Stator and method for manufacturing a stator

Abstract

To suppress deviation of an insertion part of a coil inserted into a slot to a circumferential direction.SOLUTION: A stator 1 has 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 in a circumferential direction of the stator core 10, and expansion parts 21 and 22 expanding from an inner wall of both sides in the circumferential direction in the slots 15. The coil 30 has an insertion part 31 inserted into the slots 15. The insertion part 31 is placed in a state where the insertion part is in contact with at least one of the expansion parts 21 and 22 between the expansion parts 21 and 22 on both sides in the circumferential direction.SELECTED DRAWING: Figure 7

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses a molded motor including a stator. The stator includes a stator core in which a plurality of salient poles are arranged in the circumferential direction, and a plurality of coils wound around each salient pole of the stator core via an insulator. The winding of the coil is passed through a slot formed between the salient poles and wound around the salient pole.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a configuration having an insertion portion through which a coil is inserted into a slot as in Patent Document 1, it is desirable that the insertion portion does not displace circumferentially within the slot, and there is room for improvement in this regard.

[0005] One object of this disclosure is to provide a technique capable of suppressing the circumferential displacement of the insertion portion of the coil inserted into the slot.

Means for Solving the Problems

[0006] The stator of this disclosure includes an annular stator core and a coil attached to the stator core. The stator core has a plurality of slots arranged side by side in the circumferential direction of the stator core, and overhang portions protruding from inner walls on both circumferential sides of the slots. The coil has an insertion portion that is inserted into the slot, The insertion portion is positioned between the protruding portions on both sides in the circumferential direction, in contact with at least one of the protruding portions.

[0007] The method for manufacturing the stator described herein is: This includes a preparation step of preparing an annular stator core and coil segments, The stator core has a plurality of slots arranged in the circumferential direction of the stator core, and protruding portions extending from the inner walls on both sides in the circumferential direction of the slots, The coil segment has an insertion portion that is inserted into the slot, Furthermore, the process includes an insertion step of inserting the insertion portion into the slot from one axial side of the stator core so that the insertion portion passes between the protruding portions on both sides in the circumferential direction. [Effects of the Invention]

[0008] The technology disclosed herein can suppress circumferential displacement of the insertion portion of a coil inserted into a slot. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view of the stator core of the first embodiment. [Figure 2] Figure 2 is a cross-sectional view of the stator of the first embodiment, cut in the axial center. [Figure 3] Figure 3 is a plan view of the stator core of the first embodiment in a state where the protruding portion is not deflected, and is a partially enlarged view of the area around the slot. [Figure 4] Figure 4 is an explanatory diagram showing the state before the coil segment is inserted into the slot. [Figure 5] Figure 5 is an explanatory diagram showing the state in which the coil segment is inserted through the slot. [Figure 6] Figure 6 is an explanatory diagram showing how resin material is filled into the slot. [Figure 7] FIG. 7 is a cross-sectional view showing the structure within the slot. [Figure 8] FIG. 8 is a cross-sectional view obtained by cutting the stator of the second embodiment at the central axis direction. [Figure 9] FIG. 9 is a plan view of the stator core of the second embodiment in a state where the protruding portion is not bent and deformed, and is a partially enlarged view around the slot.

MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be listed and exemplified.

[0011] 〔1〕An annular stator core, and a coil attached to the stator core, and the stator core has a plurality of slots arranged side by side in the circumferential direction of the stator core, and protruding portions protruding from inner walls on both circumferential sides in the slots, the coil has an insertion portion inserted into the slot, the insertion portion is arranged in a state of contacting at least one of the protruding portions between the protruding portions on both circumferential sides, stator.

[0012] The displacement of the insertion portion to the protruding portion side is restricted by the protruding portion contacting the insertion portion itself. Therefore, in the above stator, the displacement of the insertion portion of the coil inserted into the slot in the circumferential direction can be suppressed.

[0013] 〔2〕The insertion portion is arranged in a state of contacting the protruding portions on both circumferential sides, the stator according to 〔1〕.

[0014] The displacement on both circumferential sides of the insertion portion is restricted by the protruding portions on both circumferential sides. Therefore, in the above stator, the displacement of the insertion portion to both circumferential sides can be suppressed.

