Stator of rotary electric machine

Abstract

To ensure insulation between coil ends adjacent to each other in the circumferential direction of a yoke, while preventing protrusion of an insulation member to the further inside in the radial direction of the yoke than the coil ends.SOLUTION: A protruding wall 60 protrudes from an extension part 47 and is disposed between coil ends 32 adjacent to each other in the circumferential direction of a yoke 16. With this configuration, insulation between the coil ends 32 adjacent to each other in the circumferential direction of the yoke 16 may be ensured by the protruding wall 60. Here, the protruding wall 60 does not protrude from a support part 46 which supports a coil 30 from the inner side in the radial direction of the yoke 16. As a result, insulation between the coil ends 32 adjacent to each other in the circumferential direction of the yoke 16 may be ensured, while preventing protrusion of an insulation member 40 to the further inside in the radial direction of the yoke 16 than the coil ends 32.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a stator of a rotating electrical machine.

Background Art

[0002] For example, as disclosed in Patent Document 1, a stator of a rotating electrical machine includes a stator core and a coil. The stator core has a cylindrical yoke and a plurality of teeth. The plurality of teeth extend from the inner peripheral surface of the yoke radially inward of the yoke. And, slots are formed in the stator core between adjacent teeth in the circumferential direction of the yoke. The coil is formed by winding a winding passing through the slots around each tooth in concentrated winding. The coil includes coil ends protruding from a core end face which is an end face located in the axial direction of the yoke in the stator core. Further, the stator of the rotating electrical machine includes an insulating member. The insulating member is disposed between adjacent coils in the circumferential direction of the yoke within the slot. And, the insulating member insulates between adjacent coils in the circumferential direction of the yoke within the slot.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in such a stator of a rotating electrical machine, in order to reduce the size of the rotating electrical machine in the axial direction, it is conceivable to crush the coil ends. In this case, the adjacent coil ends in the circumferential direction of the yoke approach each other by the amount of crushing the coil ends. Therefore, there is a risk that the insulation distance between adjacent coil ends in the circumferential direction of the yoke cannot be ensured.

[0005] Therefore, as in Patent Document 1, by protruding a part of the insulating member from the core end face of the stator core, it is conceivable to arrange the portion of the insulating member protruding from the core end face between adjacent coil ends in the circumferential direction of the yoke. According to this, the insulation between adjacent coil ends in the circumferential direction of the yoke can be ensured by the portion of the insulating member protruding from the core end face.

[0006] Here, consider the case where the portion of the insulating member protruding from the core end face protrudes radially inward of the yoke more than the coil end. In such a case, for example, when arranging a component radially inward of the yoke more than the coil end, there is a risk that the insulating member may interfere with the component. Thus, if the portion of the insulating member protruding from the core end face protrudes radially inward of the yoke more than the coil end, there is a risk of problems occurring. Therefore, while suppressing the protrusion of the insulating member radially inward of the yoke more than the coil end, it is desired to ensure the insulation between adjacent coil ends in the circumferential direction of the yoke.

Means for Solving the Problem

[0007] The stator of the rotating electrical machine that solves the above problems has a cylindrical yoke and a plurality of teeth extending from the inner peripheral surface of the yoke radially inward of the yoke, and slots are formed between adjacent teeth in the circumferential direction of the yoke. A stator core, a coil formed by winding a winding passing through the slots around each tooth in concentrated winding, and including a coil end protruding from a core end face which is an end face of the stator core located in the axial direction of the yoke, and an insulating member disposed between adjacent coils in the circumferential direction within the slot and insulating between adjacent coils in the circumferential direction. The stator of the rotating electrical machine, wherein the insulating member is disposed radially inward of the coil within the slot and supports the coil from the radially inner side, and an extending portion that extends radially outward from the support portion within the slot and is disposed between adjacent coils in the circumferential direction and insulates between adjacent coils in the circumferential direction. A columnar main body wall having, and a protruding wall protruding from an end face located in the longitudinal direction of the main body wall, the protruding wall protruding from the extending portion and being disposed between adjacent coil ends in the circumferential direction.

[0008] According to this, the protruding wall can ensure insulation between adjacent coil ends in the circumferential direction of the yoke. Here, the protruding wall does not protrude from the support portion that supports the coil from the radially inner side of the yoke. And the protruding wall extends radially outward from the support portion and protrudes from the extending portion disposed between adjacent coils in the circumferential direction of the yoke and is disposed between adjacent coil ends in the circumferential direction of the yoke. Therefore, while suppressing the protrusion of the insulating member radially inward of the yoke more than the coil end, insulation between adjacent coil ends in the circumferential direction of the yoke can be ensured.

