Stator manufacturing method and stator

Abstract

To provide a method of manufacturing a stator in which the axial length of a coil end can be made relatively small.SOLUTION: The method for manufacturing the stator 100 includes a bending step (S40) of bending each of the plurality of coil end portion side walls in the C direction to a tip end portion side 32A of each of the plurality of coil end portion side walls by moving the bending jig 200 relative to the stator core 10 in the direction along the C direction (circumferential direction) of the stator core 10 in a state where each of the plurality of coil end portion side walls is inserted into the recess 201 of the bending jig 200 formed so as to extend along the coil end portion side 32A, and bending each of the plurality of coil end portion side 32A in the C direction to the tip end portion side 32Aa of each of the plurality of coil end portion side 32A.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a stator and a stator. [Background technology]

[0002] BACKGROUND ART Conventionally, there is known a method for manufacturing a stator in which each of a plurality of coil end portions is bent in the circumferential direction (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a method for manufacturing a rotating electric machine stator (a method for manufacturing a stator), in which the tip ends of each of the protruding portions (coil end portions) of multiple segment coils are pressed by the claws of an adjustment jig (bending jig), and the adjustment jig is moved circumferentially relative to the stator core while approaching the stator core, thereby bending and shaping each of the protruding portions of multiple segment coils circumferentially. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-61897 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the manufacturing method of a rotating electric machine stator (stator manufacturing method) described in Patent Document 1, when each of the protruding portions (coil end portions) of the multiple segment coils is bent in the circumferential direction, the tip of the protruding portion of the segment coil is pressed by the claws of the adjustment jig (bending jig). Therefore, when each of the protruding portions of the multiple segment coils is bent in the circumferential direction, the point of load application by the adjustment jig to the protruding portion of the segment coil is always the end of the protruding portion of the segment coil that is closer to the adjustment jig. In other words, when each of the protruding portions of the multiple segment coils is bent in the circumferential direction, the point of load application by the adjustment jig to the protruding portion of the segment coil is always relatively far from the end of the protruding portion of the segment coil that is closer to the stator core. In this case, the radius of curvature of the curved portion of each of the protruding portions of the multiple segment coils that is bent in the circumferential direction tends to be relatively large, and the degree of bending of the curved portion tends to be gentle. As a result, the axial length of the coil end portion tends to be relatively large. For this reason, a technology that enables the axial length (height) of the coil end portion to be relatively short is desired.

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a method for manufacturing a stator and a stator that can make the axial length (height) of the coil end portion relatively small. [Means for solving the problem]

[0007] To achieve the above object, a first aspect of the present invention provides a stator manufacturing method including: a segment coil insertion step of inserting a segment coil including a coil end portion into each of a plurality of slots of a stator core so that the coil end portion, which will become the coil end portion, protrudes axially outward from the axial end face of the stator core along the axial direction; and a bending step of bending each of the plurality of coil end portions circumferentially to the tip end of each of the plurality of coil end portions by inserting each of the plurality of coil end portions into a recess of a bending jig formed to extend along the coil end portion and moving the bending jig relative to the stator core in a direction along the circumferential direction of the stator core. Note that, in this specification, the term "recess" is a broad concept that includes slit-shaped recesses, groove-shaped recesses, hole-shaped recesses, etc. Also, in this specification, the term "direction along ..." is a broad concept that includes both the ... direction itself and a direction relatively close to the ... direction.

[0008] In the stator manufacturing method according to the first aspect of the present invention, as described above, the bending step is a step of bending each of the plurality of coil end portions circumferentially up to the tip of each of the plurality of coil end portions by inserting each of the plurality of coil end portions into a recess of a bending jig formed to extend along the coil end portion and moving the bending jig relative to the stator core in a direction along the circumferential direction of the stator core. As a result, when bending each of the plurality of coil end portions circumferentially, the length of the portion of each of the plurality of coil end portions inserted into the recess of the bending jig gradually decreases, thereby shifting the point of load application by the bending jig to the coil end portion from the stator core side of the coil end portion to the bending jig side. In other words, when bending each of the plurality of coil end portions circumferentially, the point of load application by the bending jig to the coil end portion changes from a position relatively close to the stator core side end of the coil end portion to a position relatively far from the stator core side end of the coil end portion. This allows the radius of curvature of the curved portion of each of the coil end portions on the stator core side after circumferential bending to be smaller than when the load application point on the coil end portion by the bending jig is always relatively far from the stator core side end of the coil end portion when each of the coil end portions is circumferentially bent. This allows the curved portion to be tighter. As a result, the axial length (height) of the coil end portions can be relatively small. Furthermore, because each of the coil end portions is circumferentially bent up to its tip, the axial length (height) of the coil end portions can be smaller than when the tip of each of the coil end portions is not bent. This also allows the axial length (height) of the coil end portions to be relatively small.

[0009] In the above-described method for manufacturing a stator according to the first aspect, the bending step is preferably a step of bending each of the plurality of coil end portions in the circumferential direction up to the respective tip ends of the plurality of coil end portions by moving the bending jig relative to the stator core in a direction along the circumferential direction before the tip ends of each of the plurality of coil end portions come out of the recesses of the bending jig, and by moving the bending jig relative to the stator core while bringing the tip ends of each of the plurality of coil end portions into contact with a protrusion located at the end of the bending jig on the stator core side after the tip ends of each of the plurality of coil end portions come out of the recesses of the bending jig.

[0010] With this configuration, before the tip ends of each of the multiple coil end portions come out of the recesses of the bending jig, the length of each of the multiple coil end portions inserted in the recesses of the bending jig can be gradually reduced by moving the bending jig in a direction along the circumferential direction relative to the stator core, thereby reliably shifting the point of load application by the bending jig to the coil end portion from the stator core side of the coil end portion to the bending jig. This makes it possible to reliably reduce the radius of curvature of the curved portion on the stator core side of each of the multiple coil end portions after bending in the circumferential direction, compared to when the point of load application by the bending jig to the coil end portion is always relatively far from the stator core side end of the coil end portion. Furthermore, after the tip ends of each of the multiple coil end portions have been released from the recesses of the bending jig, the tip ends of each of the multiple coil end portions can be brought into contact with the protrusions located at the end of the bending jig on the stator core side while the bending jig is moved relative to the stator core, thereby allowing the tip ends of each of the multiple coil end portions to be pressed by the protrusions of the bending jig, thereby reliably reducing the axial length (height) of the coil end portions.

[0011] In the above-described method for manufacturing a stator according to the first aspect, the bending step is preferably a step of bending each of the plurality of coil end portions in the circumferential direction up to the tip end of the plurality of coil end portions by moving the bending jig relative to the stator core in a direction along the circumferential direction before the tip end of each of the plurality of coil end portions comes out of the recessed portion of the bending jig, and by adjusting the direction of relative movement of the bending jig relative to the stator core when the tip end of each of the plurality of coil end portions comes out of the recessed portion of the bending jig.

