Stator of a rotating electric machine

Abstract

The stator of a rotating electric machine comprises a stator core, coils, and multiple frames. The stator core is annular, having a cylindrical yoke and multiple teeth arranged at predetermined intervals along the circumference of the yoke and projecting radially inward from the yoke. The coils are wound around the teeth. The frames cover the surface of the slots between adjacent teeth in the circumferential direction relative to the coils. The stator core has multiple segmented cores divided circumferentially. A frame is disposed in each of the multiple segmented cores and has a contact portion that contacts the frame adjacent in the circumferential direction. In the respective contact portions of adjacent frames in the circumferential direction, one has an engaging portion that engages with the other, and the other has a engaged portion that engages with the engaging portion.

Description

Technical Field

[0001] Embodiments of the present invention relate to the stator of a rotary electric machine. Background Technology

[0002] A rotary electric machine comprises a cylindrical stator and a rotor rotatably mounted relative to the stator. The stator includes a stator core having, for example, a cylindrical yoke and multiple teeth projecting radially inward from the yoke, and a coil wound around the teeth. Slots are formed between adjacent teeth in the circumferential direction for the coil wound around the teeth to pass through. Insulation between the stator core and the coil is achieved, for example, by inserting a predetermined insulating component (hereinafter referred to as an insulating frame).

[0003] To increase the coil occupancy rate in the stator, a structure is sometimes used where the stator core is divided into multiple parts and assembled integrally. In this case, an insulating frame is placed corresponding to each of the divided stator cores (hereinafter referred to as the divided cores). To form a magnetic circuit, the dividing surfaces of adjacent divided cores in the circumferential direction need to be adjacent. Therefore, the adjacent portions of adjacent insulating frames in the circumferential direction are set to be flush with or slightly recessed from the dividing surfaces of the adjacent divided cores in the circumferential direction. This ensures that the adjacent portions of adjacent insulating frames in the circumferential direction do not interfere with each other.

[0004] On the other hand, when the adjacent parts are recessed in the circumferential direction compared to the dividing surface, the inner circumferential portion of the dividing core in the slot becomes exposed relative to the coil. Therefore, for example, in the case where a rotary motor is used in the motor section of an air conditioner compressor (rotary compressor), there is a possibility that foreign matter such as metal powder contained in the compressor's sealed container may adhere to the dividing surface of the coil or the dividing surface of the adjacent dividing core in the circumferential direction.

[0005] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2010-213543 Patent Document 2: Japanese Patent Application Publication No. 2016-116418 Patent Document 3: Japanese Patent Application Publication No. 2016-116417 Summary of the Invention The technical problem that the invention aims to solve The present invention was made based on the above circumstances, and its purpose is to provide a stator for a rotating electric motor that can provide appropriate insulation between the stator core and the coil in the slot, and can prevent foreign objects from intruding into adjacent parts of the circumferentially adjacent insulating frames.

[0006] Solution to the above technical problems According to one embodiment, the stator of a rotating electric machine includes a stator core, coils, and multiple frames. The stator core is annular, having a cylindrical yoke and multiple teeth arranged at predetermined intervals in the circumferential direction of the yoke and projecting radially inward from the yoke. The coils are wound around the teeth. The frames cover the surface of the slots between adjacent teeth in the circumferential direction relative to the coils. The stator core has multiple segmented cores divided along the circumferential direction. Each of the multiple segmented cores is disposed in a frame and has a contact portion that contacts the frames adjacent in the circumferential direction. In the contact portions of each of the adjacent frames in the circumferential direction, one has an engaging portion that engages with the other, and the other has a engaged portion that engages with the engaging portion. Attached Figure Description

[0007] Figure 1 This is a side view showing the schematic structure of the rotary electric machine according to the first embodiment from a predetermined direction orthogonal to the rotation axis.

[0008] Figure 2 It is shown from one side of the direction of extension (axial direction) of the rotation axis. Figure 1 A top view of an example of the schematic structure of a rotary electric machine.

[0009] Figure 3 It is shown in magnification Figure 2 The diagram shows the contact pattern of the contact points between two adjacent skeletons in the circumferential direction.

[0010] Figure 4 This is a top view showing an example of the schematic structure of the rotary motor according to the second embodiment from one axial side.

[0011] Figure 5 It is shown in magnification Figure 4 The diagram shows the contact pattern of the contact points between two adjacent skeletons in the circumferential direction.

