Stator and method for manufacturing stator

Abstract

A stator (1) is provided with an annular stator core (10) and a coil (30) attached to the stator core (10). The stator core (10) has a plurality of slots (15) arranged side by side in the circumferential direction of the stator core (10), and extending portions (21, 22) extending from inner walls on both sides of the slots (15) in the circumferential direction. The coil (30) has an insertion part (31) inserted into the slot (15). The insertion section (31) is disposed between the extending sections (21, 22) on both sides in the circumferential direction in a state of being in contact with at least one of the extending sections (21, 22).

Description

Technical Field

[0001] This disclosure relates to a stator and a method for manufacturing the stator. Background Technology

[0002] Patent Document 1 discloses a molded motor having a stator. The stator has a stator core with a plurality of circumferentially arranged poles and a plurality of coils wound to each pole of the stator core via an insulating material. The coil windings pass through slots formed between the poles and are wound to the poles. Existing technical documents Patent documents

[0003] Patent Document 1: International Publication No. 2019 / 220956 Summary of the Invention The problem that the invention aims to solve

[0004] As in Patent Document 1, in a structure where the coil has a through portion that extends into a slot, it is desirable that the through portion does not shift circumferentially within the slot, and there is room for improvement in this regard.

[0005] One of the objectives of this disclosure is to provide a technique that can suppress circumferential displacement of the insertion portion of a coil inserted into a slot. Solution for solving the problem

[0006] The stator disclosed herein has the following features: The stator core is ring-shaped; and The coil is mounted on the stator core. The stator core has a plurality of slots arranged circumferentially along the stator core, and protrusions extending from the inner walls on both sides of the slots in the circumferential direction. The coil has a through portion that inserts into the slot. The insertion portion is configured between the protrusions on both circumferential sides in a state of contact with at least one of the protrusions.

[0007] The stator manufacturing method disclosed herein includes preparation steps for preparing a toroidal stator core and coil segments. The stator core has a plurality of slots arranged circumferentially along the stator core, and protrusions extending from the inner walls on both sides of the slots in the circumferential direction. The coil segment has a through portion that inserts into the slot. The method further includes a insertion process in which the insertion portion is inserted into the slot from one axial side of the stator core in such a way that the insertion portion passes between the protrusions on both circumferential sides. Invention Effects

[0008] The description disclosed herein is capable of suppressing circumferential displacement of the insertion portion of the coil inserted into the slot. Attached Figure Description

[0009] Figure 1 This is a perspective view of the stator core of the first embodiment. Figure 2 This is a cross-sectional view of the stator of the first embodiment, cut along its axial center. Figure 3 This is a top view of the stator core of the first embodiment in which the protrusion is in a state without flexural deformation, and a partial enlarged view of the area around the slot. Figure 4 This is an explanatory diagram showing the state before the coil segments are inserted into the slots. Figure 5 This is an explanatory diagram showing the state in which the coil segments have been inserted into the slots. Figure 6 This is an explanatory diagram showing the state of resin material being filled into the slot. Figure 7 It is a cross-sectional view showing the structure inside the slot. Figure 8 This is a cross-sectional view of the stator of the second embodiment, cut along its axial center. Figure 9 This is a top view of the stator core in the second embodiment where the protrusion is in a state without flexural deformation, and a partial enlarged view of the area around the slot. Detailed Implementation

[0010] The following are examples illustrating embodiments of this disclosure.

[0011] [1] A stator having: The stator core is ring-shaped; and The coil is mounted on the stator core. The stator core has a plurality of slots arranged circumferentially along the stator core, and protrusions extending from the inner walls on both sides of the slots in the circumferential direction. The coil has a through portion that inserts into the slot. The insertion portion is configured between the protrusions on both circumferential sides in a state of contact with at least one of the protrusions.

[0012] The insertion portion restricts displacement toward the protruding part by means of a protrusion that contacts itself. Therefore, the stator described above can suppress circumferential displacement of the insertion portion of the coil inserted into the slot.

[0013] [2] According to the stator described in [1], wherein, The insertion portion is configured to contact the protrusions on both sides of the circumferential direction.