[0015] [3] A plurality of the insertion portions are arranged within the slot in the radial direction of the stator core, The circumferentially extending portions on both sides are interposed between each of the insertion portions and the inner walls on both sides in the circumferential direction, and are continuous in the direction in which the multiple insertion portions are aligned. The stata described in [1] or [2].

[0016] The stator described above can continuously close the gaps between the inner wall of the slot and each insertion portion by the protruding portion in the direction in which the multiple insertion portions are aligned.

[0017] [4] A plurality of the insertion portions are arranged within the slot in the radial direction of the stator core, The circumferential protrusions on both sides have individual protrusions that correspond individually to each of the insertion portions. Each of the individual protrusions is positioned such that at least one of the individual protrusions on both sides in the circumferential direction is in contact with the insertion portion corresponding to itself. The stata described in [1] or [2].

[0018] The stator described above can individually suppress the circumferential displacement of each insertion portion by providing individual protrusions that correspond to each insertion portion.

[0019] [5] At least one of the circumferentially protruding portions that contact the insertion portion is pressed against the insertion portion and is deformed and curved, and is positioned so that the curved convex surface is in contact with the insertion portion. The stata described in [2].

[0020] The stator described above has its displacement on both sides in the circumferential direction more firmly restricted by the reaction force from at least one of the protruding portions. Therefore, the stator can more reliably suppress the displacement on both sides in the circumferential direction of the insertion portion.

[0021] [6] The insertion portion has a conductor portion and a covering portion that covers the outer circumference of the conductor portion, The convex surface is positioned in contact with the surface of the covering portion. The stata described in [5].

[0022] In a configuration where the insertion portion has a covering portion, there is a concern that the covering portion may be damaged due to contact between the protruding portion and the covering portion. In the above-mentioned stator, the convex surface of the protruding portion is positioned in contact with the surface of the covering portion, so that damage to the covering portion due to contact between the protruding portion and the covering portion can be suppressed.

[0023] [7] The stator core has an annular yoke portion and a plurality of teeth portions arranged in an annular shape along the yoke portion, Each of the aforementioned slots is formed by being divided by the yoke portion and two adjacent tooth portions. The yoke portion and the plurality of teeth portions are integrally formed by stacking a plurality of electromagnetic steel sheets in the axial direction of the stator core. The protruding portion is integrally formed with the teeth portion by the electromagnetic steel sheet. The status described in any of [1] through [6].

[0024] In the above-mentioned stator core, the protruding portion is formed integrally with the teeth portion by electromagnetic steel sheets that constitute the yoke portion and the teeth portion, thus allowing the protruding portion to be formed in a way that minimizes the increase in the number of parts.

[0025] [8] The protruding portion is provided on both sides of the slot in the axial direction of the stator core, The insertion portion is positioned so as to be in contact with at least one of the circumferential protrusions on both sides of the slot in the axial direction. The status listed in any of [1] through [7].

[0026] The insertion portion is restricted from displacement toward the protruding portion on both axial sides within the slot by the protruding portion that contacts it. Therefore, the stator can suppress circumferential displacement of the insertion portion on both axial sides within the slot.

[0027] [9] Furthermore, the slot is filled with insulating resin, The insulating resin has a continuous filling portion that is continuously filled between the axially protruding portions on both sides and between the circumferentially facing inner walls and the insertion portion. The status described in [8].

[0028] In the above-mentioned stator, since there is no insulating paper between the inner wall of the slot and the insertion part in the continuous filling section, heat from the insertion part is easily transferred to the stator core via the insulating resin, and heat from the coil is easily released.

[0029]

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

[0030] According to the above-described method for manufacturing a stator, when the insertion portion is inserted into the slot, the displacement of the insertion portion to both sides in the circumferential direction is limited by the protruding portions on both sides in the circumferential direction. Furthermore, even when the insertion portion is positioned within the slot, the displacement of the insertion portion to both sides in the circumferential direction is limited by the protruding portions on both sides in the circumferential direction. In other words, according to the above-described method for manufacturing a stator, it is possible to suppress the circumferential displacement of the insertion portion of the coil segment constituting the coil.