[0012] Figure 6 This is a top view showing an example of the schematic structure of the rotary motor according to the third embodiment from one axial side.

[0013] Figure 7 It is shown in magnification Figure 6 The diagram shows the contact pattern of the contact points between two adjacent skeletons in the circumferential direction. Detailed Implementation

[0014] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The application of the rotary electric motor involved in the present invention is not particularly limited. In this embodiment, the case of the motor section of a rotary compressor for an air conditioner will be described as an example. The motor section is the drive source of the compression mechanism section in the compressor that compresses the refrigerant.

[0015] (First Embodiment) Figure 1 This is a side view showing the schematic structure of the rotary electric motor involved in this embodiment from a predetermined direction orthogonal to the rotation axis. Figure 2 It is shown from one side of the direction of extension of the axis of rotation (hereinafter referred to as the axial direction). Figure 1 A top view of an example of the schematic structure of a rotary electric machine.

[0016] like Figure 1 as well as Figure 2 As shown, the rotary motor 1 includes a stator 11 and a rotor 12. The stator 11 is fixed to the inner periphery of a compressor's sealed container (not shown) and remains stationary within the sealed container. The rotor 12 is fixed to a rotating shaft 13 within the compressor's sealed container, and the rotating shaft 13 rotates. When power is supplied to the rotary motor 1 from a power source, the rotor 12 rotates relative to the stator 11 about the 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 in the sealed container by bearings (not shown).

[0017] The stator 11 and rotor 12 are composed of a laminate, which is formed by stacking multiple iron chips, such as electromagnet steel plates, in the axial direction. The rotating shaft 13 is inserted through and fitted into a hole that passes through the central part of the rotor 12, which is a laminate composed of multiple disc-shaped iron chips.

[0018] The stator 11 has an annular stator core 21, coils 25 and multiple frames 26.

[0019] The stator core 21 has a cylindrical yoke 22 and a plurality of teeth 23 protruding radially inward from the yoke 22 toward the rotor 12. The teeth 23 are arranged at predetermined equal intervals along the circumference of the yoke 22. The gaps between adjacent teeth 23 in the circumferential direction form slots 24 through which coils 25 are inserted. In other words, the teeth 23 are formed between adjacent slots 24 in the circumferential direction. That is, in the stator core 21, the teeth 23 and slots 24 are arranged alternately in the circumferential direction. Each of these slots 24 opens on the inner circumferential surface of the stator core 21. The teeth 23 and slots 24 extend along the entire axial length of the stator core 21.

[0020] In addition, in the example shown in the figure, the stator core 21 is configured with six slots 24 (in other words, six teeth 23), but the number of slots 24 can be any number as long as it is even, and is not limited to six.

[0021] A coil 25 is inserted into each slot 24. A coil 25 is wound on each tooth 23 and inserted into the slot 24 that sandwiches the tooth 23 on both sides in the circumferential direction.

[0022] The coil 25, wound in this manner around the teeth 23, has coil ends 25a and 25b extending axially outward from one end face 211 and the other end face 212 of the stator core 21. The coil 25 is a conductor made of copper or aluminum, which is highly conductive. In the example shown, the coil 25 is made of a relatively long wire with a circular cross-section perpendicular to its length.

[0023] In this embodiment, the stator core 21 has a plurality of segmented cores 31 divided circumferentially. The stator core 21 is divided, for example, according to each tooth 23 of the stator core 21. These segmented cores 31 are arranged circumferentially to form a cylindrical stator core 21. Two adjacent segmented cores 31 in the circumferential direction are arranged circumferentially such that their segmented surfaces 31s are in contact with each other.

[0024] Each segmented core 31 has a portion of the yoke 22 of the stator core 21 and a tooth 23 of the stator core 21. The portion of the segmented core 31 that forms the yoke 22 has an arc-shaped outer periphery 31a and a flat inner periphery 31b facing the slot 24. The tooth 23 has a pair of side portions 23a and 23b extending radially inward toward the rotor 12 from the portion of the segmented core 31 that forms the yoke 22, and a front end portion 23c connecting one end of these side portions 23a and 23b to each other. The front end portion 23c of the tooth 23 has a pair of protrusions 23d that project circumferentially to both sides and extend along the entire axial length of the segmented core 31.

