Stator of rotary electric machine

Abstract

The stator of a rotary electric machine comprises a stator core, a coil, and a plurality of bobbins. The stator core forms an annular shape having a cylindrical yoke and a plurality of teeth arranged at predetermined intervals in the circumferential direction of the yoke and protruding radially inward from the yoke. The coil id formed by being wound around the teeth. The bobbin covers, in a slot between the teeth adjacent to each other in the circumferential direction, the surface portion of the slot with respect to the coil. The stator core has a plurality of divided cores divided in the circumferential direction. The bobbin is disposed in each of the plurality of divided cores and has a contact portion that makes contact with the bobbin adjacent in the circumferential direction. One of the contact portions of the bobbins adjacent to each other in the circumferential direction has an engaging portion that engages with the other, and the other has an engaged portion that is engaged with the engaging portion.

Description

Stator of a rotating electrical machine

[0001] An embodiment of the present invention relates to a stator for a rotating electrical machine.

[0002] A rotating electric machine includes a cylindrical stator and a rotor rotatably mounted relative to the stator. The stator includes, for example, a cylindrical yoke, a stator core having a plurality of teeth protruding radially inward from the yoke, and coils wound around the teeth. Slots are formed between adjacent teeth in the circumferential direction, through which the coils wound around the teeth are inserted. For example, a predetermined insulating part (hereinafter referred to as an insulating bobbin) is inserted between the stator core and the coil within the slot to provide insulation between them.

[0003] To increase the coil space factor in the stator, the stator core may be divided into multiple pieces and assembled together. In this case, an insulating bobbin is disposed in each of the divided stator cores (hereinafter referred to as "split cores"). The split surfaces of adjacent split cores in the circumferential direction must be adjacent to form a magnetic circuit. Therefore, the adjacent portions of adjacent insulating bobbins are flush with the split surfaces of the adjacent split cores or are slightly recessed in the circumferential direction relative to the split surfaces. This prevents the adjacent portions of adjacent insulating bobbins from interfering with each other.

[0004] On the other hand, if the adjacent portions are recessed circumferentially from the split surface, the inner peripheral portions of the split cores are exposed to the coil at the slots. Therefore, for example, if the rotating electric machine is used in the electric motor section of an air conditioner compressor (rotary compressor), there is a risk that foreign matter such as metal powder contained in the compressor's sealed container will adhere to the coil or each split surface of circumferentially adjacent split cores.

[0005] JP 2010-213543 A JP 2016-116418 A JP 2016-116417 A

[0006] The present invention has been made based on this, and its purpose is to provide a stator for a rotating electric machine that can provide appropriate insulation between the stator core and coil within the slot and prevent foreign matter from entering from adjacent areas between circumferentially adjacent insulating bobbins.

[0007] According to an embodiment, a stator for a rotating electric machine includes a stator core, a coil, and a plurality of bobbins. The stator core is annular and includes a cylindrical yoke and a plurality of teeth arranged at predetermined intervals around the yoke and protruding radially inward from the yoke. The coil is wound around the teeth. The bobbin covers the surface of a slot between adjacent teeth in the circumferential direction with respect to the coil. The stator core includes a plurality of split cores divided in the circumferential direction. The bobbin is arranged in each of the split cores and has a contact portion that contacts the adjacent bobbin in the circumferential direction. One of the contact portions of the adjacent bobbins in the circumferential direction has an engaging portion that engages with the other, and the other has an engaged portion that engages with the engaging portion.

[0008] 1 is a side view showing a schematic configuration of a rotating electric machine according to a first embodiment, viewed from a predetermined direction perpendicular to the rotation axis. FIG. 2 is a plan view showing an example of the schematic configuration of the rotating electric machine shown in FIG. 1, viewed from one side in the extension direction (axial direction) of the rotation axis. FIG. 3 is a view showing an enlarged view of a contact state of contact portions of two circumferentially adjacent bobbins shown in FIG. 2. FIG. 4 is a plan view showing an example of the schematic configuration of a rotating electric machine according to a second embodiment, viewed from one side in the axial direction. FIG. 5 is a view showing an enlarged view of a contact state of contact portions of two circumferentially adjacent bobbins shown in FIG. 6. FIG. 7 is a plan view showing an example of the schematic configuration of a rotating electric machine according to a third embodiment, viewed from one side in the axial direction.

