Clamping device and method for manufacturing a stator

Abstract

To reduce possibility that heat generated due to welding damages a coating of a segment coil.SOLUTION: A clamp device performs clamp operation to connect a first peeling part in which a coating at a first end part is peeled and a second peeling part in which a coating at a second end part 34b is peeled through laser welding. A second pawl 60b extends in a radial direction of a second shaft 58b. The clamp device performs clamp operation for rotating the second shaft 58B with a center axis of the second shaft 58B as a center until the second pawl 60b abuts on the second end part 34b in a state in which a first shaft 58A and the second shaft 58B move toward a stator core so that the first end part and the second end part 34b are sandwiched between the first shaft 58A and the second shaft 58B, the first shaft 58A is pressed against a second curvature part 34a and the second shaft 58B is pressed against a first curvature part 32a.SELECTED DRAWING: Figure 12

Description

[Technical field]

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

[0002] Patent Document 1 discloses a method for manufacturing a stator provided in a rotating electric machine. The stator is manufactured by clamping multiple segment coils arranged on a stator core with a clamping device and welding the clamped segment coils together. The multiple segment coils are covered with an insulating coating, and ends where the coating has been peeled off are welded together.

[0003] A first segment coil of the plurality of segment coils has a first curved portion that protrudes from the stator core and extends clockwise as viewed from the axial direction of the stator core, and a first end portion that is continuous with the first curved portion and extends in the axial direction of the stator core. The first end portion has a first peeled portion where the coating has been peeled off.

[0004] The second segment coil of the plurality of segment coils has a second curved portion that protrudes from the stator core and extends counterclockwise when viewed from the axial direction of the stator core, and a second end portion that is continuous with the second curved portion and extends in the axial direction of the stator core. The second end portion has a second peeled portion where the coating has been peeled off.

[0005] In the manufacturing method of Patent Document 1, the first peeled portion and the second peeled portion are clamped by an electrode. The clamped first peeled portion and the second peeled portion are electrically connected by TIG (Tungsten Inert Gas) welding. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2018-082543 A Summary of the Invention [Problem to be solved by the invention]

[0007] In Patent Document 1, the first peeled portion and the second peeled portion are electrically connected through TIG welding. In order to perform TIG welding, the first peeled portion and the second peeled portion need to be long enough to be clamped by an electrode. As a result, the stator becomes large, which is undesirable.

[0008] A method of joining the first peeled portion and the second peeled portion by laser welding is conceivable. In such a case, it is not necessary to clamp the first peeled portion and the second peeled portion by an electrode. Therefore, it is possible to shorten the first peeled portion and the second peeled portion compared to the case of TIG welding.

[0009] However, if these peels are short, the heat generated by the laser welding can easily be transferred to the coating near the peel, causing the coating to become hot and potentially damaging. In the above-mentioned stator manufacturing method, heat generated by welding may damage the coating of the segment coil. [Means for solving the problem]

[0010] The means for solving the above problems and their effects will be described below. According to one aspect of the present disclosure, there is provided a clamping device configured to hold a first segment coil and a second segment coil arranged in a stator core, the first segment coil and the second segment coil being covered with an insulating coating, the clamping device being used to join a first peeled portion at a first end of the first segment coil where the coating is peeled off and a second peeled portion at a second end of the second segment coil where the coating is peeled off through laser welding, the clamping device being configured to hold a first segment coil and a second segment coil arranged ... and a second shaft arranged so as to press the first shaft against the second segment coil and press the second shaft against the first segment coil, wherein the first shaft and the second shaft are spaced apart circumferentially of the stator core with a gap therebetween so as to restrict the circumferential positions of the first end and the second end of the stator core with the first shaft pressed against the second segment coil and the second shaft pressed against the first segment coil, and the clamping device is configured to clamp the first end and the second end in a state in which the circumferential positions of the first end and the second end of the stator core are restricted.

[0011] The first segment coil and the second segment coil are clamped in a state in which the second shaft is in contact with the first segment coil and the first shaft is in contact with the second segment coil. In this way, the first peeled portion and the second peeled portion can be laser welded together while the first segment coil and the second segment coil are clamped.