[0025] The skeleton 26 is in the slot 24, covering the surface portion of the slot 24 relative to the coil 25 (hereinafter referred to as the slot surface portion). The slot surface portion is the face of the slot 24 facing the coil 25, and is defined by the inner peripheral portion 31b of the dividing core 31 and the surface portion of the teeth 23 adjacent to the slot 24 (the side portions 23a, 23b and the outer peripheral portion 23e of the protrusion 23d described later).

[0026] In other words, the frame 26 prevents the surface of the slot from being exposed relative to the portion of the coil 25 inserted into the slot 24. The frame 26 is made of an insulating material, such as polybutylene terephthalate (PBT) or liquid crystal polymer (LCP) or other insulating resin, and is located within the slot 24 between the surface of the slot and the coil 25. Thus, the stator core 21 and the coil 25 are insulated by the frame 26. That is, the frame 26 insulates the stator core 21 from the coil 25.

[0027] Each of the plurality of segmented iron cores 31 is provided with a frame 26. These frames 26 are arranged circumferentially, forming an overall ring concentric with the stator iron core 21. The plurality of frames 26 extend along the entire axial length of the corresponding segmented iron core 31.

[0028] The frame 26, within the segmented core 31, has a pair of mounting portions 26a and 26b respectively mounted on the inner periphery 31b of the segmented core 31, a pair of side portions 23a and 23b of the teeth 23, and the outer periphery 23e of the protrusion 23d. The pair of mounting portions 26a and 26b are formed integrally, for example, along the two edges of the base portion (not shown). The base portion is mounted on the end face of the segmented core 31, which corresponds to one end face 211 or the other end face 212 of the stator core 21.

[0029] The frame 26 has a contact portion 41 that contacts another frame 26 adjacent to it in the circumferential direction. That is, two frames 26 adjacent to each other in the circumferential direction are arranged in a circumferential configuration such that their contact portions 41 contact each other.

[0030] In the contact portions 41 of two adjacent skeletons 26 in the circumferential direction, one has an engaging portion that engages with the other, and the other has a engaged portion that engages with the engaging portion. The shape of these engaging portions and engaged portions can be any shape as long as they engage in the groove 24 in a way that allows them to cover the groove surface of the groove 24 relative to the coil 25.

[0031] exist Figure 2 as well as Figure 3 The image shows an example of the shape of the contact portion 41 in which two adjacent skeletons 26 in the circumferential direction come into contact with each other (first embodiment). Figure 3 It is shown in magnification Figure 2 The diagram shows the contact pattern of the contact portions 41 between two adjacent skeletons 26 in the circumferential direction.

[0032] exist Figure 2 as well as Figure 3 In the example shown, the engaging portion and the engaged portion of the contact portion 41 have a concave-convex shape. In the example shown, the engaging portion is a convex portion 42a, and the engaged portion is a concave portion 42b. Figure 3As shown, in the contact portions 41 of two adjacent skeletons 26 in the circumferential direction, one skeleton 26's contact portion 41 (the contact portion 41a of skeleton 261) has a protrusion 42a protruding toward the other skeleton 26's contact portion 41 (the contact portion 41b of skeleton 262) as an engaging portion. In contrast, the other skeleton 26's contact portion 41 (the contact portion 41b of skeleton 262) has a recess 42b into which the engaging portion, i.e., the protrusion 42a, of one skeleton 26's contact portion 41 (the contact portion 41a of skeleton 261) is inserted as an engaged portion.

[0033] The protrusion 42a extends along the inner periphery 31b of the segmented iron core 31 in the groove 24, passing over the contact portion 32 between the segmented surfaces 31s of adjacent segmented iron cores 31 in the circumferential direction. That is, the protrusion 42a extends along the inner periphery 31b of the segmented iron core 31 so that its front end passes over the contact portion 32.

[0034] In contrast, the contact portion 41 (41b) with the recess 42b extends along the inner periphery 31b of the segmented iron core 31 in the groove 24, with a portion of its front end substantially overlapping the contact portion 32, and the remaining portion of the front end not extending beyond the contact portion 32 but recessed at the recess 42b. In other words, the contact portion 41b extends along the inner periphery 31b of the segmented iron core 31 so that the front portion other than the recess 42b substantially overlaps with the contact portion 32.