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The application of the rotating electric machine according to the present invention is not particularly limited. In this embodiment, an example in which the rotating electric machine is used as an electric motor unit of a rotary compressor of an air conditioner will be described. The electric motor unit is a driving source for a compression mechanism unit that compresses a refrigerant in the compressor.

[0010] Fig. 1 is a side view showing a schematic configuration of a rotating electric machine according to this embodiment, viewed from a predetermined direction perpendicular to a rotation axis. Fig. 2 is a plan view showing an example of the schematic configuration of the rotating electric machine shown in Fig. 1, viewed from one side in the extension direction of the rotation axis (hereinafter referred to as the axial direction).

[0011] 1 and 2 , the rotating electric machine 1 includes a stator 11 and a rotor 12. The stator 11 is fixed to, for example, the inner periphery of a sealed container (not shown) of a compressor and is maintained stationary within the sealed container. The rotor 12 is fixed to, for example, a rotating shaft 13 within the sealed container of the compressor and rotates the rotating shaft 13. When power is supplied to the rotating electric machine 1 from a power source, the rotor 12 rotates relative to the stator 11 about a central axis O1 of the rotating shaft 13, and the rotating shaft 13 rotates together with the rotor 12. The rotating shaft 13 is rotatably supported by a bearing (not shown) in the sealed container.

[0012] The stator 11 and the rotor 12 are each formed of a laminated body in which a plurality of iron core pieces made of, for example, electromagnetic steel sheets are stacked in the axial direction. The rotating shaft 13 is inserted into and fitted into a hole that penetrates the center of the rotor 12, which is a laminated body in which a plurality of disc-shaped iron core pieces are stacked.

[0013] The stator 11 includes an annular stator core (stator iron core) 21, a coil 25, and a plurality of bobbins 26. The stator core 21 includes a cylindrical yoke 22 and a plurality of teeth 23 that protrude radially inward from the yoke 22 toward the rotor 12. The teeth 23 are arranged at predetermined equal intervals along the circumferential direction of the yoke 22. The gaps between adjacent teeth 23 in the circumferential direction are configured as slots 24 through which coils 25 are inserted. In other words, each tooth 23 is formed between adjacent slots 24 in the circumferential direction. That is, in the stator core 21, the teeth 23 and the slots 24 are arranged alternately in the circumferential direction. Each of the plurality of slots 24 opens onto the inner circumferential surface of the stator core 21. The teeth 23 and the slots 24 each extend over the entire axial length of the stator core 21.

[0014] In the illustrated example, the stator core 21 has six slots 24 (in other words, six teeth 23), but the number of slots 24 may be any even number and is not limited to six.

[0015] A coil 25 is inserted into each slot 24. A coil 25 is wound around each tooth 23, the coils 25 being inserted into slots 24 located on both sides of the tooth 23 in the circumferential direction.

[0016] When wound around the teeth 23 in this manner, the coils 25 have coil ends 25a, 25b that extend axially outward beyond the one end surface 211 and the other end surface 212 of the stator core 21. The coils 25 are conductors made of copper, aluminum, or other material with sufficient conductivity. In the illustrated example, the coils 25 are made of long electric wires whose cross section (transverse cross section) perpendicular to the longitudinal direction is circular.

[0017] In this embodiment, the stator core 21 has a plurality of split cores 31 that are split in the circumferential direction. The stator core 21 is split, for example, for each tooth 23 that the stator core 21 has. These split cores 31 are arranged side by side in the circumferential direction and form a cylindrical stator core 21 as a whole. Two split cores 31 that are adjacent in the circumferential direction are arranged side by side in the circumferential direction with their split surfaces 31s in contact with each other.

[0018] Each split core 31 has a portion of the yoke 22 of the stator core 21 and the teeth 23 of the stator core 21. The portion of the split core 31 that forms the yoke 22 has an arc-shaped outer peripheral portion 31a and a flat inner peripheral portion 31b that faces the slots 24. The teeth 23 have a pair of side portions 23a, 23b that extend radially inward from the portion of the split core 31 that forms the yoke 22 toward the rotor 12, and a tip portion 23c that connects one end of these side portions 23a, 23b. The tip portion 23c of the tooth 23 has a pair of protrusions 23d that protrude on both sides in the circumferential direction and extend the entire axial length of the split core 31.

