Stator manufacturing method and stator

Abstract

This stator manufacturing method is a method for manufacturing a stator (1) comprising an annular stator core (10), the stator core (10) having a plurality of slots (15) that penetrate the stator core (10) in the axial direction and are formed side by side in the circumferential direction around the axis of the stator core (10). The stator manufacturing method includes: a placement step of placing an insulation paper (40) having an opening (43) corresponding to each slot (15) at one end of the stator core (10); and an insertion step of inserting a coil segment (20A) from the one end side into the slot (15) after the placement step. In the placement step, when viewed from the axial direction, the insulation paper (40) is placed such that the edge of the opening (43) protrudes further to the inside of each slot (15) than a first opening edge (16) of the slot (15). In the insertion step, the coil segment (20A) is inserted into the slot (15) in a state in which the edge of the opening (43) protrudes further to the inside of the slot (15) than the first opening edge (16).

Description

Stator manufacturing method and stator

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

[0002] Patent Documents 1 and 2 disclose the configuration of a motor having a stator core around which a coil is wound.

[0003] Relisted WO2019 / 220956 JP 2010-57273 A

[0004] When a stator core is formed by stamping a metal plate, burrs are easily formed. For this reason, it is necessary to wind the coil around the stator core while preventing the coil from coming into contact with the burrs. Furthermore, when a coil segment is attached to the stator core, there is a concern that the burrs on the stator core may come into contact with the coil segment and damage the coating disposed on the outer surface of the coil segment.

[0005] Therefore, an object of the present disclosure is to provide a technique for preventing contact between the stator core and the coil segments with a simple configuration.

[0006] A first disclosed method for manufacturing a stator includes a ring-shaped stator core having a plurality of slots formed in a circumferential direction around the axis of the stator core, the stator core penetrating the stator core in the axial direction, the method including: an arrangement step of arranging insulating paper having openings corresponding to each of the slots at one end of the axial direction of the stator core; and an insertion step of inserting coil segments into the slots from the one end side in the axial direction after performing the arrangement step, wherein the arrangement step arranges the insulating paper so that, when viewed from the axial direction, the edge of the opening of at least a part of the slot protrudes further inward than the opening edge, and the insertion step inserts the coil segments into the slots with the edge of the opening protruding further inward than the opening edge.

[0007] The stator of the second disclosure comprises an annular stator core, insulating paper, and a coil, wherein the stator core has a plurality of slots that penetrate the stator core in the axial direction and are arranged in a circumferential direction around the axis of the stator core, the insulating paper has openings corresponding to each of the slots and is arranged at one end of the axial direction of the stator core, a portion of the coil is accommodated in the slot, and the edges of the openings contact both circumferential ends of the coil that protrude axially from the one end of the stator core.

[0008] According to the present disclosure, it is possible to prevent contact between the stator core and the coil segments with a simple configuration.

[0009] FIG. 1 is a perspective view showing a stator of the first embodiment cut in the axial direction. FIG. 2 is a partially enlarged perspective view showing a stator core. FIG. 3 is a partially enlarged plan view of the stator core with insulating paper attached, as viewed from the axial direction. FIG. 4 is a perspective view showing a positioning component. FIG. 5 is a perspective view showing a coil segment. FIG. 6 is a plan view of the stator, as viewed from the axial direction. FIG. 7 is a cross-sectional view taken along the line A-A in FIG. 6. FIG. 8 is a partially enlarged plan view showing insulating paper of another embodiment attached to a stator core. FIG. 9 is a partially enlarged plan view showing insulating paper of yet another embodiment attached to a stator core. FIG. 10 is a partially enlarged plan view showing insulating paper with holes as openings attached to a stator core.

[0010] [Description of Embodiments of the Present Disclosure] In the following, embodiments of the present disclosure are listed and illustrated.

[0011] [1] A method for manufacturing a stator comprising an annular stator core having a plurality of slots formed in a circumferential direction around the axis of the stator core, the method comprising: an arrangement step of arranging insulating paper having openings corresponding to each of the slots at one end of the axial direction of the stator core; and an insertion step of inserting coil segments into the slots from the one end side in the axial direction after performing the arrangement step, wherein the arrangement step arranges the insulating paper so that, when viewed from the axial direction, the edge of the opening of at least a portion of the slot protrudes further inward than the opening edge, and the insertion step inserts the coil segments into the slots with the edge of the opening protruding further inward than the opening edge.