[0014] The through-hole restricts circumferential displacement on both sides through its protrusions. Therefore, the stator described above can suppress circumferential displacement of the through-hole.

[0015] [3] According to the stator described in [1] or [2], wherein, Within the slot, a plurality of the insertion portions are arranged radially along the stator core. The protrusions on both sides of the circumference are located between each of the insertion portions and the inner walls on both sides of the circumference, and the plurality of insertion portions are continuous along the arrangement direction.

[0016] The stator described above can continuously block the gap between the inner wall of the slot and each insertion part in the arrangement direction of the multiple insertion parts through the protrusion.

[0017] [4] According to the stator described in [1] or [2], wherein, Within the slot, a plurality of the insertion portions are arranged radially along the stator core. The protrusions on both sides of the circumference have individual protrusions respectively corresponding to each of the insertion portions. Each of the individual protrusions is configured such that at least one of the individual protrusions on both sides of the circumferential direction is in contact with the insertion portion corresponding to itself.

[0018] The stator described above can suppress the circumferential displacement of each insertion part by means of individual protrusions provided respectively corresponding to each insertion part.

[0019] [5] According to the stator described in [2], wherein, At least one of the protruding portions on both circumferential sides that are in contact with the insertion portion is configured such that its convex surface is flexed and bent by being pushed by the insertion portion and is in contact with the insertion portion.

[0020] The stator described above can more firmly restrict circumferential displacement through the reaction force from at least one of the protruding portions. Therefore, the stator can more reliably suppress circumferential displacement of the insertion portion.

[0021] [6] According to the stator described in [5], wherein, The insertion portion has a conductor portion and a covering portion that covers the outer periphery of the conductor portion. The convex surface is configured to contact the surface of the covering portion.

[0022] In structures where the insertion portion has a covering portion, there is a concern that the covering portion may be damaged due to the protruding portion contacting the covering portion. Since the stator is configured such that the convex surface of the protruding portion contacts the surface of the covering portion, damage to the covering portion due to contact between the protruding portion and the covering portion can be suppressed.

[0023] [7] The stator according to any one of [1] to [6], wherein, The stator core has an annular yoke and a plurality of teeth arranged in a ring along the yoke. Each of the slots is formed by the yoke and two adjacent teeth. The yoke and the plurality of teeth are formed by stacking multiple electromagnetic steel plates along the axial direction of the stator core and forming a single unit. The protrusion is integrally formed with the toothed portion via the electromagnetic steel plate.

[0024] The stator core described above can have its protrusions formed in a way that reduces the number of components, since the protrusions are integrated with the electromagnetic steel plate and teeth that constitute the yoke and teeth.

[0025] [8] The stator according to any one of [1] to [7], wherein, The protrusions are arranged on both sides within the slot along the axial direction of the stator core. The insertion portion is configured to contact at least one of the protrusions on the axial sides of the slot.

[0026] The insertion portion is located on both axial sides within the slot, and its displacement towards one side is restricted by the protrusion that contacts it. Therefore, the stator described above can suppress circumferential displacement of the insertion portion on both axial sides within the slot.

[0027] [9] According to the stator described in [8], wherein, Furthermore, it contains insulating resin that is filled into the slot. The insulating resin has a continuous filling portion between the protrusions on both axial sides and between the inner walls and the insertion portion on both circumferential sides.

[0028] Because the stator has no insulating paper inserted between the inner wall of the slot and the insertion part in the continuous filling part, the heat of the insertion part can be easily transferred to the stator core through the insulating resin, thus making it easier to dissipate the heat of the coil.

[0029]

[10] A method for manufacturing a stator, comprising a preparation step of preparing an annular stator core and coil segments, The stator core has a plurality of slots arranged circumferentially along the stator core, and protrusions extending from the inner walls on both sides of the slots in the circumferential direction. The coil segment has a through portion that inserts into the slot. The method further includes a insertion process in which the insertion portion is inserted into the slot from one axial side of the stator core in such a way that the insertion portion passes between the protrusions on both circumferential sides.

