Stator for rotary electric machine

Abstract

To improve the reliability of a rotary electric machine.SOLUTION: An insulating member 40 has an escape part 65 that avoids contact with a bobbin 50 at a position protruding from a core end face 15e. Therefore, when a winding 31 is wound in a concentrated manner on each tooth 17, load is prevented from being applied from the winding 31 to each of a pair of tooth cover flange parts 55 via the insulating member 40. Thus, cracking of a tooth cover part 52 is prevented.SELECTED DRAWING: Figure 7

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, a coil, an insulating member, and a bobbin. 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 in the diameter direction of the yoke. And, slots are formed in the stator core between the teeth adjacent to each other in the circumferential direction of the yoke. The coil is formed by winding a winding passing through the slot around each tooth in concentrated winding. The coil includes a coil end protruding from a core end face which is an end face located in the axial direction of the yoke in the stator core. The insulating member is disposed between the coils adjacent to each other in the circumferential direction of the yoke within the slot. And, the insulating member insulates between the coils adjacent to each other in the circumferential direction of the yoke within the slot.

[0003] The bobbin is disposed facing the core end face. The core end face has a teeth end face which is an end face located in the axial direction of the yoke in each tooth. The tooth has a tooth extending portion and a pair of tooth flange portions. The tooth extending portion extends from the inner peripheral surface of the yoke. The pair of tooth flange portions protrude from the tooth extending portion to both sides in the circumferential direction of the yoke. The tooth extending portion has a tooth side face located in the circumferential direction of the yoke. The tooth side face partitions the slot. The tooth flange portion has a tooth flange face. The tooth flange face extends from the tooth side face to the tip of the tooth flange portion. The tooth flange face partitions the slot.

[0004] The bobbin has a cylindrical yoke cover portion and a plurality of tooth cover portions. The yoke cover portion faces the yoke in the axial direction of the yoke. The plurality of tooth cover portions extend from the yoke cover portion toward the inner side in the radial direction of the yoke and face the respective teeth in the axial direction of the yoke. The tooth cover portion has a tooth cover extending portion and a pair of tooth cover flange portions. The tooth cover extending portion extends from the yoke cover portion and faces the tooth extending portion in the axial direction of the yoke. The pair of tooth cover flange portions project from the tip end portion, which is an end portion located on the side opposite to the yoke cover portion in the tooth cover extending portion, toward both sides in the circumferential direction of the yoke and face the pair of tooth flange portions in the axial direction of the yoke. The tooth cover portion insulates between the coil end and the tooth end face.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, in the stator of such a rotating electric machine, there may be a case where leakage magnetic flux flows from the inner peripheral surface of the yoke through between adjacent coils in the circumferential direction of the yoke toward each tooth flange portion of the teeth. At this time, for example, it is assumed that a part of the coil exists on the tooth flange surface of each tooth flange portion. In this case, the leakage magnetic flux flowing from the inner peripheral surface of the yoke through between adjacent coils in the circumferential direction of the yoke toward the tooth flange portion may flow through the coil existing on the tooth flange surface. Then, eddy currents are generated in the coil existing on the tooth flange surface, so that the coil existing on the tooth flange surface generates heat. When the coil generates heat in this way, the output of the rotating electric machine decreases.

[0007] Therefore, the insulating member supports the coil in a state where the coil is disposed outside the yoke in the radial direction of the yoke, relative to the boundary between the tooth side surface and the tooth flange surface in the teeth. The insulating member is supported by the tooth flange portion. According to this, a part of the coil does not exist on the tooth flange surface. Therefore, even if leakage magnetic flux that passes between adjacent coils in the circumferential direction of the yoke from the inner circumferential surface of the yoke and flows toward the tooth flange portion is generated, it is suppressed that the leakage magnetic flux flows through a part of the coil. As a result, generation of eddy current in the coil due to the leakage magnetic flux is suppressed.

[0008] Also, in the stator of such a rotating electric machine, when the winding is wound around each tooth in concentrated winding, a load may be applied from the winding to each of the pair of tooth cover flange portions via the insulating member. At this time, since the insulating member supports the coil, a reaction force acting on the insulating member from the winding due to supporting the coil may be applied to each of the pair of tooth cover flange portions via the insulating member. Then, a load is applied from the pair of tooth cover flange portions toward the tip of the tooth cover extending portion. As a result, the tooth cover portion tends to deform such that the pair of tooth cover flange portions approach each other in the circumferential direction of the yoke. At this time, if the tooth cover portion is difficult to deform, there is a risk that the tooth cover portion will crack. If the tooth cover portion cracks, there is a risk that insulation between the coil end and the tooth end face cannot be ensured, resulting in a decrease in the reliability of the rotating electric machine.