[0012] The stator manufacturing method [1] has an opening edge that protrudes further inward into the slot than the opening edge in at least a portion of the opening edge, thereby preventing the coil segment from coming into contact with the opening edge when the coil segment is inserted into the slot.

[0013] [2] A method for manufacturing a stator as described in [1], wherein the arrangement process arranges the insulating paper so that, when viewed from the axial direction, the edge of the opening protrudes further inward than both circumferential ends of the opening edge into the slot.

[0014] The stator manufacturing method [2] can prevent the coil segment from coming into contact with both circumferential ends of the slot opening edge even if the coil segment is shifted circumferentially during the insertion process due to the edge of the opening in the insulating paper.

[0015] [3] A method for manufacturing a stator described in [1] or [2], wherein the arrangement process arranges the insulating paper so that the edge of the opening protrudes more inward than the outer end of the opening edge in the radial direction of the stator core.

[0016] The stator manufacturing method [3] can prevent the coil segment from contacting the outer end of the slot opening edge even if the coil segment is shifted radially outward during the insertion process due to the edge of the opening in the insulating paper.

[0017] [4] A method for manufacturing a stator described in [2] or [3], wherein the circumferential opening dimension of the opening is smaller than the circumferential width dimension of the coil segment, and after performing the insertion process, the method further includes a filling process of filling insulating resin into the space between the inner surface of the slot and the outer surface of the coil segment from the axial center within the slot.

[0018] The stator manufacturing method [4] is expected to have the effect of suppressing leakage of insulating resin from between the insulating paper and the coil segments when the filling step is carried out.

[0019] [5] A stator comprising an annular stator core, insulating paper, and a coil, wherein the stator core has a plurality of slots that penetrate the stator core in the axial direction and are arranged in a circumferential direction around the axis of the stator core, the insulating paper has openings corresponding to each of the slots and is arranged at one end of the axial direction of the stator core, a portion of the coil is housed in the slot, and the edges of the openings contact both circumferential ends of the coil that protrude axially from the one end of the stator core.

[0020] The stator [5] is expected to have the effect of preventing the insertion part from contacting the edge of the slot when inserting a coil into the slot with insulating paper placed at one end of the stator core. Also, when the slot accommodating the coil is filled with insulating resin, it is expected to have the effect of preventing the resin from leaking out from between the insulating paper and the coil.

[0021] First Embodiment [Configuration of Stator] A stator 1 according to the first embodiment is used as a component of a rotating electrical machine (specifically, a motor). As shown in Fig. 1, the stator 1 includes a stator core 10, insulating paper 40, a plurality of positioning components 60, a coil 20, and insulating resin 30 (see Figs. 6 and 7). Note that the insulating resin 30 is not shown in Fig. 1.

[0022] [Configuration of Stator Core] The stator core 10 may be, for example, a laminated steel plate manufactured by stacking multiple electromagnetic steel plates (e.g., silicon steel plates) in the plate thickness direction, or a powder magnetic core manufactured by press-molding insulatingly coated magnetic particles. The stator core 10 has an annular shape. FIG. 1 shows only one half of the stator core 10, which is circumferentially divided. In the following description, the radial direction of the stator core 10 is referred to as the radial direction, the axial direction of the stator core 10 is referred to as the axial direction, and the circumferential direction of the stator core 10 is referred to as the circumferential direction. As shown in FIG. 2 , the stator core 10 has a yoke portion 11, multiple teeth 12, and multiple slots 15. The yoke portion 11 is the outer circumferential portion of the stator core 10 and has an annular shape.

[0023] The multiple teeth 12 extend in the axial direction and are arranged in an annular pattern along the inner circumferential surface of the yoke portion 11. The teeth 12 are arranged at predetermined intervals in the circumferential direction. Each tooth 12 protrudes radially inward from the inner circumferential surface of the yoke portion 11. Each tooth 12 has a wall shape that extends in the radial and axial directions.

[0024] Each tooth portion 12 has a tooth main body 13 that extends radially and axially to form a wall, and a tooth extension portion 14 that extends circumferentially on both sides from the tip end (in other words, the radially inner end) of the tooth main body 13.