[0031]

[11] The protruding portion is arranged on both sides within the slot in the axial direction and is capable of bending and deforming with the portion supported by the inner wall as a fulcrum, The distance between the protruding portions on both sides in the circumferential direction when there is no bending deformation is smaller than the width of the insertion portion. In the insertion step, the insertion portion is inserted into the slot from one side in the axial direction so that the insertion portion passes between the protruding portions on both sides in the circumferential direction on both sides in the axial direction within the slot. Furthermore, the process includes a filling step of filling the space between the axially positioned protruding portions on both sides of the slot with resin material, while the insertion portion is positioned between the circumferentially positioned protruding portions on both sides of the slot. A method for manufacturing the stator described in

[10] .

[0032] According to the above stator manufacturing method, the resin material can be filled into the slots while suppressing leakage of the resin material by the protruding portions on both sides of the axial direction.

[0033]

[12] A plurality of the insertion portions are arranged within the slot in the radial direction of the stator core, The circumferentially protruding portions on both sides are interposed between each of the insertion portions and the inner wall, and are continuous in the direction in which the multiple insertion portions are aligned. In the filling step, the resin material is filled between the protruding portions on both sides of the axial direction, with each of the insertion portions positioned between the protruding portions on both sides of the circumferential direction. A method for manufacturing the stator described in

[11] .

[0034] According to the above-described method for manufacturing the stator, the gap between each insertion portion and the inner wall can be continuously covered by the protruding portions on both axial sides in the direction in which the multiple insertion portions are aligned, while the resin material can be filled into the slots.

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

[0036] As shown in Figure 1, the stator core 10 is annular, more specifically, circular. Hereafter, the radial direction of the stator core 10 will be referred to as the radial direction, the axial direction of the stator core 10 will be referred to as the axial direction, and the circumferential direction of the stator core 10 will be referred to as the circumferential direction. Note that in Figure 1, the protruding portions 21 and 22 (see Figure 7) are omitted.

[0037] As shown in Figures 1 and 2, the stator core 10 has a yoke portion 11 and a plurality of teeth portions 12. The yoke portion 11 is annular, more specifically, circular. The plurality of teeth portions 12 are arranged in an annular pattern along the inner circumferential surface of the yoke portion 11. Each tooth portion 12 is spaced apart from each other in the circumferential direction. Each tooth portion 12 protrudes radially inward from the inner circumferential portion of the yoke portion 11. Each tooth portion 12 has a wall-like structure along the radial and axial directions. Each tooth portion 12 has a tooth body 13 that is wall-like along the radial and axial directions, and tooth protrusions 14 that extend circumferentially from the tip of the tooth body 13 (in other words, the radially inward end) on both sides. The yoke portion 11 and the multiple tooth portions 12 are integrally formed by laminating multiple electrical steel sheets (for example, silicon steel sheets) in the axial direction of the stator core 10.

[0038] As shown in Figure 1, the stator core 10 has a plurality of slots 15. The plurality of slots 15 are arranged in a circumferential direction and form an annular shape. The slots 15 penetrate the stator core 10 in the axial direction. As shown in Figures 2 and 7, the slots 15 have a first opening 16, a second opening 17, and a third opening 18. The first opening 16 is formed on one axial side of the stator core 10. The second opening 17 is formed on the other axial side of the stator core 10. The third opening 18 is formed on the radially inner side of the stator core 10. The third opening 18 is continuous with the first opening 16 and the second opening 17. As shown in Figure 2, each slot 15 is formed by being divided into a yoke portion 11 and two adjacent tooth portions 12.

[0039] As shown in Figures 2 and 7, the stator core 10 has overhangs 21 and 22 that extend from the inner walls on both sides in the circumferential direction of the slot 15. The overhangs 21 and 22 are cantilevered to the inner wall of the slot 15 and can bend and deform with the portion supported by the inner wall as a fulcrum. The overhangs 21 and 22 are provided on both sides in the axial direction within the slot 15. The overhangs 21 and 22 are provided within each of the slots 15. The overhangs 21 and 22 are integrally formed with the teeth portion 12 by electromagnetic steel sheets that form the teeth portion 12. With this configuration, the stator core 10 can form the overhangs 21 and 22 in a way that suppresses an increase in the number of parts.