[0030] According to the stator manufacturing method described above, when the insertion part is inserted into the slot, the displacement of the insertion part in the circumferential direction can be limited by the protruding parts on both sides of the circumferential direction. Furthermore, even when the insertion part is disposed within the slot, the displacement of the insertion part in the circumferential direction can be limited by the protruding parts on both sides of the circumferential direction. That is, according to the stator manufacturing method described above, it is possible to suppress the circumferential displacement of the insertion part of the coil segment constituting the coil.

[0031]

[11] According to the stator manufacturing method described in

[10] , wherein, The protrusion is positioned on both sides within the slot along the axial direction and is capable of flexing and deforming with the portion supported on the inner wall as a fulcrum. The distance between the protruding portions on both sides of the circumference, when they are in a state without flexural deformation, is less than the width of the insertion portion. In the insertion process, the insertion portion is inserted into the slot from one axial side by passing between the protrusions on both circumferential sides within the slot on both axial sides. The method further includes a filling process in which resin material is filled between the protrusions on both axial sides within the slot, with the insertion portion disposed between the protrusions on both circumferential sides.

[0032] According to the above stator manufacturing method, the leakage of resin material can be suppressed by the protrusions on both sides of the axial direction, and the resin material can be filled into the slot.

[0033]

[12] According to the stator manufacturing method described in

[11] , wherein, Within the slot, a plurality of the insertion portions are arranged radially along the stator core. The protruding portions on both circumferential sides are located between each of the insertion portions and the inner wall, and the plurality of insertion portions are continuous along the arrangement direction. In the filling process, resin material is filled between the protrusions on both sides of the axial direction, with each of the insertion portions disposed between the protrusions on both sides of the circumferential direction.

[0034] According to the above stator manufacturing method, the gap between each insertion part and the inner wall can be continuously covered by the protrusions on both sides of the axial direction in the arrangement direction of the multiple insertion parts, and resin material can be filled into the slot.

[0035] <First Embodiment> 1. Structure of Stator 1 In the first embodiment, the stator 1 is used as a component of a rotary electric machine (specifically, an electric motor). The stator 1 is annular, more specifically, circular. Figure 2 and Figure 7 As shown, the stator 1 includes a stator core 10, a coil 30, and an insulating resin 40.

[0036] like Figure 1 As shown, the stator core 10 is annular, or more specifically, circular. Hereinafter, the radial direction of the stator core 10 will be referred to as the radial direction, the axial direction as the axial direction, and the circumferential direction as the circumferential direction. Furthermore, in... Figure 1 In the middle, protruding parts 21 and 22 (see Figure 7 () is omitted.

[0037] like Figure 1 and Figure 2 As shown, the stator core 10 has a yoke 11 and a plurality of teeth 12. The yoke 11 is annular, more specifically, circular. A plurality of teeth 12 are arranged in a ring along the inner circumferential surface of the yoke 11. Each tooth 12 is spaced apart from each other in the circumferential direction. Each tooth 12 protrudes radially inward from the inner circumference of the yoke 11. Each tooth 12 is wall-shaped in both the radial and axial directions. Each tooth 12 has a wall-shaped tooth body 13 in both the radial and axial directions, and tooth extensions 14 extending circumferentially from the top end (in other words, the radially inward end) of the tooth body 13. The yoke 11 and the plurality of teeth 12 are integrally formed by stacking a plurality of electromagnetic steel plates (e.g., silicon steel plates) along the axial direction of the stator core 10.

[0038] like Figure 1 As shown, the stator core 10 has a plurality of slots 15. The plurality of slots 15 are arranged circumferentially in a ring. The slots 15 penetrate the stator core 10 axially. Figure 2 and Figure 7 As shown, slot 15 has a first opening 16, a second opening 17, and a third opening 18. The first opening 16 is formed on the surface of the stator core 10 on one axial side. The second opening 17 is formed on the surface of the stator core 10 on the other axial side. The third opening 18 is formed on the radially inner surface of the stator core 10. The third opening 18 is continuous with the first opening 16 and the second opening 17. Figure 2 As shown, each slot 15 is defined by a yoke 11 and two adjacent teeth 12.