Means for Solving the Problem

[0009] The stator of the rotating electrical machine that solves the above problems has a cylindrical yoke and a plurality of teeth extending radially inward from the inner peripheral surface of the yoke. 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 a concentrated winding manner, and including a coil end protruding from a core end face that 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 for insulating between adjacent coils in the circumferential direction, and a bobbin disposed facing the core end face. The core end face has a tooth end face that is an end face of each tooth located in the axial direction. The tooth has a tooth extending portion extending from the inner peripheral surface of the yoke and a pair of tooth flange portions protruding from both sides in the circumferential direction of the yoke from the tooth extending portion. The bobbin has a cylindrical yoke cover portion facing the yoke in the axial direction and a plurality of tooth cover portions extending radially inward from the yoke cover portion and respectively facing each tooth in the axial direction. The tooth cover portion has a tooth cover extending portion extending from the yoke cover portion and facing the tooth extending portion in the axial direction, and a pair of tooth cover flange portions protruding from both sides in the circumferential direction from a tip end portion that is an end portion located on the side opposite to the yoke cover portion in the tooth cover extending portion and respectively facing the pair of tooth flange portions in the axial direction. The tooth cover portion insulates between the coil end and the tooth end face. The tooth extending portion has a tooth side face located in the circumferential direction and partitioning the slot. The tooth flange portion has a tooth flange face extending from the tooth side face to the tip of the tooth flange portion and partitioning the slot. The insulating member supports the coil in a state where the coil is disposed on the outer side in the radial direction than a boundary portion between the tooth side face and the tooth flange face of the tooth, and is supported by the tooth flange portion. The stator of the rotating electrical machine, wherein the insulating member has a relief portion for avoiding contact with the bobbin at a position protruding from the core end face.

[0010] According to this, the insulating member has a relief portion that avoids contact with the bobbin at a position protruding from the core end face. Therefore, when the winding is wound around each tooth in a concentrated winding manner, it is possible to suppress a load from being applied to each of the pair of tooth cover flange portions via the insulating member from the winding. Accordingly, it is possible to suppress the occurrence of cracks in the tooth cover portion, and thus the reliability of the rotating electrical machine can be improved.

[0011] In the stator of the rotating electrical machine, the insulating member has a support surface supported by each of the circumferentially adjacent tooth flange portions in a state of straddling a slot opening that is a gap between the circumferentially adjacent tooth flange portions. A recess is formed in the support surface. The support surface has an opening edge that forms an opening of the recess. Portions located on both sides in the axial direction at the opening edge may be the relief portions.

[0012] According to this, since the insulating member has a recess, the weight of the insulating member can be reduced. And, portions located on both sides in the axial direction of the yoke at the opening edge that forms the opening of the recess are the relief portions. Such a configuration is suitable as a configuration that suppresses a load from being applied to each of the pair of tooth cover flange portions via the insulating member from the winding when the winding is wound around each tooth in a concentrated winding manner while reducing the weight of the insulating member.

[0013] In the stator of the rotating electrical machine, the insulating member preferably has ribs that connect inner surfaces located on both sides in the circumferential direction in the recess. According to this, the rigidity of the insulating member in the circumferential direction of the yoke can be increased as compared with the case where the insulating member does not have ribs. Therefore, even when the insulating member is sandwiched between coils adjacent in the circumferential direction of the yoke in the slot and a load acts on the insulating member from both coils, the original shape of the insulating member is likely to be maintained.

Advantages of the Invention

[0014] According to the present invention, the reliability of a rotating electrical machine can be improved.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0016] Hereinafter, an embodiment in which a stator of a rotating electrical machine is embodied will be described with reference to FIGS. 1 to 7. <Overview of the Rotating Electrical Machine> As shown in FIG. 1, a 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 a rotating shaft 14. The rotor core 13 is configured to be rotatable integrally with the rotating shaft 14.

[0017] <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.

[0018] 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 from the inner peripheral surface 16a of the yoke 16 radially inward 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 the respective teeth 17 are located on a concentric circle.

