Stator, rotary electric machine, insulator, and stator core

Abstract

This stator (10) comprises a stator core (24), an insulator (16) for insulating the stator core, and a coil winding section (18) that is wound around the stator core with the insulator interposed therebetween. A ventilation path (56) extending in the axial direction of the stator core is formed between the stator core and the coil winding section.

Description

Stator, rotating electric machine, insulator, and stator core CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on and claims the benefit of priority from Japanese Patent Application No. 2024-155240, filed on September 9, 2024, the entire contents of which are incorporated herein by reference.

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

[0003] Conventionally, there is a rotating electric machine including a stator core, an insulator that insulates the stator core, and a winding wound around the stator core via the insulator. In this rotating electric machine, if the temperature of the winding increases as current flows through the winding, the performance of the rotating electric machine may be degraded. Therefore, various techniques have been proposed for cooling the winding.

[0004] For example, International Publication No. 2013 / 054811 discloses a rotating electric machine having a first inclined surface (39) that intersects at a predetermined angle with a plane including the axis of a shaft (23) and is disposed radially outward of a gap between coil ends (34 c) of circumferentially adjacent concentrated winding coils (34). The first inclined surface converts cooling air blown from a cooling fan (25) and flowing radially outward through the gap between the coil ends into an axially outward flow. According to this publication, the radially outward flow of cooling air that cools the coil ends of the concentrated winding coil and reaches the inner peripheral wall surface of the housing (1) is converted into an axially outward flow, thereby efficiently forming a circulating flow of cooling air and improving the cooling performance of the coil ends of the concentrated winding coil. The reference symbols in parentheses are those described in the publication.

[0005] As a result of detailed investigations by the inventors, the following problem was found: In the rotating electric machine described in the above document, although the coil ends of the concentrated winding coil can be cooled by cooling air, cooling air is not supplied to an intermediate portion between one coil end and the other coil end of the concentrated winding coil, which may result in insufficient cooling of the intermediate portion of the concentrated winding coil, and ultimately the entire concentrated winding coil.

[0006] The techniques disclosed herein provide a stator, a rotating electric machine, an insulator, and a stator core that can improve the cooling effect on a winding winding portion compared to conventional techniques.

[0007] A first aspect of the technology of the present disclosure is a stator comprising a stator core, an insulator that insulates the stator core, and a winding winding portion wound around the stator core via the insulator, wherein an air passage extending in the axial direction of the stator core is formed between the stator core and the winding winding portion.

[0008] A second aspect of the technology of the present disclosure is a stator comprising a stator core, an insulator that insulates the stator core, and a winding winding portion wound around the stator core via the insulator, wherein the stator core has a core back portion that extends circumferentially of the stator core, the core back portion having a notch that opens radially outward of the stator core and penetrates the stator core in the axial direction, and the notch forms an air passage that extends axially of the stator core.

[0009] A third aspect of the disclosed technology is a rotating electric machine (M) comprising a stator according to the first or second aspect and a rotor (11) rotatably housed inside the stator core.

[0010] A fourth aspect of the technology of the present disclosure is an insulator that insulates a stator core from a winding winding portion, the insulator having a side insulating portion that insulates the side surfaces of teeth formed on the stator core, and a support portion that protrudes tangentially from the stator core relative to the side insulating portion and supports the winding winding portion from inside the winding winding portion, the support portion forming an air passage extending in the axial direction of the stator core between the stator core and the winding winding portion.

[0011] A fifth aspect of the technology of the present disclosure is an insulator that insulates a stator core from a winding winding portion, the insulator having an insulating member that insulates the tooth portion, the insulating member having a side insulating portion that insulates a side surface of the tooth portion, the side insulating portion having a recessed portion, and the recessed portion forming an air passage extending in the axial direction of the stator core between the stator core and the winding winding portion.

[0012] A sixth aspect of the technology of the present disclosure is a stator core in which a winding winding portion is wound via an insulator, the stator core having teeth portions extending radially of the stator core, the teeth portions having side surfaces facing tangentially to the stator core, the side surfaces of the teeth portions having recesses, and the recesses forming ventilation passages extending axially of the stator core between the stator core and the winding winding portion.

[0013] According to the techniques of the present disclosure, a stator, a rotating electric machine, an insulator, and a stator core are provided that can improve the cooling effect on the winding winding portion compared to conventional techniques.

[0014] 6A and 6B are longitudinal sectional views of a rotating electric machine according to a first embodiment; a graph showing the relationship between the pressure inside a casing of the rotating electric machine according to the first embodiment and the position in the axial direction of the casing; a transverse sectional view of a rotating electric machine according to the first embodiment; a transverse sectional view of a stator component according to the first embodiment; an exploded perspective view of a stator component according to the first embodiment; an enlarged transverse sectional view of a main part of the rotating electric machine according to the first embodiment; a cross-sectional view taken along line A-A in FIG. 6; a diagram showing the configuration of an insulator according to the first embodiment; a longitudinal sectional view of a stator component according to the first embodiment; a longitudinal sectional view of a main part of the rotating electric machine according to the first embodiment; a diagram showing the configuration of an insulator according to the first embodiment; a diagram showing the configuration of an insulator according to the first embodiment; a diagram showing the configuration of a stator component and an insulating sheet according to the first embodiment; a perspective view of a cooling flow path according to the first embodiment; a diagram showing the configuration of an insulator according to the second embodiment; a longitudinal sectional view of a stator component according to the second embodiment; a perspective view of a cooling flow path according to the second embodiment; a plan view of a core component according to the third embodiment; a longitudinal sectional view of a stator component according to the third embodiment; a diagram showing the configuration of a rotating electric machine and a core component according to a fourth embodiment; a diagram showing the configuration of an insulator according to the fourth embodiment; a perspective view of a cooling flow path according to the fourth embodiment. Fig. 10 is an enlarged cross-sectional view of a main part of a rotary electric machine according to a fifth embodiment Fig. 11 is a longitudinal cross-sectional view of a stator component according to a fifth embodiment.

[0015] First Embodiment First, a first embodiment of the technology of the present disclosure will be described.

[0016] As shown in Fig. 1, the rotating electric machine M includes a stator 10, a rotor 11, and a casing 13. The stator 10 includes a stator core 24, an insulator 16 that insulates the stator core 24, and a winding 18 wound around the stator core 24 via the insulator 16. The stator core 24 is formed in an annular shape, and the rotor 11 is rotatably housed inside the stator core 24. The stator 10 and the rotor 11 form an inner rotor type brushless motor. The Z1 side indicates one axial side of the stator 10, and the Z2 side indicates the other axial side of the stator 10.