[0039] like Figure 2 and Figure 7 As shown, the stator core 10 has protrusions 21 and 22 extending from the inner walls of the slots 15 on both circumferential sides. The protrusions 21 and 22 are cantilevered against the inner walls of the slots 15 and can flexurally deform around the points supported on the inner walls. The protrusions 21 and 22 are located on both axial sides within the slots 15. The protrusions 21 and 22 are located within each slot 15. The protrusions 21 and 22 are integrally formed with the teeth 12 by means of an electromagnetic steel plate forming the teeth 12. According to this structure, the stator core 10 can form the protrusions 21 and 22 in a manner that minimizes the number of components.

[0040] Coil 30 is mounted on stator core 10. Coil 30 is wound around stator core 10 (more specifically, tooth 12). Coil 30 can be distributed wound or concentrated wound. In the case of distributed winding, it can be wavy winding, concentric winding, or overlapping winding. In this embodiment, coil 30 will be described as wavy winding. Coil 30 passes through slot 15 and is wound around tooth 12. Coil 30 is composed of a covered wire whose outer periphery is covered with a covering material. In this embodiment, coil 30 is a flat wire. However, coil 30 may not be a flat wire; for example, it may be a round wire. Figure 2 As shown, the cross-section of coil 30 cut in a direction orthogonal to the length direction of coil 30 is rectangular.

[0041] The coil 30 has a through-hole 31 that inserts into the slot 15. The through-hole 31 is constructed of a sheathed wire. The through-hole 31 extends axially into the slot 15. The through-hole 31 is straight. One end of the through-hole 31 protrudes axially from one end of the slot 15 (i.e., the first opening 16). The other end of the through-hole 31 protrudes axially from the other end of the slot 15 (i.e., the second opening 17). The through-hole 31 is constructed of a flat wire. Figure 2 As shown, the insertion portion 31 has a rectangular cross-section when cut in a direction orthogonal to its length (axial direction). The insertion portion 31 is composed of a sheathed wire whose outer periphery is covered by a sheathing material. The insertion portion 31 has a conductor portion 32 and a sheathing portion 33 covering the outer periphery of the conductor portion 32.

[0042] The conductor portion 32 is conductive. The conductor portion 32 is constructed using a core wire that covers an electrical wire. For example... Figure 7 As shown, the conductor portion 32 extends in a straight line. The conductor portion 32 extends axially. Figure 2 As shown, the cross-section of the conductor portion 32 cut in a direction orthogonal to the length direction of the conductor portion 32 is rectangular.

[0043] The sheathing portion 33 is insulating. The sheathing portion 33 is constructed using the same sheathing material used for sheathing wires. The material of the sheathing portion 33 is not particularly limited. In this embodiment, the sheathing portion 33 is a low-dielectric-constant enamel. The main component of the sheathing portion 33 can be a thermosetting resin, such as polyvinyl formal, thermosetting polyurethane, thermosetting acrylic resin, epoxy resin, thermosetting polyester, thermosetting polyesterimide, aromatic polyamide, thermosetting polyamide-imide, thermosetting polyimide, etc. Alternatively, the main component of the sheathing portion can also be a thermoplastic resin, such as polyetherimide, polyphenylene ether, polyethersulfone, polyphenylene sulfide, polyetheretherketone, or thermoplastic polyimide, etc. "Main component" refers to the component with the highest content, for example, a component containing 50% by mass or more.

[0044] like Figure 2 As shown in slot 15B, insulating resin 40 is filled into slot 15. The insulating resin 40 has a continuous filling portion 41 at the axial center of the stator core 10, continuously filling the space between the inner wall of slot 15 and the insertion portion 31. The continuous filling portion 41 is continuously filled between the protrusions 21 and 22 on both axial sides within slot 15. According to this structure, since no insulating paper is inserted between the inner wall of slot 15 and the insertion portion 31 in the continuous filling portion 41, the heat from the insertion portion 31 can be easily transferred to the stator core 10 via the insulating resin 40, thereby easily dissipating the heat from the coil 30.

[0045] like Figure 7 As shown, the insertion portion 31 is disposed between the protrusions 21 and 22 on both circumferential sides. The insertion portion 31 is disposed in contact with the protrusions 21 and 22 on both circumferential sides. According to this structure, the insertion portion 31 restricts the displacement on both circumferential sides by means of the protrusions 21 and 22 on both circumferential sides. Therefore, the stator 1 can suppress the displacement of the insertion portion 31 on both circumferential sides.