[0009] In the stator of the rotating electrical machine, the protruding wall may be plate-shaped and extend in the radial direction between adjacent coil ends in the circumferential direction. According to this, since the protruding wall is plate-shaped and extends in the radial direction of the yoke between coil ends adjacent to each other in the circumferential direction of the yoke, it is possible to easily ensure insulation between coil ends adjacent to each other in the circumferential direction of the yoke by the protruding wall.

[0010] In the stator of the rotating electrical machine, it is preferable that the width in the circumferential direction of the protruding wall is smaller than the width in the circumferential direction of the extending portion. According to this, for example, compared with the case where the width in the circumferential direction of the yoke in the protruding wall is equal to or larger than the width in the circumferential direction of the yoke in the extending portion, the arrangement space of the protruding wall between coil ends adjacent to each other in the circumferential direction of the yoke can be minimized. As a result, since it is possible to easily crush the coil ends, it is possible to easily reduce the axial size of the rotating electrical machine.

[0011] In the stator of the rotating electrical machine, the extending portion extends such that the width in the circumferential direction decreases as it goes from the supporting portion toward the outer side in the radial direction, and the end portion located on the outer side in the radial direction of the extending portion is a narrow-width portion that is the portion where the width in the circumferential direction of the extending portion is the smallest, and it is preferable that the protruding wall protrudes at least from the narrow-width portion.

[0012] In such a configuration, when the coil ends are viewed from the longitudinal direction of the insulating member, among the coil ends adjacent to each other in the circumferential direction of the yoke, the distance between the portions of the coil ends located on both sides with the narrow-width portion interposed therebetween in the circumferential direction of the yoke becomes the closest. Therefore, the protruding wall protrudes at least from the narrow-width portion. According to this, it is possible to ensure insulation between the portions that are closest to each other among the coil ends adjacent to each other in the circumferential direction of the yoke. Therefore, it is possible to more easily ensure insulation between coil ends adjacent to each other in the circumferential direction of the yoke.

Advantages of the Invention

[0013] According to the present invention, it is possible to suppress the protrusion of the yoke radially inward beyond the coil ends in the insulating member, while ensuring insulation between adjacent coil ends in the circumferential direction of the yoke.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0015] Hereinafter, an embodiment in which the stator of a rotating electrical machine is embodied will be described with reference to FIGS. 1 to 6. <Overview of the Rotating Electrical Machine> As shown in FIG. 1, the rotating electrical machine 10 includes a stator 11 and a rotor 12. The stator 11 is cylindrical. The rotor 12 is disposed inside the stator 11. The rotor 12 has a cylindrical rotor core 13 and a plurality of permanent magnets (not shown) embedded in the rotor core 13. The rotor core 13 is fixed to the rotating shaft 14. The rotor core 13 is configured to be rotatable integrally with the rotating shaft 14.

[0016] <Stator> As shown in FIGS. 1 and 2, the stator 11 of the rotating electrical machine 10 includes a stator core 15, a coil 30, an insulating member 40, and a bobbin 50.

[0017] As shown in FIG. 1, the stator core 15 has a cylindrical yoke 16 and a plurality of teeth 17. The plurality of teeth 17 extend radially inward from the inner peripheral surface 16a of the yoke 16. The plurality of teeth 17 are arranged at intervals in the circumferential direction of the yoke 16. Specifically, the plurality of teeth 17 are arranged at equal intervals in the circumferential direction of the yoke 16. Each tooth 17 extends from the inner peripheral surface 16a of the yoke 16 toward the axis L1 of the stator core 15. The tip surface, which is the surface on the side opposite to the yoke 16 in each tooth 17, is an arcuate surface that curves in an arc shape. The tip surfaces of each tooth 17 are located on a concentric circle.

[0018] As shown in FIG. 3, the yoke 16 has yoke end surfaces 16e that are end surfaces respectively located on both axial sides of the yoke 16 in the yoke 16. Each yoke end surface 16e is in a flat surface shape. Each tooth 17 has tooth end surfaces 17e that are end surfaces respectively located on both axial sides of the yoke 16 in the tooth 17. Each tooth end surface 17e is in a flat surface shape. The length of the yoke 16 in the axial direction of the yoke 16 is the same as the length of each tooth 17 in the axial direction of the yoke 16. The yoke end surfaces 16e and each tooth end surface 17e are located on the same plane. The yoke end surfaces 16e and each tooth end surface 17e form core end surfaces 15e that are end surfaces respectively located on both axial sides of the yoke 16 in the stator core 15.