[0035] In the example diagram, such as Figure 2 As shown, the six frames 26 corresponding to the six segmented iron cores 31 are arranged circumferentially, forming an overall ring concentric with the cylindrical stator iron core 21. These six frames 26 include two different shapes of contact portions 41: the first type of frame 261 and the second type of frame 262. The first type of frame 261 and the second type of frame 262 are arranged alternately in the circumferential direction.

[0036] In frame 261, both circumferentially oriented contact portions 41 have protrusions 42a. Conversely, in frame 262, both circumferentially oriented contact portions 41 have recesses 42b. That is, the contact portions 41 of frame 261 only have protrusions 42a serving as engaging portions, while the contact portions 41 of frame 262 only have recesses 42b serving as engaged portions. Figure 2 In the example shown, when the stator core 21 is composed of six segmented cores 31 with these frames 261, 262 configured, the assembly of these segmented cores 31 can be performed as follows.

[0037] For example, three segmented iron cores 31, each equipped with a skeleton 262 (i.e., the contact portion 41 having only a recess 42b), are arranged at equal intervals along the circumferential direction. Then, the three segmented iron cores 31, each equipped with a skeleton 261 (i.e., the contact portion 41 having only a protrusion 42a), are inserted one by one from the radially outer side between adjacent segmented iron cores 31 equipped with skeleton 262 in the circumferential direction. At this time, the protrusion 42a of the skeleton 261 is embedded into the recess 42b of the skeleton 262. This allows for efficient assembly of multiple segmented iron cores 31. In the assembled six segmented iron cores 31, the first type of skeleton 261 and the second type of skeleton 262 are arranged alternately in the circumferential direction.

[0038] According to this embodiment, two circumferentially adjacent skeletons 26 can be arranged in a circumferential configuration such that their contact portions 41 contact each other. In the contact portions 41 of the two circumferentially adjacent skeletons 26, one has a protrusion 42a as an engaging portion that engages with the other, and the other has a recess 42b as a engaged portion that engages with the engaging portion, i.e., the protrusion 42a. Therefore, in these contact portions 41, the protrusion 42a can be inserted into the recess 42b to engage with it. That is, with the protrusion 42a engaged with the recess 42b, the groove surface of the groove 24 can cover the coil 25 in the groove 24.

[0039] Therefore, proper insulation can be achieved between the stator core 21 and the coil 25 within the slot 24, and foreign matter can be prevented from entering from adjacent portions (contact portions 41) of the adjacent frames 26 in the circumferential direction. Thus, even in the case where the rotary motor 1 is used in the motor section of an air conditioner compressor (rotary compressor), foreign matter such as metal powder contained in the refrigerant can be prevented from adhering to the dividing surfaces 31s of the adjacent dividing cores 31 in the circumferential direction. Therefore, partial discharge can be avoided by preventing a short circuit in the insulation distance between the stator core 21 and the coil 25.

[0040] As described above, as long as the engaging portion and the engaged portion of the contact portion 41 can be configured in any shape and are not limited to any particular shape, as long as they can engage with the surface portion of the slot 24 (the inner peripheral portion 31b of the dividing core 31, the side portions 23a and 23b of the teeth 23, and the outer peripheral portion 23e of the protrusion 23d) relative to the coil 25, the coiling portion 24 can be covered by the coiling portion 25. Figure 2 as well as Figure 3 The first embodiment is shown. Hereinafter, the second and third embodiments, which differ from the first embodiment, will be described. In these embodiments, the structure of the rotary motor (stator and rotor), except for the shape of the engaging and engaged portions of the contact portion, is the same as that of the rotary motor 1 described above. Therefore, for the structure of the rotary motor in the second and third embodiments other than the contact portion, the description of the rotary motor 1 will be appropriately referred to and the description will be omitted.

[0041] Similar to the first embodiment described above, these second and third embodiments also enable proper insulation between the stator core 21 and the coil 25 within the slots 24, and prevent foreign objects from intruding from adjacent portions of the circumferentially adjacent frames. Furthermore, while the first embodiment is limited to a structure where the stator core 21 has an even number (six in the example shown) of slots 24 (in other words, six teeth 23), in the second and third embodiments, the number of slots 24 can be arbitrary, either even or odd.

[0042] (Second Implementation) Figure 4 This is a top view showing an example of the schematic structure of the rotary motor 102 according to the second embodiment from one side of the axial direction. Figure 5 It is shown in magnification Figure 4 The diagram shows the contact pattern of the contact portions 51 between two adjacent skeletons 66 in the circumferential direction.