[0012] Since the second shaft is in contact with the first segment coil and the first shaft is in contact with the second segment coil, heat generated by laser welding can be dissipated from the first segment coil and the second segment coil to the first shaft and the second shaft. Therefore, the possibility that heat generated by welding will damage the coating of the first segment coil and the coating of the second segment coil can be reduced.

[0013] The clamping device further includes a first claw extending radially from a middle portion of the first shaft and a second claw extending radially from a middle portion of the second shaft, wherein the first claw and the second claw are spaced apart at a predetermined interval in the radial direction of the stator core, and the predetermined interval may be set so that, when viewed in the axial direction of the stator core, the first end and the second end are clamped by the first claw and the second claw when the first claw and the second claw overlap in the radial direction of the stator core.

[0014] According to the above configuration, the first segment coil and the second segment coil can be positioned in the radial direction of the stator core by using the first claws and the second claws. The clamping device may be configured to hold the first segment coil and the second segment coil by the first claw and the second claw abutting portions of the coating at the first end and the second end.

[0015] The coating at the first end and the coating at the second end abut against the first and second claws. This allows heat generated by laser welding to escape from the first and second claws to the first and second shafts. This further reduces the possibility that heat generated by welding will damage the coating of the first segment coil and the coating of the second segment coil.

[0016] In the above clamp device, the first claw abuts against the first end and the second claw abuts against the second end, thereby holding the first segment coil and the second segment coil, and the thickness of the peripheral portion of the first claw may be thinner than the thickness of the central portion of the first claw, and the thickness of the peripheral portion of the second claw may be thinner than the thickness of the central portion of the second claw.

[0017] Assume that the first shaft and the second shaft are rotated about their respective central axes until the first claw, the first end, the second end, and the second claw overlap in the radial direction of the stator core. The peripheral portion of the first claw abuts against the first end, and then the central portion of the first claw abuts against the first end. The peripheral portion of the second claw abuts against the second end, and then the central portion of the second claw abuts against the second end. According to the above configuration, the first end and the second end can be positioned by gradually moving them in the radial direction of the stator core.

[0018] The first segment coil has a first curved portion protruding from the stator core and extending clockwise as viewed in the axial direction of the stator core, and the first end portion continuing from the first curved portion and extending in the axial direction of the stator core, the second segment coil has a second curved portion protruding from the stator core and extending counterclockwise as viewed in the axial direction of the stator core, and the second end portion continuing from the second curved portion and extending in the axial direction of the stator core, the second segment coil has another second curved portion protruding from the stator core and extending clockwise as viewed in the axial direction of the stator core, and another second end portion continuing from the another second curved portion and extending in the axial direction of the stator core, and the third segment coil has a third curved portion protruding from the stator core and extending counterclockwise as viewed in the axial direction of the stator core, and a third end portion continuing from the third curved portion and extending in the axial direction of the stator core, and is covered with an insulating coating. The clamping device is configured to hold the second segment coil and the third segment coil so as to join the second peeled portion at the other second end from which the coating has been peeled off and the third peeled portion at the third end from which the coating has been peeled off through laser welding, and the first claw is one of two first claws extending in the same radial direction of the first shaft and spaced apart in the axial direction of the first shaft, and the second claw is one of two second claws extending in the same radial direction of the second shaft and spaced apart in the axial direction of the second shaft, and the first end, the second end, the other second end, and the third end may be clamped by the two first claws and the two second claws with the two first claws, the two second claws, the first end, the second end, the other second end, and the third end overlapping in the radial direction of the stator core.

[0019] According to the above configuration, it is possible to simultaneously clamp two locations aligned in the radial direction of the stator core. The first segment coil and the second segment coil constitute a segment coil unit, the segment coil unit being one of two segment coil units arranged circumferentially around the stator core and in which the first peeled portion and the second peeled portion overlap in the radial direction of the stator core, the clamping device comprising a third shaft arranged to extend in the radial direction of the stator core and a third claw extending in the radial direction of the third shaft from a middle portion of the third shaft, the first shaft, the second shaft and the third shaft being arranged in this order in a counterclockwise direction when viewed from the axial direction of the stator core, the second shaft having another second claw, and when the first end and the second end are clamped by the first claw and the second claw in one of the two segment coil units, the first end and the second end are clamped by the other second claw and the third claw in the other of the two segment coil units.