[0019] Each tooth 17 has a tooth extending portion 18 and a pair of tooth flange portions 19. The tooth extending portion 18 extends from the inner peripheral surface 16a of the yoke 16. The tooth extending portion 18 is a portion that extends from the inner peripheral surface 16a of the yoke 16 in the tooth 17. The pair of tooth flange portions 19 project from the tip located at the end on the side opposite to the yoke 16 in the tooth extending portion 18 to both sides in the circumferential direction of the yoke 16.

[0020] In the stator core 15, slots 20 are formed between teeth 17 adjacent to each other in the circumferential direction of the yoke 16. A slot opening 21, which is a gap between the tooth flange portions 19 adjacent to each other in the circumferential direction of the yoke 16, communicates with the slot 20. The slot opening 21 is a space between the tips of the tooth extension portions 18 in the extending direction from the tooth extension portions 18 in the tooth flange portions 19 adjacent to each other in the circumferential direction of the yoke 16.

[0021] As shown in FIG. 4, the tooth extension portion 18 has a tooth side surface 18a. The tooth side surfaces 18a are respectively located on both sides in the circumferential direction of the yoke 16 in the tooth extension portion 18. Each tooth side surface 18a is continuous with the inner peripheral surface 16a of the yoke 16. Each tooth side surface 18a partitions each slot 20. Each tooth flange portion 19 has a tooth flange surface 19a. Each tooth flange surface 19a is continuous with the end portion on the side opposite to the inner peripheral surface 16a of the yoke 16 in the tooth side surface 18a. Each tooth flange surface 19a extends from the tooth side surface 18a to the tip of the tooth flange portion 19. The end portion on the side opposite to the inner peripheral surface 16a of the yoke 16 in the tooth side surface 18a is also the boundary portion 22 between the tooth side surface 18a and the tooth flange surface 19a in the tooth 17. In other words, the end portion on the side opposite to the tip of the tooth flange portion 19 in the tooth flange surface 19a is also the boundary portion 22 between the tooth side surface 18a and the tooth flange surface 19a in the tooth 17. Each tooth flange surface 19a extends in an arcuate curve from the boundary portion 22 and then extends in a flat surface shape to the tip of the tooth flange portion 19. Each tooth flange surface 19a partitions each slot 20. The slot 20 is a space defined by a part of the inner peripheral surface 16a of the yoke 16, the tooth side surface 18a, and the tooth flange surface 19a.

[0022] As shown in FIGS. 1 and 2, the coil 30 is formed by winding the winding 31 passing through the slots 20 around each tooth 17 in concentrated winding. In this way, the coil 30 is wound around the stator core 15. A part of the coil 30 is located inside the slot 20. As shown in FIG. 2, a part of the coil 30 is the coil end 32 protruding from the core end face 15e. Therefore, the coil 30 is formed by winding the winding 31 passing through the slots 20 around each tooth 17 in concentrated winding, and includes the coil end 32 protruding from the core end face 15e of the stator core 15.

[0023] <Bobbin> As shown in FIG. 3, the stator 11 includes two bobbins 50. Each bobbin 50 is disposed opposite to each core end face 15e respectively. The bobbin 50 has a cylindrical yoke cover portion 51, a plurality of tooth cover portions 52, and a plurality of slot insulating portions 53. The yoke cover portion 51 faces the yoke 16 in the axial direction of the yoke 16. The yoke cover portion 51 is in the shape of a thin plate. The yoke cover portion 51 is in the shape of a flat plate. The outer diameter of the yoke cover portion 51 is smaller than the outer diameter of the yoke 16. The inner diameter of the yoke cover portion 51 is the same as the inner diameter of the yoke 16. The yoke cover portion 51 is in surface contact with the yoke end face 16e.

[0024] The plurality of tooth cover portions 52 extend radially inward of the yoke 16 from the inner peripheral edge 51a of the yoke cover portion 51. Each tooth cover portion 52 faces each tooth 17 in the axial direction of the yoke 16 respectively. Each tooth cover portion 52 is in the shape of a thin plate. Each tooth cover portion 52 is in the shape of a flat plate. Each tooth cover portion 52 is in surface contact with the tooth end face 17e of each tooth 17. As shown in FIG. 2, each tooth cover portion 52 insulates between the coil end 32 and the tooth end face 17e.