[0043] Similar to the skeleton 26 in the first embodiment, the skeleton 66 in the segmented iron core 31 has a pair of mounting portions 66a and 66b respectively mounted on the inner peripheral portion 31b, a pair of side portions 23a and 23b of the tooth 23, and the outer peripheral portion 23e of the protrusion 23d.

[0044] exist Figure 4 as well as Figure 5 In the example shown, the engaging portion and the engaged portion of the contact portion 51 have a concave-convex shape. In the example shown, the engaging portion is a convex portion 52a, and the engaged portion is a concave portion 52b. Figure 5 As shown, in the contact portions 51 of two adjacent skeletons 66 in the circumferential direction, one skeleton 66's contact portion 51 (contact portion 51a) has a protrusion 52a protruding toward the other skeleton 66's contact portion 51 (contact portion 51b) as an engaging portion. In contrast, the other skeleton 66's contact portion 51 (contact portion 51b) has a recess 52b into which the engaging portion, i.e., the protrusion 52a, of one skeleton 66's contact portion 51 (contact portion 51a) is inserted as a engaged portion.

[0045] The protrusion 52a extends along the inner periphery 31b of the segmented iron core 31 in the groove 24, passing over the contact portion 32 between the segmented surfaces 31s of adjacent segmented iron cores 31 in the circumferential direction. That is, the protrusion 52a extends along the inner periphery 31b of the segmented iron core 31 so that its front end passes over the contact portion 32.

[0046] Similarly, the contact portion 51 (51b) with the recess 52b protrudes beyond the contact portion 32 along the inner periphery 31b of the segmented iron core 31 in the groove 24. That is, the contact portion 51b extends along the inner periphery 31b of the segmented iron core 31 so that its front end extends beyond the contact portion 32.

[0047] like Figure 4 As shown, all six skeletons 66 are of the same shape and do not constitute a structure that includes two different shapes of contact portions 51 (skeletons 261, 262) as in the first embodiment. However, the six skeletons 66 may also include skeletons with two different shapes of contact portions 51, similar to the first embodiment. For example, a mixture of skeletons with protrusions 52a at both ends of the circumferential contact portions 51 and skeletons with concave portions 52b at both ends of the circumferential contact portions 51 may exist.

[0048] (Third implementation) Figure 6 This is a top view showing an example of the schematic structure of the rotary motor 103 according to the third embodiment from one side of the axial direction. Figure 7 It is shown in magnification Figure 6 The diagram shows the contact pattern of the contact portions 71 between two adjacent skeletons 86 in the circumferential direction.

[0049] Similar to the skeleton 26 in the first embodiment, the skeleton 86 in the segmented iron core 31 has a pair of mounting portions 86a and 86b respectively mounted on the inner peripheral portion 31b, a pair of side portions 23a and 23b of the tooth 23 and the outer peripheral portion 23e of the protrusion 23d.

[0050] exist Figure 6 as well as Figure 7 In the example shown, the engaging portion and the engaged portion of the contact portion 71 have a concave-convex shape. In the example shown, the engaging portion is a convex portion 72a, and the engaged portion is a concave portion 72b. Figure 7 As shown, in the contact portions 71 of two adjacent skeletons 86 in the circumferential direction, one skeleton 86's contact portion 71 (contact portion 71a) has a protrusion 72a protruding toward the other skeleton 86's contact portion 71 (contact portion 71b) as an engaging portion. In contrast, the other skeleton 86's contact portion 71 (contact portion 71b) has a recess 72b into which the engaging portion, i.e., the protrusion 72a, of one skeleton 86's contact portion 71 (contact portion 71a) is inserted as a engaged portion.

[0051] The protrusion 72a extends along the inner periphery 31b of the segmented iron core 31 in the groove 24, passing over the contact portion 32 between the segmented surfaces 31s of adjacent segmented iron cores 31 in the circumferential direction. That is, the protrusion 72a extends along the inner periphery 31b of the segmented iron core 31 so that its front end passes over the contact portion 32.

[0052] In contrast, the contact portion 71 (71b) with the recess 72b is recessed along the inner periphery 31b of the segmented core 31 in the groove 24, without extending beyond the contact portion 32, with the front end of the contact portion 71b entirely recessed at the recess 72b. In other words, the contact portion 41b extends along the inner periphery 31b of the segmented core 31 in such a way that its front end does not extend beyond the contact portion 32.