[0012] With this configuration, before the tip ends of each of the multiple coil end portions come out of the recesses of the bending jig, the bending jig can be moved in a direction along the circumferential direction relative to the stator core, thereby reliably reducing the radius of curvature of the curved portion of each of the multiple coil end portions on the stator core side after being bent in the circumferential direction, as described above. Furthermore, when the tip ends of each of the multiple coil end portions come out of the recesses of the bending jig, the direction of the relative movement of the bending jig with respect to the stator core can be adjusted to appropriately adjust the bending angle of each of the multiple coil end portions. As a result, for example, it is easy to ensure the required insulation distance at the tip ends of the coil end portions and the required bonding area at the tip ends of the coil end portions.

[0013] In the method for manufacturing a stator according to the first aspect, the bending step is preferably a step of bending each of the plurality of coil end portions in the circumferential direction up to the tip end of each of the plurality of coil end portions so that the tip end of each of the plurality of coil end portions is inclined toward a side that is parallel to the axial direction and approaches the intermediate portion that is connected to the root portion.

[0014] With this configuration, the tip end of each of the multiple coil end portions is inclined toward the axially parallel intermediate portion connected to the base portion, so that the tip end of the coil end portion can be positioned relatively far from the adjacent coil end portion. As a result, the tip end of the coil end portion can be positioned relatively far from the adjacent coil end portion, making it easy to ensure the necessary insulation distance for the tip end of the coil end portion.

[0015] In addition, in order to achieve the above-mentioned object, a stator in a second aspect of the present invention comprises a stator core including a slot, a slot accommodating portion accommodated in the slot, and a coil formed by joining a plurality of segment coils, each of which includes a coil end portion protruding axially outward along the axial direction from the axial end face of the stator core, wherein the coil end portion is bent and formed in the circumferential direction of the stator core up to its tip, and includes a root portion connected to the slot accommodating portion, an intermediate portion connected to the root portion, and a tip portion connected to the intermediate portion and inclined toward the intermediate portion in a direction parallel to the axial direction.

[0016] In a stator according to a second aspect of the present invention, as described above, the coil end portions are bent in the circumferential direction of the stator core up to their tips. This allows the axial length (height) of the coil end portions to be smaller than when the tips of the coil end portions are not bent. Furthermore, because the coil end portions include tips that are inclined axially outward relative to the intermediate portion, the tips of the coil end portions can be positioned relatively far from adjacent coil end portions. As a result, the necessary insulation distance at the tips of the coil end portions can be easily ensured.

[0017] In the stator according to the second aspect, the coil end portions are preferably configured such that the gaps between the coil end portions and other circumferentially adjacent coil end portions gradually increase from the intermediate portion toward the tip portion.

[0018] With this configuration, the gap between the intermediate portion of the coil end portion and other circumferentially adjacent coil end portions can be made relatively small, allowing the intermediate portion of the coil end portion to be positioned relatively close to the adjacent coil end portions. As a result, the axial length (height) of the coil end portion can be made relatively small. Furthermore, the gap between the distal end portion of the coil end portion and other circumferentially adjacent coil end portions can be made relatively large, allowing the distal end portion of the coil end portion to be positioned relatively far from the adjacent coil end portion. As a result, the necessary insulation distance at the distal end of the coil end portion can be easily ensured. As a result, the axial length (height) of the coil end portion can be made relatively small while easily ensuring the necessary insulation distance at the distal end of the coil end portion.

[0019] In the stator of the second aspect, preferably, the root portion is curved so as to gradually incline away from parallel to the axial direction as it approaches the middle portion, the middle portion extends linearly or is curved so as to gradually incline towards parallel to the axial direction as it approaches the tip portion, and the tip portion is curved so as to gradually incline towards parallel to the axial direction as it approaches the tip.

[0020] With this configuration, the root portion and the intermediate portion can be smoothly connected, and the intermediate portion and the tip portion can also be smoothly connected, which makes it possible to easily ensure the necessary insulation distance at the tip portion of the coil end portion while smoothly connecting the root portion and the intermediate portion, and the intermediate portion and the tip portion.

[0021] In the present application, the following configuration is also considered in the method for manufacturing a stator according to the first aspect.

[0022] (Additional note 1) In a configuration in which the tip end portion of each of the plurality of coil end portions is inclined toward the side parallel to the axial direction relative to the intermediate portion connected to the root portion, the bending process is preferably a process in which each of the plurality of coil end portions is bent circumferentially up to its tip end so that the gap between each of the plurality of coil end portions and other circumferentially adjacent coil end portions gradually widens from the intermediate portion toward the tip end.

[0023] With this configuration, the gap between the intermediate portion of the coil end portion and another circumferentially adjacent coil end portion can be made relatively small, so the intermediate portion of the coil end portion can be positioned relatively close to the adjacent coil end portion. As a result, the axial length (height) of the coil end portion can be made relatively small. Furthermore, the gap between the tip end portion of the coil end portion and another circumferentially adjacent coil end portion can be made relatively large, so the tip end portion of the coil end portion can be positioned relatively far from the adjacent coil end portion. As a result, the required insulation distance at the tip end of the coil end portion can be easily ensured. As a result, the axial length (height) of the coil end portion can be made relatively small while easily ensuring the required insulation distance at the tip end of the coil end portion.

[0024] (Additional note 2) In the above-mentioned configuration in which the tip end portion of each of the plurality of coil end portions is inclined toward being closer to parallel to the axial direction relative to the intermediate portion connected to the root portion, the bending process is preferably a process in which each of the plurality of coil end portions is bent circumferentially up to the tip end portion of each of the plurality of coil end portions so that the root portion is curved so as to be gradually inclined toward being less parallel to the axial direction as it approaches the intermediate portion, the intermediate portion extends in a straight line or is curved so as to be gradually inclined toward being closer to parallel to the axial direction as it approaches the tip portion, and the tip portion is curved so as to be gradually inclined toward being closer to parallel to the axial direction as it approaches the tip.

