rotating electrical machines

Abstract

To provide a rotary electric machine which implements improvement of reliability by preventing destruction such as a crack of an insulation bobbin when winding a stator coil.SOLUTION: Insulation bobbins (9a and 9b) mounted to a stator core (5) comprises: a teeth end face opposed part (141) opposed to an end face part of teeth (11) in an axial direction; and teeth side face opposed parts (142a and 142b) opposed to teeth side face parts of the teeth (11) in a circumferential direction. The teeth side face opposed parts (142a and 142b) include: first abutment regions (15a1 and 15b1) abutting on the teeth side face parts; second abutment regions (16a1 and 16b1) abutting on the teeth side face parts radially outside of the first abutment regions (15a1 and 15b1); and intermediate inner wall surface parts (142a1 and 142b1) which are between the first abutment regions (15a1 and 15b1) and the second abutment regions (16a1 and 16b1) and opposed to the teeth side face parts with an interval therebetween.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present application relates to a rotating electric machine. [Background technology]

[0002] As is well known, there exists a rotating electric machine having a freely rotatable rotor and a stator arranged on the outer periphery of the rotor with a gap therebetween, with the stator coil attached to the stator core via an insulating bobbin.

[0003] Conventionally, as an insulating bobbin for the above-mentioned rotating electric machine, a structure consisting of a first insulating bobbin and a second insulating bobbin inserted along the axial direction from both axial end face sides of the stator core has been known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5178935 Summary of the Invention [Problem to be solved by the invention]

[0005] The conventional rotating electric machines described above are manufactured by attaching a first insulating bobbin and a second insulating bobbin to a stator core, and then winding a stator coil around the stator core via the first insulating bobbin and the second insulating bobbin. However, during the process of winding the stator coil around the stator core, excessive stress is applied to the first insulating bobbin and the second insulating bobbin by the stator coil, which can cause cracks to form in the first insulating bobbin and the second insulating bobbin.

[0006] The present application discloses a technique for solving the above-mentioned problems, and aims to provide a rotating electric machine that prevents damage such as cracks in the insulating bobbin when winding the stator coil, thereby improving reliability. [Means for solving the problem]

[0007] The rotating electric machine disclosed in the present application comprises: The rotor is fixed to a rotor shaft that is rotatably supported, and a stator that contains the rotor. the stator includes a stator core and a stator coil attached to the stator core via an insulating bobbin, the stator core is a rotating electric machine including an annular back yoke portion and teeth portions whose tip portions protrude from the back yoke portion toward the rotor shaft, the insulating bobbin is composed of a first insulating bobbin and a second insulating bobbin inserted from both end faces of the stator core in the axial direction of the rotating electric machine, At least one of the first insulating bobbin and the second insulating bobbin has a coil winding portion having a U-shaped cross section around which a conducting wire constituting the stator coil is wound, the coil winding portion has a tooth end face opposing portion opposing an end face portion of the tooth portion in the axial direction, and a tooth side face opposing portion opposing a tooth side face portion of the tooth portion in the circumferential direction of the rotating electric machine, The tooth side surface facing portion has a first contact area that contacts the tooth side surface portion, a second contact area that contacts the tooth side surface portion radially outward of the first contact area of ​​the rotating electric machine, and an intermediate inner wall surface portion that is located between the first contact area and the second contact area and faces the tooth side surface portion with a gap therebetween. It is characterized by:

[0008] Further, the rotating electric machine disclosed in the present application is The rotor is fixed to a rotor shaft that is rotatably supported, and a stator that contains the rotor. the stator includes a stator core and a stator coil attached to the stator core via an insulating bobbin, the stator core is a rotating electric machine including an annular back yoke portion and teeth portions whose tip portions protrude from the back yoke portion toward the rotor shaft, the stator core includes shoe portions at the tip ends of the teeth, the shoe portions extending in the circumferential direction of the rotating electric machine from tooth side surfaces in the circumferential direction of the rotating electric machine, the insulating bobbin is composed of a first insulating bobbin and a second insulating bobbin inserted from both end faces of the stator core in the axial direction of the rotating electric machine, At least one of the first insulating bobbin and the second insulating bobbin has a coil winding portion having a U-shaped cross section around which a conducting wire constituting the stator coil is wound, the coil winding portion has a tooth end face opposing portion opposing the axial end face portion of the tooth portion, a tooth side face opposing portion opposing the tooth side face portion, and a shoe side face opposing inner wall surface portion opposing the circumferential shoe side face portion of the shoe portion, the shoe side-facing inner wall surface portion has a first contact area that contacts the shoe side surface portion, The tooth side surface facing portion has a second contact area that contacts the tooth side surface portion, and an intermediate inner wall surface portion that is located between the first contact area and the second contact area and faces the tooth side surface portion with a gap therebetween. It is characterized by: [Effects of the Invention]

[0009] According to the rotating electric machine disclosed in the present application, it is possible to obtain a rotating electric machine that prevents damage such as cracks in the insulating bobbin when the stator coil is wound, thereby realizing improved reliability. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view showing a rotary electric machine according to a first embodiment, taken along a cross section in a direction perpendicular to an axis. [Figure 2] 2 is a cross-sectional view of the rotating electric machine according to the first embodiment taken along line X1-X1 in FIG. 1 and seen from the direction of the arrows. [Figure 3] 2 is a plan view showing a main part of a stator core in the rotary electric machine according to the first embodiment. FIG. [Figure 4]2 is a perspective view showing a stator core and a first insulating bobbin attached to the stator core in the rotary electric machine according to the first embodiment. FIG. [Figure 5] 5 is a perspective view of a first insulating bobbin in the rotary electric machine according to the first embodiment, as viewed in the direction of arrow A in FIG. 4. FIG. [Figure 6] 5 is a front view of the first insulating bobbin in the rotary electric machine according to the first embodiment, as viewed from the direction of arrow A in FIG. 4. FIG. [Figure 7] 2 is a perspective view showing a first insulating bobbin and a second insulating bobbin attached to a stator core in the rotary electric machine according to the first embodiment. FIG. [Figure 8] 8 is a side view of the first insulating bobbin and the second insulating bobbin attached to the stator core in the rotary electric machine according to the first embodiment, as viewed from the direction of arrow C in FIG. 7. FIG. [Figure 9] 9 is a cross-sectional view of a first insulating bobbin attached to a stator core in the rotary electric machine according to Embodiment 1, taken along line X2-X2 in FIG. 8 and viewed in the direction of the arrows. [Figure 10] FIG. 10 is an enlarged view of a portion Y in FIG. 9. [Figure 11] 10 is a cross-sectional view showing a first insulating bobbin attached to a stator core in a rotating electric machine according to Comparative Example 1. FIG. [Figure 12] 10 is a cross-sectional view showing a first insulating bobbin attached to a stator core in a rotating electric machine according to Comparative Example 2. FIG. [Figure 13] 12 is a cross-sectional view of a first insulating bobbin attached to a stator core in a rotary electric machine according to Comparative Example 1, taken along line X4-X4 in FIG. 11 and viewed from the direction of the arrows. [Figure 14A] 13 is a cross-sectional view of a first insulating bobbin attached to a stator core in a rotary electric machine according to Comparative Example 2, taken along line X5-X5 in FIG. 12 and viewed from the direction of the arrows. [Figure 14B] 13 is a cross-sectional view of a first insulating bobbin attached to a stator core in a rotary electric machine according to Comparative Example 2, taken along line X5-X5 in FIG. 12 and viewed from the direction of the arrows. [Figure 15A]10 is a cross-sectional view of a first insulating bobbin attached to a stator core in the rotary electric machine according to Embodiment 1, taken along line X3-X3 in FIG. 9 and viewed in the direction of the arrows. [Figure 15B] 10 is a cross-sectional view of a first insulating bobbin attached to a stator core in the rotary electric machine according to Embodiment 1, taken along line X3-X3 in FIG. 9 and viewed in the direction of the arrows. [Figure 16] 10 is a cross-sectional view showing a first insulating bobbin attached to a stator core in a rotary electric machine according to a second embodiment. FIG. [Figure 17] 11 is a cross-sectional view showing a first insulating bobbin attached to a stator core in a rotary electric machine according to a third embodiment. FIG. [Figure 18] 10 is a cross-sectional view showing a first insulating bobbin attached to a stator core in a rotary electric machine according to a fourth embodiment. FIG. [Figure 19] FIG. 13 is a perspective view of a first insulating bobbin in a rotary electric machine according to a fifth embodiment. [Figure 20] FIG. 13 is a top view of a stator core in a rotary electric machine according to a sixth embodiment. [Figure 21] FIG. 20 is a perspective view of a first insulating bobbin in a rotary electric machine according to a sixth embodiment. [Figure 22] FIG. 20 is a plan view of a first insulating bobbin in a rotary electric machine according to a sixth embodiment. [Figure 23] 13 is a side view showing a first insulating bobbin and a second insulating bobbin attached to a stator core in a rotary electric machine according to a sixth embodiment. FIG. [Figure 24] 24 is a cross-sectional view of a first insulating bobbin attached to a stator core in a rotary electric machine according to a sixth embodiment, taken along line X6-X6 in FIG. 23 and viewed in the direction of the arrows. [Figure 25] FIG. 13 is a perspective view of a first insulating bobbin in a rotary electric machine according to a seventh embodiment. [Figure 26] 13 is a cross-sectional view showing a first insulating bobbin attached to a stator core in a rotary electric machine according to a seventh embodiment. FIG. [Figure 27] FIG. 13 is a perspective view of a first insulating bobbin in the rotary electric machine according to the eighth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, several embodiments of the present application and several comparative examples will be described, with the same reference numerals indicating the same or corresponding parts. In addition, in the following description, the terms "radial direction," "circumferential direction," "axial direction," "outer diameter side," "inner diameter side," and similar terms are defined based on the rotating electric machine when the member to be described is mounted on the rotating electric machine.