[0017] The casing 13 is formed in a cylindrical shape with both axial ends closed, and houses the stator 10 and the rotor 11. The rotating electric machine M is, for example, an electric compressor or a fan motor, and the casing 13 has an inlet 15 and an outlet 17 through which cooling air flows in and out as the rotating electric machine M operates. The inlet 15 is located on one axial side of the stator 10 and opens in the radial direction of the stator 10. The outlet 17 is located on the other axial side of the stator 10 and opens in the axial direction of the stator 10.

[0018] 2 shows a graph in which the vertical axis represents the axial position of the casing 13 and the horizontal axis represents the pressure inside the casing 13. As shown in the graph, a pressure difference occurs inside the casing 13 between the space on the inlet 15 side and the space on the outlet 17 side as the rotating electric machine M operates. This creates a cooling air flow in which cooling air flows in from the inlet 15 and flows out from the outlet 17.

[0019] As shown in Fig. 3, the stator 10 includes a plurality of stator components 12. The stator 10 is configured by combining the plurality of stator components 12 in an annular shape. Fig. 1 shows the configuration of half of a rotating electric machine M, including the stator 10, a rotor 11, and a casing 13. The configuration of the stator 10 of the rotating electric machine M will be described in detail below.

[0020] 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. In the following description, the circumferential direction of the stator 10 refers to the direction around the central axis of the stator 10. The tangential direction, radial direction, axial direction, and circumferential direction of the stator core 24 are the same as the tangential direction, radial direction, axial direction, and circumferential direction of the stator 10, respectively.

[0021] As shown in Figure 4, each stator component 12 includes a core member 14, an insulator 16, and a winding winding portion 18. The core member 14 is formed in a T-shape when viewed from the Z direction, and has teeth portions 20 and a core back portion 22. The core member 14 is formed symmetrically in the X direction. The configuration of one side of the core member 14 will be described below. The core back portion 22 extends in the circumferential direction of the stator core 24, and the teeth portions 20 extend inward in the Y direction from the center of the core back portion 22.

[0022] The tooth portion 20 has a main body portion 21A and a tip portion 21B. The main body portion 21A of the tooth portion 20 is the portion between the tip portion 21B and the base end of the tooth portion 20. The tip portion 21B of the tooth portion 20 is a free end, and the base end of the tooth portion 20 is connected to the core back portion 22. The width of the tip portion 21B of the tooth portion 20 is wider in the X direction than the main body portion 21A of the tooth portion 20.

[0023] The core member 14 is a laminate in which multiple core sheets are stacked in the Z direction. The multiple core members 14 are combined in an annular shape to form the stator core 24 (see FIG. 3). That is, the stator core 24 is formed from multiple core members 14 that are divided into individual tooth portions 20. When the stator core 24 is constructed, the multiple core back portions 22 form an annular portion 26 (see FIG. 3) that is the outer periphery of the stator core 24, and the multiple tooth portions 20 extend radially from the center of the stator core 24. Slots 28 (see FIG. 3) are formed between the multiple tooth portions 20.

[0024] As shown in FIG. 5 , the tooth portion 20 has a side surface 20A facing the X direction and an end surface 20B facing the Z direction. The side surface 20A extends in the Y direction and the Z direction, and the end surface 20B extends in the X direction and the Y direction. The core back portion 22 has an inner surface 22A facing inward in the Y direction, an end surface 22B facing in the Z direction, and an outer surface 22C facing outward in the Y direction. The inner surface 22A extends in the X direction and the Z direction, the end surface 22B extends in the X direction and the Y direction, and the outer surface 22C is formed along the circumferential direction of the stator core 24. The outer surface has a concave notch 29 that opens outward in the Y direction and penetrates in the X direction. The notch 29 is used to position the core member 14.

[0025] The insulator 16 has a pair of insulating members 30 and a pair of insulating sheets 40. In FIG. 5, the winding winding portion 18 (see FIG. 4) is not shown. The insulating member 30 is a three-dimensional resin part formed by resin molding. The insulating sheet 40 is a resin sheet material formed into a sheet shape. The insulating sheet 40 is in a folded state. The pair of insulating members 30 are formed symmetrically in the Z direction, and the pair of insulating sheets 40 are formed symmetrically in the X direction.

[0026] Unless otherwise specified, the following description will focus on one of the pair of insulating members 30. Similarly, the following description will focus on one of the pair of insulating sheets 40. When describing the pair of insulating members 30 separately, the insulating member 30 arranged on the Z1 side of the pair of insulating members 30 will be referred to as the "first insulating member 30A," and the insulating member 30 arranged on the Z2 side will be referred to as the "second insulating member 30B."

[0027] The insulating member 30 has a main body insulating portion 32 that insulates the main body portion 21A of the tooth portion 20, a tip portion insulating portion 34 that insulates the tip portion 21B of the tooth portion 20, and a core back portion insulating portion 36 that insulates the core back portion 22. The main body insulating portion 32 has a side surface insulating portion 32A that insulates the side surface 20A of the tooth portion 20 and an end surface insulating portion 32B that insulates the end surface 20B of the tooth portion 20. The core back portion insulating portion 36 has an inner surface insulating portion 36A that insulates the inner surface 22A of the core back portion 22 and an end surface insulating portion 36B that insulates the end surface 22B of the core back portion 22.

[0028] The insulating sheet 40 has a side insulating portion 42 that insulates the side surface 20A of the tooth portion 20, a tip insulating portion 44 that insulates the tip portion 21B of the tooth portion 20, an inner side insulating portion 46 that insulates the inner side surface 22A of the core back portion 22, and a winding winding portion insulating portion 48 that insulates adjacent winding winding portions 18 (see FIG. 3 ) in the circumferential direction of the stator core 24. The side insulating portion 42 of the insulating sheet 40 is overlapped with the side insulating portion 32A of the insulating member 30 from the side opposite the side surface 20A of the tooth portion 20. The side insulating portion 42 of the insulating sheet 40 is an example of an "overlapping portion" according to the technology of the present disclosure. The tip insulating portion 44 of the insulating sheet 40 is overlapped with the tip insulating portion 34 of the insulating member 30 from the side opposite the tip portion 21B of the tooth portion 20. The inner surface insulating portion 46 of the insulating sheet 40 is superimposed on the inner surface insulating portion 36A of the insulating member 30 from the side opposite to the inner surface 22A of the core back portion 22.