[0019] 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 tooth 17 in the yoke 16. 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. Thus, the core end surface 15e has the tooth end surface 17e that is the end surface located in the axial direction of the yoke 16 in each tooth 17.

[0020] 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.

[0021] 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 extending portions 18 in the extending direction from the tooth side surfaces 18a in the tooth flange portions 19 adjacent to each other in the circumferential direction of the yoke 16.

[0022] As shown in FIG. 4, the tooth extending 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 extending portion 18. Each tooth side surface 18a is continuous with the inner circumferential 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 circumferential 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 circumferential 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 circumferential surface 16a of the yoke 16, the tooth side surface 18a, and the tooth flange surface 19a.

[0023] As shown in FIGS. 1 and 2, the coil 30 is formed by winding the winding 31 passing through the slot 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 of the core. Therefore, the coil 30 is formed by winding the winding 31 passing through the slot 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.

[0024] <Insulating member> As shown in FIGS. 1 and 2, the insulating member 40 is inserted into each slot 20. Therefore, the insulating member 40 is disposed in each slot 20. The insulating member 40 has a triangular prism shape. The insulating member 40 is made of resin. 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 in the slot 20 with the longitudinal direction of the insulating member 40 coinciding with the axial direction of the yoke 16. Both end portions located on both sides in the longitudinal direction of the insulating member 40 protrude from the respective core end faces 15e of the stator core 15. Therefore, the length in the longitudinal direction of the insulating member 40 is longer than the length in the axial direction of the yoke 16 in the stator core 15.

[0025] As shown in FIG. 4, the insulating member 40 has a first coil support surface 41, a second coil support surface 42, and a support surface 43. The first coil support surface 41 is a surface located on one side of the adjacent coils 30 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 adjacent coils 30 in the circumferential direction of the yoke 16 within the slot 20.

[0026] 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.

[0027] The first coil support surface 41 and the second coil support surface 42 support the coil 30 in a state where the coil 30 is disposed radially outside the yoke 16 than the boundary portion 22 of the teeth 17. Accordingly, the insulating member 40 supports the coil 30 in a state where the coil 30 is disposed radially outside the yoke 16 than the boundary portion 22 of the teeth 17.

[0028] The first coil support surface 41 and the second coil support surface 42 are curved surfaces extending in an arc shape that is recessed in a direction approaching each other. The first coil support surface 41 and the second coil support surface 42 extend toward the inner peripheral surface 16a 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.

[0029] The support surface 43 connects the end portion located on the side opposite to the inner peripheral surface 16a of the yoke 16 on the first coil support surface 41 and the end portion located on the side opposite to the inner peripheral surface 16a of the yoke 16 on the second coil support surface 42. The support surface 43 is rectangular in shape when viewed in plan. A part of the support surface 43 extends along the tooth flange surface 19a. The support surface 43 extends in 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. The support surface 43 is supported by each of the tooth flange portions 19 adjacent in the circumferential direction of the yoke 16 in a state of straddling the slot opening 21. Therefore, the insulating member 40 is supported by each tooth flange portion 19. Thereby, the coil 30 is pressed outward in the radial direction of the yoke 16 by the first coil support surface 41 and the second coil support surface 42.

[0030] <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. 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 form of a thin plate. The yoke cover portion 51 is in the form 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.

[0031] The plurality of tooth cover portions 52 extend radially inward from the inner peripheral edge 51a of the yoke cover portion 51 toward the inside of the yoke 16. Each tooth cover portion 52 faces each tooth 17 in the axial direction of the yoke 16. 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 each tooth end face 17e.

[0032] As shown in FIG. 3, the tooth cover portion 52 has a tooth cover extending portion 54 and a pair of tooth cover flange portions 55. The tooth cover extending portion 54 extends radially inward from the inner peripheral edge 51a of the yoke cover portion 51 toward the inside of the yoke 16. The tooth cover extending portion 54 is a portion that extends radially inward from the inner peripheral edge 51a of the yoke cover portion 51 in the tooth cover portion 52 toward the inside of the yoke 16. The tooth cover extending portion 54 faces the tooth extending portion 18 in the axial direction of the yoke 16. The width of the tooth cover extending portion 54 in the circumferential direction of the yoke 16 is slightly larger than the width of the tooth extending portion 18 in the circumferential direction of the yoke 16.