[0046] Furthermore, such as Figure 7 As shown, the insertion portion 31 is arranged on both axial sides in contact with the protrusions 21 and 22 on both circumferential sides. According to this structure, the insertion portion 31, located on both axial sides within the slot 15, has its displacement towards the protrusions 21 and 22 restricted by the protrusions 21 and 22 in contact with it. Therefore, the stator 1 can suppress circumferential displacement of the insertion portion 31 on both sides within the slot 15.

[0047] like Figure 2 As shown, within the slot 15, a plurality of (four in this embodiment) insertion portions 31 are arranged radially. Furthermore, in Figure 2In the diagram, the insulating resin 40 is omitted in slot 15A, while slot 15B indicates that the insulating resin 40 has been filled. The protrusions 21 and 22 on both circumferential sides are located between each insertion part 31 and the inner walls of both circumferential sides of slot 15, and are continuous in the direction in which the multiple insertion parts 31 are arranged. According to this structure, the stator 1 can continuously seal the gap between the inner walls of both axial sides of slot 15 and each insertion part 31 in the direction in which the multiple insertion parts 31 are arranged via the protrusions 21 and 22.

[0048] The radial length of the protrusions 21 and 22 is greater than the radial length (width) of the insertion portion 31 multiplied by the number of insertion portions 31 arranged radially within the slot 15. The radially inner ends of the protrusions 21 and 22 are positioned radially inner than the insertion portion 31 positioned at the outermost radial side. The radially outer ends of the protrusions 21 and 22 are positioned radially outer than the insertion portion 31 positioned at the outermost radial side.

[0049] like Figure 7 As shown, the protruding portions 21 and 22 on both circumferential sides that contact the insertion portion 31 are flexed and bent by the insertion portion 31. The bent convex surfaces 21A and 22A of the protruding portions 21 and 22 are arranged in contact with the insertion portion 31. The bent convex surfaces 21A and 22A of the protruding portions 21 and 22 are arranged on both axial sides in contact with the insertion portion 31. According to this structure, the stator 1 can more firmly restrict displacement to both circumferential sides by the reaction force from the protruding portions 21 and 22 on both circumferential sides. Therefore, the stator 1 can more reliably suppress displacement of the insertion portion 31 to both circumferential sides.

[0050] like Figure 2 and Figure 7 As shown, the convex surfaces 21A and 22A of the protrusions 21 and 22 are arranged in contact with the surface of the covering portion 33 of the insertion portion 31. In a structure where the insertion portion 31 has a covering portion 33, there is a concern that the covering portion 33 may be damaged due to contact between the protrusions 21 and 22 and the covering portion 33. Since the stator 1 is arranged so that the convex surfaces 21A and 22A of the protrusions 21 and 22 are in contact with the surface of the covering portion 33, damage to the covering portion 33 caused by contact between the protrusions 21 and 22 can be suppressed.

[0051] exist Figure 7 In the example shown, the protrusions 21 and 22 on one axial side are entirely disposed within the slot 15, while the protrusions 21 and 22 on the other axial side extend to the outside of the slot 15. However, the protrusions 21 and 22 on both axial sides can be entirely disposed within the slot 15, and the protrusions 21 and 22 on both axial sides can also extend to the outside of the slot 15.

[0052] 2. Manufacturing method of stator 1 The manufacturing method of stator 1 includes preparation process, insertion process, filling process, bending process and welding process.

[0053] In the preparation process, the stator core 10 and coil segments 50 described above are prepared. For example... Figure 3 As shown, the protrusions 21 and 22 of the stator core 10 are radially elongated rectangles in a state where no flexural deformation occurs. The interval GA between the protrusions 21 and 22 on both circumferential sides in a state where no flexural deformation occurs is smaller than the width of the insertion portion 31. That is, the width of the insertion portion 31 (more specifically, the width of the insertion portion 31 in a direction orthogonal to the axial direction and orthogonal to the arrangement direction of the plurality of insertion portions 31) is smaller than the interval GB between the inner walls on both circumferential sides of the slot 15, and larger than the interval GA between the protrusions 21 and 22 on both circumferential sides in a state where no flexural deformation occurs. The coil segment 50 is, for example, U-shaped and has two insertion portions 31.