[0012] Embodiment 1 A rotating electric machine according to a first embodiment will be described with reference to the drawings. Fig. 1 is a cross-sectional view of the rotating electric machine according to the first embodiment taken in a direction perpendicular to the axis, and Fig. 2 is a cross-sectional view of the rotating electric machine according to the first embodiment taken along line X1-X1 in Fig. 1 as viewed from the direction of the arrows. In Figs. 1 and 2, the rotating electric machine 1 includes a stator 2 and a rotor 3 inserted into the internal space of the stator 2.

[0013] The stator 2 includes a cylindrical frame 4 having end wall portions 401 at both axial ends, a plurality of stator cores 5 of the same shape fixed to the inner wall surface of the frame 4, and a plurality of stator coils 6 wound around teeth 11 of each stator core 5 via first and second insulating bobbins (described below). Each stator core 5 is formed by stacking a plurality of magnetic steel plates in the axial direction of the rotating electric machine 1.

[0014] A plurality of stator cores 5 of the same shape are aligned in an annular shape while abutting against the back yoke side portions 10c of the back yoke portions 10 of adjacent stator cores 5, and are fixed to the inner peripheral surface portion of the frame 4. A plurality of stator coils 6 wound around the teeth portions 11 of each stator core 5 are arranged at equal intervals in the circumferential direction of the rotating electric machine 1. The respective stator coils 6 are connected to each other, for example, at one axial end or both axial end portions of the stator 2, to form a concentrated winding three-phase stator coil.

[0015] The rotor 3 includes a plurality of field poles (not shown) formed by, for example, permanent magnets fixed to a rotor core, and is fixed to a rotor shaft 7. The rotor shaft 7 is rotatably supported by a pair of bearings (not shown) fixed to a pair of side wall portions 401 of the frame 4.

[0016] When the rotating electric machine 1 operates as an electric motor, a rotational force is generated in the rotor 3 based on the interaction between the rotating magnetic flux generated by passing a current through the stator coil 6 and the magnetic flux generated by the field magnetic poles, causing the rotor 3 to rotate together with the rotor shaft 7. When the rotating electric machine 1 operates as a generator, the rotor 3 is driven to rotate by, for example, an internal combustion engine, and the magnetic flux generated by the field magnetic poles interlinks with the stator coil 6, inducing a voltage in the stator coil 6, and power based on that voltage is output.

[0017] Fig. 3 is a plan view showing a main portion of a stator core in the rotating electric machine according to embodiment 1. In Fig. 3, stator core 5 has back yoke portion 10 and teeth portion 11. Back yoke portion 10 includes back yoke outer peripheral surface portion 10a formed in an arc shape, back yoke inner peripheral surface portion 10b, and a pair of back yoke side surface portions 10c connected to back yoke outer peripheral surface portion 10a and back yoke inner peripheral surface portion 10b. Back yoke cutout portion 12 is provided in back yoke outer peripheral surface portion 10a.

[0018] Teeth 11 extend from back yoke inner peripheral surface 10b of back yoke portion 10 toward the central axis of rotating electrical machine 1, and have a pair of teeth side surfaces 11a, 11b and teeth tip portions 11c that face the peripheral surface of rotor 3 via a gap. Teeth 11 are formed to a width W1 [mm]. Note that shoe portions may be provided on teeth tip portions 11c.

[0019] As described below, the stator coil 6 is wound around the teeth 11 of the stator core 5 via a first insulating bobbin placed on one core end face in the stacking direction of the multiple electromagnetic steel plates that make up the stator core 5, and a second insulating bobbin placed on the other core end face in the stacking direction of the electromagnetic steel plates.

[0020] Figure 4 is an oblique view showing a stator core and a first insulating bobbin attached to the stator core in a rotating electric machine according to embodiment 1, Figure 5 is an oblique view of the first insulating bobbin in the rotating electric machine according to embodiment 1 as viewed from the direction of arrow A in Figure 4, and Figure 6 is a front view of the first insulating bobbin in the rotating electric machine according to embodiment 1 as viewed from the direction of arrow A in Figure 4.

[0021] 4, the first insulating bobbin 9a is attached to the teeth 11 around which the copper wire is wound in the stator core 5. More specifically, the first insulating bobbin 9a is attached to the teeth 11 by inserting the insulating bobbin opening 17 in the first insulating bobbin 9a into the teeth 11 in the direction of arrow B from one core end surface 51 side in the lamination direction of the electromagnetic steel sheets 5a of the stator core 5.

[0022] 4, a second insulating bobbin 9b (described later) having the same configuration as the first insulating bobbin 9a is attached to the teeth 11 of the stator core 5 around which the copper wire is wound. More specifically, the second insulating bobbin 9b is attached to the teeth 11 by inserting the insulating bobbin opening of the second insulating bobbin 9b into the teeth 11 in the opposite direction to the arrow B from the other core end surface 52 side in the lamination direction of the electromagnetic steel sheets 5a of the stator core 5. In this way, the first insulating bobbin 9a is attached to the teeth 11 of the stator core 5 so as to cover one core end surface 51, and the second insulating bobbin 9b is attached to the other core end surface 52.

[0023] 4, 5, and 6, first insulating bobbin 9a includes back yoke end face opposing portion 13 opposing one end face in the stacking direction of back yoke portion 10 of stator core 5, tooth end face opposing portion 141 integrally joined to back yoke end face opposing portion 13 and opposing one end face in the stacking direction of tooth portion 11, tooth side face opposing portion 142a opposing tooth side face portion 11a, and tooth side face opposing portion 142b opposing tooth side face portion 11b. Teeth end face opposing portion 141 and tooth side face opposing portions 142a, 142b form coil winding portion 14 having a U-shaped cross section around which copper wire constituting stator coil 6 is wound.

[0024] The first insulating bobbin 9a also has a first flange 15 formed at one end of the outer surface of the coil winding portion 14 to prevent the stator coil 6 from protruding from the coil winding portion 14, and a second flange 16 formed at the other end of the outer surface of the coil winding portion 14 to prevent the stator coil 6 from protruding from the coil winding portion 14.