[0029] With the winding winding portion insulating portion 48 spread out in the X direction, the winding is wound around the tooth portion 20 in the Y direction to form the winding winding portion 18. That is, the winding winding portion 18 is wound around the tooth portion 20 via the insulating member 30 and the insulating sheet 40. The winding winding portion insulating portion 48 is folded after the winding winding portion 18 is formed. The winding is, for example, a copper wire.

[0030] Incidentally, the rotating electric machine M having the above configuration may be required to have a shorter shaft due to constraints imposed on the object on which the rotating electric machine M is mounted. Furthermore, for example, if the winding is made of copper wire, when the temperature of the winding winding portion 18 rises as current is applied to the winding winding portion 18, copper loss increases with the temperature rise, and the performance of the rotating electric machine M may be degraded. While it is conceivable to compensate for the performance degradation due to copper loss by increasing the lamination thickness of the core sheet, doing so makes it difficult to shorten the shaft of the rotating electric machine M. Therefore, in order to shorten the shaft of the rotating electric machine M, a structure for cooling the winding winding portion 18 is required that does not require an increase in the lamination thickness of the core sheet. Furthermore, adding a dedicated member for cooling the winding winding portion 18 would not only make it difficult to shorten the shaft of the rotating electric machine M, but also make it difficult to reduce the cost of the rotating electric machine M. Therefore, in the first embodiment, the following structure is adopted as a structure for cooling the winding winding portion 18 while achieving a shorter shaft and lowering the cost of the rotating electric machine M.

[0031] As shown in FIGS. 6 and 7 , the stator 10 has an outer ventilation passage 54 and an inner ventilation passage 56 for each winding winding portion 18. The outer ventilation passage 54 is formed outside the winding winding portion 18, and the inner ventilation passage 56 is formed inside the winding winding portion 18. The inner ventilation passage 56 is an example of an "air passage" according to the technology disclosed herein. The outer ventilation passage 54 is formed between winding winding portions 18 adjacent to each other in the circumferential direction of the stator core 24, more specifically, between the winding winding portion 18 and the winding winding portion insulating portion 48 of the insulating sheet 40. The inner ventilation passage 56 is formed between the stator core 24 and the winding winding portion 18, more specifically, between the side insulating portion 42 of the insulating sheet 40 and the winding winding portion 18. The outer ventilation passage 54 and the inner ventilation passage 56 each extend in the Z direction.

[0032] 8, the insulating member 30 has a support portion 58. The support portion 58 is formed at a corner between the side surface insulating portion 32A and the end surface insulating portion 32B of the insulating member 30. The support portion 58 protrudes in the X direction relative to the side surface insulating portion 32A. When the inner surface of the side surface insulating portion 32A is used as the dimensional reference, a protruding dimension L1 of the support portion 58 is larger than a plate thickness dimension L2 of the side surface insulating portion 32A (L1>L2).

[0033] 9 , the side insulating portion 42 of the insulating sheet 40 is overlapped with the side insulating portion 32A of the insulating member 30 from the side opposite to the side surface 20A of the tooth portion 20, and the support portion 58 also protrudes in the X direction from the side insulating portion 42 of the insulating sheet 40. The support portion 58 supports the winding portion 18 from the inside of the winding portion 18. This forms an inner ventilation passage 56 between the side insulating portion 42 and the winding portion 18.

[0034] 10 , each insulating member 30 (i.e., the first insulating member 30A and the second insulating member 30B) has a first open path 60, a second open path 62, and a third open path 64. The first open path 60, the second open path 62, and the third open path 64 are examples of "open paths" according to the technology of the present disclosure. The first open path 60 is formed in the end face insulating portion 36B that insulates the end face 22B of the core back portion 22, and the second open path 62 and the third open path 64 are formed in the end face insulating portion 32B that insulates the end face 20B of the tooth portion 20.

[0035] The first open passage 60 is open outward in the Y direction, the second open passage 62 is open inward in the Y direction, and the third open passage 64 is open in the Z direction. The first open passage 60, the second open passage 62, and the third open passage 64 are connected to the inner ventilation passage 56 (see FIG. 9 ). The first open passage 60, the second open passage 62, and the third open passage 64 formed in the first insulating member 30A function as inflow passages that allow cooling air flowing in from the inlet 15 (see FIG. 1 ) to flow into the inner ventilation passage 56. The first open passage 60, the second open passage 62, and the third open passage 64 formed in the second insulating member 30B function as outflow passages that allow cooling air flowing out from the inner ventilation passage 56 to flow toward the outlet 17 (see FIG. 1 ).

[0036] As shown in FIGS. 11 and 12 , a recess 66 is formed in the insulating member 30. The recess 66 is formed across the end surface insulating portion 32B and the end surface insulating portion 36B. The recess 66 is recessed in the Z direction from the end surface 20B of the tooth portion 20 and the end surface 22B of the core back portion 22 (see FIG. 5 ) side and penetrates in the Y direction. The recess 66 forms a first open path 60 and a second open path 62 (see FIG. 10 ). The end surface insulating portion 32B is formed with a rectangular opening 68 that penetrates in the Z direction. The opening 68 forms a third open path 64 (see FIG. 10 ). The end surface insulating portion 36B is formed with a notch 70 that is cut out from the outside in the Y direction. A rectangular opening 72 that penetrates in the X direction is formed between the end surface insulating portion 32B and the side surface insulating portion 32A in the X direction. The opening 72 forms a first communication path 76.

[0037] As shown in FIG. 13 , when the insulating sheet 40 is unfolded in a planar state, a notch 74 is formed at the Z-direction end of the side insulating portion 42 among the side insulating portion 42, the tip insulating portion 44, the inner side insulating portion 46, and the winding winding insulating portion 48. The notch 74 defines a second communication passage 78. The second communication passage 78 is formed in a position aligned with the first communication passage 76. The first communication passage 76 is located between the end surface insulating portion 32B and the side insulating portion 32A in the Z direction, and the second communication passage 78 is located between the end surface insulating portion 32B and the side insulating portion 42 in the Z direction. The first communication passage 76 and the second communication passage 78 communicate the first open passage 60, the second open passage 62, and the third open passage 64 (see FIG. 10 ) with the inner ventilation passage 56. The first communication passage 76 and the second communication passage 78 are examples of “communication passages” according to the technology disclosed herein.

[0038] 14 , the inner ventilation passage 56, the first open passage 60, the second open passage 62, the third open passage 64, the first communication passage 76, and the second communication passage 78 form a cooling flow passage 80 through which cooling air flows in from the Z1 side of the winding winding portion 18, passes through the inside of the winding winding portion 18, and flows out from the Z2 side of the winding winding portion 18. The cooling flow passage 80 also functions as an insulating layer, which is an air layer.