[0054] In the insertion process, such as Figure 4 and Figure 5 As shown, the insertion portion 31 is inserted into the slot 15 from one axial side of the stator core 10, such that it passes between the protrusions 21 and 22 on both circumferential sides. According to this method, when the insertion portion 31 is inserted into the slot 15, its displacement to both circumferential sides can be limited by the protrusions 21 and 22 on both sides. Furthermore, even when the insertion portion 31 is positioned within the slot 15, its displacement to both circumferential sides can be limited by the protrusions 21 and 22 on both circumferential sides. That is, according to this method, circumferential displacement of the insertion portion 31 constituting the coil segment 50 of the coil 30 can be suppressed.

[0055] During the insertion process, when the insertion part 31 is inserted into the slot 15, the protrusions 21 and 22 on both circumferential sides are flexed and deformed by the insertion part 31 while the insertion part 31 is inserted between the protrusions 21 and 22. According to this method, the insertion part 31 approaches the circumferential center side of the slot 15 under the action of the protrusions 21 and 22 on both circumferential sides. Therefore, it is possible to prevent the covering part 33 of the insertion part 31 from contacting the opening end of the slot 15 and being damaged.

[0056] In the insertion process, the insertion part 31 is inserted into the slot 15 from one axial side by passing between the protrusions 21 and 22 on both circumferential sides within the slot 15 on both axial sides. Accordingly, the gap between the inner wall of the slot 15 and the insertion part 31 on both circumferential sides within the slot 15 can be sealed on both axial sides.

[0057] During the insertion process, the two insertion parts 31 of the coil segment 50 are inserted into different slots 15. Each slot 15 has four insertion parts 31 inserted into it.

[0058] In the filling process, such as Figure 6 As shown, resin material 61 is filled between the protrusions 21 and 22 on both axial sides within the slot 15, with the insertion portion 31 positioned between the protrusions 21 and 22 on both circumferential sides. According to this method, leakage of resin material 61 can be suppressed by the protrusions 21 and 22 on both axial sides, and resin material 61 can be filled into the slot 15. The resin material 61 cures to become insulating resin 40. Furthermore, the protrusions 21 and 22 on both circumferential sides are located between each insertion portion 31 and the inner walls on both circumferential sides of the slot 15, and are continuous in the direction in which the plurality of insertion portions 31 are arranged. Therefore, the protrusions 21 and 22 on both axial sides can continuously cover the gap between each insertion portion 31 and the inner walls on both circumferential sides in the direction in which the plurality of insertion portions 31 are arranged, and resin material 61 can be filled into the slot 15.

[0059] In the filling process, the filling device 60, which dispenses resin material 61, is disposed in the inner space of the annular stator core 10. Furthermore, except for the injection port 62 of the resin material 61, the filling device 60 covers the radially inner opening (third opening 18) of the slot 15 through its cover 63. The injection port 62 of the resin material 61 is axially disposed between the protrusions 21 and 22 on both axial sides. The filling device 60 fills the space between the protrusions 21 and 22 on both axial sides by filling the resin material 61 through the injection port 62. The resin material 61 can be filled sequentially into each slot by intermittently rotating the filling device 60, or all slots 15 can be filled at once.

[0060] In the bending process, the portion of the coil segment 50 protruding from the other side of the slot 15 is bent. In the welding process, the bent portions of the coil segments 50, which are inserted into different slots 15, are welded together. After these processes, such as Figure 7 As shown, the manufacturing of stator 1 is complete.

[0061] <Second Implementation> In the second embodiment, an example is described where the protrusion has an individual protrusion provided corresponding to each insertion part. Furthermore, in the description of the second embodiment, structures identical to those in the first embodiment are labeled with the same symbols, and detailed descriptions are omitted.

[0062] Figure 8 The stator 201 shown includes a stator core 210, a coil 30, and insulating resin 40. The stator core 210 has a yoke 11, a plurality of teeth 12, and a plurality of slots 15. The stator core 210 has protrusions 221 and 222 extending from the inner walls of the slots 15 on both sides in a circumferential direction.