[0025] The multiple slots 15 are arranged in a ring shape inside the yoke portion 11. In other words, the multiple slots 15 are arranged in a line in the circumferential direction around the axis of the stator core 10. Each slot 15 penetrates the stator core 10 in the axial direction. Each slot 15 has opening edges: a first opening edge 16, a second opening edge 17, and a third opening edge 18. The first opening edge 16 is located on one axial end face of the stator core 10. The second opening edge 17 is located on the other axial end face of the stator core 10. The third opening edge 18 is located on the radially inner surface of the stator core 10 so as to extend in the axial direction. The third opening edge 18 is continuous with the first opening edge 16 and the second opening edge 17. Each slot 15 is arranged between two adjacent tooth portions 12. In other words, each slot 15 is defined by two adjacent tooth portions 12. In each slot 15 , both circumferential side surfaces are formed by the teeth 12 , and the radial outer surface is formed by the yoke 11 .

[0026] [Configuration of the insulating paper] The insulating paper 40 is formed, for example, by pressing insulating paper or synthetic resin molded into a film. The insulating paper 40 has an annular shape. Only a portion of the insulating paper 40 in the circumferential direction is shown in Fig. 3. As shown in Fig. 3, the insulating paper 40 has an annular portion 41, a plurality of protrusions 42, and a plurality of openings 43. The annular portion 41 is the outer portion of the insulating paper 40 in the circumferential direction and has an annular shape.

[0027] The multiple protrusions 42 are arranged in a ring shape along the inner circumferential edge of the annular portion 41. The protrusions 42 are arranged at predetermined intervals in the circumferential direction. Each protrusion 42 protrudes radially inward from the inner circumferential edge of the annular portion 41. Each protrusion 42 has a protrusion main body 44 and protruding portions 45 that protrude on both circumferential sides from the tip end of the protrusion main body 44 (in other words, the radially inner end).

[0028] The multiple openings 43 are arranged in a ring shape inside the annular portion 41. Each opening 43 is open radially inward. Each opening 43 is arranged between two adjacent protrusions 42. In other words, each opening 43 is defined by two adjacent protrusions 42. Both circumferential side edges of each opening 43 are defined by the protrusions 42, and the radial outer edge is defined by the annular portion 41. Each opening 43 corresponds to each slot 15 of the stator core 10.

[0029] The insulating paper 40 is coaxially arranged at one axial end of the stator core 10 and is attached to one end surface of the stator core 10 with an adhesive such as double-sided tape. The insulating paper 40 is arranged so that each opening 43 corresponds to and overlaps with each slot 15 of the stator core 10. When viewed from the axial direction, the edge of each opening 43 at the first opening edge 16 of each slot 15 protrudes inward of the slot 15. Specifically, the edge of the opening 43 at the circumferentially opposing edge and the radially outer edge of the first opening edge 16 protrudes inward of the slot 15. The width dimension of the opening 43 in the circumferential direction is smaller than the width dimension of the first opening edge 16 of each slot 15 in the circumferential direction.

[0030] [Configuration of Positioning Component] The positioning component 60 is made of insulating synthetic resin, ceramic, or the like. As shown in FIG. 4 , the positioning component 60 is cylindrical with both axial ends open. The positioning component 60 has a base 61 and an insertion tube 62. The base 61 has an annular base 63 and a protruding portion 64. The annular base 63 is cylindrical with both axial ends open. The protruding portion 64 protrudes from each of both circumferential sides (both left and right sides in FIG. 4 ) of the annular base 63 to the other axial side (the lower side in FIG. 4 ).

[0031] The insertion tube portion 62 protrudes in a rectangular tube shape from the base portion 61 on the side opposite to the protruding portion 64 (one axial side, the upper side in FIG. 4 ). The insertion tube portion 62 is a thinner tube than the base portion 61. The inner peripheral surface of the insertion tube portion 62 is flush with the inner peripheral surface of the annular base portion 63.

[0032] The positioning component 60 is attached by inserting an insertion tube portion 62 into the other end of the slot 15 through which an insertion portion 20B of a coil segment 20A (described later) is inserted (see FIG. 7).