[0039] As described above in detail, in the first embodiment, an inner ventilation passage 56 (see FIG. 7 ) extending in the Z direction is formed between the stator core 24 and the winding winding portion 18. Therefore, by flowing cooling air through the inner ventilation passage 56, the winding winding portion 18 can be cooled from the inside of the winding winding portion 18 throughout the Z direction. This makes it possible to improve the cooling effect on the winding winding portion 18 compared to, for example, a case in which cooling air is supplied only to the ends of the winding winding portion 18 in the Z direction (i.e., coil ends).

[0040] Furthermore, since the cooling effect on the winding portion 18 can be improved, it is not necessary to increase the thickness of the core sheets, thereby enabling the shaft length of the rotating electric machine M to be shortened.

[0041] The insulating member 30 also has a side insulating portion 32A that insulates the side surface 20A of the tooth portion 20 and a support portion 58 (see FIG. 9 ) that protrudes from the side insulating portion 32A in a tangential direction of the stator core 24. The side insulating portion 42 of the insulating sheet 40 is superimposed on the side insulating portion 32A of the insulating member 30 from the side opposite the side surface 20A of the tooth portion 20, and the support portion 58 also protrudes in the X direction from the side insulating portion 42 of the insulating sheet 40. The support portion 58 supports the winding winding portion 18 from inside the winding winding portion 18. This forms an inner ventilation passage 56 between the side insulating portion 42 and the winding winding portion 18. Therefore, a dedicated member for forming the inner ventilation passage 56 is not required, thereby achieving low costs for the rotating electric machine M.

[0042] Furthermore, since the inner ventilation passage 56 is formed between the side surface insulation portion 42 and the winding winding portion 18, the inner ventilation passage 56 is in direct contact with the winding winding portion 18, and therefore the cooling effect on the winding winding portion 18 can be enhanced compared to, for example, when the inner ventilation passage 56 is formed between the side surface 20A of the tooth portion 20 and the side surface insulation portion 32A.

[0043] Furthermore, the end surface insulating portion 32B and the end surface insulating portion 36B of the first insulating member 30A are formed with a first open path 60 and a second open path 62 (see FIG. 10 ) that are open in the Y direction, and a third open path 64 (see FIG. 10 ) that is open in the Z direction, and the first open path 60, the second open path 62, and the third open path 64 are connected to the inner ventilation path 56. Therefore, the cooling air that flows in from the inlet 15 can flow into the inner ventilation path 56 through the first open path 60, the second open path 62, and the third open path 64. Similarly, the end surface insulating portion 32B and the end surface insulating portion 36B of the second insulating member 30B are formed with a first open path 60 and a second open path 62 (see FIG. 10 ) that are open in the Y direction and a third open path 64 (see FIG. 10 ) that is open in the Z direction, and the first open path 60, the second open path 62, and the third open path 64 are connected to the inner ventilation path 56. Therefore, the cooling air that flows out from the inner ventilation path 56 can flow toward the outlet 17 through the first open path 60, the second open path 62, and the third open path 64. This eliminates the need for dedicated members for introducing cooling air into the inner ventilation path 56 and for discharging cooling air from the inner ventilation path 56, thereby reducing the cost of the rotating electric machine M.

[0044] The insulating member 30 has a side insulating portion 32A that insulates the side surface 20A of the tooth portion 20 and an end surface insulating portion 32B that insulates the end surface 20B of the tooth portion 20, and a first communication passage 76 (see FIG. 13 ) is formed between the end surface insulating portion 32B and the side surface insulating portion 32A in the Z direction. The insulating sheet 40 has a side surface insulating portion 42 that is superimposed on the side surface insulating portion 32A from the side opposite the side surface 20A of the tooth portion 20, and a second communication passage 78 (see FIG. 13 ) is formed between the end surface insulating portion 32B and the side surface insulating portion 42 in the Z direction. The first communication passage 76 and the second communication passage 78 connect the first open path 60, the second open path 62, and the third open path 64 to the inner ventilation passage 56. Therefore, even when the inner ventilation passage 56 is formed between the side insulating portion 42 and the winding winding portion 18, the first open passage 60, the second open passage 62, and the third open passage 64 can be communicated with the inner ventilation passage 56 through the first communication passage 76 and the second communication passage 78. This eliminates the need for dedicated members for communicating the first open passage 60, the second open passage 62, and the third open passage 64 with the inner ventilation passage 56, thereby reducing the cost of the rotating electric machine M.

[0045] In the first embodiment, the stator core 24 is divided into multiple core members 14, and the multiple core members 14 are configured independently of one another. However, the multiple core members 14 may be rotatably connected by a rotary connector with the Z direction as the rotation axis. Furthermore, instead of the multiple core members 14 being rotatably connected by a connector, the multiple insulating members 30 attached to the multiple core members 14 may be rotatably connected by a rotary connector. Furthermore, the multiple core members 14 may be integrally formed, and the multiple insulating members 30 may also be integrally formed. Even with this configuration, the same effects as when the multiple core members 14 and the multiple insulating members 30 are configured independently of one another can be achieved.

[0046] In the first embodiment, the insulator 16 includes a pair of insulating members 30, but one of the pair of insulating members 30 may be omitted. Alternatively, instead of omitting one of the pair of insulating members 30, the pair of insulating sheets 40 may be connected by a connecting portion having the same function as the end surface insulating portions 32B and 36B. The insulator 16 may be configured only with the pair of insulating members 30 without including the pair of insulating sheets 40, or may be configured only with the pair of insulating sheets 40 without including the pair of insulating members 30. Furthermore, when the insulator 16 is configured only with the pair of insulating sheets 40, the pair of insulating sheets 40 may have the same configuration as the end surface insulating portions 32B and 36B of the pair of insulating members 30. An example in which the insulator 16 is configured only with the pair of insulating members 30 without including the pair of insulating sheets 40 will be described in the fifth embodiment.

[0047] In addition, in the first embodiment, the end face insulating portion 32B and the end face insulating portion 36B of the insulating member 30 have a first open path 60, a second open path 62, and a third open path 64, but one or two of the first open path 60, the second open path 62, and the third open path 64 may be omitted.

[0048] Furthermore, in the first embodiment, the insulating sheet 40 has the cutout 74 to form the second communication passage 78 , but instead of the cutout 74 , the insulating sheet 40 may have one or more holes.

[0049] Furthermore, in the first embodiment, the rotating electric machine M may be any type of rotating electric machine M for any purpose, as long as it has a structure in which a pressure difference occurs between the space on the inlet 15 side and the space on the outlet 17 side as the rotating electric machine M operates, thereby forming a cooling air flow in which cooling air flows in from the inlet 15 and flows out from the outlet 17.