[0063] Within the slot 15, a plurality of insertion portions 31 are arranged radially along the stator core 210. The protrusions 221 and 222 on both circumferential sides have individual protrusions 223 and 224 respectively corresponding to each insertion portion 31. The individual protrusions 223 and 224 on both circumferential sides are arranged in contact with their respective insertion portions 31. According to this structure, the stator 201 can suppress the displacement of each insertion portion 31 to both circumferential sides by means of the individual protrusions 223 and 224 respectively corresponding to each insertion portion 31.

[0064] The manufacturing method of stator 201 is the same as that of stator 1 in the first embodiment, but due to the structural differences, the following differences occur.

[0065] Each individual protrusion 223, 224 is disposed between the inner walls of the corresponding insertion portion 31 and the slot 15 on both circumferential sides, and can independently undergo flexural deformation with the portion supported on the inner wall as a fulcrum. For example... Figure 9 As shown, the individual protrusions 223 and 224 are radially elongated rectangles when they are in a state without flexural deformation. When the individual protrusions 223 and 224 are in a state without flexural deformation, the interval GC between the individual protrusions 223 and 224 on both circumferential sides is smaller than the width of the insertion portion 31. That is, the width of the insertion portion 31 (more specifically, the width of the insertion portion 31 in a direction orthogonal to the axial direction and orthogonal to the arrangement direction of the plurality of insertion portions 31) is smaller than the interval GB between the inner walls on both circumferential sides of the slot 15, and larger than the interval GC between the individual protrusions 223 and 224 on both circumferential sides when they are in a state without flexural deformation.

[0066] During the insertion process, when the insertion part 31 is inserted into the slot 15, the insertion part 31 is inserted between the individual protrusions 223 and 224 while causing them to flex and deform through the insertion part 31. According to this method, since each individual protrusion 223 and 224 is individually displaced according to the position of its corresponding insertion part 31, it is difficult to create a gap between the protrusions 221 and 222 and the insertion part 31 in the circumferential direction.

[0067] <Other Implementation Methods> This disclosure is not limited to the embodiments described above and in the accompanying drawings. For example, the features of the embodiments described above or later can be combined arbitrarily without contradiction. Furthermore, all features of the embodiments described above or later, unless explicitly stated as essential, can be omitted. Further, the above embodiments can be modified as follows.

[0068] In the above embodiments, the protrusion and the teeth are formed as a single component, but the protrusion and the teeth can also be formed as different components.

[0069] In the above embodiments, the insertion part and the protrusions on both sides of the circumference are in contact, but it is also possible to have a structure in contact with only one side of the protrusion.

[0070] In the above embodiments, the protrusions on both sides of the circumference are flexed and bent, but it can also be a structure in which only one side of the protrusions on both sides of the circumference is flexed and bent, or it can be a structure in which none of them are bent.

[0071] In the above embodiments, the convex surface of the protruding part contacts the insertion part, but it can also be a structure in which the protruding end of the protruding part contacts the insertion part.

[0072] Furthermore, the embodiments disclosed herein should be considered exemplary in all respects and not restrictive. The scope of the invention is not limited to the embodiments disclosed herein and is intended to include all modifications within the scope shown by or equivalent to the claims. Explanation of reference numerals in the attached figures

[0073] 1…Stator 10…Stator core 11...yoke part 12…teeth 13… Tooth body 14…tooth protrusion 15… slots 15A… slot 15B… slot 16…First opening 17…Second opening 18… Third opening 21…protruding part 21A…convex surface 22…protruding part 22A…convex surface 30… coil 31… Insertion Section 32…Conductor section 33… Covering section 40…Insulating resin 41…Continuous filling section 44… Covering section 50…coil segmentation 60…filling device 61…Resin material 62…Injection Port 63…cover 201…Stator 210…Stator core 221…protruding part 222…protruding part 223… Individual protruding parts 224… Individual protruding parts

Claims

1. A stator, comprising: a stator core in the shape of a ring; and The coil is mounted on the stator core. The stator core has a plurality of slots arranged along the circumferential direction of the stator core, and extensions extending from inner walls on both sides of the slots in the circumferential direction. The coil has an insertion portion inserted into the slot, The insertion portion is disposed between the protruding portions on both sides in the circumferential direction in a state of being in contact with at least one of the protruding portions.