[0025] 4, the first flange 15, the outer surface of the coil winding portion 14, the second flange 16, and the surface of the back yoke end face opposing portion 13 on the side opposite the back yoke portion 10 are exposed on the side of the first insulating bobbin 9a opposite the stator core 5. Fillet surfaces 14a and 14b are formed on the outer surface of the coil winding portion 14.

[0026] 6, on the inside of the first insulating bobbin 9a, which is on the stator core 5 side, there are exposed a tooth end face facing surface portion 141a of an area E1 facing the tooth portion 11 of the stator core 5, and a back yoke end face facing surface portion 13a facing the back yoke portion 10 of the stator core 5. The back yoke end face facing portion 13 has a protrusion 131 that protrudes from the back yoke end face facing surface portion 13a facing the back yoke portion 10 of the stator core 5 toward the back yoke portion 10 side.

[0027] The back yoke end face opposing portion 13, the coil winding portion 14, the first flange portion 15, and the second flange portion 16 are integrally formed from an insulating material such as synthetic resin. When the first insulating bobbin 9a is attached to the teeth portion 11, the first flange portion 15 is located on the radially inner side of the rotating electric machine 1, and the second flange portion 16 is located on the radially outer side of the rotating electric machine 1.

[0028] Second flange 16 has back yoke inner peripheral surface opposing portions 162a, 162b formed thereon that face back yoke inner peripheral surface portion 10b of stator core 5. The thickness of back yoke inner peripheral surface opposing portions 162a, 162b is formed to be smaller than the thickness of second flange 16. Back yoke inner peripheral surface opposing portions 162a, 162b are formed so as to protrude perpendicularly from back yoke end face opposing surface portion 13a of back yoke end face opposing portion 13.

[0029] When the first insulating bobbin 9a is attached to the teeth portion 11 of the stator core 5 from one of the core end face portions 51 of the stator core 5, the side portion 131a of the convex portion 131 of the first insulating bobbin 9a is pressed against the side portion 12a of the back yoke cutout portion 12 of the stator core 5, and the back yoke inner surface opposing portions 162a, 162b of the first insulating bobbin 9a are pressed against the back yoke inner surface portion 10b of the stator core 5.

[0030] The aforementioned region E1 inside the first insulating bobbin 9a, facing the tooth portion 11 of the stator core 5, includes a tooth end face facing surface portion 141a facing one core end face portion 51 of the tooth portion 11, an intermediate inner wall surface portion 142a1 facing the tooth side surface portion 11a, and an intermediate inner wall surface portion 142b1 facing the tooth side surface portion 11b.

[0031] Adjacent to the edge of the intermediate inner wall surface portion 142a1 are formed inner wall surface protrusions 15a1 as first contact regions and inner wall surface protrusions 16a1 as second contact regions. Adjacent to the edge of the intermediate inner wall surface portion 142b1 are formed inner wall surface protrusions 15b1 as first contact regions and inner wall surface protrusions 16b1 as second contact regions. A distance W2a [mm] between the opposing inner wall surface protrusions 15a1, 15b1 and a distance W2b [mm] between the opposing inner wall surface protrusions 16a1, 16b1 are formed to be the same dimension.

[0032] The aforementioned intermediate inner wall surface portion 142a1 is formed in the region E2a between the inner wall surface convex portions 15a1 and 16a1, and the aforementioned intermediate inner wall surface portion 142b1 is formed in the region E2b between the inner wall surface convex portions 15b1 and 16b1. These intermediate inner wall surface portions 142a1 and 142b1 face each other with a distance W2c [mm] between them.

[0033] The spacing W2a [mm] between the opposing inner wall surface convex portions 15a1, 15b1, the spacing W2b [mm] between the opposing inner wall surface convex portions 16a1, 16b1, the spacing W2c [mm] between the opposing intermediate inner wall surface portions 142a1, 142b1, and the width W1 [mm] of the teeth portion 11 of the stator core 5 have the following relationship. W2a=W2b W2c>(W2a, W2b) W1≦(W2a, W2b)

[0034] The second insulating bobbin 9b has the same configuration as the first insulating bobbin 9a, and a description thereof will be omitted.

[0035] Fig. 7 is a perspective view showing a first insulating bobbin and a second insulating bobbin attached to a stator core in the rotating electric machine according to the first embodiment, Fig. 8 is a side view of the first insulating bobbin and the second insulating bobbin attached to the stator core in the rotating electric machine according to the first embodiment, as viewed from the direction of arrow C in Fig. 7, showing a state in which the first insulating bobbin 9a is attached to the stator core 5 along the direction of arrow B in Fig. 4, and the second insulating bobbin 9b is attached to the stator core 5 from the opposite direction to arrow B. Fig. 9 is a cross-sectional view of the first insulating bobbin attached to the stator core in the rotating electric machine according to the first embodiment, as viewed from the direction of the arrows along line X2-X2 in Fig. 8, and Fig. 10 is an enlarged view of portion Y in Fig. 9.

[0036] 7, 8, 9, and 10, the first insulating bobbin 9a and the second insulating bobbin 9b are attached to the stator core 5 from both core end surface portions 51, 52 sides of the stator core 5. At this time, the back yoke inner peripheral surface facing portions 162a, 162b of the first insulating bobbin 9a and the second insulating bobbin 9b abut against the back yoke inner peripheral surface portion 10b, and the side surface portion 131a of the convex portion 131 provided on the back yoke end surface facing portion 13 abuts against the side surface portion 12a of the back yoke cutout portion 12 provided on the back yoke outer peripheral surface portion 10a.

[0037] The side surface 131a of the convex portion 131 has an inclined surface, and when the first insulating bobbin 9a and the second insulating bobbin 9b are attached to the stator core 5, the side surface 131a of the convex portion 131 is pressed against the side surface 12a of the back yoke cutout portion 12 in the back yoke portion 10, so that the first insulating bobbin 9a and the second insulating bobbin 9b are securely fixed to the stator core 5.

[0038] 8, tooth side surface portions 11a, 11b and back yoke inner peripheral surface portion 10b are exposed in the range indicated by arrow D in the stacking direction of stator core 5, but to ensure electrical insulation between stator core 5 and stator coil 6, first insulating bobbin 9a and second insulating bobbin 9b may be made longer in the stacking direction of teeth portion 11 than in the case shown in Fig. 7 so as to completely cover tooth side surface portions 11a, 11b. Alternatively, insulating sheets may be attached to the exposed portions of tooth side surface portions 11a, 11b and back yoke inner peripheral surface portion 10b.

[0039] As described above, in the rotating electric machine according to embodiment 1, in the region E1 inside the first insulating bobbin 9a and the second insulating bobbin 9b, inner wall surface convex portions 15a1 and 16a1 are provided adjacent to both sides of the intermediate inner wall surface portion 142a1, and inner wall surface convex portions 15b1 and 16b1 are provided adjacent to both sides of the intermediate inner wall surface portion 142b1, and the inner wall surface convex portions 15a1, 16a1, 15b1, and 16b1 are formed on protrusions extending in the stacking direction of the tooth portion 11.

[0040] Intermediate inner wall surface portion 142a1 sandwiched between inner wall surface convex portions 15a1 and 16a1 is formed as a flat portion recessed from the top surfaces of inner wall surface convex portions 15a1 and 16a1. Similarly, intermediate inner wall surface portion 142b1 sandwiched between inner wall surface convex portions 15b1 and 16b1 is formed as a flat portion recessed from the top surfaces of inner wall surface convex portions 15b1 and 16b1.

[0041] Therefore, when the first insulating bobbin 9a and the second insulating bobbin 9b are attached to the stator core, the tooth side surface portion 11a abuts against the inner wall surface convex portions 15a1 and 16a1, and the tooth side surface portion 11b abuts against the inner wall surface convex portions 15b1 and 16b1, so that in region E2a shown in Figure 6, a space is formed between the intermediate inner wall surface portion 142a1 and the tooth side surface portion 11a, and in region E2b, a space is formed between the intermediate inner wall surface portion 142b1 and the tooth side surface portion 11b.