[0019] In the slot 24, the bobbin 26 covers the surface portion of the slot 24 (hereinafter referred to as the slot surface portion) with respect to the coil 25. The slot surface portion is the surface portion of the slot 24 facing the coil 25, and is the surface portion defined by the inner peripheral portion 31 b of the split core 31 and the surface portion of the tooth 23 adjacent to the slot 24 (side portions 23 a, 23 b and outer peripheral portion 23 e of the protrusion 23 d, which will be described later).

[0020] In other words, the bobbin 26 prevents the slot surface from being exposed at the location where the coil 25 is inserted into the slot 24. The bobbin 26 is made of an insulating material, for example, an insulating resin such as polybutylene terephthalate (PBT) or liquid crystal polymer (LCP), and is interposed within the slot 24 between the slot surface and the coil 25. This insulates the stator core 21 from the coil 25 by the bobbin 26. In other words, the bobbin 26 insulates the stator core 21 from the coil 25.

[0021] One bobbin 26 is disposed on each of the plurality of split cores 31. These bobbins 26 are arranged side by side in the circumferential direction and collectively form an annular shape concentric with the stator core 21. Each of the plurality of bobbins 26 extends over the entire axial length of the corresponding split core 31, or more specifically, the stator core 21.

[0022] The bobbin 26 has a pair of mounting portions 26a, 26b that are respectively mounted on the inner peripheral portion 31b of the split core 31, the pair of side portions 23a, 23b of the teeth 23, and the outer peripheral portion 23e of the protrusion 23d of the split core 31. The pair of mounting portions 26a, 26b are integrally formed, for example, with both edges of a base portion (not shown). The base portion is mounted on an end face of the split core 31 that corresponds to one end face 211 or the other end face 212 of the stator core 21.

[0023] The bobbin 26 has a contact portion 41 that comes into contact with another circumferentially adjacent bobbin 26. That is, two circumferentially adjacent bobbins 26 are arranged side by side in the circumferential direction with their contact portions 41 in contact with each other.

[0024] Of the contact portions 41 that come into contact with each other on two circumferentially adjacent bobbins 26, one has an engaging portion that engages with the other, and the other has an engaged portion that engages with the engaging portion. The shape of these engaging portion and engaged portion can be any shape as long as they engage with each other in the slot 24 so that the slot surface portion of the slot 24 can be covered by the coil 25.

[0025] 2 and 3 show an example (first embodiment) of the form of the contact portions 41 that come into contact with each other on two circumferentially adjacent bobbins 26. Fig. 3 is an enlarged view showing the contact state of the contact portions 41 on two circumferentially adjacent bobbins 26 shown in Fig. 2 .

[0026] 2 and 3, the engaging portion and the engaged portion of the contact portion 41 have a concave-convex shape. In the illustrated example, the engaging portion is a convex portion 42a, and the engaged portion is a concave portion 42b. As shown in FIG. 3, in the contact portions 41 that contact each other on two circumferentially adjacent bobbins 26, the contact portion 41 of one bobbin 26 (the contact portion 41a of the bobbin 261) has, as an engaging portion, a convex portion 42a that protrudes toward the contact portion 41 of the other bobbin 26 (the contact portion 41b of the bobbin 262). In contrast, the contact portion 41 of the other bobbin 26 (the contact portion 41b of the bobbin 262) has, as an engaged portion, a concave portion 42b into which the convex portion 42a, which is the engaging portion of the contact portion 41 of the one bobbin 26 (the contact portion 41a of the bobbin 261), fits.

[0027] The protrusions 42a protrude beyond the contact points 32 between the split surfaces 31s of circumferentially adjacent split cores 31 along the inner periphery 31b of the split core 31 in the slot 24. That is, the protrusions 42a extend along the inner periphery 31b of the split core 31 so that their tips extend beyond the contact points 32.

[0028] In contrast, the contact portion 41 (41b) having the recess 42b extends along the inner circumferential portion 31b of the split core 31 in the slot 24, with a portion of the tip thereof substantially overlapping the contact location 32, and the remaining portion of the tip is recessed in the recess 42b without exceeding the contact location 32. In other words, the contact portion 41b extends along the inner circumferential portion 31b of the split core 31 so that the tip portion other than the recess 42b substantially overlaps the contact location 32.