[0025] As shown in Fig. 3, each slot insulating portion 53 is a thin plate-shaped member that is curved in a substantially U-shape extending along a part of the inner peripheral surface 16a of the yoke 16 forming the slot 20, the tooth side surface 18a, and the tooth flange surface 19a. Each slot insulating portion 53 is continuous with the yoke cover portion 51 and the tooth cover portion 52. Each slot insulating portion 53 extends axially of the yoke 16 from the yoke cover portion 51 and the tooth cover portion 52. The axial length of the yoke 16 in each slot insulating portion 53 is half of the axial length of the yoke 16 in the yoke 16. The slot insulating portions 53 of both bobbins 50 are respectively inserted into the respective slots 20. The tip ends of the slot insulating portions 53 of both bobbins 50 are abutted against each other within the respective slots 20. Thereby, the portion of the coil 30 located within each slot 20 is insulated from the stator core 15 by each slot insulating portion 53.

[0026] <Insulating member> As shown in Figs. 1 and 2, the insulating member 40 includes a main body wall 45 and a protruding wall 60. The insulating member 40 is made of resin. The main body wall 45 of the insulating member 40 is inserted into each slot 20. The main body wall 45 has a triangular prism shape. The main body wall 45 is disposed between adjacent coils 30 in the circumferential direction of the yoke 16 within the slot 20. Therefore, the insulating member 40 is disposed between adjacent coils 30 in the circumferential direction of the yoke 16 within the slot 20. The insulating member 40 insulates between adjacent coils 30 in the circumferential direction of the yoke 16 within the slot 20. The insulating member 40 is disposed within the slot 20 with the longitudinal direction of the main body wall 45 aligned with the axial direction of the yoke 16. Both end portions located on both sides in the longitudinal direction of the main body wall 45 protrude from both core end faces 15e of the stator core 15, respectively. Therefore, the longitudinal length of the main body wall 45 is longer than the axial length of the yoke 16 in the stator core 15.

[0027] As shown in Fig. 4, the main body wall 45 has a first coil support surface 41, a second coil support surface 42, a support surface 43, and an outer peripheral end surface 44. The first coil support surface 41 is a surface located on one side of the coils 30 adjacent in the circumferential direction of the yoke 16 within the slot 20. The second coil support surface 42 is a surface located on the other side of the coils 30 adjacent in the circumferential direction of the yoke 16 within the slot 20.

[0028] The first coil support surface 41 supports one of the coils 30 adjacent in the circumferential direction of the yoke 16 within the slot 20. The first coil support surface 41 is in contact with one of the coils 30 adjacent in the circumferential direction of the yoke 16 within the slot 20. The second coil support surface 42 supports the other of the coils 30 adjacent in the circumferential direction of the yoke 16 within the slot 20. The second coil support surface 42 is in contact with the other of the coils 30 adjacent in the circumferential direction of the yoke 16 within the slot 20.

[0029] The first coil support surface 41 and the second coil support surface 42 support the coils 30 in a state where the coils 30 are arranged radially outside the yoke 16 from the boundary portion 22 of the teeth 17. Therefore, the insulating member 40 supports the coils 30 in a state where the coils 30 are arranged radially outside the yoke 16 from the boundary portion 22 of the teeth 17.

[0030] The support surface 43 connects an end portion located on the side opposite to the inner peripheral surface 16a of the yoke 16 in the first coil support surface 41 and an end portion located on the side opposite to the inner peripheral surface 16a of the yoke 16 in the second coil support surface 42. A part of the support surface 43 extends along the tooth flange surface 19a. The support surface 43 extends within the slot 20 so as to straddle the slot opening 21. The support surface 43 closes the slot opening 21 from the slot 20 side. Therefore, a part of the support surface 43 faces the inside of the slot opening 21. The support surface 43 is supported by each tooth flange portion 19. Therefore, the insulating member 40 is supported by each tooth flange portion 19. And the coils 30 are pressed radially outward of the yoke 16 by the first coil support surface 41 and the second coil support surface 42.

[0031] The outer peripheral end face 44 connects the first coil support face 41 and the second coil support face 42 on the inner peripheral face 16a side of the yoke 16. The outer peripheral end face 44 connects the end portion located on the inner peripheral face 16a side of the yoke 16 in the first coil support face 41 and the end portion located on the inner peripheral face 16a side of the yoke 16 in the second coil support face 42.