2. The stator according to claim 1, wherein: The insertion portion is arranged in a state of being in contact with the protruding portions on both sides in the circumferential direction.

3. The stator according to claim 1 or claim 2, wherein: In the slot, a plurality of the insertion portions are arranged in a radial direction of the stator core. The protruding portions on both sides in the circumferential direction are interposed between each of the insertion portions and the inner walls on both sides in the circumferential direction, and a plurality of the insertion portions are continuous along an arrangement direction.

4. The stator according to claim 1 or claim 2, wherein: In the slot, a plurality of the insertion portions are arranged in a radial direction of the stator core. The protruding portions on both sides of the circumferential direction have individual protruding portions respectively provided corresponding to each of the insertion portions. Each of the individual protruding portions is arranged in a state where at least one of the individual protruding portions on both sides in the circumferential direction is in contact with the insertion portion corresponding to the individual protruding portion.

5. The stator according to claim 2, wherein: At least one of the protruding portions on both sides in the circumferential direction that are in contact with the insertion portion is arranged in a state where it is pressed by the insertion portion to bend and deform, and the curved convex surface is in contact with the insertion portion.

6. The stator according to claim 5, wherein: The insertion portion includes a conductor portion and a covering portion covering an outer circumference of the conductor portion. The convex surface is arranged in contact with the surface of the covering portion.

7. The stator according to claim 1 or claim 2, wherein: The stator core has an annular yoke and a plurality of teeth arranged in an annular shape along the yoke. Each of the slots is defined by the yoke and two adjacent teeth. The yoke and the plurality of teeth are formed integrally by laminating a plurality of electromagnetic steel sheets in the axial direction of the stator core. The protruding portion is formed integrally with the tooth portion through the electromagnetic steel sheet.

8. The stator according to claim 1 or claim 2, wherein: The protruding portion is arranged on both sides of the slot in the axial direction of the stator core. The insertion portion is arranged on both sides in the axial direction in the slot so as to be in contact with at least one of the protruding portions on both sides in the circumferential direction.

9. The stator according to claim 8, wherein: further comprising an insulating resin filled in the slot, The insulating resin has a continuous filling portion that is continuously filled between the protruding portions on both sides in the axial direction and between the inner wall and the insertion portion on both sides in the circumferential direction.

10. A method for manufacturing a stator, comprising the steps of preparing an annular stator core and coil segments, The stator core has a plurality of slots arranged along the circumferential direction of the stator core, and extensions extending from inner walls on both sides of the slots in the circumferential direction. The coil segment has an insertion portion inserted into the slot, The method further includes an inserting step of inserting the inserting portion into the slot from one axial side of the stator core so that the inserting portion passes between the protruding portions on both sides in the circumferential direction.

11. The method for manufacturing a stator according to claim 10, wherein: The protruding portion is arranged on both sides of the slot in the axial direction and can be bent and deformed with the portion supported by the inner wall as a fulcrum. The distance between the protruding portions on both sides of the circumferential direction in a state without flexural deformation is smaller than the width of the insertion portion. In the insertion step, the insertion portion is inserted into the slot from one axial side in such a manner that the insertion portion passes between the protruding portions on both circumferential sides on both axial sides in the slot. The method further includes a filling step of filling a resin material between the protruding portions on both sides in the axial direction in the slot in a state where the insertion portion is arranged between the protruding portions on both sides in the circumferential direction.

12. The method for manufacturing a stator according to claim 11, wherein: In the slot, a plurality of the insertion portions are arranged in a radial direction of the stator core. The protruding portions on both sides of the circumferential direction are between each of the insertion portions and the inner wall, and a plurality of the insertion portions are continuous along the arrangement direction. In the filling step, the resin material is filled between the protruding portions on both sides in the axial direction in a state where each of the insertion portions is arranged between the protruding portions on both sides in the circumferential direction.

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