[0025] This configuration makes it possible to realize a coil end portion that can smoothly connect the root portion and the intermediate portion, and also smoothly connect the intermediate portion and the tip portion. As a result, the necessary insulation distance at the tip portion of the coil end portion can be easily ensured while smoothly connecting the root portion and the intermediate portion, and the intermediate portion and the tip portion. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 2 is a plan view showing a stator according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing a coil of a stator according to an embodiment of the present invention. [Figure 3] 5A to 5C are diagrams illustrating a manufacturing flow of a stator according to an embodiment of the present invention. [Figure 4] 5A to 5C are diagrams for explaining a stator core forming step in the manufacturing flow of the stator according to the embodiment of the present invention. [Figure 5] 10A and 10B are diagrams for explaining the segment coil forming process in the manufacturing flow of a stator according to one embodiment of the present invention. [Figure 6] 10A and 10B are diagrams for explaining the segment coil insertion process in the manufacturing flow of a stator according to one embodiment of the present invention. [Figure 7] FIG. 1 is a diagram (1) for explaining a bending process in the manufacturing flow of a stator according to an embodiment of the present invention. [Figure 8] 5A to 5C are diagrams showing a bending jig used in a bending step in the manufacturing flow of the stator according to the embodiment of the present invention. [Figure 9] FIG. 10 is a diagram (2) for explaining the bending process in the manufacturing flow of the stator according to one embodiment of the present invention. [Figure 10] FIG. 10 is a diagram (3) for explaining a bending process in the manufacturing flow of the stator according to one embodiment of the present invention. [Figure 11] FIG. 4 is a diagram (4) for explaining a bending process in the manufacturing flow of the stator according to one embodiment of the present invention. [Figure 12] FIG. 5 is a diagram (5) for explaining a bending process in the manufacturing flow of the stator according to one embodiment of the present invention. [Figure 13] FIG. 6 is a diagram (6) for explaining a bending process in the manufacturing flow of a stator according to an embodiment of the present invention. [Figure 14] 10A and 10B are diagrams for explaining the segment coil joining process in the manufacturing flow of a stator according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0028] [Stator configuration] The configuration of a stator 100 according to one embodiment of the present invention will be described with reference to FIGS.

[0029] In the following description, the axial, radial, and circumferential directions of the stator core 10 (see FIG. 1) of the stator 100 are referred to as the Z direction, the R direction, and the C direction, respectively. Furthermore, one side of the axial direction (Z direction) is referred to as the Z1 direction and the Z2 direction, respectively. Furthermore, the direction from the radially outer side of the stator core 10 toward the central axis A in the radial direction (R direction) is referred to as the R1 direction, and the direction from the central axis A of the stator core 10 toward the radially outer side is referred to as the R2 direction. Furthermore, one side of the circumferential direction (C direction) is referred to as the C1 direction and the C2 direction, respectively.

[0030] (Overall configuration of the stator) 1, the stator 100, together with a rotor 101 disposed on the R1 side of the stator 100 so as to face the stator 100, constitutes a part of an inner rotor type rotating electric machine 102. The rotating electric machine 102 is, for example, a motor, a generator, or a motor / generator.

[0031] The stator 100 includes a stator core 10 and a coil 20 .

[0032] (Configuration of stator core) Stator core 10 has a cylindrical shape with a central axis A along the Z direction as its central axis. Stator core 10 is formed by stacking a plurality of electromagnetic steel plates (for example, silicon steel plates) in the Z direction.

[0033] The stator core 10 includes an annular back yoke 11 and a plurality of teeth 12 that protrude from the back yoke 11 in the R1 direction and are aligned in the C direction. A slot 13 is formed between each of the teeth 12 that are adjacent to each other in the C direction. That is, the stator core 10 includes a plurality of slots 13 aligned in the C direction. Each of the plurality of teeth 12 and the plurality of slots 13 is formed to extend in the Z direction from an end face 10a of the stator core 10 in the Z1 direction (see FIG. 2) to an end face 10a in the Z2 direction.

[0034] (Coil configuration) The coil 20 is composed of a conductor wire whose main component is any of copper, copper alloy, aluminum, and aluminum alloy, and an insulating coating that covers the conductor wire. The coil 20 is configured to generate magnetic flux when supplied with three-phase AC power. Note that in FIG. 1, portions of the coil 20 other than the slot-receiving portion 31 (see FIG. 2) are not shown.

[0035] As shown in Fig. 2, the coil 20 is formed by joining a plurality of segment coils 30. Each of the plurality of segment coils 30 includes a pair of slot-accommodated portions 31 accommodated in the slot 13, a pair of one-side coil end portions 32 protruding in the Z1 direction from the Z2-direction end face 10a of the stator core 10, and a other-side coil end portion 33 protruding in the Z2 direction from the Z2-direction end face 10a of the stator core 10. The one-side coil end portions 32 are an example of the "coil end portion" in the claims.

[0036] Each of the pair of slot-accommodated portions 31 is accommodated (inserted) in a different slot 13. The tip end portions 32a of the pair of one-side coil end portions 32 are joined (connected) by welding to the tip end portion 32a of the one-side coil end portion 32 of the other segment coil 30 on the Z1 direction side of the stator core 10. The other-side coil end portion 33 connects the pair of slot-accommodated portions 31 to each other on the Z2 direction side of the stator core 10.

[0037] As shown in Figure 1, each of the multiple slots 13 accommodates multiple segment coils 30 (including slot accommodating portions 31 (see Figure 2)) lined up in the R direction. Note that Figure 1 shows an example in which each of the multiple slots 13 accommodates eight segment coils 30 lined up in the R direction.

[0038] 2, where n≧1, k≧0, the tip 32a of one coil end portion 32 of the (n+2k)th turn segment coil 30 and the tip 32a of one coil end portion 32 of the (n+2k+1)th turn segment coil 30 are joined (connected) by welding. Note that the "...th turn segment coil 30" refers to the segment coil 30 in the ...th row from the inner diameter side of the stator core 10.

[0039] The one-side coil end portion 32 of the (n+2k)th-turn segment coil 30 is bent in the C2 direction (circumferential direction) to the tip end portion 32a. The one-side coil end portion 32 of the (n+2k)th-turn segment coil 30 includes a root portion 32c connected to the slot-accommodated portion 31, an intermediate portion 32b connected to the root portion 32c and inclined relative to the Z-direction end face 10a of the stator core 10 so as to move in the C2 direction as it moves away from the Z1-direction end face 10a of the stator core 10 in the Z1 direction, and a tip end portion 32a connected to the intermediate portion 32b and inclined toward the intermediate portion 32b in the Z direction (axial direction). The one-side coil end portion 32 of the (n+2k)th-turn segment coil 30 is configured so that the gap Ca between the one-side coil end portion 32 adjacent in the C2 direction (circumferential direction) gradually increases from the intermediate portion 32b toward the tip end portion 32a. The root portion 32c is curved to connect the Z1-direction end of the slot-accommodating portion 31 and the Z2-direction (axially inner) end of the intermediate portion 32b. The root portion 32c is curved so as to gradually incline away from parallel to the Z direction (axial direction) as it approaches the intermediate portion 32b. The intermediate portion 32b extends linearly, or is curved so as to gradually incline toward parallel to the Z direction (axial direction) as it approaches the tip portion 32a. The tip portion 32a is curved so as to incline toward parallel to the Z direction (axial direction) as it approaches the tip.