[0033] [Coil Configuration] As shown in FIG. 1 , the coil 20 includes multiple coil segments 20A. As shown in FIG. 5 , each coil segment 20A is formed, for example, by bending a conductive metal prism into a U-shape. An insertion portion 20B extending in the axial direction is provided at each end of each coil segment 20A. For example, the insertion portion 20B of each coil segment 20A is inserted into the slot 15 of the stator core 10, to which insulating paper 40 is attached, in a linear state (dotted line in FIG. 5 ). The end of the insertion portion 20B protruding from the other end (lower end in FIG. 1 ) of the stator core 10 is bent into a predetermined shape in a bending process (solid line in FIG. 5 ). That is, a portion of the coil segment 20A (coil 20) is accommodated in the slot 15.

[0034] A coating is disposed on the outer surface of the coil segment 20A. In the coil segment 20A, the coating is disposed so as to cover the outer surface of the metal conductor through which current flows. The coating forms an insulating layer. The material of the coating is not particularly limited. In this embodiment, the coating is a low-dielectric-constant enamel. The coating may be primarily composed of a thermosetting resin, such as polyvinyl formal, thermosetting polyurethane, thermosetting acrylic, epoxy, thermosetting polyester, thermosetting polyesterimide, aromatic polyamide, thermosetting polyamideimide, or thermosetting polyimide. The coating may also be primarily composed of a thermoplastic resin, such as polyetherimide, polyphenylene ether, polyethersulfone, polyphenylene sulfide, polyetheretherketone, or thermoplastic polyimide. Here, the term "major component" refers to the component with the highest content, e.g., a component present at 50% by mass or more.

[0035] [Configuration of Insulating Resin] Synthetic resin is used for the insulating resin 30. The insulating resin 30 is filled into the slots 15 (see FIG. 7).

[0036] [Positional relationship between slots, insulating paper, positioning parts, coil segments, and insulating resin] In Figure 6, slot 15A (slot 15) does not show the insulating resin 30, slot 15B (slot 15) shows a state in which it is filled with insulating resin 30, and slot 15C (slot 15) shows a state in which it is filled with insulating resin 30 and insulating paper 40 is attached to the stator core 10.

[0037] 6, a plurality of (four in this embodiment) insertion portions 20B are arranged in one slot 15. The plurality of insertion portions 20B are arranged in a row along the radial direction in one slot 15.

[0038] 6, in the circumferential direction, the insertion tube portions 62 are positioned between the inner surface of the slot 15A and the outer surface of one insertion portion 20B on both sides of the insertion portion 20B. In the radial direction, the insertion portions 20B are positioned between the inner surface of the slot 15A and the outward outer surface of the outermost insertion portion 20B among the multiple insertion portions 20B arranged in a line along the radial direction, and the inner surface of the slot 15A.

[0039] As shown in slot 15B in Fig. 6, insulating resin 30 is filled to fill the gap between the inner surface of slot 15B and the outer surface of insertion portion 20B. Insulating resin 30 is continuously filled between the inner surface of slot 15B and the outer surface of insertion portion 20B in the axial center of stator core 10 (see Fig. 7).

[0040] As shown in slot 15C in Fig. 6, the circumferential opening dimension of opening 43 in insulating paper 40 is smaller than the circumferential width dimension of insertion portion 20B of coil segment 20A. Therefore, when insertion portion 20B is inserted into opening 43, opening 43 is expanded in the circumferential direction. At the same time, the edge of opening 43 protruding into slot 15 enters slot 15 as if being drawn into insertion portion 20B (see Fig. 7).

[0041] The insertion portion 20B inserted into the slot 15 is positioned by the insertion tube portion 62 and the edge of the opening 43 of the insulating paper 40 pulled into the slot 15 so as not to come into contact with the inner surface of the slot 15 (see Figure 7).

[0042] [Method of Manufacturing Stator] The method of manufacturing the stator 1 includes a placement step, an insertion step, a mounting step, a filling step, a bending step, and a welding step.

[0043] The arrangement process is a process of arranging insulating paper 40 having openings 43 corresponding to each slot 15 at one axial end of the stator core 10 (see FIG. 3 ). The insulating paper 40 is attached to one axial end surface of the stator core 10 so as to be coaxial with the stator core 10. At this time, as shown in FIG. 3 , the insulating paper 40 is arranged so that, when viewed from the axial direction, the edges of the openings 43 protrude further inward of the slots 15 than both circumferential ends of the first opening edge 16. At the same time, the insulating paper 40 is arranged so that, when viewed from the axial direction, the edges of the openings 43 protrude further inward of the slots 15 than the outer ends of the first opening edge 16 in the radial direction of the stator core 10.