[0020] According to the above configuration, it is possible to simultaneously clamp two locations aligned in the circumferential direction of the stator core. The clamp device may include a first arm fixed to the first shaft and extending in a radial direction of the first shaft, the first arm having a first long hole extending in the extension direction of the first arm, and a first rod connected to the first arm via a first connecting pin slidable in the first long hole so as to be rotatable relative to the first arm, and a second arm fixed to the second shaft and extending in the radial direction of the second shaft, the second arm having a second long hole extending in the extension direction of the second arm, and a second rod connected to the second arm via a second connecting pin slidable in the second long hole so as to be rotatable relative to the second arm.

[0021] By moving the first rod in its axial direction, the first shaft can be rotated around its central axis. By moving the second rod in its axial direction, the second shaft can be rotated around its central axis. That is, the clamping operation can be achieved by moving the rods in the axial direction.

[0022] According to one aspect of the present disclosure, there is provided a method for manufacturing a stator having a first segment coil and a second segment coil covered with an insulating coating and arranged on a stator core, the method including a positioning step of moving a clamping device having a first shaft and a second shaft toward the stator core to press the first shaft against the coating of the second segment coil and to press the second shaft against the coating of the first segment coil to position the first segment coil and the second segment coil in the axial direction of the stator core, and a welding step of joining, after the positioning step, a first peeled-off portion at a first end of the first segment coil from which the coating has been peeled off and a second peeled-off portion at a second end of the second segment coil from which the coating has been peeled off via laser welding.

[0023] Since the first shaft contacts the coating of the second segment coil and the second shaft contacts the coating of the first segment coil, heat generated by laser welding can be dissipated from the first curved portion and the second curved portion to the first shaft and the second shaft. This reduces the possibility that heat generated by welding will damage the coating of the first segment coil and the coating of the second segment coil.

[0024] In the above-mentioned method for manufacturing a stator, the first segment coil has a first curved portion protruding from the stator core and extending clockwise as viewed in the axial direction of the stator core, and the first end portion continuing from the first curved portion and extending in the axial direction of the stator core, the second segment coil has a second curved portion protruding from the stator core and extending counterclockwise as viewed in the axial direction of the stator core, and the second end portion continuing from the second curved portion and extending in the axial direction of the stator core, the clamping device further includes a first claw extending from a middle portion of the first shaft in the radial direction of the first shaft, and a second claw extending from a middle portion of the second shaft in the radial direction of the second shaft, and the positioning step includes clamping the first shaft and the second shaft in the radial direction of the stator core and clamping the first end portion and the second end portion in the radial direction of the stator core. and pressing the first shaft against the second curved portion while sandwiching the first and second ends, thereby regulating positions of the first end and the second end in a circumferential direction of the stator core, the manufacturing method may further include a clamping step of clamping the first end and the second end with the first claw and the second claw by rotating the first shaft and the second shaft about their respective central axes until the first claw, the first end, the second end, and the second claw overlap in a radial direction of the stator core, and in the positioning step, the first shaft and the second shaft may be moved toward the stator core with the first claw facing away from the stator core and the second claw facing toward the stator core.

[0025] Compared to a configuration in which the first and second claws are oriented in a direction perpendicular to the axial direction of the stator core, interference between the first and second claws and the segment coils is less likely to occur, reducing the possibility that the first and second claws will damage the first and second peeling portions. [Brief description of the drawings]