[0032] The main body wall 45 has a support portion 46 and an extending portion 47. The support portion 46 is a portion of the main body wall 45 that is located radially inward of the yoke 16 with respect to a virtual straight line L10 that connects the end portions on the support face 43 side in the first coil support face 41 and the end portions on the support face 43 side in the second coil support face 42 at the shortest distance. The support portion 46 is disposed radially inward of the coil 30 in the yoke 16 within the slot 20. The support portion 46 supports the coil 30 from the radially inner side of the yoke 16.

[0033] The extending portion 47 is a portion of the main body wall 45 that is located radially outward of the yoke 16 with respect to the virtual straight line L10 that connects the end portions on the support face 43 side in the first coil support face 41 and the end portions on the support face 43 side in the second coil support face 42 at the shortest distance. The extending portion 47 extends radially outward from the support portion 46 within the slot 20 and is disposed between adjacent coils 30 in the circumferential direction of the yoke 16. The extending portion 47 insulates between adjacent coils 30 in the circumferential direction of the yoke 16.

[0034] The first coil support surface 41 and the second coil support surface 42 each have a curved surface 48a and a straight surface 48b. Each curved surface 48a is continuous with the support surface 43. Each curved surface 48a is a surface that extends in an arc shape that is concave in a direction approaching each other as it separates from the support surface 43. Therefore, the first coil support surface 41 and the second coil support surface 42 extend from the boundary portion 22 of the tooth 17 around which the winding 31 of the corresponding coil 30 is wound, while approaching each other, toward the inner peripheral surface 16a of the yoke 16. Each straight surface 48b is continuous with the end portion of each curved surface 48a on the side opposite to the support surface 43. Each straight surface 48b extends parallel to each other.

[0035] The portion of the extending portion 47 located between the curved surfaces 48a in the circumferential direction of the yoke 16 becomes narrower in the circumferential direction of the yoke 16 as it goes from the support portion 46 toward the outer side in the radial direction of the yoke 16. Therefore, the extending portion 47 extends such that the circumferential width of the yoke 16 becomes narrower as it goes from the support portion 46 toward the outer side in the radial direction of the yoke 16. The portion of the extending portion 47 located between the straight surfaces 48b in the circumferential direction of the yoke 16 has a constant circumferential width of the yoke 16. The portion of the extending portion 47 located between the straight surfaces 48b in the circumferential direction of the yoke 16 is the end portion located on the outer side in the radial direction of the yoke 16 in the extending portion 47. And the end portion located on the outer side in the radial direction of the yoke 16 in the extending portion 47 is a narrow portion 49 which is the portion where the circumferential width of the yoke 16 is the smallest in the extending portion 47.

[0036] <Protruding wall> As shown in FIGS. 5 and 6, the protruding wall 60 protrudes from the end surface located in the longitudinal direction of the main body wall 45. In the present embodiment, the protruding walls 60 protrude from both end surfaces located in the longitudinal direction of the main body wall 45.

[0037] As shown in FIG. 6, the protruding wall 60 protrudes from the extending portion 47. The protruding wall 60 is a portion located between the curved surfaces 48a in the circumferential direction of the yoke 16 in the extending portion 47, and extends in the radial direction of the yoke 16 from the portion located on the outer side in the radial direction of the yoke 16 in the extending portion 47 to the narrow portion 49 in a flat plate shape. The thickness direction of the protruding wall 60 coincides with the circumferential direction of the yoke 16. Most of the protruding wall 60 protrudes from the narrow portion 49.

[0038] As shown in FIG. 5, the protruding wall 60 is disposed between the adjacent coil ends 32 in the circumferential direction of the yoke 16. The protruding wall 60 is in a flat plate shape extending in the radial direction of the yoke 16 between the adjacent coil ends 32 in the circumferential direction of the yoke 16. The protruding length of the protruding wall 60 from the end surface of the main body wall 45 is longer than the protruding length of the coil end 32 from the core end surface 15e of the stator core 15. The protruding wall 60 protrudes to the side opposite to the stator core 15 with respect to the coil end 32.

[0039] As shown in FIG. 6, the circumferential width of the yoke 16 in the protruding wall 60 is smaller than the circumferential width of the yoke 16 in the extending portion 47. Specifically, the circumferential width of the yoke 16 in the protruding wall 60 is smaller than the circumferential width of the yoke 16 in the narrow portion 49 which is the portion where the circumferential width of the yoke 16 is the smallest in the extending portion 47.