[0044] The insertion process is a process of inserting the coil segment 20A into the slot 15 from one axial end side after the placement process (see FIG. 7 ). In the insertion process, the coil segment 20A is inserted into the slot 15 with the edge of the opening 43 protruding further into the slot 15 than the first opening edge 16 when viewed from the axial direction. In the insertion process, the coil segment 20A is inserted into the slot 15 with the insulating paper 40 fixed to one end surface of the stator core 10. The insertion portion 20B of the coil segment 20A is straight (dotted line in FIG. 5 ). After being inserted into the opening 43 of the insulating paper 40 from one axial end side, the coil segment 20A is inserted into the slot 15. At this time, the end of the opening 43 of the insulating paper 40 protruding into the slot 15 is drawn into the insertion portion 20B and bent to enter the slot 15 (see FIG. 7 ). This allows the first opening edge 16 to be covered with the insulating paper 40, preventing the outer surface of the insertion portion 20B from contacting the first opening edge 16 of the slot 15 and preventing damage to the covering that covers the outer surface of the insertion portion 20B. The tip of the insertion portion 20B protrudes from the other axial end of the stator core 10. The insertion portion 20B also protrudes from one axial end of the stator core 10.

[0045] In the attachment process, the positioning component 60 is inserted into the insertion portion 20B of the coil segment 20A inserted into the slot 15 in the insertion process, and then the positioning component 60 is attached to the other end side of the slot 15 (see FIG. 7 ). That is, in the attachment process, the positioning component 60 is attached to the coil segment 20A protruding from the second opening edge 17 on the other axial end side of the slot 15. In the attachment process, the insertion portion 20B of the coil segment 20A is inserted into the cylindrical insertion tube portion 62 of the positioning component 60.

[0046] In the attachment process, the positioning component 60 inserted into the insertion portion 20B is positioned so as to cover the second opening edge 17 on the other axial end side of the slot 15 (see FIG. 7). The insertion tube portion 62 of the positioning component 60 is inserted into the slot 15 from the protruding end side. The annular base portion 63 of the base portion 61 of the positioning component 60 is positioned so as to contact the other axial end face of the stator core 10. By performing the attachment process, the insertion tube portion 62 is positioned so as to be sandwiched between the inner surface of the slot 15 and the outer surface of the insertion portion 20B (see FIG. 7). This allows the insertion portion 20B to be positioned so that it does not contact the inner surface of the slot 15.

[0047] The filling process is a process in which, after the insertion process, insulating resin 30 is continuously filled from the axial center of the slot 15 into the space between the inner surface of the slot 15 and the outer surface of the coil segment 20A (insertion portion 20B) (see FIG. 7 ). Because the insulating resin 30 is continuously filled between the inner surface of the slot 15 and the coil segment 20A, heat from the coil segment 20A is easily dissipated through the insulating resin 30, thereby improving the heat dissipation performance of the coil segment 20A. When the insulating resin 30 is filled, the first opening edge 16 at one axial end of the slot 15 is blocked by insulating paper 40. The second opening edge 17 at the other axial end of the slot 15 is blocked by a positioning part 60. The third opening edge 18 on the radially inner side of the slot 15 is blocked by a separate member, except for a resin injection portion located at the axial center. With the first opening edge 16, the second opening edge 17, and the third opening edge 18 blocked in this manner, the insulating resin 30 is filled into the slot 15 from the third opening edge 18. With this configuration, the insulating paper 40 and the positioning component 60 can easily prevent the insulating resin 30 from leaking from both axial sides of the slot 15. The filling process is performed with the coil segment 20A positioned by the insulating paper 40 and the positioning component 60.

[0048] In the bending process, the tip end of the insertion portion 20B of each coil segment 20A (the portion protruding from the other end of the stator core 10) is bent in one or the other circumferential direction (see FIG. 7), thereby bending the insertion portion 20B of each coil segment 20A into the state shown by the solid line in FIG.

[0049] In the welding process, the end of the insertion portion 20B bent in the bending process is welded to another coil component (for example, the end of the insertion portion 20B of another coil segment 20A) to form the coil 20. Through these processes, the stator 1 is manufactured.