[0040] The coil 30 is mounted on the stator core 10. The coil 30 is wound around the stator core 10 (more specifically, the teeth portion 12). The coil 30 may be a distributed winding or a concentrated winding. If the coil 30 is a distributed winding, it may be a wave winding, a concentric winding, or a lap winding. In this embodiment, the coil 30 will be described as a wave winding. The coil 30 is wound around the teeth portion 12 through the slot 15. The coil 30 is constructed using a coated wire in which the outer circumference of the core wire is covered with a coating. In this embodiment, the coil 30 is a flat rectangular wire. However, the coil 30 does not have to be a flat rectangular wire; for example, it may be a round wire. As shown in Figure 2, the cross-section of the coil 30, when cut in a direction perpendicular to the length direction of the coil 30, is rectangular.

[0041] The coil 30 has an insertion portion 31 that is inserted into the slot 15. The insertion portion 31 is made of insulated wire. The insertion portion 31 is inserted axially into the slot 15. The insertion portion 31 is straight. One end of the insertion portion 31 protrudes in one axial direction from one end of the slot 15 (i.e., the first opening 16). The other end of the insertion portion 31 protrudes in the other axial direction from the other end of the slot 15 (i.e., the second opening 17). The insertion portion 31 is made of flat rectangular wire. As shown in Figure 2, the cross-section of the insertion portion 31, when cut in a direction perpendicular to the length direction (axial direction) of the insertion portion 31, is rectangular. The coil 30 is made of insulated wire in which the outer circumference of the core wire is covered with insulation. The insertion portion 31 has a conductor portion 32 and an insulation portion 33 that covers the outer circumference of the conductor portion 32.

[0042] The conductor portion 32 is electrically conductive. The conductor portion 32 is constructed using the core wire of an insulated wire. As shown in Figure 7, the conductor portion 32 has a linear shape. The conductor portion 32 extends in the axial direction. As shown in Figure 2, the cross-section of the conductor portion 32, when cut in a direction perpendicular to the length direction of the conductor portion 32, is rectangular.

[0043] The covering portion 33 has insulating properties. The covering portion 33 is constructed using the coating of an insulated wire. The material of the covering portion 33 is not particularly limited. In this embodiment, the covering portion 33 is a low dielectric constant enamel. The covering portion 33 may be mainly composed of thermosetting resins such as polyvinyl formal, thermosetting polyurethane, thermosetting acrylic, epoxy, thermosetting polyester, thermosetting polyesterimide, aromatic polyamide, thermosetting polyamideimide, and thermosetting polyimide. Alternatively, the covering portion may be mainly composed of thermoplastic resins such as polyetherimide, polyphenylene ether, polyethersulfone, polyphenylene sulfide, polyetheretherketone, and thermoplastic polyimide. Here, "main component" refers to the component with the highest content, for example, a component that is contained in 50% by mass or more.

[0044] The insulating resin 40 is filled into the slot 15, as shown in the slot 15B in Figure 2. The insulating resin 40 has a continuous filling section 41 that is continuously filled between the inner wall of the slot 15 and the insertion section 31 in the axial center of the stator core 10. The continuous filling section 41 is continuously filled between the axially protruding sections 21 and 22 on both sides of the slot 15. With this configuration, since there is no insulating paper interposed between the inner wall of the slot 15 and the insertion section 31 in the continuous filling section 41, heat from the insertion section 31 is easily transferred to the stator core 10 via the insulating resin 40, and heat from the coil 30 is easily released.

[0045] As shown in Figure 7, the aforementioned insertion portion 31 is positioned between the circumferential protrusions 21 and 22. The insertion portion 31 is positioned in contact with both the circumferential protrusions 21 and 22. With this configuration, the displacement of the insertion portion 31 in both circumferential directions is restricted by the circumferential protrusions 21 and 22. Therefore, the stator 1 can suppress the displacement of the insertion portion 31 in both circumferential directions.