[0040] The one-side coil end portion 32 of the (n+2k+1)-th turn segment coil 30 is bent in the C1 direction (circumferential direction) to the tip end portion 32a. The one-side coil end portion 32 of the (n+2k+1)-th turn segment coil 30 includes a root portion 32c connected to the slot-accommodated portion 31, an intermediate portion 32b connected to the root portion 32c and inclined toward the Z-direction end face 10a of the stator core 10 so as to move in the C1 direction as it moves away from the Z1-direction end face 10a of the stator core 10 in the Z1 direction, and a tip end portion 32a connected to the intermediate portion 32b and inclined toward the intermediate portion 32b in the Z direction (axial direction). The one-side coil end portion 32 of the (n+2k+1)-th turn segment coil 30 is configured so that the gap Ca between the one-side coil end portion 32 adjacent in the C1 direction (circumferential direction) gradually increases from the intermediate portion 32b toward the tip end portion 32a. The root portion 32c is curved to connect the Z1-direction end of the slot-accommodating portion 31 and the Z2-direction (axially inner) end of the intermediate portion 32b. The root portion 32c is curved so as to gradually incline away from parallel to the Z direction (axial direction) as it approaches the intermediate portion 32b. The intermediate portion 32b extends linearly, or is curved so as to gradually incline toward parallel to the Z direction (axial direction) as it approaches the tip portion 32a. The tip portion 32a is curved so as to incline toward parallel to the Z direction (axial direction) as it approaches the tip.

[0041] [Stator manufacturing method] A method for manufacturing the stator 100 according to one embodiment of the present invention will be described with reference to FIGS.

[0042] (Stator core forming process) As shown in Fig. 3, a stator core forming step is performed in step S10. As shown in Fig. 4, the stator core forming step (S10) is a step of forming a stator core 10 including a plurality of slots 13 aligned in the C direction.

[0043] (Segment coil forming process) As shown in Fig. 3, a segment coil forming process is performed in step S20. As shown in Fig. 5, the segment coil forming process (S20) is a process for forming a substantially U-shaped segment coil 30A. The segment coil 30A is an example of a "segment coil (including a coil end portion)" in the claims.

[0044] (Segment coil insertion process) As shown in Fig. 3, a segment coil insertion process is performed in step S30. As shown in Fig. 6, the segment coil insertion process (S30) is a process of inserting a segment coil 30A including a coil end portion 32A into each of the multiple slots 13 of the stator core 10 so that the coil end portion 32A, which becomes the one-side coil end portion 32, protrudes in the Z1 direction (axially outward) along the Z direction from the Z1-direction end face 10a of the stator core 10. Note that, when the segment coil 30A including the coil end portion 32A is inserted into each of the multiple slots 13 of the stator core 10, a pair of slot-accommodated portions 31 and a second-side coil end portion 33 of the segment coil 30 (see Fig. 2) are formed.

[0045] (Bending process) As shown in Fig. 3, a bending process is performed in step S40. As shown in Fig. 7 and Fig. 9 to Fig. 13, the bending process (S40) is a process in which, with each of the multiple coil end portions 32A inserted into a recess 201 of a bending jig 200 formed to extend along the coil end portion 32A, the bending jig 200 is moved in a direction along direction C (circumferential direction) relative to the stator core 10, thereby bending each of the multiple coil end portions 32A in direction C up to the tip end portion 32Aa of each of the multiple coil end portions 32A. Specifically, the bending process (S40) is a process in which, before the tip end portions 32Aa of each of the multiple coil end portions 32A come out of the recessed portions 201 of the bending jig 200, the bending jig 200 is moved in a direction along the C direction relative to the stator core 10, and after the tip end portions 32Aa of each of the multiple coil end portions 32A come out of the recessed portions 201 of the bending jig 200, the bending jig 200 is moved relative to the stator core 10 while bringing the tip end portions 32Aa of each of the multiple coil end portions 32A into contact with the protrusions 202 located at the end of the bending jig 200 on the stator core 10 side, thereby bending each of the multiple coil end portions 32A in the C direction up to the tip end portions 32Aa of each of the multiple coil end portions 32A.

[0046] First, as shown in FIG. 7, each of the multiple coil end portions 32A is inserted into a recess 201 of a bending jig 200 that is formed to extend along the coil end portion 32A. As shown in FIG. 8, the bending jig 200 is formed in an annular shape. The bending jig 200 includes multiple recesses 201 aligned in the C direction. Each of the multiple recesses 201 is formed to extend in the Z direction. Each of the multiple recesses 201 is formed in a slit shape that opens toward the stator core 10. Each of the multiple recesses 201 is formed at a position corresponding to each of the multiple slots 13 of the stator core 10. Furthermore, a protrusion 202 is formed between each of the recesses 201 adjacent to each other in the C direction. That is, the bending jig 200 includes multiple protrusions 202 aligned in the C direction. 9 to 11, before the tip portions 32Aa of the plurality of coil end portions 32A are released from the recessed portions 201 of the bending jig 200, the bending jig 200 is moved in a direction along direction C (circumferential direction) relative to the stator core 10, with the plurality of coil end portions 32A still inserted in the recessed portions 201 of the bending jig 200. Then, as shown in FIG. 12, after the tip portions 32Aa of the plurality of coil end portions 32A are released from the recessed portions 201 of the bending jig 200, the bending jig 200 is moved relative to the stator core 10 while the tip portions 32Aa of the plurality of coil end portions 32A are in contact with the protruding portions 202 of the bending jig 200. 13, when the bending jig 200 moves away from the stator core 10, the tip end 32Aa of each of the plurality of coil end portions 32A that was pressed by the protrusions 202 of the bending jig 200 elastically returns (springs back), and the bending angle (warping angle) of the tip end 32Aa of each of the coil end portions 32A becomes θ2. In this way, each of the plurality of coil end portions 32A is bent in the C direction up to the tip end 32Aa of each of the plurality of coil end portions 32A.

[0047] 7 and 9 to 12, the bending step (S40) is a step of bending each of the plurality of coil end portions 32A in the C direction up to the tip end 32Aa of each of the plurality of coil end portions 32A while moving the bending jig 200 in a direction along the C direction (circumferential direction) relative to the stator core 10 so that the length L of the portion of each of the plurality of coil end portions 32A inserted into the recess 201 of the bending jig 200 gradually decreases. Specifically, as each of the plurality of coil end portions 32A is bent in the C1 or C2 direction from a state in which it extends along the Z direction, the tip end 32Aa of each of the plurality of coil end portions 32A gradually moves closer to the stator core 10. Furthermore, when bending each of the plurality of coil end portions 32A in the C direction, the bending jig 200 is moved in a direction along the C direction (circumferential direction) relative to the stator core 10. Therefore, the length L of each of the coil end portions 32A inserted into the recess 201 of the bending jig 200 gradually decreases. That is, as shown in FIG. 7 , at the start of bending each of the coil end portions 32A in the C direction, the length L of each of the coil end portions 32A inserted into the recess 201 of the bending jig 200 is L1. Then, as shown in FIG. 9 , as bending each of the coil end portions 32A in the C direction progresses, the length L of each of the coil end portions 32A inserted into the recess 201 of the bending jig 200 becomes L2, which is smaller than L1. Then, as shown in FIG. 10 , as bending each of the coil end portions 32A in the C direction further progresses, the length L of each of the coil end portions 32A inserted into the recess 201 of the bending jig 200 becomes L3, which is smaller than L2. Then, as shown in Figure 11, as the bending of each of the multiple coil end portions 32A in the C direction progresses further, the length L of the portion of each of the multiple coil end portions 32A inserted into the recess 201 of the bending jig 200 becomes L4, which is smaller than L3.Then, as shown in Figure 12, when the tip end portion 32Aa of each of the multiple coil end portions 32A comes out of the recess 201 of the bending jig 200, the length L of the portion of each of the multiple coil end portions 32A inserted into the recess 201 of the bending jig 200 becomes zero.