[0042] Next, in order to clarify the features of the rotating electrical machine according to Embodiment 1, a rotating electrical machine according to a comparative example will be described.

[0043] Comparative Example 1. FIG. 11 is a cross-sectional view showing a first insulating bobbin attached to a stator core in the rotating electrical machine according to Comparative Example 1, and the same or corresponding parts as those in the rotating electrical machine according to Embodiment 1 of the present application are denoted by the same reference numerals. In FIG. 11, the first insulating bobbin 9a according to Comparative Example 1 does not have the aforementioned inner wall surface convex portion provided in the first insulating bobbin 9a in the rotating electrical machine according to Embodiment 1 of the present application, and the intermediate inner wall surface portion recessed from the top surface of the inner wall surface convex portion.

[0044] Other configurations are the same as those of the rotating electrical machine of Embodiment 1. In the following description of Comparative Example 1, the first insulating bobbin 9a will be described, but the same applies to the second insulating bobbin (not shown).

[0045] Generally, since manufactured members or parts always have dimensional tolerances, it is impossible to make the width W1 of the tooth portion 11 of the stator core 5 and the interval W2 between the tooth side surface facing portions 142a and 142b of the first insulating bobbin 9a facing the tooth side surface portions 11a and 11b exactly [W1 = W2]. Therefore, the gap between the tooth side surface portions 11a and 11b and the tooth side surface facing portions 142a and 142b cannot be made "0".

[0046] When [W1>W2], the first insulating bobbin 9a is press-fitted onto the tooth portion 11, and when [W1<W2], the first insulating bobbin 9a is mounted on the tooth portion 11 with a gap. In the first insulating bobbin 9a of Comparative Example 1 shown in FIG. 11, the inner wall surface portions of the tooth side surface facing portions 142a and 142b are not uneven, and the case where [W1>W2] is shown.

[0047] FIG. 13 is a cross-sectional view of a first insulating bobbin attached to a stator core in a rotating electrical machine according to Comparative Example 1, viewed from the direction of the arrow along the line X4-X4 in FIG. 11. In FIG. 13, when the direction indicated by arrow F1 is the tip side of the tooth side facing portions 142a and 142b, and the direction indicated by arrow F2 is the root side of the tooth side facing portions 142a and 142b, when the first insulating bobbin 9a is press-fitted to the tooth portion 11, at the corner G where the root side of the tooth side facing portions 142a and 142b indicated by arrow F2 intersects with the tooth end face facing portion 141, the inner wall surface portions 142a1 and 142b1 of the tooth side facing portions 142a and 142b contact the corner of the tooth portion 11.

[0048] For this reason, starting from the corner G, the first insulating bobbin 9a is bent and deformed in a direction in which the tip sides of the tooth side facing portions 142a and 142b indicated by arrow F1 are separated from the tooth side surface portions 11a and 11b, and a large tensile stress is applied to the root side of the tooth side facing portions 142a and 142b indicated by arrow F2 at the corner G.

[0049] Furthermore, during winding of the coil, a circumferential load is applied to the fillet surfaces 14a and 14b of the coil winding portion 14 and the outer surfaces of the tooth side facing portions 142a and 142b, the amount of bending deformation of the first insulating bobbin 9a increases, and the tensile stress on the first insulating bobbin 9a increases. Therefore, particularly near the center of the coil winding portion 14, there are no first flange portions 15 and second flange portions 16 and the rigidity is low, so cracks may occur in the root portion of the tooth side facing portions 142a and 142b indicated by arrow F2.

[0050] Comparative Example 2. FIG. 12 is a cross-sectional view showing a first insulating bobbin attached to a stator core in a rotating electrical machine according to Comparative Example 2. In the first insulating bobbin 9a of Comparative Example 2, there are no irregularities on the inner wall surface portions 142a1 and 142b1 of the tooth side facing portions 142a and 142b, and [W1 < W2]. Other configurations are the same as those in Comparative Example 1.

[0051] 14A and 14B are cross-sectional views of a first insulating bobbin attached to a stator core in a rotating electric machine according to Comparative Example 2, viewed from the direction of the arrows along line X5-X5 in Fig. 12. In Comparative Example 2, first insulating bobbin 9a is attached to tooth portion 11 with gaps between tooth side surface portions 11a, 11b and inner wall surface portions 142a1, 142b1 of tooth side surface opposing portions 142a, 142b. Therefore, as shown in Fig. 14A, when first insulating bobbin 9a is attached to tooth portion 11, the base sides of tooth side surface opposing portions 142a, 142b, as indicated by arrow F2, do not come into contact with tooth side surface portions 11a, 11b, and therefore no tensile stress is applied to corners G.

[0052] However, there is a circumferential clearance H between the tooth side surface portions 11a, 11b and the intermediate inner wall surface portions 142a1, 142b1 of the tooth side surface opposing portions 142a, 142b, and the intermediate inner wall surface portions 142a1, 142b1 do not have the inner wall surface convex portions 15a1, 15b1, 16a1, 16b1 as in the above-mentioned first embodiment. Therefore, when winding the coil, a circumferential load is applied to the fillet surfaces 14a, 14b of the first insulating bobbin 9a and the outer surfaces of the tooth side surface opposing portions 142a, 142b.

[0053] As a result, for example, as shown in Figure 14B, coil winding portion 14 is shifted overall in the circumferential direction indicated by arrow J, and at corner G where the root side of tooth side surface facing portion 142b and tooth end face facing portion 141 intersect, the inner wall surface of coil winding portion 14 comes into contact with tooth side surface portion 11b, and the tip end of tooth side surface facing portion 142b is bent and deformed in a direction away from tooth side surface portion 11b, starting from the root portion of tooth side surface facing portion 142b.

[0054] Therefore, a large tensile stress is applied to the corners G of the coil winding portion 14, and since the coil winding portion 14, particularly near the center, has low rigidity due to the absence of the first flange portion 15 and the second flange portion 16, there is a possibility that cracks will occur on the base side of the tooth side surface opposing portion 142b.

[0055] The rotating electric machine of Comparative Example 1 and the rotating electric machine of Comparative Example 2 have been described above, but the rotating electric machine according to Embodiment 1 can solve the above-mentioned problems of the rotating electric machines of Comparative Example 1 and Comparative Example 2. Figures 15A and 15B are cross-sectional views of a first insulating bobbin attached to a stator core in the rotating electric machine according to Embodiment 1, taken along line X3-X3 in Figure 9, as viewed from the direction of the arrows.

[0056] In contrast to the rotating electric machines of Comparative Example 1 and Comparative Example 2, in the rotating electric machine of embodiment 1, as shown in Figures 9, 10, 15A, and 15B, in the first insulating bobbin 9a and the second insulating bobbin 9b, a space portion serving as a clearance is formed between the intermediate inner wall surface portions 142a1, 142b1 and the tooth side surface portions 11a, 11b.Therefore, even if the stator coil 6 is wound around the tooth portion 11 via the first insulating bobbin 9a and the second insulating bobbin 9b, no tensile stress is applied to the first insulating bobbin 9a and the second insulating bobbin 9b.

[0057] Furthermore, when winding the stator coil 6, even if a circumferential load is applied to the tooth side surface opposing portions 142a, 142b of the first insulating bobbin 9a and the second insulating bobbin 9b and the coil winding portion 14 as a whole shifts circumferentially relative to the tooth portion 11, the inner wall surface convex portions 15a1, 16a1 abut against the tooth side surface portion 11a, and the inner wall surface convex portions 15b1, 16b1 abut against the tooth side surface portion 11b, and the circumferential positions of the first insulating bobbin 9a and the second insulating bobbin 9b are regulated, so the space between the intermediate inner wall surface portions 142a1, 142b1 and the tooth side surface portions 11a, 11b is reliably maintained.