[0050] Second Embodiment Next, a second embodiment of the technique of the present disclosure will be described.

[0051] In the second embodiment, the configuration of the insulator 16 is modified as follows compared to the first embodiment. That is, as shown in FIG. 15 , in the second embodiment, the support portion 58 and the opening 72 (see FIG. 8 ) are omitted from the insulating member 30. The side surface insulating portion 32A of the insulating member 30 has a recessed portion 88. The recessed portion 88 is formed on the inner surface of the side surface insulating portion 32A on the side of the side surface 20A of the tooth portion 20 (see FIG. 5 ), and is recessed in the X direction. The recessed portion 88 extends in the Z direction, and forms the inner ventilation passage 56.

[0052] 16 , the inner ventilation passage 56 is formed between the side surface 20A of the tooth portion 20 and the side surface insulating portion 32A. In the second embodiment, the insulator 16 has a first open passage 60, a second open passage 62, and a third open passage 64 (see FIG. 10 ), similar to the first embodiment. The inner ventilation passage 56 communicates with the first open passage 60, the second open passage 62, and the third open passage 64.

[0053] 17 , the inner ventilation passage 56, the first open passage 60, the second open passage 62, and the third open passage 64 form a cooling flow path 90 through which cooling air flows in from the Z1 side of the winding winding portion 18, passes through the inside of the winding winding portion 18, and flows out from the Z2 side of the winding winding portion 18. The cooling flow path 90 also functions as an insulating layer, which is an air layer.

[0054] As described above in detail, also in the second embodiment, an inner ventilation passage 56 (see FIG. 16 ) extending in the Z direction is formed between the stator core 24 and the winding winding portion 18. Therefore, by flowing cooling air through the inner ventilation passage 56, the winding winding portion 18 can be cooled from the inside of the winding winding portion 18 throughout the Z direction. This makes it possible to improve the cooling effect on the winding winding portion 18 compared to, for example, a case in which cooling air is supplied only to the ends of the winding winding portion 18 in the Z direction (i.e., coil ends).

[0055] Furthermore, since the cooling effect on the winding portion 18 can be improved, it is not necessary to increase the thickness of the core sheets, thereby enabling the shaft length of the rotating electric machine M to be shortened.

[0056] Furthermore, the side insulating portion 32A of the insulating member 30 has a recessed portion 88 (see FIG. 15 ), and the inner ventilation passage 56 is formed by the recessed portion 88. Therefore, a dedicated member for forming the inner ventilation passage 56 is not required, and the cost of the rotating electric machine M can be reduced.

[0057] Furthermore, since the inner ventilation passage 56 is formed between the side surface 20A of the tooth portion 20 and the side surface insulation portion 32A, the inner ventilation passage 56 is in indirect contact with the winding winding portion 18 via the side surface insulation portion 32A and the side surface insulation portion 42, and therefore the cooling effect on the winding winding portion 18 is inferior compared to when the inner ventilation passage 56 is in direct contact with the winding winding portion 18. However, for example, by ensuring insulation with the inner ventilation passage 56 as an insulating layer and then reducing the thickness of the side surface insulation portion 32A and the side surface insulation portion 42, a sufficient cooling effect on the winding winding portion 18 can be obtained.

[0058] In the second embodiment, the same modified examples as those in the first embodiment may be adopted for the same configurations as those in the first embodiment.

[0059] Third Embodiment Next, a third embodiment of the technique of the present disclosure will be described.

[0060] In the third embodiment, the configurations of the insulator 16 and the stator core 24 are changed as follows compared to the second embodiment. That is, as shown in Fig. 18 , in the third embodiment, the side surface 20A of the tooth portion 20 has a recessed portion 98 recessed in the X direction. The recessed portion 98 extends in the Z direction, and forms the inner ventilation passage 56. In the third embodiment, the recessed portion 98 is formed in the side surface 20A of the tooth portion 20 instead of the recessed portion 88 (see Fig. 15 ) formed in the side insulating portion 32A of the insulating member 30.

[0061] As shown in Figure 19, in the third embodiment, as in the second embodiment, the inner ventilation passage 56 is formed between the side surface 20A of the tooth portion 20 and the side surface insulating portion 32A. Note that in the third embodiment, the insulator 16 has a first open passage 60, a second open passage 62, and a third open passage 64 (see Figure 10), as in the first and second embodiments. The inner ventilation passage 56 is in communication with the first open passage 60, the second open passage 62, and the third open passage 64.

[0062] In the third embodiment, the inner ventilation passage 56, the first open passage 60, the second open passage 62, and the third open passage 64 form a cooling flow passage 90 (see FIG. 17 ) through which cooling air flows in from the Z1 side of the winding winding portion 18, passes through the inside of the winding winding portion 18, and flows out from the Z2 side of the winding winding portion 18. The cooling flow passage 90 also functions as an insulating layer, which is an air layer.

[0063] As described above in detail, in the third embodiment as well, an inner ventilation passage 56 (see FIG. 19 ) extending in the Z direction is formed between the stator core 24 and the winding winding portion 18. Therefore, by flowing cooling air through the inner ventilation passage 56, the winding winding portion 18 can be cooled from the inside of the winding winding portion 18 throughout the Z direction. This makes it possible to improve the cooling effect on the winding winding portion 18 compared to, for example, a case in which cooling air is supplied only to the ends of the winding winding portion 18 in the Z direction (i.e., coil ends).

[0064] Furthermore, since the cooling effect on the winding portion 18 can be improved, it is not necessary to increase the thickness of the core sheets, thereby enabling the shaft length of the rotating electric machine M to be shortened.

[0065] Furthermore, the side surface 20A of the tooth portion 20 has a recess 98 (see FIG. 18 ), and the inner ventilation passage 56 is formed by the recess 98. Therefore, a dedicated member for forming the inner ventilation passage 56 is not required, and the cost of the rotating electric machine M can be reduced.

[0066] Furthermore, since the inner ventilation passage 56 is formed between the side surface 20A of the tooth portion 20 and the side surface insulation portion 32A, the inner ventilation passage 56 is in indirect contact with the winding winding portion 18 via the side surface insulation portion 32A and the side surface insulation portion 42, and therefore the cooling effect on the winding winding portion 18 is inferior compared to when the inner ventilation passage 56 is in direct contact with the winding winding portion 18. However, for example, by ensuring insulation with the inner ventilation passage 56 as an insulating layer and then reducing the thickness of the side surface insulation portion 32A and the side surface insulation portion 42, a sufficient cooling effect on the winding winding portion 18 can be obtained.