[0040] [Operation of the Embodiment] Next, the operation of the embodiment will be described. As shown by the arrows in Fig. 4, in the stator 11 of such a rotating electrical machine 10, there may be a leakage flux φ1 that passes between adjacent coils 30 in the circumferential direction of the yoke 16 from the inner circumferential surface 16a of the yoke 16 and flows toward each tooth collar portion 19 of the teeth 17. At this time, for example, if a part of the coil 30 exists on the tooth collar surface 19a of each tooth collar portion 19, the leakage flux φ1 that passes between adjacent coils 30 in the circumferential direction of the yoke 16 from the inner circumferential surface 16a of the yoke 16 and flows toward the tooth collar portion 19 may flow through the coil 30 existing on the tooth collar surface 19a. Also, as shown by the arrows in Fig. 4, depending on the rotational position of the rotor 12, there may be a leakage flux φ2 that flows from one of the adjacent tooth collar portions 19 in the circumferential direction of the yoke 16 across the slot opening 21 to the other. At this time, for example, if a part of the coil 30 exists on the tooth collar surface 19a of each tooth collar portion 19, the leakage flux φ2 that flows from one of the adjacent tooth collar portions 19 in the circumferential direction of the yoke 16 across the slot opening 21 to the other may flow through the coil 30 existing on the tooth collar surface 19a. Then, eddy currents are generated in the coil 30 existing on the tooth collar surface 19a, so that the coil 30 existing on the tooth collar surface 19a generates heat. When the coil 30 generates heat in this way, the output of the rotating electrical machine 10 decreases.

[0041] Therefore, the insulating member 40 supports the coil 30 in a state where the coil 30 is disposed radially outside the yoke 16 from the boundary portion 22 of the teeth 17. For this reason, a part of the coil 30 does not exist on the tooth collar surface 19a. Accordingly, even if a leakage flux φ1 that passes between adjacent coils 30 in the circumferential direction of the yoke 16 from the inner circumferential surface 16a of the yoke 16 and flows toward the tooth collar portion 19 is generated, it is suppressed that the leakage flux φ1 flows through a part of the coil 30. Also, even if a leakage flux φ2 that flows from one of the adjacent tooth collar portions 19 in the circumferential direction of the yoke 16 across the slot opening 21 to the other is generated, it is suppressed that the leakage flux φ2 flows through a part of the coil 30. As a result, the generation of eddy currents in the coil 30 associated with the leakage fluxes φ1, φ2 is suppressed.

[0042] Incidentally, in the stator 11 of such a rotating electric machine 10, in order to reduce the size of the rotating electric machine 10 in the axial direction, it is conceivable to crush the coil end 32. In this case, the adjacent coil ends 32 in the circumferential direction of the yoke 16 approach each other by the amount of crushing the coil end 32. At this time, the protruding wall 60 protrudes from the extending portion 47 and is disposed between the adjacent coil ends 32 in the circumferential direction of the yoke 16. Therefore, the protruding wall 60 ensures insulation between the adjacent coil ends 32 in the circumferential direction of the yoke 16.

[0043] [Effects of the Embodiment] In the embodiment, the following effects can be obtained. (1) The protruding wall 60 protrudes from the extending portion 47 and is disposed between the adjacent coil ends 32 in the circumferential direction of the yoke 16. According to this, the protruding wall 60 can ensure insulation between the adjacent coil ends 32 in the circumferential direction of the yoke 16. Here, the protruding wall 60 does not protrude from the support portion 46 that supports the coil 30 from the inner side in the radial direction of the yoke 16. And the protruding wall 60 extends from the support portion 46 to the outer side in the radial direction of the yoke 16, protrudes from the extending portion 47 disposed between the adjacent coils 30 in the circumferential direction of the yoke 16, and is disposed between the adjacent coil ends 32 in the circumferential direction of the yoke 16. Therefore, it is possible to suppress the protrusion of the insulating member 40 to the inner side in the radial direction of the yoke 16 more than the coil end 32, while ensuring insulation between the adjacent coil ends 32 in the circumferential direction of the yoke 16.

[0044] (2) Since the protruding wall 60 is plate-shaped and extends in the radial direction of the yoke 16 between the adjacent coil ends 32 in the circumferential direction of the yoke 16, the protruding wall 60 can easily ensure insulation between the adjacent coil ends 32 in the circumferential direction of the yoke 16.

[0045] (3) The circumferential width of the yoke 16 in the protruding wall 60 is smaller than the circumferential width of the yoke 16 in the extending portion 47. According to this, for example, compared with the case where the circumferential width of the yoke 16 in the protruding wall 60 is equal to or greater than the circumferential width of the yoke 16 in the extending portion 47, the arrangement space of the protruding wall 60 between the adjacent coil ends 32 in the circumferential direction of the yoke 16 can be minimized. As a result, the coil ends 32 can be easily crushed, so that it is easy to reduce the axial size of the rotating electrical machine 10.