[0058] Generally, resin materials have a characteristic that their compressive strength is greater than their tensile strength, and therefore, a resin material that is configured to generate compressive stress rather than tensile stress is less likely to crack or otherwise be damaged. In the rotating electric machine according to the first embodiment, for example, when first insulating bobbin 9a and second insulating bobbin 9b made of a resin material are attached to stator core 5 as described above and stator coil 6 is wound around them, a space is reliably maintained between tooth side surfaces even at intermediate inner wall surface portions 142a1 and 142b1 located near the center of coil winding portion 14, which has low rigidity, between first flange portion 15 and second flange portion 16.

[0059] Therefore, even if a circumferential load is applied to the fillet surfaces 14a, 14b and tooth side surface opposing portions 142a, 142b of the tooth end face opposing portion 141 when winding the stator coil 6, the displacement of the coil winding portion 14 is firmly restricted by the inner wall surface convex portions 15a1, 15b1 arranged at a position corresponding to the highly rigid first flange portion 15, and the inner wall surface convex portions 16a1, 16b1 arranged at a position corresponding to the highly rigid second flange portion 16.

[0060] Therefore, starting from the corner G, the tip ends of the tooth side surface opposing portions 142a, 142b are not bent in a direction away from the tooth side surface portions 11a, 11b, but are bent in a direction approaching the tooth side surface portions 11a, 11b, causing compressive stress at the corner G, which prevents cracks from occurring at the corner G of the coil winding portion 14 and improves the reliability of the insulation between the stator coil 6 and the stator core 5.

[0061] In the rotating electric machine according to this embodiment 1, the first insulating bobbin 9a and the second insulating bobbin 9b are both described as having the same configuration to prevent cracks from occurring. However, in cases where there is a difference in the likelihood of cracks occurring between the first insulating bobbin 9a and the second insulating bobbin 9b, such as when the first insulating bobbin 9a and the second insulating bobbin 9b have different rigidities or when the stress applied by the stator coil 6 differs, or when one of the first insulating bobbin 9a and the second insulating bobbin 9b has a different configuration from the other to reduce the likelihood of cracks occurring, the above-mentioned configuration may be adopted, as appropriate, only for the insulating bobbin that is relatively more likely to have cracks occurring.

[0062] Embodiment 2 16 is a cross-sectional view showing a first insulating bobbin attached to a stator core in a rotating electric machine according to embodiment 2, and parts that are the same as or correspond to those in the rotating electric machine according to embodiment 1 are given the same reference numerals. In the description of the rotating electric machine according to embodiment 2, only the differences from the rotating electric machine according to embodiment 1 will be described. As shown in FIG. 16, a shoe portion 111 extending in the circumferential direction is provided at the radial tip of each tooth portion 11.

[0063] The first insulating bobbin 9a is provided with shoe side surface facing inner wall surface portions 151a, 151b that face across a gap from the shoe side surface portions 111a, 111b of the shoe portion 111 on the inner surface of the first flange portion 15. In addition, inner wall surface convex portions 15a1, 16a1 are provided adjacent to the intermediate inner wall surface portion 142a1, and inner wall surface convex portions 15b1, 16b1 are provided adjacent to the intermediate inner wall surface portion 142b1.

[0064] The side surface of the shoe portion 111 of the tooth portion 11 and the inner wall surface portions 151a, 151b facing the shoe side surface are spaced apart in the circumferential direction via a gap. When the first insulating bobbin 9a and the second insulating bobbin 9b are attached to the stator core 5, and when the stator coil 6 is wound around the tooth portion 11 via the first insulating bobbin 9a and the second insulating bobbin 9b, the inner wall surface protrusions 15a1, 16a1, 15b1, 16b1 abut against the tooth side surface portions 11a, 11b, and the side surface of the shoe portion 111 of the tooth portion 11 and the inner wall surface portions 151a, 151b facing the shoe side surface are maintained apart. The second insulating bobbin 9b (not shown) has the same configuration as the first insulating bobbin 9a. The other configurations are the same as those of the rotating electric machine according to the first embodiment.

[0065] According to the rotating electric machine of embodiment 2, the tooth portion 11 is provided with a shoe portion 111, but the intermediate inner wall surface portions 142a1, 142b1 reliably maintain circumferential space relative to the tooth side surface portions 11a, 11b, so that the same effect as in embodiment 1 can be obtained.

[0066] Embodiment 3 17 is a cross-sectional view showing a first insulating bobbin attached to a stator core in a rotating electric machine according to embodiment 3, and parts that are the same as or correspond to those in the rotating electric machine according to embodiment 2 are given the same reference numerals. In the description of the rotating electric machine according to embodiment 3, only the differences from the rotating electric machine according to embodiment 2 will be described. As shown in FIG. 17, in the rotating electric machine according to embodiment 3, shoe portions 111 extending in the circumferential direction are provided at the radial tips of the tooth portions 11, as in the rotating electric machine according to embodiment 2.

[0067] The first insulating bobbin 9a has shoe side surface facing inner wall surface portions 151a, 151b that face the shoe side surface portions 111a, 111b of the shoe portion 111 on the inner surface portion of the first flange portion 15. Also, inner wall surface convex portions 16a1, 16b1 are provided adjacent to the intermediate inner wall surface portions 142a1, 142b1, respectively, on the inner surface portion corresponding to the back yoke inner peripheral surface facing portions 162a, 162b. The second insulating bobbin 9b (not shown) has the same configuration as the first insulating bobbin 9a. The other configurations are the same as those of the rotating electric machine according to the second embodiment.

[0068] In the rotating electric machine according to the third embodiment, shoe-side-facing inner wall surface portions 151a, 151b abut against shoe side surface portions 111a, 111b, and inner wall surface protrusions 16a1, 16b1 abut against tooth side surface portions 11a, 11b, thereby maintaining a space between intermediate inner wall surface portions 142a1, 142b1 and tooth side surface portions 11a, 11b in region E3. With this configuration, even if tooth portion 11 is provided with shoe portion 111, the space between intermediate inner wall surface portions 142a1, 142b1 and tooth side surface portions 11a, 11b is reliably maintained, thereby achieving the same effect as in the first embodiment.

[0069] Embodiment 4 FIG. 18 is a cross-sectional view showing a first insulating bobbin mounted on a stator core in a rotating electric machine according to the fourth embodiment, in which parts that are the same as or correspond to those in the rotating electric machine according to the first embodiment are assigned the same reference numerals. In the description of the rotating electric machine according to the fourth embodiment, only differences from the rotating electric machine according to the first embodiment will be described. In the rotating electric machine according to the fourth embodiment, no inner wall surface convex portions are provided on the inner wall surfaces of the tooth side surface opposing portions 142a, 142b of the first insulating bobbin 9a. Instead, tooth side surface convex portions 11a1, 11b1 are provided on the inner diameter sides of the tooth side surface portions 11a, 11b, and tooth side surface convex portions 11a2, 11b2 are provided on the outer diameter sides of the tooth side surface portions 11a, 11b. The configuration of the second insulating bobbin 9b (not shown) is the same as that of the first insulating bobbin 9a. The other configurations are the same as those of the rotating electric machine according to the first embodiment.

[0070] According to the rotating electric machine of this embodiment 4, in the region E4 between the tooth side surface convex portions 11a1, 11b1 on the inner diameter side of the tooth portion 11 and the tooth side surface convex portions 11a2, 11b2 on the outer diameter side of the tooth portion 11, a gap is formed between the tooth side surface portions 11a, 11b and the intermediate inner wall surface portions 142a1, 142b1.

[0071] When the first insulating bobbin 9a and the second insulating bobbin 9b are attached to the stator core 5, and when the stator coil 6 is wound onto the tooth portion 11 via the first insulating bobbin 9a and the second insulating bobbin 9b, the tooth side surface convex portions 11a1, 11b1, 11a2, 11b2 abut against the inner wall surface of the coil winding portion 14, and a space is reliably maintained between the tooth side surface portions 11a, 11b and the intermediate inner wall surface portions 142a1, 142b1, thereby achieving the same effect as in embodiment 1.