[0050] Next, the effects of this configuration are illustrated. The method for manufacturing a stator includes a ring-shaped stator core 10 having a plurality of slots 15 formed axially through the stator core 10 and aligned circumferentially around the axis of the stator core 10. The method for manufacturing a stator includes an arrangement step of arranging insulating paper 40 having openings 43 corresponding to the slots 15 at one axial end of the stator core 10, and an insertion step of inserting the insertion portions 20B of the coil segments 20A into the slots 15 from the one axial end after the arrangement step. In the arrangement step, the insulating paper 40 is arranged so that, when viewed from the axial direction, the edges of the openings 43 at the first opening edges 16 of the slots 15 protrude further inward than the first opening edges 16. In the insertion step, the coil segments 20A are inserted into the slots 15 with the edges of the openings 43 protruding further inward than the first opening edges 16.

[0051] According to this configuration, by protruding the edge of the opening 43 further inward into the slot 15 than the first opening edge 16 at the first opening edge 16, when the coil segment 20A is inserted into the slot 15, the edge of the opening 43 can be prevented from contacting the coil segment 20A with the first opening edge 16.

[0052] In the arrangement step, the insulating paper 40 is arranged so that, when viewed from the axial direction, the edges of the openings 43 protrude further inward into the slot 15 than both circumferential ends of the first opening edge 16. With this configuration, even if the coil segment 20A is shifted in the circumferential direction during the insertion step due to the edges of the openings 43 of the insulating paper 40, the coil segment 20A can be prevented from contacting both circumferential ends of the first opening edge 16 of the slot 15.

[0053] In the arrangement step, the insulating paper 40 is arranged so that the edge of the opening 43 protrudes further inward into the slot 15 than the outer end of the first opening edge 16 in the radial direction of the stator core 10. With this configuration, even if the coil segment 20A is shifted radially outward in the insertion step due to the edge of the opening 43 of the insulating paper 40, it is possible to prevent the coil segment 20A from contacting the outer end of the first opening edge 16 of the slot 15.

[0054] The circumferential opening dimension of the opening 43 in the insulating paper 40 is smaller than the circumferential width dimension of the insertion portion 20B of the coil segment 20A. After the insertion process is performed, the method further includes a filling process of filling the space between the inner surface of the slot 15 and the outer surface of the coil segment 20A with insulating resin 30 from the axial center of the slot 15. With this configuration, when the filling process is performed, it is expected that the insulating resin 30 will be prevented from leaking from the gap between the insulating paper 40 and the coil segment 20A.

[0055] The stator 1 includes an annular stator core 10, insulating paper 40, and a coil 20. The stator core 10 has a plurality of slots 15 formed in the axial direction, penetrating the stator core 10 and aligned in the circumferential direction around the axis of the stator core 10. The insulating paper 40 has openings 43 corresponding to each slot 15 and is disposed at one axial end of the stator core 10. An insertion portion 20B, which is a part of the coil 20, is housed in the slot 15. Edges of the openings 43 contact both circumferential ends of the insertion portion 20B of the coil 20, which protrudes axially from one end of the stator core 10.

[0056] With this configuration, when inserting the insertion portion 20B of the coil 20 into the slot 15 with the insulating paper 40 placed at one end of the stator core 10, it is expected that the insertion portion 20B will be prevented from contacting the edge of the slot 15. Furthermore, in the case of specifications in which the slot 15 accommodating the insertion portion 20B of the coil 20 is filled with insulating resin 30, it is also expected that the insulating resin 30 will be prevented from leaking out from between the insulating paper 40 and the insertion portion 20B of the coil 20.

[0057] Other Embodiments The present disclosure is not limited to the embodiments described above and illustrated in the drawings. For example, any combination of features of the above-described or following embodiments is possible within a range that does not contradict. Furthermore, any feature of the above-described embodiments may be omitted unless explicitly stated as essential.

[0058] Unlike the above-described embodiments, a configuration may be adopted in which arc-shaped insulating papers are attached to one end surface of a plurality of stator cores.

[0059] Unlike the above embodiment, the insertion process may be performed in a state where the insulating paper is pressed and fixed against one end face of the stator core using a jig or the like. The insulating paper may be pressed against the one end face of the stator core at, for example, the outer periphery or inner periphery of the insulating paper. Alternatively, the insulating paper may be attached to the stator core with an adhesive, and then the insulating paper may be pressed against the one end face of the stator core using a jig or the like.