[0067] In the third embodiment, the same modified examples as those in the first embodiment may be adopted for the same configurations as those in the first embodiment.

[0068] Furthermore, in the third embodiment, in addition to the recessed portion 98 being formed on the side surface 20A of the tooth portion 20, the recessed portion 88 (see FIG. 15 ) according to the second embodiment may be formed on the side surface insulating portion 32A of the insulating member 30. The recessed portion 88 and the recessed portion 98 may form the inner ventilation passage 56.

[0069] Fourth Embodiment Next, a fourth embodiment of the technique of the present disclosure will be described.

[0070] In the fourth embodiment, the configuration of the stator 10 is modified as follows compared to the first embodiment. That is, as shown in FIG. 20 , outer-periphery-side ventilation passages 108 located on the outer periphery of the stator core 24 are formed by cutouts 29 formed in the outer surface 22C of the core back portion 22. The outer-periphery-side ventilation passages 108 are an example of the "ventilation passage" according to the technology of the present disclosure. The outer-periphery-side ventilation passages 108 extend in the Z direction.

[0071] The outer opening of the notch 29 in the Y direction is closed by the casing 13. As in the first embodiment, a notch 70 (see also FIG. 21 ) is formed in the end surface insulating portion 36B (i.e., the first end surface insulating portion 36B1) of the first insulating member 30A, and the notch 70 opens the outer periphery-side ventilation passage 108 to the Z1 side. The notch 70 is an example of an "open portion" according to the technology of the present disclosure. On the other hand, the end surface insulating portion 36B (i.e., the second end surface insulating portion 36B2) of the second insulating member 30B does not have a notch 70, and a blocking portion 110 that blocks the ventilation passage is formed in a portion corresponding to the outer periphery-side ventilation passage 108.

[0072] The end surface insulating portion 32B and the end surface insulating portion 36B of the second insulating member 30B (i.e., the second end surface insulating portion 32B2 and the second end surface insulating portion 36B2) have a first open path 120 and a second open path 122. The outer periphery-side ventilation path 108 is connected to the first open path 120 and the second open path 122. The first open path 120 and the second open path 122 formed in the second insulating member 30B function as outlet paths that allow cooling air flowing out from the inner ventilation path 56 to flow toward the outlet 17 (see FIG. 1). Note that the end surface insulating portion 32B and the end surface insulating portion 36B of the first insulating member 30A (i.e., the first end surface insulating portion 32B1 and the first end surface insulating portion 36B1) do not have the first open path 120 and the second open path 122.

[0073] 21 , recesses 66 similar to those in the first embodiment are formed in the end surface insulating portions 32B and 36B of the second insulating member 30B, and a first open path 120 is formed by the recesses 66. Furthermore, openings 68 similar to those in the first embodiment are formed in the end surface insulating portions 32B and 36B of the second insulating member 30B. A second open path 122 is formed by the openings 68.

[0074] In the fourth embodiment, as shown in FIG. 22 , the outer-periphery-side ventilation passage 108, the first open passage 120, and the second open passage 122 form a cooling flow passage 130 through which cooling air flows in from the Z1 side of the winding winding portion 18, passes through the inside of the winding winding portion 18, and flows out from the Z2 side of the winding winding portion 18.

[0075] As described above in detail, in the fourth embodiment, the core back portion 22 has the notch 29 (see FIG. 20 ) that opens outward in the Y direction and penetrates in the Z direction, and the notch 29 forms the outer periphery-side ventilation passage 108 that extends in the Z direction. Therefore, by flowing cooling air through the outer periphery-side ventilation passage 108, the winding winding portion 18 can be cooled throughout the Z direction via the stator core 24. This makes it possible to improve the cooling effect on the winding winding portion 18 compared to, for example, a case in which cooling air is supplied only to the ends (i.e., coil ends) of the winding winding portion 18 in the Z direction.

[0076] Furthermore, since the cooling effect on the winding portion 18 can be improved, it is not necessary to increase the thickness of the core sheets, thereby enabling the shaft length of the rotating electric machine M to be shortened.

[0077] Furthermore, the core back portion 22 has a cutout portion 29, and the outer periphery-side ventilation passage 108 is formed by the cutout portion 29. Therefore, a dedicated member for forming the outer periphery-side ventilation passage 108 is not required, and the cost of the rotating electric machine M can be reduced.

[0078] Furthermore, the end surface insulating portion 36B (i.e., the first end surface insulating portion 36B1) of the first insulating member 30A has a notch 70 that opens the outer-periphery-side ventilation passage 108. Therefore, cooling air can flow into the outer-periphery-side ventilation passage 108 through the notch 70. Furthermore, the end surface insulating portion 36B (i.e., the second end surface insulating portion 36B2) of the second insulating member 30B has a blocking portion 110 that blocks the outer-periphery-side ventilation passage 108. However, the end surface insulating portion 32B and the end surface insulating portion 36B of the second insulating member 30B are formed with a first open passage 120 that opens in the Y direction and a second open passage 122 that opens in the Z direction, and the first open passage 120 and the second open passage 122 are connected to the outer-periphery-side ventilation passage 108. Therefore, cooling air flowing out of the outer-periphery-side ventilation passage 108 can flow toward the outlet 17 through the first open passage 120 and the second open passage 122. This eliminates the need for dedicated components for inflowing cooling air into the outer circumferential ventilation passage 108 and for outflowing cooling air from the outer circumferential ventilation passage 108, thereby enabling the cost of the rotating electric machine M to be reduced.

[0079] Furthermore, because the first open path 120 and the second open path 122 are formed in the end surface insulating portion 32B and the end surface insulating portion 36B of the second insulating member 30B, the Z2 side end (i.e., the coil end) of the winding winding portion 18 can be cooled by the cooling air flowing out from the first open path 120 and the second open path 122. This makes it possible to improve the cooling effect on the winding winding portion 18 compared to, for example, a case in which the outer-periphery-side ventilation path 108 penetrates in the Z direction.

[0080] In the fourth embodiment, the configurations in the first, second, and third embodiments described above may be combined as appropriate.

[0081] In the fourth embodiment, the same modified examples as those in the first embodiment may be adopted for the same configurations as those in the first embodiment.

[0082] Fifth Embodiment Next, a fifth embodiment of the technique of the present disclosure will be described.

[0083] In the fifth embodiment, the configuration of the insulator 16 is changed as follows compared to the first embodiment. That is, as shown in Figures 23 and 24, the insulator 16 does not include the pair of insulating sheets 40 (see Figures 6 and 7), but is composed only of a pair of insulating members 30. The configuration of the pair of insulating members 30 is the same as in the first embodiment.