[0048] 7 and 9 to 12, the bending step (S40) is a step of bending each of the plurality of coil end portions 32A in the C direction up to the tip end 32Aa of each of the plurality of coil end portions 32A while moving the bending jig 200 in a direction C (circumferential direction) relative to the stator core 10 so that the length L of the portion of each of the plurality of coil end portions 32A inserted into the recess 201 of the bending jig 200 gradually decreases, thereby moving the point of application of the load of the bending jig 200 to the coil end portion 32A from the stator core 10 side of the coil end portion 32A to the bending jig 200 side. Specifically, as shown in FIG. 9, the load applied to the coil end portion 32A by the bending jig 200 acts on the portion of each of the plurality of coil end portions 32A inserted into the recess 201 of the bending jig 200 (mainly the end portion on the stator core 10 side). Therefore, as the length L of each of the multiple coil end portions 32A inserted into the recess 201 of the bending jig 200 gradually decreases, the load application point on the coil end portion 32A by the bending jig 200 gradually moves from the stator core 10 side of the coil end portion 32A to the bending jig 200 side.

[0049] 7 and 9 to 12, the bending step (S40) is a step of bending each of the plurality of coil end portions 32A in the C direction (circumferential direction) while moving the bending jig 200 relative to the stator core 10 in a direction parallel to (along a direction parallel to) the end face 10a of the stator core 10. Therefore, before the tip end 32Aa of each of the plurality of coil end portions 32A comes out of the recess 201 of the bending jig 200, the position of the bending jig 200 in the Z direction (for example, position P20 in the Z direction of the end of the bending jig 200 on the stator core 10 side) does not change with respect to position P10 in the Z direction of the end face 10a of the stator core 10, as viewed from the R direction.

[0050] As shown in Figures 7 and 9 to 13, the bending process (S40) is a process in which, before the tip ends 32Aa of each of the multiple coil end portions 32A come out of the recesses 201 of the bending jig 200, the bending jig 200 is moved in a direction along the C direction relative to the stator core 10, and when the tip ends 32Aa of each of the multiple coil end portions 32A come out of the recesses 201 of the bending jig 200, the direction D (see Figure 11) of movement of the bending jig 200 relative to the stator core 10 is adjusted, thereby bending each of the multiple coil end portions 32A in the C direction up to the tip ends 32Aa of each of the multiple coil end portions 32A. As shown in Fig. 11, when adjusting the bending angle θ2 of each of the tip portions 32Aa of the multiple coil end portions 32A, the direction D of movement of the bending jig 200 relative to the stator core 10 is a direction in which the angle θ1 with respect to the Z direction is between 0 and 90 degrees. That is, the direction D of movement of the bending jig 200 relative to the stator core 10 is either a direction parallel to the Z direction (θ1 = 0 degree) or a direction inclined toward the C direction with respect to the Z direction when viewed from the R direction (0 < θ1 ≦ 90 degrees). The direction D of movement of the bending jig 200 relative to the stator core 10 is adjusted by adjusting the angle θ1 in the range from 0 to 90 degrees. Note that Figs. 11 and 12 show an example in which the angle θ1 is 90 degrees.

[0051] The direction D of movement of the bending jig 200 relative to the stator core 10 is determined and adjusted in advance through experiments, etc., from the perspective of ensuring an insulation distance for the tip end 32a of the one-side coil end portion 32, ensuring a sufficient bonding area for the tip end 32a of the one-side coil end portion 32, etc. For example, when ensuring a relatively large insulation distance for the tip end 32a of the one-side coil end portion 32, the direction D of movement of the bending jig 200 relative to the stator core 10 is adjusted so that the angle θ1 is relatively small in order to make the bending angle θ2 relatively large. Furthermore, when ensuring a relatively small insulation distance for the tip end 32a of the one-side coil end portion 32, the direction D of movement of the bending jig 200 relative to the stator core 10 is adjusted so that the angle θ1 is relatively large in order to make the bending angle θ2 relatively small. Furthermore, for example, when ensuring the joining area of ​​the tip end 32a of the one-side coil end portion 32, the direction D of movement of the bending jig 200 relative to the stator core 10 is adjusted so that the bending angle θ2 is set to a value that enables optimal mating surface welding. For example, FIG. 13 shows an example in which the direction D of movement of the bending jig 200 relative to the stator core 10 is adjusted so that the bending angle θ2 is approximately 45 degrees. In this case, as shown in FIG. 14, the tip ends 32a to be joined can be overlapped more than when the bending angle θ2 is other than 45 degrees, making it easy to ensure the required joining area. Note that the bending angle θ2 is the angle at which the tip end 32Aa of the coil end portion 32A is inclined with respect to a direction parallel to the end face 10a of the stator core 10 when viewed from the R direction.

[0052] 13, the bending step (S40) is a step of bending each of the plurality of coil end portions 32A in the C direction up to the tip end 32Aa of each of the plurality of coil end portions 32A so that the tip end 32Aa of each of the plurality of coil end portions 32A is inclined toward a side parallel to the Z direction (axial direction) with respect to the intermediate portion 32Ab connected to the root portion 32Ac. Specifically, the bending step (S40) is a step of bending each of the plurality of coil end portions 32A in the C direction up to the tip end 32Aa of each of the plurality of coil end portions 32A so that the gap CAa between each of the plurality of coil end portions 32A adjacent in the C direction gradually widens from the intermediate portion 32Ab toward the tip end 32Aa. More specifically, the bending process (S40) is a process of bending each of the multiple coil end portions 32A circumferentially up to the tip end portion 32Aa of each of the multiple coil end portions 32A so that the root portion 32Ac curves so as to gradually incline away from parallel to the Z direction (axial direction) as it approaches the middle portion 32Ab, the middle portion 32Ab extends in a straight line or curves so as to gradually incline towards parallel to the Z direction (axial direction) as it approaches the tip end portion 32Aa, and the tip end portion 32Aa curves so as to gradually incline towards parallel to the Z direction (axial direction) as it approaches the tip.