[0046] Furthermore, as shown in Figure 7, the insertion portion 31 is positioned such that the circumferential protrusions 21 and 22 on both sides of the axial direction are in contact with each other. With this configuration, the insertion portion 31 is restricted from being displaced toward the protrusions 21 and 22 on both sides of the axial direction within the slot 15 by the protrusions 21 and 22 that are in contact with it. Therefore, the stator 1 can suppress the circumferential displacement of the insertion portion 31 on both sides of the axial direction within the slot 15.

[0047] As shown in Figure 2, multiple (four in this embodiment) insertion portions 31 are arranged radially within the slot 15. Note that in Figure 2, the insulating resin 40 is omitted in slot 15A, while slot 15B is shown filled with the insulating resin 40. The circumferential protrusions 21 and 22 are interposed between each insertion portion 31 and the inner walls on both sides of the slot 15 in the circumferential direction, and are continuous in the direction in which the multiple insertion portions 31 are aligned. With this configuration, the stator 1 can continuously close the gaps between the inner walls on both sides of the slot 15 in the circumferential direction and each insertion portion 31 using the protrusions 21 and 22 in the direction in which the multiple insertion portions are aligned.

[0048] The radial length of the protruding portions 21 and 22 is greater than the value obtained by multiplying the radial length of the insertion portion 31 (width of the insertion portion 31) by the number of insertion portions 31 arranged radially within the slot 15. The radially inner ends of the protruding portions 21 and 22 are positioned radially inward from the radially innermost insertion portion 31. The radially outer ends of the protruding portions 21 and 22 are positioned radially outward from the radially outermost insertion portion 31.

[0049] As shown in Figure 7, the circumferential protrusions 21 and 22 on both sides that contact the insertion portion 31 are both pressed against the insertion portion 31, causing them to bend and deform. The curved convex surfaces 21A and 22A of the protrusions 21 and 22 are positioned in contact with the insertion portion 31. The curved convex surfaces 21A and 22A of the protrusions 21 and 22 are positioned in contact with the insertion portion 31 on both sides in the axial direction. With this configuration, the stator 1's displacement on both sides in the circumferential direction is more firmly restricted by the reaction forces from the circumferential protrusions 21 and 22 on both sides. Therefore, the stator 1 can more reliably suppress the displacement of the insertion portion 31 on both sides in the circumferential direction.

[0050] As shown in Figures 2 and 7, the convex surfaces 21A and 22A of the protruding portions 21 and 22 are positioned in contact with the surface of the covering portion 33. In a configuration 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 protruding portions 21 and 22. In the stator 1, since the convex surfaces 21A and 22A of the protruding portions 21 and 22 are positioned in contact with the surface of the covering portion 33, damage to the covering portion 33 due to contact between the protruding portions 21 and 22 can be suppressed.

[0051] In the example shown in Figure 7, the entire axial protrusions 21 and 22 on one side are located within the slot 15, while the axial protrusions 21 and 22 on the other side extend outside the slot 15. However, the entire axial protrusions 21 and 22 on both sides may be located within the slot 15, or the axial protrusions 21 and 22 on both sides may extend outside the slot 15.

[0052] 2. Method for manufacturing stator 1 The method for manufacturing the stator 1 includes a preparation step, an insertion step, a filling step, a bending step, and a welding step.

[0053] In the preparation step, the stator core 10 and coil segment 50 described above are prepared. As shown in Figure 3, the protruding portions 21 and 22 of the stator core 10 are rectangular in shape when not deflected. The distance GA between the protruding portions 21 and 22 on both sides in the circumferential direction when not deflected 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 the direction perpendicular to the axial direction and perpendicular to the direction in which the multiple insertion portions 31 are aligned) is smaller than the distance GB between the inner walls on both sides in the circumferential direction of the slot 15, and larger than the distance GA between the protruding portions 21 and 22 on both sides in the circumferential direction when not deflected. The coil segment 50 is, for example, U-shaped and has two insertion portions 31.