[0084] In the fifth embodiment, an inner ventilation passage 56 extending in the Z direction is also formed between the stator core 24 and the winding portion 18. Therefore, by flowing cooling air through the inner ventilation passage 56, the winding portion 18 can be cooled from the inside of the winding portion 18 throughout the Z direction. This improves the cooling effect on the winding portion 18 compared to, for example, a case in which cooling air is supplied only to the ends (i.e., coil ends) of the winding portion 18 in the Z direction.

[0085] Furthermore, since the cooling effect on the winding portion 18 can be improved, it is not necessary to increase the thickness of the core sheets, thereby enabling the shaft length of the rotating electric machine M to be shortened.

[0086] Furthermore, an inner ventilation passage 56 is formed between the side insulating portion 32A and the winding winding portion 18. Therefore, a dedicated member for forming the inner ventilation passage 56 is not required, and the cost of the rotating electric machine M can be reduced.

[0087] Furthermore, since the inner ventilation passage 56 is formed between the side insulating portion 32A and the winding winding portion 18, the inner ventilation passage 56 is in direct contact with the winding winding portion 18, and therefore the cooling effect on the winding winding portion 18 can be improved compared to, for example, when the inner ventilation passage 56 is formed between the side surface 20A of the tooth portion 20 and the side insulating portion 32A.

[0088] Furthermore, the insulator 16 does not include a pair of insulating sheets 40 (see FIGS. 6 and 7 ), but is configured only by a pair of insulating members 30. Therefore, compared to when the insulator 16 includes a pair of insulating sheets 40, the configuration of the insulator 16 can be simplified, thereby achieving cost reduction for the rotating electric machine M.

[0089] In the fifth embodiment, the end surface insulating portion 32B of the insulating member 30 has the first open path 120 and the second open path 122, but either the first open path 120 or the second open path 122 may be omitted.

[0090] Furthermore, the fifth embodiment may employ the configurations of the second to fourth embodiments as appropriate.

[0091] The above describes one embodiment of the technology of the present disclosure, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modifications within the scope of the gist of the present disclosure.

[0092] The following are supplementary notes regarding the technology of the present disclosure: (Supplementary Note 1) A stator (10) comprising: a stator core (24), an insulator (16) that insulates the stator core, and a winding winding portion (18) wound around the stator core via the insulator, wherein a ventilation passage (56) extending in the axial direction of the stator core is formed between the stator core and the winding winding portion. (Supplementary Note 2) The stator according to Supplementary Note 1, wherein the stator core has teeth (20) extending radially of the stator core, the teeth have side surfaces (20A) facing tangentially to the stator core, the insulator has side surface insulating portions (32A, 42) that insulate the side surfaces of the teeth, and a support portion (58) that protrudes from the side surface insulating portions in the tangential direction of the stator core and supports the winding winding portion from inside the winding winding portion, and the ventilation passage is formed between the side surface insulating portions and the winding winding portion. (Supplementary Note 3) The stator according to Supplementary Note 1 or Supplementary Note 2, wherein the stator core has teeth portions extending radially of the stator core and core back portions (22) extending circumferentially of the stator core, the teeth portions and the core back portions each have end faces (20B, 22B) facing the axial direction of the stator core, the insulator has end face insulating portions (32B, 36B) that insulate the end faces of the teeth portions and the end faces of the core back portion, and the end face insulating portions have open paths (60, 62, 64) that communicate with the ventilation paths and are open in at least one of the axial and radial directions of the stator core. (Appendix 4) The stator described in Appendix 3, wherein the tooth portion has a side surface facing a tangential direction of the stator core, the insulator has a side surface insulating portion (32A, 42) that insulates the side surface of the tooth portion, and a communication passage (76, 78) that connects the open path and the ventilation path is formed between the end face insulating portion and the side surface insulating portion in the axial direction of the stator core.(Supplementary Note 5) The stator according to Supplementary Note 1 or Supplementary Note 3 dependent on Supplementary Note 1, wherein the stator core has teeth extending in a radial direction of the stator core, the teeth have side surfaces facing a tangential direction of the stator core, the insulator has a side surface insulating portion (32A) that insulates the side surfaces of the teeth, and the ventilation passage is formed between the side surface of the teeth and the side surface insulating portion. (Supplementary Note 6) The stator according to Supplementary Note 5, wherein the side surface insulating portion has a recessed portion (88), and the ventilation passage is formed by the recessed portion. (Supplementary Note 7) The stator according to Supplementary Note 5, wherein a side surface of the tooth portion has a recessed portion (98), and the ventilation passage is formed by the recessed portion. (Appendix 8) A stator comprising: a stator core; an insulator that insulates the stator core; and a winding winding portion wound around the stator core via the insulator, wherein the stator core has a core back portion extending in a circumferential direction of the stator core, the core back portion having a notch (29) that opens radially outward of the stator core and penetrates the stator core in an axial direction, and the notch forms an air passage (108) that extends in the axial direction of the stator core. (Supplementary Note 9) The stator core has teeth extending in the radial direction of the stator core, the teeth and the core back each having an end face facing the axial direction of the stator core, the insulator has end face insulating portions (32B1, 36B1, 32B2, 36B2) that insulate the end faces of the teeth and the end faces of the core back portion, the end face insulating portions have a first end face insulating portion (32B1, 36B1) arranged on one axial side of the stator core and a second end face insulating portion (32B2, 36B2) arranged on the other axial side of the stator core, the first end face insulating portion has an opening portion (70) that opens the ventilation path, and the second end face insulating portion has a closing portion (110) that closes the ventilation path, The stator according to claim 8, wherein the second end surface insulating portion has an open path (120, 122) formed therein, the open path communicating with the ventilation path and opening in at least one of the axial direction and the radial direction of the stator core.(Supplementary Note 10) The stator according to Supplementary Note 1, wherein the stator core has teeth extending in a radial direction of the stator core, the insulators are made of insulating material, the teeth have side surfaces facing a tangential direction of the stator core, the insulating material has side surface insulating parts that insulate the side surfaces of the teeth, and support parts that protrude in the tangential direction of the stator core from the side surface insulating parts and support the winding winding part from inside the winding winding part, and the ventilation passage is formed between the side surface insulating parts and the winding winding part. (Supplementary Note 11) A rotating electric machine (M) comprising: the stator according to any one of Supplementary Note 1 to Supplementary Note 10; and a rotor (11) rotatably accommodated inside the stator core. (Supplementary Note 12) A rotating electric machine according to Supplementary Note 11, comprising: a casing (13) that houses the stator and the rotor, the casing having an inlet (15) located on one axial side of the stator and an outlet (17) located on the other axial side of the stator, and cooling air flows through the ventilation path due to a pressure difference between a space on the inlet side and a space on the outlet side within the casing. (Supplementary Note 13) An insulator that insulates the stator core from a winding winding portion, comprising: a side insulating portion that insulates a side of a tooth portion formed on the stator core, and a support portion that protrudes in a tangential direction of the stator core from the side insulating portion and supports the winding winding portion from inside the winding winding portion, the support portion forming a ventilation path extending in the axial direction of the stator core between the stator core and the winding winding portion. (Supplementary Note 14) An insulator that insulates a stator core from a winding winding portion, the insulator having an insulating member that insulates the tooth portion, the insulating member having a side surface insulating portion that insulates a side surface of the tooth portion, the side surface insulating portion having a recessed portion, the recessed portion forming an air passage extending in an axial direction of the stator core between the stator core and the winding winding portion.(Supplementary Note 15) A stator core around which a winding winding portion is wound via an insulator, the stator core having teeth portions extending in a radial direction of the stator core, the teeth portions having side surfaces facing a tangential direction of the stator core, the side surfaces of the teeth portions having recesses, the recesses forming ventilation passages extending in an axial direction of the stator core between the stator core and the winding winding portion.