[0060] Unlike the above embodiment, the insulating paper may be arranged so that, when viewed from the axial direction, the edge of the opening at a portion of the slot opening edge protrudes further inward than the opening edge. For example, as shown in FIG. 8 , the insulating paper may be configured such that, when viewed from the axial direction, the edge of the opening 143 protrudes further inward than both circumferential ends of the first opening edge 16 into the slot 15, and the edge of the opening 143 is positioned further outward than the outer end of the first opening edge 16 in the radial direction of the stator core 10. Also, as shown in FIG. 9 , the insulating paper may be configured such that, when viewed from the axial direction, the edge of the opening 243 is positioned further outward than both circumferential ends of the first opening edge 16 into the slot 15, and the edge of the opening 243 protrudes further inward than the outer end of the first opening edge 16 in the radial direction of the stator core 10. In other words, when viewed in the axial direction, it is sufficient that the edge of the opening protrudes further inward of the slot 15 than the first opening edge 16 in at least a portion of the first opening edge 16 of the slot 15 .

[0061] Unlike the above embodiment, the opening 343 may be formed as a rectangular hole, as in the insulating paper 340 shown in Fig. 10. In this case, by forming notches 346 at the four corners of the opening 343, it is possible to prevent the insulating paper 340 from tearing at the four corners of the opening 343 even when the insertion part is inserted and the opening 343 is pushed open.

[0062] Unlike the above embodiment, the width of the opening in the insulating paper in the circumferential direction may be the same as the outer dimension of the insertion portion, that is, the edges of the opening in the insulating paper may be in contact with both circumferential ends of the coil segment that protrudes axially from one end of the stator core.

[0063] Unlike the above embodiment, the stator core is not limited to a circular ring shape, but may be a polygonal ring shape.

[0064] It should be noted that the embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed herein, and is intended to include all modifications within the scope indicated by the claims or within the scope equivalent to the claims.

[0065] 1: Stator 10: Stator core 11: Yoke portion 12: Teeth portion 13: Teeth body 14: Teeth protrusion portion 15, 15A, 15B, 15C: Slot 16: First opening edge (opening edge) 17: Second opening edge 18: Third opening edge 20: Coil 20A: Coil segment 20B: Insertion portion 30: Insulating resin 40, 140, 240, 340: Insulating paper 41: Annular portion 42: Protrusion portion 43, 143, 243, 343: Opening 44: Protrusion body 45: Protrusion portion 60: Positioning component 61: Base portion 62: Insertion tube portion 63: Annular base portion 64: Protrusion portion 346: Notch

Claims

1. A method for manufacturing a stator comprising an annular stator core having a plurality of slots formed in a circumferential direction around the axis of the stator core, the method comprising: an arrangement step of arranging insulating paper having openings corresponding to each of the slots at one end of the axial direction of the stator core; and an insertion step of inserting coil segments into the slots from the one end side in the axial direction after performing the arrangement step, wherein the arrangement step arranges the insulating paper so that, when viewed from the axial direction, the edge of the opening of at least a part of the slot protrudes further inward than the opening edge, and the insertion step inserts the coil segments into the slots with the edge of the opening protruding further inward than the opening edge.

2. A method for manufacturing a stator as described in claim 1, wherein the arrangement step arranges the insulating paper so that, when viewed from the axial direction, the edge of the opening protrudes further inward than both ends of the opening edge in the circumferential direction into the slot.

3. A method for manufacturing a stator as described in claim 2, wherein the arrangement step arranges the insulating paper so that the edge of the opening protrudes more inward of the slot than the outer end of the opening edge in the radial direction of the stator core.

4. A method for manufacturing a stator as described in claim 2 or claim 3, wherein the circumferential opening dimension of the opening is smaller than the circumferential width dimension of the coil segment, and further comprising, after performing the insertion process, a filling process of filling insulating resin into the space between the inner surface of the slot and the outer surface of the coil segment from the axial center within the slot.

5. A stator comprising an annular stator core, insulating paper, and a coil, wherein the stator core has a plurality of slots that penetrate the stator core in the axial direction and are arranged in a circumferential direction around the axis of the stator core, the insulating paper has openings corresponding to each of the slots and is arranged at one end of the axial direction of the stator core, a portion of the coil is housed in the slot, and the edges of the openings contact both circumferential ends of the coil that protrude axially from the one end of the stator core.

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