[0072] Although not shown, when shoe portions are provided at the tips of the teeth 11, inner wall surfaces facing the shoe side surfaces may be provided on the inner walls of the first insulating bobbin and the second insulating bobbin, and the inner wall surfaces facing the shoe side surfaces may be in contact with the shoe side surfaces, as in the case of embodiment 3. Alternatively, instead of the inner wall surfaces facing the shoe side surfaces being in contact with the shoe side surfaces, a space may be maintained between the side surfaces of the shoe portions and the inner wall surfaces of the first insulating bobbin and the second insulating bobbin by abutting the convex portions on the tooth side surfaces with the inner wall surfaces of the coil winding portion.

[0073] Embodiment 5. FIG. 19 is a perspective view of a first insulating bobbin in a rotating electric machine according to the fifth embodiment. Parts that are the same as or correspond to those in the rotating electric machine according to the first embodiment are assigned the same reference numerals. In the description of the rotating electric machine according to the fifth embodiment, only differences from the rotating electric machine according to the first embodiment will be described. In the rotating electric machine according to the fifth embodiment, inclined surfaces 142as and 142bs are provided on the tip side, indicated by arrow F1, of inner wall surface convex portions 15a1, 15b1, 16a1, and 16b1 and intermediate inner wall surface portions 142a1 and 142b1 in the first insulating bobbin 9a. The configuration of the second insulating bobbin 9b (not shown) is the same as that of the first insulating bobbin 9a. The other configurations are the same as those of the rotating electric machine according to the first embodiment.

[0074] According to the rotating electric machine of embodiment 5, it is possible to obtain the same effects as the rotating electric machine of embodiment 1, and in addition, the first insulating bobbin 9a and the second insulating bobbin 9b can be easily inserted into the tooth portion 11 of the stator core 5, thereby improving the ease of attachment of the first insulating bobbin 9a and the second insulating bobbin 9b to the stator core 5.

[0075] In Figure 19, the inclined surfaces 142as and 142bs are provided only on the tip side indicated by arrow F1 inside the coil winding portion 14, but they may also be inclined surfaces that gradually change in a direction away from the tooth side portions 11a and 11b from the base side indicated by arrow F2 to the tip side.

[0076] Embodiment 6 Fig. 20 is a top view of a stator core in a rotating electric machine according to embodiment 6, Fig. 21 is a perspective view of a first insulating bobbin in the rotating electric machine according to embodiment 6, Fig. 22 is a plan view of the first insulating bobbin in the rotating electric machine according to embodiment 6, Fig. 23 is a side view showing the first insulating bobbin and the second insulating bobbin attached to the stator core in the rotating electric machine according to embodiment 6, and Fig. 24 is a cross-sectional view of the first insulating bobbin attached to the stator core in the rotating electric machine according to embodiment 6, as viewed from the direction of the arrows along line X6-X6 in Fig. 23, where parts that are the same as or correspond to those in the rotating electric machine according to embodiment 1 are given the same reference numerals. In the description of the rotating electric machine according to embodiment 6, only the differences from the rotating electric machine according to embodiment 1 will be described.

[0077] 20 , unlike the first embodiment, stator core 5 of the rotating electric machine according to the sixth embodiment does not include back yoke cutouts 12 on back yoke outer peripheral surface portion 10a. In stator core 5 according to the sixth embodiment, tooth cutouts 115a are formed on the outer diameter side of tooth side surface portion 11a so as to contact back yoke inner peripheral surface portion 10b, and tooth cutouts 115b are formed on the outer diameter side of tooth side surface portion 11b so as to contact back yoke inner peripheral surface portion 10b. Width K2 [mm] between tooth cutouts 115a and tooth cutouts 115b and circumferential width K1 [mm] of teeth portion 11 have a relationship of [K1 > K2].

[0078] 21 and 22, the first insulating bobbin 9a in the rotating electric machine according to the sixth embodiment does not include the convex portion 131 that is provided on the back yoke end face opposing portion 13 of the first insulating bobbin 9a in the first embodiment. The first insulating bobbin 9a in the sixth embodiment has inner wall surface convex portions 15a1 and 16a1 that are in contact with the intermediate inner wall surface portion 142a1 on the inside of the first insulating bobbin 9a, and also has inner wall surface convex portions 15b1 and 16b1 that are in contact with the intermediate inner wall surface portion 142b1. The second insulating bobbin 9b (not shown) has a configuration similar to that of the first insulating bobbin 9a.

[0079] The distance K3 [mm] between the inner wall surface convex portions 15a1 and 15b1, the distance K4 [mm] between the intermediate inner wall surface portions 142a1 and 142b1, and the distance K5 [mm] between the inner wall surface convex portions 16a1 and 16b1 have the relationship of [K5 < K3 < K4]. Further, regarding the widths of the teeth portion 11 of the stator core 5 and the first insulating bobbin 9a, they have the relationships of [K1 ≦ K3] and [K2 ≦ K5].

[0080] As shown in FIG. 23, the first insulating bobbin 9a and the second insulating bobbin 9b are attached to the stator core 5 from both sides in the stacking direction of the stator core 5. When attaching them, as shown in FIG. 24, the inner wall surface convex portion 16a1 is press-fitted into the tooth notch portion 115a, and the inner wall surface convex portion 16b1 is press-fitted into the tooth notch portion 115b, so that the first insulating bobbin 9a and the second insulating bobbin 9b are fixed to the stator core 5.

[0081] According to the rotating electric machine according to Embodiment 6, similar to the rotating electric machine according to Embodiment 1, when winding the coil, even if the entire coil winding portion 14 in the first insulating bobbin 9a and the second insulating bobbin 9b is displaced in the circumferential direction, the inner wall surface convex portions 15a1, 15b1, 16a1, and 16b1 abut against the tooth side surface portions 11a and 11b, and a circumferential space is surely maintained between the intermediate inner wall surface portions 142a1 and 142b1 and the tooth side surface portions 11a and 11b. Therefore, the same effect as in Embodiment 1 can be obtained. Further, by press-fitting the inner wall surface convex portion 16a1 into the tooth notch portion 115a and the inner wall surface convex portion 16b1 into the tooth notch portion 115b, the first insulating bobbin 9a and the second insulating bobbin 9b can be more surely fixed to the stator core 5.

[0082] Embodiment 7. FIG. 25 is a perspective view of the first insulating bobbin in the rotating electric machine according to Embodiment 7, and FIG. 26 is a cross-sectional view showing the first insulating bobbin attached to the stator core in the rotating electric machine according to Embodiment 7. The same reference numerals are given to the same or corresponding parts as those in the rotating electric machine of Embodiment 1. In the description of the rotating electric machine according to Embodiment 5, only the points different from the rotating electric machine according to Embodiment 1 will be described.

[0083] In Figure 25, the first insulating bobbin 9a has an inner wall surface groove 18a having a fillet surface 18a1 at the base portion indicated by arrow F2 in the inner wall surface convex portions 15a1, 16a1 and intermediate inner wall surface portion 142a1, and an inner wall surface groove 18b having a fillet surface 18b1 at the base portion indicated by arrow F2 in the inner wall surface convex portions 15b1, 16b1 and intermediate inner wall surface portion 142b1.

[0084] 26, inner wall surface groove 18a having fillet surface 18a1 is formed in an inner portion of first insulating bobbin 9a at the intersection of the inner wall surface facing tooth side surface 11a of coil winding portion 14 and the inner wall surface of tooth end face opposing portion 141. In addition, inner wall surface groove 18b having fillet surface 18b1 is formed in an inner portion of first insulating bobbin 9a at the intersection of the inner wall surface facing tooth side surface 11b of coil winding portion 14 and the inner wall surface facing tooth end face of tooth end face opposing portion 141. The second insulating bobbin 9b (not shown) has a similar configuration to that of the first insulating bobbin 9a.