[0033] The tooth cover extending portion 54 has a tooth cover side edge 54a. The tooth cover side edges 54a are respectively located on both sides in the circumferential direction of the yoke 16 in the tooth cover extending portion 54. Each tooth cover side edge 54a is continuous with the inner peripheral edge 51a of the yoke cover portion 51. Each tooth cover side edge 54a extends along each tooth side surface 18a.

[0034] The pair of tooth cover flange portions 55 project from the tip portion 54e, which is an end portion located on the side opposite to the yoke cover portion 51 in the tooth cover extending portion 54, to both sides in the circumferential direction of the yoke 16. Each tooth cover flange portion 55 projects from each tooth cover side edge 54a in a direction away from each other in the circumferential direction of the yoke 16. The pair of tooth cover flange portions 55 face the pair of tooth flange portions 19 in the axial direction of the yoke 16.

[0035] Each tooth cover flange portion 55 has a tooth cover flange edge 55a. Each tooth cover flange edge 55a is continuous with an end portion on the side opposite to the inner peripheral edge 51a of the yoke cover portion 51 at the tooth cover side edge 54a. Each tooth cover flange edge 55a extends from the tooth cover side edge 54a to the tip of the tooth cover flange portion 55. Each tooth cover flange edge 55a extends along each tooth flange surface 19a.

[0036] Each slot insulating portion 53 is a thin plate-like 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 inner peripheral edge 51a of the yoke cover portion 51, the tooth cover side edge 54a, and the tooth cover flange edge 55a. Each slot insulating portion 53 extends in the axial direction of the yoke 16 from the inner peripheral edge 51a of the yoke cover portion 51, the tooth cover side edge 54a, and the tooth cover flange edge 55a. 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. Each slot insulating portion 53 of both bobbins 50 is inserted into each slot 20 respectively. The tip portions of each slot insulating portion 53 of both bobbins 50 are abutted against each other within each slot 20. Thereby, the portion of the coil 30 located within each slot 20 and the stator core 15 are insulated from each other by each slot insulating portion 53.

[0037] <Recess> As shown in FIGS. 4 and 5, a recess 60 is formed in the support surface 43. The recess 60 has a rectangular hole shape in plan view. Therefore, the support surface 43 has a rectangular frame shape. In plan view, the longitudinal direction of the recess 60 coincides with the longitudinal direction of the insulating member 40. Therefore, the recess 60 extends in the longitudinal direction of the insulating member 40. The recess 60 faces the slot opening 21.

[0038] The support surface 43 has an opening edge 61 that forms the opening of the recess 60. The opening edge 61 has a pair of long edges 62 and a pair of short edges 63. The pair of long edges 62 extends in the longitudinal direction of the support surface 43. The pair of long edges 62 extends parallel to each other. The pair of long edges 62 are portions located on both circumferential sides of the yoke 16 at the opening edge 61. The pair of short edges 63 extends in the transverse direction of the support surface 43. The pair of short edges 63 extends parallel to each other. The pair of short edges 63 are portions located on both axial sides of the yoke 16 at the opening edge 61.

[0039] As shown in FIG. 6, the short edge 63 protrudes from the core end face 15e. Although not shown, both short edges 63 protrude from the respective core end faces 15e. Each short edge 63 is disposed at a position overlapping in the radial direction of the yoke 16 with respect to a pair of tooth cover flange portions 55 of the bobbin 50. The end wall 64 of the insulating member 40 forming each short edge 63 is disposed at a position overlapping in the radial direction of the yoke 16 with respect to the tooth cover flange portion 55.

[0040] <Relief portion> As shown in FIG. 7, each short edge 63 is located outside the yoke 16 in the radial direction than each long edge 62. Each short edge 63 is spaced apart from the tooth cover flange portion 55. Therefore, contact between the bobbin 50 at the position where the insulating member 40 protrudes from the core end face 15e is avoided for each short edge 63. Thus, each short edge 63 forms a relief portion 65 that avoids contact with the bobbin 50 at the position where the insulating member 40 protrudes from the core end face 15e. Therefore, the portions located on both axial sides of the yoke 16 at the opening edge 61 are relief portions 65. In this way, the insulating member 40 has a relief portion 65 that avoids contact with the bobbin 50 at the position where the insulating member 40 protrudes from the core end face 15e.