[0054] In the insertion process, as shown in Figures 4 and 5, the insertion portion 31 is inserted into the slot 15 from one axial side of the stator core 10 so that it passes between the protruding portions 21 and 22 on both sides in the circumferential direction. With this method, when the insertion portion 31 is inserted into the slot 15, the displacement of the insertion portion 31 to both sides in the circumferential direction is limited by the protruding portions 21 and 22 on both sides. Furthermore, even when the insertion portion 31 is positioned in the slot 15, the displacement of the insertion portion 31 to both sides in the circumferential direction is limited by the protruding portions 21 and 22 on both sides in the circumferential direction. In other words, this method makes it possible to suppress the circumferential displacement of the insertion portion 31 of the coil segment 50 that constitutes the coil 30.

[0055] In the insertion process, as the insertion portion 31 is inserted into the slot 15, the insertion portion 31 causes the circumferentially protruding portions 21 and 22 on both sides to bend and deform, while the insertion portion 31 is inserted between the protruding portions 21 and 22. With this method, the insertion portion 31 is moved towards the circumferential center of the slot 15 by the circumferentially protruding portions 21 and 22 on both sides. Therefore, it is possible to prevent the covering portion 33 of the insertion portion 31 from contacting and damaging the open end of the slot 15.

[0056] In the insertion process, the insertion portion 31 is inserted into the slot 15 from one axial side so that it passes between the circumferential protrusions 21 and 22 on both axial sides of the slot 15. This closes the gap between the inner walls on both circumferential sides of the slot 15 and the insertion portion 31 on both axial sides of the slot 15.

[0057] In the insertion process, two insertion portions 31 of the coil segment 50 are inserted into separate slots 15. Four insertion portions 31 are inserted into each slot 15.

[0058] In the filling process, as shown in Figure 6, the resin material 61 is filled between the axially positioned protruding portions 21 and 22 on both sides of the slot 15, with the insertion portions 31 positioned between the circumferentially positioned protruding portions 21 and 22 on both sides of the slot 15. This method allows the resin material 61 to be filled into the slot 15 while preventing leakage of the resin material 61 by the axially positioned protruding portions 21 and 22. The resin material 61 hardens to become an insulating resin 40. Furthermore, the circumferentially positioned protruding portions 21 and 22 are interposed between each insertion portion 31 and the inner walls on both sides of the slot 15 in the circumferential direction, and are continuous in the direction in which the multiple insertion portions 31 are aligned. Therefore, the gap between each insertion portion 31 and the inner walls on both sides of the circumferential direction can be continuously covered by the axially positioned protruding portions 21 and 22 in the direction in which the multiple insertion portions 31 are aligned, while the resin material 61 is filled into the slot 15.

[0059] In the filling process, a filling device 60 that discharges the resin material 61 is positioned in the inner space of the annular stator core 10. The filling device 60 covers the radially inner opening (third opening 18) of the slot 15 with a cover 63, except for the resin material 61 injection port 62. The resin material 61 injection port 62 is positioned in the axial direction between the axially protruding portions 21 and 22 on both sides. The filling device 60 fills the space between the axially protruding portions 21 and 22 by filling the resin material 61 from the injection port 62. The filling of the resin material 61 may be done by intermittently rotating the filling device 60 to sequentially fill each slot 15, or by filling all slots 15 at once.

[0060] In the bending process, the portion of the coil segment 50 that protrudes from the other end of the slot 15 is bent. In the welding process, the bent portions of the coil segments 50 that have been inserted into separate slots 15 are welded together. Through these processes, the stator 1 is completed as shown in Figure 7.

[0061] <Second Embodiment> In the second embodiment, an example will be described in which the protruding portion has individual protruding portions provided separately to correspond to each insertion portion. In the description of the second embodiment, the same reference numerals are used for the same components as in the first embodiment, and detailed explanations will be omitted.

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

[0063] Within the slot 15, multiple insertion portions 31 are arranged radially along the stator core 210. The circumferential protrusions 221 and 222 have individual protrusions 223 and 224 that are provided to correspond individually to each insertion portion 31. The individual protrusions 223 and 224 on both sides in the circumferential direction are arranged in contact with the insertion portion 31 corresponding to themselves. With this configuration, the stator 201 can individually prevent each insertion portion 31 from being displaced on both sides in the circumferential direction by the individual protrusions 223 and 224 provided to correspond individually to each insertion portion 31.