[0029] 2, six bobbins 26 corresponding to the six split cores 31 are arranged side by side in the circumferential direction, forming an annular shape concentric with the cylindrical stator core 21. These six bobbins 26 include a first type bobbin 261 and a second type bobbin 262, which are two types having different shapes of contact portions 41. The first type bobbins 261 and the second type bobbins 262 are arranged alternately in the circumferential direction.

[0030] The bobbin 261 has contact portions 41 at both ends in the circumferential direction that each have a protrusion 42a. In contrast, the bobbin 262 has contact portions 41 at both ends in the circumferential direction that each have a recess 42b. That is, the contact portions 41 of the bobbin 261 only have the protrusion 42a, which is the engaging portion, and the contact portions 41 of the bobbin 262 only have the recess 42b, which is the engaged portion. In the example shown in FIG. 2 , when the stator core 21 is configured using six split cores 31 in which the bobbins 261, 262 are arranged, the split cores 31 can be assembled, for example, as follows.

[0031] For example, three split cores 31 each having a bobbin 262, i.e., a bobbin 26 whose contact portion 41 has only the recessed portion 42b, are arranged at equal intervals along the circumferential direction. Then, three split cores 31 each having a bobbin 261, i.e., a bobbin 26 whose contact portion 41 has only the protruding portion 42a, are inserted one by one from the outside in the radial direction between the split cores 31 each having a bobbin 262 arranged adjacently in the circumferential direction. At this time, the protruding portion 42a of the bobbin 261 is fitted into the recessed portion 42b of the bobbin 262. This allows the assembly of multiple split cores 31 to be performed efficiently. In the assembled six split cores 31, the bobbins 261 of the first type and the bobbins 262 of the second type are arranged alternately in the circumferential direction.

[0032] According to this embodiment, two circumferentially adjacent bobbins 26 can be arranged side by side in the circumferential direction with their contact portions 41 in contact with each other. Of the contact portions 41 of the two circumferentially adjacent bobbins 26, one has a protrusion 42a as an engaging portion that engages with the other, and the other has a recess 42b as an engaged portion that engages with the protrusion 42a, which is the engaging portion. Therefore, at these contact portions 41, the protrusion 42a can be fitted into the recess 42b to engage with each other. In other words, with the protrusion 42a engaged with the recess 42b, the slot surface of the slot 24 can cover the coil 25 in the slot 24.

[0033] This provides appropriate insulation between the stator core 21 and the coils 25 in the slots 24 and prevents foreign matter from entering through the adjacent portions (contact portions 41) between circumferentially adjacent bobbins 26. Therefore, even when the rotating electric machine 1 is used in the motor portion of a compressor (rotary compressor) for an air conditioner, for example, foreign matter such as metal powder contained in the refrigerant can be prevented from adhering to the split surfaces 31s of circumferentially adjacent split cores 31. This prevents the insulation distance between the stator core 21 and the coils 25 from being short-circuited, thereby avoiding the occurrence of partial discharges and the like.

[0034] As described above, as long as the slot surface portions of the slots 24 (the inner peripheral portions 31 b of the split core 31, the side portions 23 a, 23 b of the teeth 23, and the outer peripheral portions 23 e of the protrusions 23 d) are engaged with the coils 25 in a manner that allows them to be covered, the engaging portions and engaged portions of the contact portions 41 can have any shape and are not limited to the first embodiment shown in FIGS. 2 and 3 . Below, second and third embodiments that differ from the first embodiment will be described. In these embodiments, the configuration of the rotating electric machine (stator and rotor) other than the shape of the engaging portions and engaged portions of the contact portions is the same as that of the rotating electric machine 1 described above. Therefore, the configuration of the rotating electric machine other than the contact portions in the second and third embodiments will not be described again, with the description of the rotating electric machine 1 being referred to as appropriate.

[0035] As with the first embodiment described above, these second and third embodiments also provide appropriate insulation between the stator core 21 and the coils 25 in the slots 24 and prevent foreign matter from entering from adjacent locations between circumferentially adjacent bobbins. Note that while the first embodiment is limited to a configuration in which the stator core 21 has an even number (six in the illustrated example) of slots 24 (in other words, six teeth 23), the second and third embodiments may have any number of slots 24, and may be either an even number or an odd number.

