating portion in the radial direction of the stator core toward the first teeth portion, and the second insulating sheet has a second winding section insulating portion (50R) that insulates adjacent winding sections, and a second bent portion (54R, 56R) that is bent from the end of the second winding section insulating portion in the radial direction of the stator core toward the second teeth portion, and adjacent insulating members have clamping portions (64, 66) that clamp the portion of the first winding section insulating portion toward the first bent portion and the portion of the second winding section insulating portion toward the second bent portion.

2. The stator according to claim 1, wherein the first bent portion is bent from the inner end of the first winding section insulation portion in the radial direction of the stator core toward the first teeth portion, the second bent portion is bent from the inner end of the second winding section insulation portion in the radial direction of the stator core toward the second teeth portion, and the clamping portion is formed at the inner end of the insulating member in the radial direction of the stator core.

3. The stator according to claim 1, wherein the first bent portion is bent from the outer end of the insulating portion of the first winding in the radial direction of the stator core toward the first teeth portion, the second bent portion is bent from the outer end of the insulating portion of the second winding in the radial direction of the stator core toward the second teeth portion, and the clamping portion is formed at the outer end of the insulating member toward the radial direction of the stator core.

4. The stator according to any one of claims 1 to 3, wherein adjacent insulating members each have a first clamping portion as a clamping portion, and a second clamping portion that clamps the portion of the first winding portion insulating part opposite to the first bent portion and the portion of the second winding portion insulating part opposite to the second bent portion.

5. The stator according to any one of claims 1 to 4, wherein the first winding insulation portion has a first extension portion (50A) extending radially from the outside to the inside of the stator core and a second extension portion (50B) extending radially from the inside to the outside of the stator core, the first extension portion and the second extension portion have a first overlap portion (74) that overlap radially with the stator core, the second winding insulation portion has a third extension portion (50C) extending radially from the outside to the inside of the stator core and a fourth extension portion (50D) extending radially from the inside to the outside of the stator core, the third extension portion and the fourth extension portion have a second overlap portion (76) that overlap radially with the stator core.

6. A rotating electric machine (M) comprising: a stator according to any one of claims 1 to 5; and a rotor (11) rotatably housed inside the stator.

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