[0085] During coil winding, the radial tips of the intermediate inner wall surface portions 142a1, 142b1 of the first insulating bobbin 9a deform in a direction approaching the tooth side surface portions 11a, 11b, changing the stress at the corners of the coil winding portion 14 from tensile stress to compressive stress to prevent cracking, but to further improve reliability, it is desirable for the compressive stress to be smaller. Because the stress concentration factor is high at the corners of the coil winding portion 14, providing fillet surfaces 14a, 14b makes it possible to lower the stress concentration factor and further reduce stress.

[0086] However, if fillet surfaces 14a, 14b are simply provided at the corners of the coil winding portion 14, there is a possibility that the inside of the fillet surfaces 14a, 14b may come into contact with the tooth side surface portions 11a, 11b of the stator core 5. Therefore, in order to avoid such contact, it is necessary to widen the gap between the intermediate inner wall surface portions 142a1, 142b1, which would reduce the space between adjacent stator coils 6.

[0087] Therefore, according to the rotating electric machine of embodiment 7, an inner wall surface groove 18a having a fillet surface 18a1 is provided on the root side indicated by arrow F2 of the inner wall surface convex portions 15a1, 16a1 and the intermediate inner wall surface portion 142a1, and an inner wall surface groove 18b having a fillet surface 18b1 is provided on the root side indicated by arrow F2 of the inner wall surface convex portions 15b1, 16b1 and the intermediate inner wall surface portion 142b1.

[0088] This makes it possible to prevent contact between the inner wall surfaces of fillet surfaces 14a, 14b and tooth side surface portions 11a, 11b without increasing the distance between intermediate inner wall surface portions 142a1, 142b1.

[0089] Embodiment 8 FIG. 27 is a perspective view of a first insulating bobbin in a rotating electric machine according to embodiment 8, in which parts that are the same as or correspond to those in the rotating electric machine according to embodiment 1 are assigned the same reference numerals. In the description of the rotating electric machine according to embodiment 8, only differences from the rotating electric machine according to embodiment 1 will be described. As shown in FIG. 27, in the rotating electric machine according to embodiment 8, inner wall surface convex portions 15a1, 15b1, 16a1, and 16b1 are provided only on the base sides of inner wall surface portions 142a1 and 142b1 of coil winding portion 14. The configuration of second insulating bobbin 9b (not shown) is the same as that of first insulating bobbin 9a. The other configurations are the same as those of the rotating electric machine according to embodiment 1.

[0090] According to the rotating electric machine of each of the above-described embodiments, when winding the stator coil, the inside of the coil winding portion of the first insulating bobbin and the second insulating bobbin are abutted against the tooth side surface portions at the abutment areas on the inner diameter side and outer diameter side, thereby reliably maintaining the space between the tooth side surface portions and the intermediate region of the inner wall portion facing the tooth side surface portions of the coil winding portion, reducing the tensile stress applied to the base portion of the intermediate region of the inner wall portion facing the tooth side wall portions of the coil winding portion, preventing cracking of the insulating bobbin and reliably ensuring insulation between the stator core and the stator coil.

[0091] Although various exemplary embodiments and examples are described in this application, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless modifications not illustrated are contemplated within the scope of the technology disclosed in this application. For example, this includes cases where at least one component is modified, added, or omitted, and even cases where at least one component is extracted and combined with components of another embodiment.

[0092] Next, aspects of the rotating electric machine disclosed in the present application will be described below as supplementary notes. (Appendix 1) The rotor is fixed to a rotor shaft that is rotatably supported, and a stator that contains the rotor, the stator includes a stator core and a stator coil attached to the stator core via an insulating bobbin, the stator core is a rotating electric machine including an annular back yoke portion and teeth portions whose tip portions protrude from the back yoke portion toward the rotor shaft, the insulating bobbin is composed of a first insulating bobbin and a second insulating bobbin inserted from both end faces of the stator core in the axial direction of the rotating electric machine, At least one of the first insulating bobbin and the second insulating bobbin has a coil winding portion having a U-shaped cross section around which a conducting wire constituting the stator coil is wound, the coil winding portion has a tooth end face opposing portion opposing an end face portion of the tooth portion in the axial direction, and a tooth side face opposing portion opposing a tooth side face portion of the tooth portion in the circumferential direction of the rotating electric machine, The tooth side surface facing portion has a first contact area that contacts the tooth side surface portion, a second contact area that contacts the tooth side surface portion radially outward of the first contact area of ​​the rotating electric machine, and an intermediate inner wall surface portion that is located between the first contact area and the second contact area and faces the tooth side surface portion with a gap therebetween. A rotating electric machine characterized by: (Appendix 2) the first contact region is configured by a first inner wall surface convex portion formed adjacent to the radially inner side of the intermediate inner wall surface portion, The second contact region is configured by a second inner wall surface convex portion formed adjacent to the outer side of the intermediate inner wall surface portion in the radial direction. 2. A rotating electric machine according to claim 1. (Appendix 3) the first contact region is configured to contact a first tooth side surface protrusion formed on the tooth side surface portion, the second contact region is configured to contact a second tooth side surface convex portion formed on the tooth side surface portion radially outward of the first tooth side surface convex portion; 2. A rotating electric machine according to claim 1. (Appendix 4) the stator core includes shoe portions at the tip ends of the teeth, the shoe portions extending from the tooth side surfaces in a circumferential direction of the rotating electric machine; the tooth side surface opposing portion has a shoe side surface opposing inner wall surface portion opposing the shoe side surface portion of the shoe portion in the circumferential direction via a gap; 3. The rotating electric machine according to claim 1 or 2. (Appendix 5) At least one of the first insulating bobbin and the second insulating bobbin has an inclined surface at a circumferential tip of the tooth side surface facing portion, the inclined surface inclining in a direction away from the tooth side surface portion. 5. A rotating electric machine according to any one of claims 1 to 4. (Appendix 6) At least one of the first insulating bobbin and the second insulating bobbin is configured so that the first contact area and the second contact area are attached to the tooth side surface portion with a gap therebetween. 6. A rotating electric machine according to any one of claims 1 to 5. (Appendix 7) the tooth portion has a tooth notch portion on the radially outer side of the tooth side surface portion, the tooth notch portion being in contact with an inner peripheral surface portion of the back yoke portion, The second inner wall surface convex portion is configured to be press-fitted into the tooth notch portion. 3. A rotating electric machine according to claim 2. (Appendix 8) the first inner wall surface convex portion and the second inner wall surface convex portion are formed in a region from a base side to a tip side of the tooth side surface opposing portion. 3. A rotating electric machine according to claim 2. (Appendix 9) the first inner wall surface convex portion and the second inner wall surface convex portion are formed only on the base side of the tooth side surface opposing portion. 3. A rotating electric machine according to claim 2. (Appendix 10) an inner wall surface groove portion having a fillet surface at a base side of the tooth side surface opposing portion; 10. A rotating electric machine according to any one of claims 1 to 9. (Appendix 11) The rotor is fixed to a rotor shaft that is rotatably supported, and a stator that contains the rotor, the stator includes a stator core and a stator coil attached to the stator core via an insulating bobbin, the stator core is a rotating electric machine including an annular back yoke portion and teeth portions whose tip portions protrude from the back yoke portion toward the rotor shaft, the stator core includes shoe portions at the tip ends of the teeth, the shoe portions extending in the circumferential direction of the rotating electric machine from tooth side surfaces in the circumferential direction of the rotating electric machine, the insulating bobbin is composed of a first insulating bobbin and a second insulating bobbin inserted from both end faces of the stator core in the axial direction of the rotating electric machine, At least one of the first insulating bobbin and the second insulating bobbin has a coil winding portion having a U-shaped cross section around which a conducting wire constituting the stator coil is wound, the coil winding portion has a tooth end face opposing portion opposing the axial end face portion of the tooth portion, a tooth side face opposing portion opposing the tooth side face portion, and a shoe side face opposing inner wall surface portion opposing the circumferential shoe side face portion of the shoe portion, the shoe side-facing inner wall surface portion has a first contact area that contacts the shoe side surface portion, The tooth side surface facing portion has a second contact area that contacts the tooth side surface portion, and an intermediate inner wall surface portion that is located between the first contact area and the second contact area and faces the tooth side surface portion with a gap therebetween. A rotating electric machine characterized by: (Appendix 12) the back yoke portion of the stator core has a back yoke notch on the outer peripheral surface of the back yoke, the first insulating bobbin and the second insulating bobbin have back yoke end face opposing portions that face the end faces of the back yoke portion of the stator core, the back yoke end face opposing portion has a convex portion that protrudes toward the end face of the back yoke portion, A convex portion protruding toward the end face of the back yoke portion is configured to be press-fitted into a back yoke notch portion of the outer peripheral surface of the back yoke, thereby fixing the first insulating bobbin and the second insulating bobbin to the stator core. 12. A rotating electric machine according to any one of claims 1 to 11, [Explanation of symbols]