Claims

1. A stator (10) comprising: a stator core (24); an insulator (16) that insulates the stator core; and a winding winding portion (18) wound around the stator core via the insulator, wherein an air passage (56) extending in the axial direction of the stator core is formed between the stator core and the winding winding portion.

2. A stator as set forth in claim 1, wherein the stator core has teeth (20) extending radially of the stator core, the teeth have side surfaces (20A) facing tangentially to the stator core, the insulator has side surface insulating portions (32A, 42) that insulate the side surfaces of the teeth, and a support portion (58) that protrudes from the side surface insulating portions in the tangential direction of the stator core and supports the winding winding portion from inside the winding winding portion, and the ventilation passage is formed between the side surface insulating portions and the winding winding portion.

3. A stator as set forth in claim 1 or claim 2, wherein the stator core has teeth portions extending radially of the stator core and core back portions (22) extending circumferentially of the stator core, the teeth portions and the core back portions each have end faces (20B, 22B) facing the axial direction of the stator core, the insulator has end face insulating portions (32B, 36B) that insulate the end faces of the teeth portions and the end faces of the core back portion, and the end face insulating portions have open paths (60, 62, 64) that communicate with the ventilation paths and are open in at least one of the axial and radial directions of the stator core.

4. A stator as described in claim 3, wherein the tooth portion has a side surface facing in the tangential direction of the stator core, the insulator has a side surface insulating portion (32A, 42) that insulates the side surface of the tooth portion, and a communication passage (76, 78) that connects the open path and the ventilation path is formed between the end face insulating portion and the side surface insulating portion in the axial direction of the stator core.

5. A stator as described in claim 1 or claim 3 dependent on claim 1, wherein the stator core has teeth extending radially of the stator core, the teeth have side surfaces facing tangentially to the stator core, the insulator has side insulating portions (32A) that insulate the side surfaces of the teeth, and the ventilation passages are formed between the side surfaces of the teeth and the side insulating portions.

6. A stator according to claim 5, wherein the side insulating portion has a recess (88), and the ventilation passage is formed by the recess.

7. A stator according to claim 5, wherein the side surfaces of the teeth have recesses (98), and the ventilation passages are formed by the recesses.

8. A stator comprising: a stator core; an insulator that insulates the stator core; and a winding winding portion wound around the stator core via the insulator, wherein the stator core has a core back portion extending in the circumferential direction of the stator core, the core back portion having a notch (29) that opens radially outward of the stator core and penetrates the stator core in the axial direction, and the notch forms an air passage (108) that extends in the axial direction of the stator core.

9. The stator core has teeth extending in the radial direction of the stator core, the teeth and the core back each having an end face facing the axial direction of the stator core, the insulator has end face insulating portions (32B1, 36B1, 32B2, 36B2) that insulate the end faces of the teeth and the end faces of the core back, the end face insulating portions have a first end face insulating portion (32B1, 36B1) arranged on one axial side of the stator core and a second end face insulating portion (32B2, 36B2) arranged on the other axial side of the stator core, the first end face insulating portion has an opening portion (70) that opens the ventilation path, and the second end face insulating portion has a closing portion (110) that closes the ventilation path, The stator according to claim 8, wherein the second end surface insulating portion is formed with an open path (120, 122) that communicates with the ventilation path and is open in at least one of the axial direction and the radial direction of the stator core.

10. A stator as described in claim 1, wherein the stator core has teeth extending radially of the stator core, the insulator is made of an insulating material, the teeth have side surfaces facing tangentially to the stator core, the insulating material has side insulating parts that insulate the side surfaces of the teeth and support parts that protrude tangentially from the stator core relative to the side insulating parts and support the winding winding part from inside the winding winding part, and the ventilation passage is formed between the side insulating parts and the winding winding part.

11. A rotating electric machine (M) comprising: a stator according to any one of claims 1 to 10; and a rotor (11) rotatably accommodated inside the stator core.

12. A rotating electric machine as described in claim 11, comprising a casing (13) that houses the stator and the rotor, the casing having an inlet (15) located on one axial side of the stator and an outlet (17) located on the other axial side of the stator, and cooling air flowing through the ventilation passage due to the pressure difference between the space on the inlet side and the space on the outlet side within the casing.

13. An insulator that insulates a stator core from a winding winding portion, comprising: a side insulating portion that insulates the side surfaces of teeth formed on the stator core; and a support portion that protrudes from the side insulating portion in a tangential direction of the stator core and supports the winding winding portion from inside the winding winding portion, wherein the support portion forms an air passage extending in the axial direction of the stator core between the stator core and the winding winding portion.

14. An insulator that insulates a stator core from a winding winding portion, the insulator having an insulating member that insulates the tooth portion, the insulating member having a side insulating portion that insulates a side surface of the tooth portion, the side insulating portion having a recessed portion, the recessed portion forming an air passage extending in the axial direction of the stator core between the stator core and the winding winding portion.

15. A stator core around which a winding winding portion is wound via an insulator, the stator core having teeth extending in a radial direction of the stator core, the teeth having side surfaces facing a tangential direction of the stator core, the side surfaces of the teeth having recesses, the recesses forming ventilation passages extending in the axial direction of the stator core between the stator core and the winding winding portion.

Images