[0053] As shown in Figures 7 and 9 to 12, as the bending of each of the multiple coil end portions 32A in the C direction progresses, the point at which the load applied by the bending jig 200 to the coil end portion 32A moves from the stator core 10 side of the coil end portion 32A to the bending jig 200 side, and therefore the stator core 10 side of the coil end portion 32A tends to curve so as to gradually incline toward being closer to parallel to the Z direction (axial direction) as it approaches the tip portion 32Aa, compared to the bending jig 200 side of the coil end portion 32A. 10 and 11, when the tip end portions 32Aa of the multiple coil end portions 32A come out of the recessed portion 201 of the bending jig 200, one side surface of the tip end portions 32Aa of the coil end portions 32A continues to contact one side surface of the recessed portion 201, while the other side surface of the tip end portions 32Aa of the coil end portions 32A gradually loses contact with the other side surface of the recessed portion 201. As a result, the tip end portions 32Aa of the coil end portions 32A tend to curve so as to gradually incline toward being more parallel to the Z direction (axial direction) as they approach their tip ends. For these reasons, the tip end portions 32Aa curve so as to gradually incline toward being more parallel to the Z direction (axial direction) as they approach their tip ends. Therefore, the gap CAa between the tip end portions 32Aa and adjacent coil end portions 32A in the C direction gradually widens from the intermediate portions 32Ab toward the tip end portions 32Aa.

[0054] (Segment coil joining process) As shown in Fig. 3, a segment coil joining process is performed in step S50. As shown in Fig. 14, the segment coil joining process (S50) is a process of forming a coil 20 by joining a plurality of segment coils 30. Specifically, the tip end 32a of one side coil end portion 32 of the (n+2k)th turn segment coil 30 and the tip end 32a of one side coil end portion 32 of the (n+2k+1)th turn segment coil 30 are joined (connected) by welding.

[0055] (Effects of the embodiment) In this embodiment, the following effects can be obtained.

[0056] In the present embodiment, as described above, the bending step (40) is a step in which, with each of the plurality of coil end portions 32A inserted into a recess 201 of a bending jig 200 formed to extend along the coil end portion 32A, the bending jig 200 is moved in a direction along the C direction (circumferential direction) of the stator core 10 relative to the stator core 10, thereby bending each of the plurality of coil end portions 32A in the C direction up to the tip end 32Aa of each of the plurality of coil end portions 32A. As a result, when each of the plurality of coil end portions 32A is bent in the C direction, the length of the portion of each of the plurality of coil end portions 32A inserted into the recess 201 of the bending jig 200 gradually decreases, so that the point of application of the load of the bending jig 200 on the coil end portion 32A can be shifted from the stator core 10 side of the coil end portion 32A to the bending jig 200 side. That is, when each of the plurality of coil end portions 32A is bent in the C direction, the point of load application on the coil end portion 32A by the bending jig 200 changes from a position relatively close to the end of the coil end portion 32A facing the stator core 10 to a position relatively far from it. As a result, compared to when the point of load application on the coil end portion 32A by the bending jig 200 is always relatively far from the end of the coil end portion 32A facing the stator core 10 when each of the plurality of coil end portions 32A is bent in the C direction, the radius of curvature of the root portion 32Ac (the curved portion on the stator core 10 side) of each of the plurality of coil end portions 32A after being bent in the C direction can be made smaller, and the degree of bending of the root portion 32Ac (the curved portion) can be made tighter. As a result, the length (height) of the one side coil end portion 32 (coil end portion) in the Z direction (axial direction) can be made relatively small. Furthermore, since each of the multiple coil end portions 32A is bent in the C direction up to the tip end 32Aa of each of the multiple coil end portions 32A, the length (height) in the Z direction of the coil end portions 32A can be made smaller than when the tip end 32Aa of each of the multiple coil end portions 32A is not bent.This also makes it possible to make the length (height) of the one-side coil end portion 32 in the Z direction relatively small.

[0057] Furthermore, in this embodiment, as described above, the bending process (40) is a process in which, before the tip ends 32Aa of each of the multiple coil end portions 32A come out of the recesses 201 of the bending jig 200, the bending jig 200 is moved in a direction along the C direction (circumferential direction) relative to the stator core 10, and after the tip ends 32Aa of each of the multiple coil end portions 32A come out of the recesses 201 of the bending jig 200, the bending jig 200 is moved relative to the stator core 10 while bringing the tip ends 32Aa of each of the multiple coil end portions 32A into contact with the protrusions 202 located at the end of the bending jig 200 on the stator core 10 side, thereby bending each of the multiple coil end portions 32A in the C direction up to the tip ends 32Aa of each of the multiple coil end portions 32A. As a result, before the tip portions 32Aa of each of the multiple coil end portions 32A come out of the recesses 201 of the bending jig 200, the length of the portion of each of the multiple coil end portions 32A inserted into the recesses 201 of the bending jig 200 gradually decreases by moving the bending jig 200 in a direction along the C direction relative to the stator core 10, so that the point of load application by the bending jig 200 to the coil end portion 32A can be reliably moved from the stator core 10 side of the coil end portion 32A to the bending jig 200 side. This ensures that when each of the multiple coil end portions 32A is bent in the C direction, the radius of curvature of the root portion 32Ac (the curved portion on the stator core 10 side) of each of the multiple coil end portions 32A after being bent in the C direction can be made smaller than when the point of load application to the coil end portion 32A by the bending jig 200 is always located relatively far from the end of the coil end portion 32A on the stator core 10 side.Furthermore, after the tip end portions 32Aa of each of the multiple coil end portions 32A have been released from the recessed portions 201 of the bending jig 200, the tip end portions 32Aa of each of the multiple coil end portions 32A can be pressed by the protruding portions 202 of the bending jig 200 by moving the bending jig 200 relative to the stator core 10 while bringing the tip end portions 32Aa of each of the multiple coil end portions 32A into contact with the protruding portions 202 located at the end of the bending jig 200 on the stator core 10 side, thereby reliably reducing the length (height) of the coil end portions 32A in the Z direction (axial direction).

[0058] Furthermore, in this embodiment, as described above, the bending process (40) is a process in which, before the tip ends 32Aa of each of the multiple coil end portions 32A come out of the recesses 201 of the bending jig 200, the bending jig 200 is moved in a direction along the C direction (circumferential direction) relative to the stator core 10, and when the tip ends 32Aa of each of the multiple coil end portions 32A come out of the recesses 201 of the bending jig 200, the direction D of movement of the bending jig 200 relative to the stator core 10 is adjusted, thereby bending each of the multiple coil end portions 32A in the C direction up to the tip ends 32Aa of each of the multiple coil end portions 32A. As a result, before the tip ends 32Aa of each of the plurality of coil end portions 32A come out of the recesses 201 of the bending jig 200, the bending jig 200 can be moved in the direction C relative to the stator core 10, thereby reliably reducing the radius of curvature of the curved portion of each of the plurality of coil end portions 32A facing the stator core 10 after being bent in the direction C, as described above. Furthermore, when the tip ends 32Aa of each of the plurality of coil end portions 32A come out of the recesses 201 of the bending jig 200, the bending angle θ2 of each of the tip ends 32Aa of each of the plurality of coil end portions 32A can be appropriately adjusted by adjusting the direction D of movement of the bending jig 200 relative to the stator core 10. As a result, for example, it is possible to easily ensure a required insulation distance for the tip ends 32Aa of one coil end portion 32 and a required bonding area for the tip ends 32Aa of one coil end portion 32.