[0046] (4) The extending portion 47 extends such that the circumferential width of the yoke 16 decreases as it extends from the supporting portion 46 toward the radially outer side of the yoke 16. The end portion located on the radially outer side of the yoke 16 in the extending portion 47 is a narrow portion 49 where the circumferential width of the yoke 16 in the extending portion 47 is the smallest. In such a configuration, when the coil ends 32 are viewed from the longitudinal direction of the insulating member 40, among the adjacent coil ends 32 in the circumferential direction of the yoke 16, the distance between the portions of the coil ends 32 located on both sides with the narrow portion 49 interposed therebetween in the circumferential direction of the yoke 16 is the closest. Therefore, the protruding wall 60 protrudes from the narrow portion 49. According to this, insulation can be ensured between the portions of the adjacent coil ends 32 in the circumferential direction of the yoke 16 that are closest to each other. Therefore, it is possible to more easily ensure insulation between the adjacent coil ends 32 in the circumferential direction of the yoke 16.

[0047] (5) The protruding wall 60 protrudes from the extending portion 47 but not from the supporting portion 46 among the end faces located in the longitudinal direction of the main body wall 45, so that the protrusion of the insulating member 40 radially inward of the yoke 16 is suppressed more than that of the coil ends 32. For this reason, for example, when arranging components radially inward of the yoke 16 than the coil ends 32, it is possible to avoid the protruding wall 60 of the insulating member 40 interfering with the components.

[0048] [Modified Example] Incidentally, the above-described embodiment can be implemented with the following modifications. The above-described embodiment and the following modification examples can be implemented in combination with each other as long as they do not technically conflict with each other.

[0049] ○ In the embodiment, the protruding wall 60 may protrude only from one of both end faces located in the longitudinal direction of the main body wall 45. For example, even if the protruding wall 60 is not arranged between the coil ends 32 adjacent to each other in the circumferential direction of the yoke 16, there may be a case where the insulation distance between the coil ends 32 adjacent to each other in the circumferential direction of the yoke 16 can be ensured. In this case, the protruding wall 60 may not be arranged between the coil ends 32 adjacent to each other in the circumferential direction of the yoke 16.

[0050] ○ In the embodiment, the protruding wall 60 may be, for example, columnar. In short, as long as the protruding wall 60 protrudes from the extending portion 47 and is arranged between the coil ends 32 adjacent to each other in the circumferential direction of the yoke 16, the shape of the protruding wall 60 is not particularly limited.

[0051] ○ In the embodiment, the width of the protruding wall 60 in the circumferential direction of the yoke 16 may be the same as the width of the extending portion 47 in the circumferential direction of the yoke 16. Also, the width of the protruding wall 60 in the circumferential direction of the yoke 16 may be larger than the width of the extending portion 47 in the circumferential direction of the yoke 16.

[0052] ○ In the embodiment, the protruding wall 60 may not protrude to the side opposite to the stator core 15 from the coil end 32. In short, the protruding wall 60 may have any configuration as long as it can ensure insulation between the coil ends 32 adjacent to each other in the circumferential direction of the yoke 16.

[0053] ○ In the embodiment, the protruding wall 60 may be a portion located between the respective curved surfaces 48a in the circumferential direction of the yoke 16 in the extending portion 47, and may not protrude from a portion located outside the yoke 16 in the radial direction of the extending portion 47. For example, it may protrude only from the narrow portion 49. In short, the protruding wall 60 may protrude at least from the narrow portion 49.

[0054] ○ In the embodiment, the insulating member 40 may be configured such that the first coil support surface 41 and the second coil support surface 42 do not extend toward the inner peripheral surface of the yoke 16 while approaching each other from the boundary portion 22 of the teeth 17 around which the winding 31 of the corresponding coil 30 is wound. In short, the insulating member 40 may be configured to support the coil 30 in a state where the coil 30 is disposed radially outside the yoke 16 with respect to the boundary portion 22 of the teeth 17.

[0055] ○ In the embodiment, the main body wall 45 of the insulating member 40 does not have to be triangular prism-shaped. In short, the main body wall 45 of the insulating member 40 only has to be columnar. ○ In the embodiment, the insulating member 40 does not have to support the coil 30 in a state where the coil 30 is disposed radially outside the yoke 16 with respect to the boundary portion 22 of the teeth 17. In short, the insulating member 40 only has to insulate between adjacent coils 30 in the circumferential direction of the yoke 16 within the slot 20.