[0064] The method for manufacturing the stator 201 is the same as the method for manufacturing the stator 1 in the first embodiment, but the following differences arise due to differences in the configuration.

[0065] Each individual protruding portion 223, 224 is positioned between its corresponding insertion portion 31 and the inner walls on both sides in the circumferential direction within the slot 15, and can independently flex and deform with the portion supported by the inner wall as a fulcrum. As shown in Figure 9, when the individual protruding portions 223, 224 are not flexed and deformed, they have a radially elongated rectangular shape. When the individual protruding portions 223, 224 are not flexed and deformed, the distance GC between the individual protruding portions 223, 224 on both sides in the circumferential direction is smaller than the width of the insertion portion 31. In other words, the width of the insertion portion 31 (more specifically, the width of the insertion portion 31 in the direction perpendicular to the axial direction and perpendicular to the direction in which the multiple insertion portions 31 are aligned) is smaller than the distance GB between the inner walls on both sides in the circumferential direction of the slot 15, and larger than the distance GC between the individual protruding portions 223, 224 on both sides in the circumferential direction when they are not flexed and deformed.

[0066] In the insertion process, when the insertion portion 31 is inserted into the slot 15, the insertion portion 31 causes the individual protruding portions 223 and 224 corresponding to the insertion portion 31 to bend and deform, while the insertion portion 31 is inserted between the individual protruding portions 223 and 224. With this method, each individual protruding portion 223 and 224 is displaced individually to match the position of the insertion portion 31 corresponding to it, so that gaps are less likely to occur between the protruding portions 221 and 222 and the insertion portion 31 in the circumferential direction.

[0067] <Other Embodiments> This disclosure is not limited to the embodiments described above and in the drawings. For example, any combination of the features of the embodiments described above or below is possible as long as it does not contradict each other. Furthermore, any feature of the embodiments described above or below may be omitted unless explicitly stated as essential. In addition, the embodiments described above may be modified as follows.

[0068] In the embodiments described above, the protruding portion was formed integrally with the teeth portion using the same material; however, the protruding portion may also be formed from a separate material from the teeth portion.

[0069] In the embodiments described above, the insertion portion was configured to contact both of the protruding portions on both sides in the circumferential direction, but it may also be configured to contact only one side.

[0070] In the embodiments described above, both circumferentially protruding portions were configured to bend and curve due to flexural deformation. However, it is also possible for only one of the circumferentially protruding portions to bend and curve due to flexural deformation, or for neither portion to be curved.

[0071] In the above embodiments, the convex surface of the protruding portion was in contact with the insertion portion, but the protruding end of the protruding portion may also be in contact with the insertion portion.

[0072] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is not limited to the embodiments disclosed herein, and is intended to include all modifications within the scope set forth in the claims or equivalents thereof. [Explanation of Symbols]

[0073] 1…Status 10… Stator core 11… York 12... Teeth Department 13... Teeth body 14...Teeth protrusion 15... Slot 15A... Slot 15B... Slot 16…First opening 17…Second opening 18…Third opening 21...Protrusion 21A…Convex surface 22...Protrusion 22A…Convex surface 30... Coil 31... Insertion part 32...Conductor part 33... Covering part 40…Insulating resin 41...Continuous filling section 44... Covering part 50... Coil segment 60...Filling device 61… Resin materials 62…Inlet 63...cover 201…Status 210... Stator core 221...Protrusion 222...Protrusion 223…Individual overhang 224…Individual overhang

Claims

1. A ring-shaped stator core, The stator core is fitted with a coil, The stator core has a plurality of slots arranged in the circumferential direction of the stator core, and protruding portions extending from the inner walls on both sides in the circumferential direction of the slots, The coil has an insertion portion that is inserted into the slot, The insertion portion is positioned between the protruding portions on both sides in the circumferential direction, in contact with at least one of the protruding portions. Within the aforementioned slot, a plurality of the aforementioned insertion portions are arranged in the radial direction of the stator core. The circumferential protrusions on both sides have individual protrusions that correspond individually to each of the insertion portions. Each of the individual protrusions is positioned such that at least one of the individual protrusions on both sides in the circumferential direction is in contact with the insertion portion corresponding to itself. stata.