[0041] <Rib> As shown in FIGS. 5 and 6, the insulating member 40 has a plurality of ribs 66. Each rib 66 connects the inner surfaces 60a located on both circumferential sides of the yoke 16 in the recess 60. The rib 66 is in the shape of a triangular plate. The rib 66 is in the shape of a thin plate. The rib 66 connects the inner surfaces 60a located on both circumferential sides of the yoke 16 in the recess 60 in a state where the thickness direction of the rib 66 coincides with the longitudinal direction of the insulating member 40. The plurality of ribs 66 are arranged at equal intervals in the longitudinal direction of the insulating member 40. Therefore, the interval between adjacent ribs 66 in the longitudinal direction of the insulating member 40 is constant. And the inside of the recess 60 is partitioned into a plurality of spaces 67 in the longitudinal direction of the insulating member 40 by each rib 66. Each space 67 faces the slot opening 21.

[0042] A rib edge 66a, which is an edge on the opening side of the recess 60 in each rib 66, is continuous with the opening edge 61 of the recess 60. Each rib edge 66a is continuous with a pair of long edges 62. Each rib edge 66a is in contact with the slot insulating portion 53 of the bobbin 50.

[0043] [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 case where leakage flux φ1 is generated, which 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, which 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 case where leakage flux φ2 is generated, which flows from one tooth collar portion 19 to the other adjacent tooth collar portion 19 in the circumferential direction of the yoke 16 across the slot opening 21. 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, which flows from one tooth collar portion 19 to the other adjacent tooth collar portion 19 in the circumferential direction of the yoke 16 across the slot opening 21, 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.

[0044] Therefore, the insulating member 40 supports the coil 30 in a state where the coil 30 is disposed radially outside the yoke 16 than 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 leakage flux φ1 is generated, which 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, it is suppressed that the leakage flux φ1 flows through a part of the coil 30. Also, even if leakage flux φ2 is generated, which flows from one tooth collar portion 19 to the other adjacent tooth collar portion 19 in the circumferential direction of the yoke 16 across the slot opening 21, 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 due to the leakage fluxes φ1 and φ2 is suppressed.

[0045] Here, for example, consider a case where the insulating member 40 does not have a relief portion 65 that avoids contact with the bobbin 50 at a position protruding from the core end face 15e. In such a case, when the winding 31 is wound around each tooth 17 in concentrated winding, as indicated by the arrow in FIG. 7, a load F1 may be applied from the winding 31 to each of the pair of tooth cover flange portions 55 via the insulating member 40. Then, a load is applied from the pair of tooth cover flange portions 55 toward the tip end portion 54e of the tooth cover extending portion 54. At this time, since the insulating member 40 supports the coil 30, a reaction force acting on the insulating member 40 from the winding 31 due to supporting the coil 30 in the insulating member 40 may be applied to each of the pair of tooth cover flange portions 55 via the insulating member 40. Therefore, it becomes easier for a load to be applied from the pair of tooth cover flange portions 55 toward the tip end portion 54e of the tooth cover extending portion 54.

[0046] Therefore, in the present embodiment, the insulating member 40 has a relief portion 65 that avoids contact with the bobbin 50 at a position protruding from the core end face 15e. For this reason, when the winding 31 is wound around each tooth 17 in concentrated winding, it is suppressed that a load is applied from the winding 31 to each of the pair of tooth cover flange portions 55 via the insulating member 40. Therefore, it is suppressed that the tooth cover portion 52 cracks.

[0047] [Effects of the Embodiment] In the embodiment, the following effects can be obtained. (1) The insulating member 40 has a relief portion 65 that avoids contact with the bobbin 50 at a position protruding from the core end face 15e. For this reason, when the winding 31 is wound around each tooth 17 in concentrated winding, it can be suppressed that a load is applied from the winding 31 to each of the pair of tooth cover flange portions 55 via the insulating member 40. Therefore, it can be suppressed that the tooth cover portion 52 cracks, so that the reliability of the rotating electric machine 10 can be improved.

[0048] (2) Since the insulating member 40 has the recess 60, the weight of the insulating member 40 can be reduced. And the portions located on both axial sides of the yoke 16 at the opening edge 61 forming the opening of the recess 60 are relief portions 65. Such a configuration is suitable as a configuration for suppressing the load from being applied to each of the pair of tooth cover flanges 55 from the winding 31 via the insulating member 40 when the winding 31 is wound around each tooth 17 in a concentrated winding manner while reducing the weight of the insulating member 40.