[0059] Furthermore, in this embodiment, as described above, the bending process (40) is a process of bending each of the multiple coil end portions 32A in the C direction (circumferential direction) up to the multiple coil end portion 32A so that the tip end 32Aa of each of the multiple coil end portions 32A is inclined toward the side parallel to the Z direction (axial direction) relative to the intermediate portion 32Ab connected to the root portion 32Ac. This causes the tip end 32Aa of each of the multiple coil end portions 32A to be inclined toward the side parallel to the Z direction relative to the intermediate portion 32Ab connected to the root portion 32Ac, thereby allowing the tip end 32Aa of the coil end portion 32A to be positioned relatively far from the adjacent coil end portion 32A. As a result, the tip end 32Aa of the one-side coil end portion 32 can be positioned relatively far from the adjacent one-side coil end portion 32, making it easy to ensure the necessary insulation distance for the tip end 32Aa of the one-side coil end portion 32.

[0060] In the present embodiment, as described above, the bending process (40) involves bending each of the plurality of coil end portions 32A in the C direction up to the tip end 32Aa of each of the plurality of coil end portions 32A so that the gap CAa between each of the plurality of coil end portions 32A and adjacent coil end portions 32A in the C direction (circumferential direction) gradually increases from the intermediate portion 32Ab toward the tip end 32Aa. This allows the gap CAa between the intermediate portion 32Ab of each coil end portion 32A and adjacent coil end portions 32A in the C direction to be relatively small, so that the intermediate portion 32Ab of each coil end portion 32A can be positioned relatively close to the adjacent coil end portion 32A. As a result, the length (height) of one coil end portion 32 in the Z direction (axial direction) can be relatively small. Furthermore, since the gap CAa between the tip end 32Aa of the coil end portion 32A and another coil end portion 32A adjacent in the C direction can be made relatively large, the tip end 32Aa of the coil end portion 32A can be positioned relatively far from the adjacent coil end portion 32A. As a result, the necessary insulation distance for the tip end 32a of the one coil end portion 32 can be easily ensured. As a result, the length (height) of the one coil end portion 32 in the Z direction can be made relatively small, while easily ensuring the necessary insulation distance for the tip end 32a of the one coil end portion 32.

[0061] In the present embodiment, as described above, the bending step (40) is a step of bending each of the plurality of coil end portions 32A in the C direction up to the tip end portion 32Aa of each of the plurality of coil end portions 32A so that the root portion 32Ac is curved so as to gradually incline away from parallel to the Z direction as it approaches the intermediate portion 32Ab, the intermediate portion 32Ab extends linearly or is curved so as to gradually incline toward parallel to the Z direction as it approaches the tip end portion 32Aa, and the tip end portion 32Aa is curved so as to gradually incline toward parallel to the Z direction as it approaches the tip. This makes it possible to smoothly connect the root portion 32c and the intermediate portion 32b, and to realize a one-side coil end portion 32 (coil end portion) that smoothly connects the intermediate portion 32b and the tip end portion 32a. As a result, the necessary insulation distance of the tip end portion 32a of the one side coil end portion 32 can be easily ensured while smoothly connecting the root portion 32c and the intermediate portion 32b and the intermediate portion 32b and the tip end portion 32a.

[0062] Furthermore, in this embodiment, as described above, the one-side coil end portion 32 (coil end portion) is bent in the C direction (circumferential direction) of the stator core 10 up to the tip end 32a. As a result, the one-side coil end portion 32 is bent in the C direction of the stator core 10 up to the tip end 32a, so the length (height) of the one-side coil end portion 32 in the Z direction (axial direction) can be made smaller than when the tip end 32a of the one-side coil end portion 32 is not bent. Furthermore, because the one-side coil end portion 32 includes the tip end 32a that is inclined toward the intermediate portion 32b in the Z direction in parallel with the Z direction, the tip end 32a of the one-side coil end portion 32 can be positioned relatively far from the adjacent one-side coil end portion 32. As a result, the necessary insulation distance of the tip end 32a of the one-side coil end portion 32 can be easily ensured.

[0063] Furthermore, in this embodiment, as described above, the one-side coil end portion 32 (coil end portion) is configured so that the gap Ca between the other one-side coil end portion 32 adjacent in the C direction gradually increases from the intermediate portion 32b toward the tip end 32a. This allows the gap Ca between the intermediate portion 32b of the one-side coil end portion 32 and the other one-side coil end portion 32 adjacent in the C direction to be relatively small, so the intermediate portion 32b of the one-side coil end portion 32 can be positioned relatively close to the adjacent one-side coil end portion 32. As a result, the axial length (height) of the one-side coil end portion 32 can be relatively small. Furthermore, the gap Ca between the tip end 32a of the one-side coil end portion 32 and the other one-side coil end portion 32 adjacent in the C direction can be relatively large, so the tip end 32a of the one-side coil end portion 32 can be positioned relatively far from the adjacent one-side coil end portion 32. As a result, the required insulation distance of the tip end 32a of the one-side coil end portion 32 can be easily ensured. As a result, the necessary insulation distance of the tip end 32a of the one side coil end portion 32 can be easily ensured while keeping the axial length (height) of the one side coil end portion 32 relatively small.

[0064] Furthermore, in this embodiment, as described above, the root portion 32c is curved so as to gradually incline away from parallel to the Z direction (axial direction) as it approaches the intermediate portion 32b, the intermediate portion 32b extends linearly or is curved so as to gradually incline toward parallel to the Z direction as it approaches the tip portion, and the tip portion 32a is curved so as to gradually incline toward parallel to the Z direction as it approaches the tip portion. This allows for a smooth connection between the root portion 32c and the intermediate portion 32b, and also between the intermediate portion 32b and the tip portion 32a. As a result, the necessary insulation distance for the tip portion 32a of the one-side coil end portion 32 can be easily ensured while smoothly connecting the root portion 32c and the intermediate portion 32b and the intermediate portion 32b and the tip portion 32a.