[0093] 1. Rotating electric machine, 2. Stator, 3. Rotor, 4. Frame, 5. Stator core, 6 stator coil, 7 rotor shaft, 5a electromagnetic steel plate, 9a first insulating bobbin, 9b second insulating bobbin, 10 back yoke portion, 10a back yoke outer peripheral surface portion, 10b back yoke inner peripheral surface portion, 10c back yoke side surface portion, 11 teeth portion, 11a, 11b tooth side portion, 11c tooth tip portion, 11a1, 11a2, 11b1, 11b2: Teeth side protrusions, 12 back yoke notch, 12a side surface, 13 back yoke end surface facing portion, 13a back yoke end surface facing portion, 14 coil winding portion, 14a, 14b, 18a1, 18b1 fillet surfaces, 15 first flange portion, 15a1, 15b1, 16a1, 16b1: inner wall surface convex portion; 16: second flange portion; 17 insulating bobbin opening, 18a, 18b inner wall surface groove portion, 51, 52 core end surface portion, 111 shoe portion, 111a, 111b shoe side portion, 115a, 115b tooth notch portion, 131 protrusion portion, 131a side portion, 141 Teeth end face opposing portion, 141a Teeth end face opposing surface portion, 142a, 142b Teeth side facing part, 142a1, 142b1 Intermediate inner wall part, 142a1,142b1 Inner wall section, 142as, 142bs sloped surface, 151a, 151b Shoe side facing inner wall section, 162a, 162b: back yoke inner peripheral surface facing portion; 401 End wall

Claims

1. The rotor is fixed to a rotor shaft that is rotatably supported, and a stator that contains the rotor. the stator includes a stator core and a stator coil attached to the stator core via an insulating bobbin, the stator core is a rotating electric machine including an annular back yoke portion and teeth portions whose tip portions protrude from the back yoke portion toward the rotor shaft, the insulating bobbin is composed of a first insulating bobbin and a second insulating bobbin inserted from both end faces of the stator core in the axial direction of the rotating electric machine, At least one of the first insulating bobbin and the second insulating bobbin has a coil winding portion having a U-shaped cross section around which a conducting wire constituting the stator coil is wound, the coil winding portion has a tooth end face opposing portion opposing an end face portion of the tooth portion in the axial direction, and a tooth side face opposing portion opposing a tooth side face portion of the tooth portion in the circumferential direction of the rotating electric machine, The tooth side surface facing portion has a first contact area that contacts the tooth side surface portion, a second contact area that contacts the tooth side surface portion radially outward of the first contact area of ​​the rotating electric machine, and an intermediate inner wall surface portion that is located between the first contact area and the second contact area and faces the tooth side surface portion with a gap therebetween. A rotating electric machine characterized by:

2. the first contact region is configured by a first inner wall surface convex portion formed adjacent to the radially inner side of the intermediate inner wall surface portion, the second contact region is configured by a second inner wall surface convex portion formed adjacent to the outer side of the intermediate inner wall surface portion in the radial direction.

2. The rotating electrical machine according to claim 1.

3. the first contact region is configured to contact a first tooth side surface protrusion formed on the tooth side surface portion, the second contact region is configured to contact a second tooth side surface convex portion formed on the tooth side surface portion radially outward of the first tooth side surface convex portion; 2. The rotating electrical machine according to claim 1.

4. the stator core includes shoe portions at the tip ends of the teeth, the shoe portions extending from the tooth side surfaces in a circumferential direction of the rotating electric machine; the tooth side surface opposing portion has a shoe side surface opposing inner wall surface portion opposing the shoe side surface portion of the shoe part in the circumferential direction with a gap therebetween; 3. The rotating electric machine according to claim 1 or 2.

5. At least one of the first insulating bobbin and the second insulating bobbin has an inclined surface at a circumferential tip of the tooth side surface facing portion, the inclined surface inclining in a direction away from the tooth side surface portion.

3. The rotating electric machine according to claim 1 or 2.

6. At least one of the first insulating bobbin and the second insulating bobbin is configured to be attached with a gap between the first contact area and the second contact area and the tooth side surface portion.

3. The rotating electric machine according to claim 1 or 2.

7. the tooth portion has a tooth notch portion on the radially outer side of the tooth side surface portion, the tooth notch portion being in contact with an inner peripheral surface portion of the back yoke portion, the second inner wall surface convex portion is configured to be press-fitted into the tooth notch portion.

3. The rotating electrical machine according to claim 2.

8. the first inner wall surface convex portion and the second inner wall surface convex portion are formed in a region from a base side to a tip side of the tooth side surface opposing portion, 3. The rotating electrical machine according to claim 2.

9. the first inner wall surface convex portion and the second inner wall surface convex portion are formed only on the base side of the tooth side surface opposing portion; 3. The rotating electrical machine according to claim 2.

10. an inner wall surface groove portion having a fillet surface at a base side of the tooth side surface opposing portion; 3. The rotating electric machine according to claim 1 or 2.

11. The rotor is fixed to a rotor shaft that is rotatably supported, and a stator that contains the rotor. the stator includes a stator core and a stator coil attached to the stator core via an insulating bobbin, the stator core is a rotating electric machine including an annular back yoke portion and teeth portions whose tip portions protrude from the back yoke portion toward the rotor shaft, the stator core includes shoe portions at the tip ends of the teeth, the shoe portions extending in the circumferential direction of the rotating electric machine from tooth side surfaces in the circumferential direction of the rotating electric machine, the insulating bobbin is composed of a first insulating bobbin and a second insulating bobbin inserted from both end faces of the stator core in the axial direction of the rotating electric machine, At least one of the first insulating bobbin and the second insulating bobbin has a coil winding portion having a U-shaped cross section around which a conducting wire constituting the stator coil is wound, the coil winding portion has a tooth end face opposing portion opposing the axial end face portion of the tooth portion, a tooth side face opposing portion opposing the tooth side face portion, and a shoe side face opposing inner wall surface portion opposing the circumferential shoe side face portion of the shoe portion, the shoe side-facing inner wall surface portion has a first contact area that contacts the shoe side surface portion, the tooth side surface facing portion has a second contact area that contacts the tooth side surface portion, and an intermediate inner wall surface portion that is located between the first contact area and the second contact area and faces the tooth side surface portion with a gap therebetween. A rotating electric machine characterized by:

12. the back yoke portion of the stator core has a notch on the outer peripheral surface of the back yoke, the first insulating bobbin and the second insulating bobbin have back yoke end face opposing portions that face end faces of the back yoke portion of the stator core, the back yoke end face opposing portion has a convex portion that protrudes toward the end face of the back yoke portion, a protrusion protruding toward an end face of the back yoke portion is press-fitted into a notch in an outer peripheral surface portion of the back yoke, thereby fixing the first insulating bobbin and the second insulating bobbin to the stator core.

12. The rotating electric machine according to claim 1 or 11.

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