[0049] (3) The insulating member 40 has ribs 66 connecting the inner surfaces 60a located on both circumferential sides of the yoke 16 in the recess 60. According to this, the rigidity of the insulating member 40 in the circumferential direction of the yoke 16 can be increased compared to the case where the insulating member 40 does not have the ribs 66. Therefore, even when the insulating member 40 is sandwiched between the coils 30 adjacent in the circumferential direction of the yoke 16 in the slot 20 and a load acts on the insulating member 40 from both coils 30, the original shape of the insulating member 40 is likely to be maintained.

[0050] [Modification Example] Note that the above embodiment can be implemented with the following modifications. The above embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0051] ○ In the embodiment, the insulating member 40 may be configured not to have the ribs 66. ○ In the embodiment, the insulating member 40 may not have the recess 60 and may have a solid structure. Even in this case, the portions located on both axial sides of the yoke 16 on the support surface 43 of the insulating member 40 may be chamfered to have a tapered shape and thus be relief portions 65.

[0052] ○ 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 have any configuration as long as it can support the coil 30 in a state where the coil 30 is disposed radially outside of the yoke 16 than the boundary portion 22 of the teeth 17.

[0053] ○ In the embodiment, the insulating member 40 does not have to be triangular prism-shaped. In short, as long as the insulating member 40 can support the coil 30 in a state where the coil 30 is disposed radially outside of the yoke 16 than the boundary portion 22 of the teeth 17, its shape is not particularly limited.

[0054] ○ 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 from the stator core 15, separately from the bobbin 50.

Description of Reference Numerals

[0055] 10... Rotating electrical machine, 11... Stator, 15... Stator core, 15e... Core end face, 16... Yoke, 16a... Inner peripheral surface, 17... Teeth, 17e... Teeth end face, 18... Teeth extending portion, 18a... Teeth side face, 19... Teeth flange portion, 19a... Teeth flange face, 20... Slot, 21... Slot opening, 22... Boundary portion, 30... Coil, 31... Winding, 32... Coil end, 40... Insulating member, 43... Support surface, 50... Bobbin, 51... Yoke cover portion, 52... Teeth cover portion, 54... Teeth cover extending portion, 54e... Tip portion, 55... Teeth cover flange portion, 60... Recess, 60a... Inner surface, 61... Opening edge, 65... Relief portion, 66... Rib.

Claims

1. A stator core having a cylindrical yoke and a plurality of teeth extending from the inner peripheral surface of the yoke radially inward 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 for insulating between adjacent coils in the circumferential direction; A bobbin disposed opposite to the core end face; and The core end face has tooth end faces which are end faces of the respective teeth located in the axial direction; The teeth have Tooth extending portions extending from the inner peripheral surface of the yoke; and A pair of tooth flange portions protruding from both sides in the circumferential direction of the yoke from the tooth extending portions; The bobbin has A cylindrical yoke cover portion facing the yoke in the axial direction; and A plurality of tooth cover portions extending radially inward from the yoke cover portion and respectively facing the respective teeth in the axial direction; The tooth cover portions have Tooth cover extending portions extending from the yoke cover portion and facing the tooth extending portions in the axial direction; and A pair of tooth cover flange portions protruding from both sides in the circumferential direction from an end portion, which is an end portion on the side opposite to the yoke cover portion in the tooth cover extending portion, and respectively facing the pair of tooth flange portions in the axial direction; The tooth cover portions insulate between the coil ends and the tooth end faces; The tooth extending portions have tooth side faces located in the circumferential direction and partitioning the slots; The tooth flange portions have tooth flange faces extending from the tooth side faces to the tips of the tooth flange portions and partitioning the slots; The insulating member supports the coil in a state where the coil is disposed radially outside of a boundary portion between the tooth side face and the tooth flange face of the tooth, and is a stator of a rotating electric machine supported by the tooth flange portions, The insulating member is characterized by having a relief portion for avoiding contact with the bobbin at a position protruding from the core end face.

2. The insulating member has a support surface supported by respective adjacent tooth flanges in the circumferential direction in a state of straddling a slot opening which is a gap between the adjacent tooth flanges in the circumferential direction. A recess is formed in the support surface. The support surface has an opening edge forming an opening of the recess. The stator of the rotating electrical machine according to claim 1, wherein portions located on both sides in the axial direction at the opening edge serve as the relief portions.

3. The stator of the rotating electrical machine according to claim 2, wherein the insulating member has ribs connecting inner surfaces located on both sides in the circumferential direction in the recess.

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