2. The insertion portion is positioned in contact with the protruding portions on both sides in the circumferential direction. The stator according to claim 1.

3. A ring-shaped stator core, The stator core is fitted with a coil, The stator core has a plurality of slots arranged in the circumferential direction of the stator core, and protruding portions extending from the inner walls on both sides in the circumferential direction of the slots, The coil has an insertion portion that is inserted into the slot, The insertion portion is positioned between the protruding portions on both sides in the circumferential direction, in contact with at least one of the protruding portions. The insertion portion is positioned in contact with the protruding portions on both sides in the circumferential direction. At least one of the circumferentially protruding portions that contact the insertion portion is pressed against the insertion portion and deformed, curving, and is positioned so that the curved convex surface is in contact with the insertion portion. stata.

4. Within the aforementioned slot, a plurality of the aforementioned insertion portions are arranged in the radial direction of the stator core. The circumferential protrusions on both sides have individual protrusions that correspond individually to each of the insertion portions. Each of the individual protrusions is positioned such that at least one of the individual protrusions on both sides in the circumferential direction is in contact with the insertion portion corresponding to itself. The stator according to claim 3.

5. The insertion portion has a conductor portion and a covering portion that covers the outer circumference of the conductor portion. The convex surface is positioned in contact with the surface of the covering portion. The stator according to claim 3 or claim 4.

6. The stator core has an annular yoke portion and a plurality of teeth portions arranged annularly along the yoke portion, Each of the aforementioned slots is formed by being divided by the yoke portion and two adjacent tooth portions. The yoke portion and the plurality of teeth portions are integrally formed by stacking a plurality of electromagnetic steel sheets in the axial direction of the stator core. The protruding portion is integrally formed with the teeth portion by the electromagnetic steel sheet. The stator according to any one of claims 1 to 4.

7. The aforementioned protruding portions are provided on both sides within the slot in the axial direction of the stator core. The insertion portion is positioned so as to be in contact with at least one of the circumferential protrusions on both sides of the slot in the axial direction. The stator according to any one of claims 1 to 4.

8. Furthermore, the slot is filled with insulating resin, The insulating resin has a continuous filling portion that is continuously filled between the axially protruding portions on both sides and between the circumferentially facing inner walls and the insertion portion. The stator according to claim 7.

9. This includes a preparation step of preparing an annular stator core and coil segments, The stator core has a plurality of slots arranged in the circumferential direction of the stator core, and protruding portions extending from the inner walls on both sides in the circumferential direction of the slots, The coil segment has an insertion portion that is inserted into the slot, Furthermore, the process includes an insertion step of inserting the insertion portion into the slot from one axial side of the stator core so that the insertion portion passes between the protruding portions on both sides in the circumferential direction, The aforementioned protruding portions are arranged on both sides within the slot in the axial direction and are capable of bending and deforming with the portion supported by the inner wall as a fulcrum. The distance between the protruding portions on both sides in the circumferential direction when there is no bending deformation is smaller than the width of the insertion portion. In the insertion step, the insertion portion is inserted into the slot from one side in the axial direction so that the insertion portion passes between the protruding portions on both sides in the circumferential direction on both sides in the axial direction within the slot. Furthermore, the process includes a filling step of filling the space between the axially positioned protruding portions on both sides of the slot with resin material, while the insertion portion is positioned between the circumferentially positioned protruding portions on both sides of the slot. A method for manufacturing a stator.

10. Within the aforementioned slot, a plurality of the aforementioned insertion portions are arranged in the radial direction of the stator core. The circumferentially protruding portions on both sides are interposed between each of the insertion portions and the inner wall, and are continuous in the direction in which the multiple insertion portions are aligned. In the filling step, the resin material is filled between the protruding portions on both sides of the axial direction, with each of the insertion portions positioned between the protruding portions on both sides of the circumferential direction. A method for manufacturing a stator according to claim 9.

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