[0053] like Figure 6 As shown, these six skeletons 86 are all of the same form as the skeleton 66 in the second embodiment, and do not constitute a structure that includes two forms (skeletons 261, 262) with different shapes of contact portions 71 as in the first embodiment. However, the six skeletons 86 may also include skeletons with two forms of contact portions 71 with different shapes, just like in the first embodiment. For example, a mixture of skeletons with protrusions 72a at both ends of the circumferential contact portions 71 and skeletons with concave portions 72b at both ends of the circumferential contact portions 71 may exist.

[0054] Several embodiments of the present invention have been described above, but these embodiments are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included within the scope and spirit of the invention, and are included within the scope of the invention as described in the claims and its equivalents.

[0055] Explanation of reference numerals in the attached figures 1 Rotary electric motor 11 Stator 12 rotors 13 Rotation axis 21 Stator Core 22 Magnetic yoke 23 teeth The sides of teeth 23a and 23b The front end of tooth 23c The protrusion at the front end of tooth 23d The outer periphery of the protrusion of tooth 23e 24 slots 25 coils 25a and 25b coil ends 26, 66, 86, 261, 262 skeletons Mounting parts for frames 26a, 26b, 66a, 66b, 86a, and 86b 31. Segmented iron core 31a The outer periphery of the segmented iron core 31b Inner circumference of the segmented iron core 31s segmentation plane 32. Contact points between the dividing surfaces Contact parts 41, 41a, 41b, 51, 51a, 51b, 71, 71a, 71b 42a, 52a, 72a convex part 42b, 52b, 72b concave part 211 One end face of the stator core 212 The other end face of the stator core 261. First Form of Skeleton 262. Skeleton in Form 2 O1 is the central axis of the rotation axis.

Claims

1. A stator for a rotary electric motor, characterized in that, have: The annular stator core has 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 is wound around the teeth; as well as Multiple skeletons, in the grooves between adjacent teeth in the circumferential direction, cover the surface portion of the groove relative to the coil. The stator core has multiple segmented cores divided along the circumferential direction. The skeleton is disposed in each of the plurality of segmented iron cores and has a contact portion that contacts the skeleton adjacent in the circumferential direction. In the contact portions of the adjacent skeletons in the circumferential direction, one has an engaging portion that engages with the other, and the other has a engaged portion that engages with the engaging portion.

2. The stator of the rotary electric motor as described in claim 1, characterized in that, The engaging portion is a protrusion that extends along the inner circumference of the segmented iron core in the groove, past the contact points between adjacent segmented iron cores in the circumferential direction. The engaging portion is a recess into which the protrusion is inserted. The contact portion having the recess extends along the inner periphery of the segmented iron core in the groove, such that the front end portion other than the recess substantially overlaps with the contact portion.

3. The stator of the rotary electric motor as described in claim 2, characterized in that, The plurality of said skeletons include a first type of skeleton having only the protrusion as the contact portion, and a second type of skeleton having only the concave portion as the contact portion. The skeleton of the first form and the skeleton of the second form are alternately arranged in the circumferential direction.

4. The stator of the rotary electric motor as described in claim 1, characterized in that, The engaging portion is a protrusion that extends along the inner circumference of the segmented iron core in the groove, past the contact points between adjacent segmented iron cores in the circumferential direction. The engaging portion is a recess into which the protrusion is inserted. The contact portion having the recess extends along the inner periphery of the segmented iron core in the groove, such that the front end portion other than the recess extends beyond the contact portion.

5. The stator of the rotary electric motor as described in claim 1, characterized in that, The engaging portion is a protrusion that extends along the inner circumference of the segmented iron core in the groove, past the contact points between adjacent segmented iron cores in the circumferential direction. The engaging portion is a recess into which the protrusion is inserted. The contact portion having the recess extends along the inner periphery of the segmented iron core in the groove in such a way that the front end portion as a whole does not extend beyond the contact portion.

6. The stator of the rotary electric motor as described in claim 4 or 5, characterized in that, Each of the plurality of said skeletons has the same shape: a protrusion on one side of the circumferential direction as the contact portion, and a recess on the other side of the circumferential direction as the contact portion.

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