[0065] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than the above description of the embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0066] For example, in the above embodiment, an example was shown in which the bending step (S40) is a step of bending each of the plurality of coil end portions 32A in the C direction up to the tip end 32Aa of each of the plurality of coil end portions 32A while moving the bending jig 200 relative to the stator core 10 in a direction parallel to the end face 10a of the stator core 10 and along the C direction (circumferential direction), but the present invention is not limited to this. In the present invention, the bending step may also be a step of bending each of the plurality of coil end portions in the circumferential direction up to the tip end of each of the plurality of coil end portions while moving the bending jig relative to the stator core in a direction not parallel to the end face of the stator core and along the circumferential direction. For example, the bending process may be a process in which a bending jig is moved in a direction inclined away from the end face of the stator core relative to a direction parallel to the end face of the stator core and in a direction along the circumferential direction, while bending each of the multiple coil end portions circumferentially up to the tip end of each of the multiple coil end portions.

[0067] In the above embodiment, the bending step (S40) is an example in which, with each of the plurality of coil end portions 32A inserted into a recess 201 of a bending jig 200 formed to extend along the coil end portion 32A, the bending jig 200 is moved in a direction along the C direction (circumferential direction) relative to the stator core 10, thereby bending each of the plurality of coil end portions 32A in the C direction up to the tip end 32Aa of each of the plurality of coil end portions 32A. However, the present invention is not limited to this. In the present invention, the bending step may also be a step in which, with each of the plurality of coil end portions inserted into a recess 201 of the bending jig formed to extend along the coil end portion, the stator core is moved in a direction along the circumferential direction relative to the bending jig, thereby bending each of the plurality of coil end portions in the circumferential direction up to the tip end of each of the plurality of coil end portions.

[0068] In addition, in the above embodiment, an example was shown in which the bending process (S40) is a process in which, before the tip ends 32Aa of each of the multiple coil end portions 32A come out of the recesses 201 of the bending jig 200, the bending jig 200 is moved in a direction along the C direction relative to the stator core 10, and after the tip ends 32Aa of each of the multiple coil end portions 32A come out of the recesses 201 of the bending jig 200, the bending jig 200 is moved relative to the stator core 10 while bringing the tip ends 32Aa of each of the multiple coil end portions 32A into contact with the protrusions 202 located at the end of the bending jig 200 on the stator core 10 side, thereby bending each of the multiple coil end portions 32A in the C direction up to the tip ends 32Aa of each of the multiple coil end portions 32A, but the present invention is not limited to this. In the present invention, the bending process may be a process in which, before the tip ends of each of the plurality of coil end portions come out of the recesses of the bending jig, the bending jig is moved relative to the stator core in a direction along the circumferential direction, and after the tip ends of each of the plurality of coil end portions come out of the recesses of the bending jig, the bending jig is moved relative to the stator core without bringing the tip ends of each of the plurality of coil end portions into contact with the protrusion located at the end of the bending jig on the stator core side, thereby circumferentially bending each of the plurality of coil end portions up to the tip end of each of the plurality of coil end portions.

[0069] In the above embodiment, an example was shown in which each of the plurality of recesses 201 of the bending jig 200 was formed in a slit shape, but the present invention is not limited to this. In the present invention, each of the plurality of recesses of the bending jig may be formed in a groove shape or a hole shape. [Explanation of symbols]

[0070] 10... stator core, 10a... axial end face (of stator core), 13... slot, 20... coil, 30... segment coil (including coil end portion), 30A... segment coil (including coil end portion), 31... slot accommodating portion, 32... coil end portion, 32a... tip portion (of coil end portion), 32b... middle portion (of coil end portion), 32c... root portion (of coil end portion), 32A... coil end portion, 32Aa... tip portion (of coil end portion), 32Ab... middle portion (of coil end portion), 32Ac... root portion (of coil end portion), 100... stator, 200... bending jig, 201... recess (of bending jig), 202... protrusion (of bending jig), Ca... gap (between other circumferentially adjacent coil end portions)

Claims

1. a segment coil insertion process for inserting a segment coil including a coil end portion into each of a plurality of slots of the stator core so that the coil end portion that becomes the coil end portion protrudes from an end face of the stator core along the axial direction to the outside in the axial direction; A method for manufacturing a stator, comprising: after the segment coil insertion process, a bending process in which each of the plurality of coil end portions is inserted into a recess of a bending jig formed to extend along the coil end portion, and the bending jig is moved relative to the stator core in a direction along the circumferential direction of the stator core, thereby bending each of the plurality of coil end portions in the circumferential direction up to the tip of each of the plurality of coil end portions.

2. 2. The method for manufacturing a stator according to claim 1, wherein the bending process is a process of bending each of the plurality of coil end portions in the circumferential direction up to the tip end of each of the plurality of coil end portions by moving the bending jig relative to the stator core in a direction along the circumferential direction before the tip end portions of each of the plurality of coil end portions come out of the recesses of the bending jig, and by moving the bending jig relative to the stator core while bringing the tip end portions of each of the plurality of coil end portions into contact with a protrusion located at an end of the bending jig on the stator core side after the tip end portions of each of the plurality of coil end portions come out of the recesses of the bending jig.

3. 2. The method for manufacturing a stator according to claim 1, wherein the bending process is a process of bending each of the plurality of coil end portions in the circumferential direction up to the tip end of the plurality of coil end portions by moving the bending jig relative to the stator core in a direction along the circumferential direction before the tip end of each of the plurality of coil end portions comes out of the recessed portion of the bending jig, and by adjusting the direction of relative movement of the bending jig with respect to the stator core when the tip end of each of the plurality of coil end portions comes out of the recessed portion of the bending jig.

4. 2. The method for manufacturing a stator according to claim 1, wherein the bending process is a process of bending each of the plurality of coil end portions in the circumferential direction up to the tip end portion of each of the plurality of coil end portions so that the tip end portion of each of the plurality of coil end portions is inclined toward a side that approaches parallel to the axial direction relative to an intermediate portion connected to a root portion.

5. a stator core including slots; a coil formed by joining a plurality of segment coils, each of which includes a slot-accommodated portion accommodated in the slot and a coil end portion protruding outward in the axial direction from an end face of the stator core along the axial direction, The coil end portion is bent and formed in the circumferential direction of the stator core up to the tip portion, and includes a root portion connected to the slot accommodating portion, an intermediate portion connected to the root portion, and the tip portion connected to the intermediate portion and inclined toward the intermediate portion in a direction parallel to the axial direction.

6. 6. The stator according to claim 5, wherein the coil end portions are configured such that a gap between each of the coil end portions and each of the coil end portions adjacent thereto in the circumferential direction gradually increases from the intermediate portion toward the tip portion.

7. the root portion is curved so as to gradually incline away from being parallel to the axial direction as it approaches the intermediate portion, the intermediate portion extends linearly or is curved so as to gradually become closer to the axial direction as it approaches the tip portion, 6. The stator according to claim 5, wherein the tip portion is curved so as to be gradually inclined toward a side that approaches parallel to the axial direction as it approaches the tip.

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