[0036] Second Embodiment Fig. 4 is a plan view showing an example of a schematic configuration of a rotating electric machine 102 according to a second embodiment, as viewed from one side in the axial direction. Fig. 5 is an enlarged view showing a contact state between contact portions 51 of two circumferentially adjacent bobbins 66 shown in Fig. 4.

[0037] The bobbin 66, like the bobbin 26 of the first embodiment, has a pair of mounting portions 66a, 66b that are mounted on the inner peripheral portion 31b of the split core 31, a pair of side portions 23a, 23b of the teeth 23, and the outer peripheral portion 23e of the protrusion portion 23d, respectively.

[0038] 4 and 5, the engaging portion and the engaged portion of the contact portion 51 have a concave-convex shape. In the illustrated example, the engaging portion is a convex portion 52a, and the engaged portion is a concave portion 52b. As shown in FIG. 5, in the contact portions 51 that contact each other on two circumferentially adjacent bobbins 66, the contact portion 51 (contact portion 51a) of one bobbin 66 has, as an engaging portion, a convex portion 52a that protrudes toward the contact portion 51 (contact portion 51b) of the other bobbin 66. In contrast, the contact portion 51 (contact portion 51b) of the other bobbin 66 has, as an engaged portion, a concave portion 52b into which the convex portion 52a, which is the engaging portion of the contact portion 51 (contact portion 51a) of the one bobbin 66, fits.

[0039] The protrusions 52a protrude beyond the contact points 32 between the split surfaces 31s of circumferentially adjacent split cores 31 along the inner circumferential portions 31b of the split cores 31 in the slots 24. That is, the protrusions 52a extend along the inner circumferential portions 31b of the split cores 31 so that their tips extend beyond the contact points 32.

[0040] Similarly, the contact portion 51 (51b) having the recess 52b protrudes beyond the contact point 32 along the inner periphery 31b of the split core 31 in the slot 24. That is, the contact portion 51b extends along the inner periphery 31b of the split core 31 so that its tip exceeds the contact point 32.

[0041] 4, these six bobbins 66 are all of the same shape, and are not configured to include two shapes (bobbins 261, 262) of the contact portion 51 that are different in shape, as in the first embodiment. However, the six bobbins 66 may include two shapes of bobbins that are different in shape of the contact portion 51, as in the first embodiment. For example, there may be a mixture of bobbins in which the contact portion 51 at both ends in the circumferential direction has a convex portion 52a and bobbins in which the contact portion 51 at both ends in the circumferential direction has a concave portion 52b.

[0042] 6 is a plan view showing an example of a schematic configuration of a rotating electric machine 103 according to a third embodiment, as viewed from one side in the axial direction. FIG. 7 is an enlarged view showing a contact state between contact portions 71 of two circumferentially adjacent bobbins 86 shown in FIG.

[0043] Like the bobbin 26 of the first embodiment, the bobbin 86 has a pair of mounting portions 86a, 86b that are mounted on the inner peripheral portion 31b of the split core 31, a pair of side portions 23a, 23b of the teeth 23, and the outer peripheral portion 23e of the protrusion portion 23d, respectively.

[0044] 6 and 7 , the engaging portion and the engaged portion of the contact portion 71 have a concave-convex shape. In the illustrated example, the engaging portion is a convex portion 72a, and the engaged portion is a concave portion 72b. As shown in FIG. 7 , in the contact portions 71 that contact each other on two circumferentially adjacent bobbins 86, the contact portion 71 (contact portion 71a) of one bobbin 86 has, as an engaging portion, a convex portion 72a that protrudes toward the contact portion 71 (contact portion 71b) of the other bobbin 86. In contrast, the contact portion 71 (contact portion 71b) of the other bobbin 86 has, as an engaged portion, a concave portion 72b into which the convex portion 72a, which is the engaging portion of the contact portion 71 (contact portion 71a) of the one bobbin 86, fits.

[0045] The protrusions 72a protrude beyond the contact points 32 between the split surfaces 31s of circumferentially adjacent split cores 31 along the inner periphery 31b of the split core 31 in the slots 24. That is, the protrusions 72a extend along the inner periphery 31b of the split core 31 so that their tips extend beyond the contact points 32.