[0056] ○ In the embodiment, the bobbin 50 may be configured not to have a plurality of slot insulating portions 53. In this case, the stator 11 may be configured to separately include a slot insulating sheet that insulates the portion of the coil 30 located in each slot 20 and the stator core 15 from the bobbin 50.

[0057] [Appendix] The technical idea understood from the above embodiment and modification examples is described below. [Appendix 1] A stator core having a cylindrical yoke and a plurality of teeth extending radially inward from the inner peripheral surface of the yoke, and slots being formed between adjacent teeth in the circumferential direction of the yoke, A coil formed by winding a winding passing through the slot around each tooth in a concentrated winding manner, and including a coil end protruding from a core end surface that is an end surface located in the axial direction of the yoke in the stator core, A stator of a rotating electrical machine, comprising: an insulating member disposed between coils adjacent to each other in the circumferential direction within the slot, and insulating between the coils adjacent to each other in the circumferential direction. The insulating member has a columnar main body wall that is disposed inside the coil in the radial direction within the slot and supports the coil from the inner side in the radial direction, and an extending portion that extends from the support portion to the outer side in the radial direction within the slot and is disposed between the coils adjacent to each other in the circumferential direction and insulates between the coils adjacent to each other in the circumferential direction. and a protruding wall that protrudes from an end face located in the longitudinal direction of the main body wall. The protruding wall protrudes from the extending portion and is disposed between coil ends adjacent to each other in the circumferential direction. A stator of a rotating electrical machine is characterized by this.

[0058] <Appendix 2> The stator of the rotating electrical machine according to <Appendix 1>, wherein the protruding wall is plate-shaped and extends in the radial direction between coil ends adjacent to each other in the circumferential direction.

[0059] <Appendix 3> The stator of the rotating electrical machine according to <Appendix 1> or <Appendix 2>, wherein the width of the protruding wall in the circumferential direction is smaller than the width of the extending portion in the circumferential direction.

[0060] <Appendix 4> The extending portion extends such that the width in the circumferential direction becomes smaller as it goes from the support portion to the outer side in the radial direction. An end portion located on the outer side in the radial direction of the extending portion is a narrow-width portion that is the portion where the width in the circumferential direction is the smallest in the extending portion. The stator of the rotating electrical machine according to any one of <Appendix 1> to <Appendix 3>, wherein the protruding wall protrudes at least from the narrow-width portion.

Explanation of Signs

[0061] 10... Rotating electrical machine, 11... Stator, 15... Stator core, 15e... Core end face, 16... Yoke, 16a... Inner peripheral surface, 17... Teeth, 20... Slots, 30... Coil, 31... Winding, 32... Coil end, 40... Insulating member, 45... Body wall, 46... Support portion, 47... Extending portion, 49... Narrow portion, 60... Protruding wall.

Claims

1. A stator core having a cylindrical yoke and a plurality of teeth extending radially inward from the inner peripheral surface of the yoke, with slots formed between adjacent teeth in the circumferential direction of the yoke; A coil formed by winding a winding passing through the slots around each tooth in concentrated winding, and including coil ends protruding from a core end face which is an end face of the yoke located in the axial direction of the stator core; An insulating member disposed between adjacent coils in the circumferential direction within the slots and insulating between adjacent coils in the circumferential direction, wherein the stator of a rotating electrical machine comprises: The insulating member: A support portion disposed radially inward of the coil within the slot and supporting the coil from the radially inner side, and a columnar main body wall having an extending portion extending radially outward from the support portion within the slot and disposed between adjacent coils in the circumferential direction and insulating between adjacent coils in the circumferential direction; A protruding wall protruding from an end face located in the longitudinal direction of the main body wall; The stator of a rotating electrical machine, wherein the protruding wall protrudes from the extending portion and is disposed between adjacent coil ends in the circumferential direction.

2. The stator of the rotating electrical machine according to claim 1, wherein the protruding wall is plate-shaped and extends in the radial direction between adjacent coil ends in the circumferential direction.

3. The stator of the rotating electrical machine according to claim 1 or claim 2, wherein a circumferential width of the protruding wall is smaller than a circumferential width of the extending portion.

4. The extending portion extends such that a circumferential width thereof decreases as it extends radially outward from the support portion; An end portion located radially outward of the extending portion is a narrow-width portion which is a portion where the circumferential width of the extending portion is the smallest; The stator of the rotating electrical machine according to claim 1, wherein the protruding wall protrudes at least from the narrow-width portion.

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