[0046] In contrast, the contact portion 71 (71b) having the recess 72b is recessed at the entire tip end at the recess 72b along the inner periphery 31b of the split core 31 in the slot 24 without going beyond the contact point 32. In other words, the contact portion 41b extends along the inner periphery 31b of the split core 31 without its tip going beyond the contact point 32.

[0047] 6, these six bobbins 86 are all of the same shape, similar to the bobbin 66 of the second embodiment, and are not configured to include two shapes (bobbins 261, 262) of the contact portion 71 that are different in shape, as in the first embodiment. However, similar to the first embodiment, the six bobbins 86 may include bobbins with two shapes of the contact portion 71 that are different in shape. For example, there may be a mixture of bobbins in which the contact portion 71 at both ends in the circumferential direction has a convex portion 72a and bobbins in which the contact portion 71 at both ends in the circumferential direction has a concave portion 72b.

[0048] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims.

[0049] DESCRIPTION OF SYMBOLS 1... Rotating electric machine, 11... Stator, 12... Rotor, 13... Rotating shaft, 21... Stator core, 22... Yoke, 23... Teeth, 23a, 23b... Sides of teeth, 23c... Tips of teeth, 23d... Protrusions of tips of teeth, 23e... Outer periphery of protrusions of teeth, 24... Slot, 25... Coil, 25a, 25b... Coil end, 26, 66, 86, 261, 262... Bobbin, 26a, 26b, 66a, 66b, 86a, 86b... Bobbin mounting portion of the split core, 31...split core, 31a...outer periphery of split core, 31b...inner periphery of split core, 31s...split surface, 32...contact point between split surfaces, 41, 41a, 41b, 51, 51a, 51b, 71, 71a, 71b...contact portion, 42a, 52a, 72a...convex portion, 42b, 52b, 72b...concave portion, 211...one end surface of stator core, 212...other end surface of stator core, 261...bobbin of first type, 262...bobbin of second type, O1...central axis of rotation shaft,

Claims

1. A stator for a rotating electric machine comprising: a cylindrical yoke; an annular stator core having a plurality of teeth arranged at predetermined intervals circumferentially around the yoke and protruding radially inward from the yoke; coils wound around the teeth; and a plurality of bobbins arranged in slots between circumferentially adjacent teeth, covering the surface of the slots for the coils, wherein the stator core has a plurality of split cores divided in the circumferential direction, the bobbins are arranged on each of the plurality of split cores and have contact portions that come into contact with circumferentially adjacent bobbins, and one of the contact portions of the circumferentially adjacent bobbins has an engaging portion that engages with the other, and the other has an engaged portion that engages with the engaging portion.

2. A stator for a rotating electric machine as described in claim 1, wherein the engaging portion is a convex portion that extends along the inner periphery of the split core in the slot beyond the contact point between the circumferentially adjacent split cores, the engaged portion is a concave portion into which the convex portion fits, and the contact portion having the concave portion extends along the inner periphery of the split core in the slot so that the tip portion other than the concave portion approximately overlaps the contact point.

3. A stator for a rotating electric machine according to claim 2, wherein the plurality of bobbins include bobbins of a first type having only the convex portion as the contact portion and bobbins of a second type having only the concave portion as the contact portion, and the bobbins of the first type and the bobbins of the second type are arranged alternately in the circumferential direction.

4. A stator for a rotating electric machine as described in claim 1, wherein the engaging portion is a convex portion that extends along the inner periphery of the split core in the slot beyond the contact point between the circumferentially adjacent split cores, the engaged portion is a concave portion into which the convex portion fits, and the contact portion having the concave portion extends along the inner periphery of the split core in the slot so that the tip portion other than the concave portion extends beyond the contact point.

5. A stator for a rotating electric machine as described in claim 1, wherein the engaging portion is a convex portion that extends beyond the contact point between the circumferentially adjacent split cores along the inner periphery of the split core in the slot, the engaged portion is a concave portion into which the convex portion fits, and the contact portion having the concave portion has a tip portion that extends along the inner periphery of the split core in the slot without the entire tip portion extending beyond the contact point.

6. A stator for a rotating electric machine according to claim 4 or 5, wherein each of the plurality of bobbins has the same configuration, with the protrusion as the contact portion on one side in the circumferential direction and the recess as the contact portion on the other side in the circumferential direction.

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