[0026] [Figure 1] 1A and 1B are diagrams illustrating a stator manufactured using a clamping device according to an embodiment. [Diagram 2] 2 is a diagram showing some of the multiple segment coils included in the stator of FIG. 1. FIG. [Diagram 3] FIG. 3 is an enlarged view of FIG. [Figure 4] FIG. [Diagram 5] FIG. 5 shows a portion of the clamping device of FIG. 4 in an unclamped state. [Figure 6] FIG. 5 shows a part of the clamping device of FIG. 4 in a clamped state. [Figure 7] 1 is a schematic diagram showing a plurality of segment coils before being positioned in the axial direction of a stator core. FIG. [Figure 8] 1 is a schematic diagram showing multiple segment coils positioned in the axial direction of a stator core. FIG. [Figure 9] 5 is a top view of a portion of the clamping device of FIG. 4 in an unclamped state. FIG. [Figure 10] FIG. 5 is a top view of a portion of the clamping device of FIG. 4 in a clamped state. [Figure 11] 11 is a cross-sectional view taken along line 11-11 in FIG. 9. [Figure 12] 12 is a cross-sectional view taken along line 12-12 in FIG. 10. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A clamping device according to an embodiment and a method for manufacturing a stator using the clamping device will be described below with reference to the drawings. <Stator 10 manufactured using clamping device 100> A stator 10 manufactured using a clamping device 100 will be described with reference to Figs. 1 to 3. The central axis of the stator core 20 is indicated by a dashed line. In the following, a cylindrical coordinate system is used in which the central axis of the stator core 20 is the z-axis. Hereinafter, the radial r direction shown in Fig. 1 is referred to as the radial direction of the stator core 20. The angle θ direction is referred to as the circumferential direction of the stator core 20. The axis z direction is referred to as the axial direction of the stator core 20. In addition, when the stator core 20 is viewed from above toward the negative direction of the axis z, the two directions along the circumferential direction are referred to as the clockwise direction as viewed from the axial direction and the counterclockwise direction as viewed from the axial direction, respectively. That is, the counterclockwise direction as viewed from the axial direction is the positive direction in the angle θ direction, and the clockwise direction as viewed from the axial direction is the negative direction in the angle θ direction.

[0028] As shown in FIG. 1, the stator 10 includes a cylindrical stator core 20 and a plurality of segment coils 30 housed in the stator core 20 . The stator core 20 has a plurality of slots 20a arranged at predetermined intervals in the circumferential direction of the stator core 20, and each of the plurality of slots 20a extends in the radial direction of the stator core 20. Each of the plurality of segment coils 30 is arranged in two of the plurality of slots 20a.

[0029] FIG. 2 shows some of the multiple segment coils 30 included in the stator 10 of FIG. 1. FIG. 2 shows only the multiple segment coils 30 arranged on the stator core 20, without showing the stator core 20. The multiple segment coils 30 include a first segment coil 32, a second segment coil 34, a third segment coil 36, and a fourth segment coil 38. As shown in FIG. 2, the first segment coil 32, the second segment coil 34, the third segment coil 36, and the fourth segment coil 38 are arranged in this order in the radial direction of the stator core 20. The first segment coil 32 is located at the innermost radial position, and the fourth segment coil 38 is located at the outermost radial position.

[0030] The first segment coil 32 has a first protruding portion 32A that protrudes upward from the slot 20a and extends clockwise as viewed from the axial direction of the stator core 20. The first segment coil 32 has a first straight portion 32B that is continuous with the first protruding portion 32A and extends in the axial direction of the stator core 20 in the slot 20a. The first segment coil 32 has a first connecting portion 32C that is continuous with the first straight portion 32B, protrudes downward from the slot 20a, and extends counterclockwise as viewed from the axial direction of the stator core 20. The first segment coil 32 has a first straight portion 32D that is continuous with the first connecting portion 32C and extends in the axial direction of the stator core 20 in the slot 20a. The first segment coil 32 has a first protruding portion 32E that is continuous with the first straight portion 32D, protrudes from the slot 20a, and extends clockwise as viewed from the axial direction of the stator core 20.

[0031] The second segment coil 34 has a second protruding portion 34A that protrudes upward from the slot 20a and extends counterclockwise when viewed from the axial direction of the stator core 20. The second segment coil 34 has a second straight portion 34B that is continuous with the second protruding portion 34A and extends in the axial direction of the stator core 20 in the slot 20a. The second segment coil 34 has a second connecting portion 34C that is continuous with the second straight portion 34B, protrudes downward from the slot 20a, and extends counterclockwise when viewed from the axial direction of the stator core 20. The second segment coil 34 has a second straight portion 34D that is continuous with the second connecting portion 34C and extends in the axial direction of the stator core 20 in the slot 20a. The second segment coil 34 has a second protruding portion 34E that is continuous with the second straight portion 34D, protrudes from the slot 20a, and extends clockwise when viewed in the axial direction of the stator core 20.

[0032] The third segment coil 36 has a third protruding portion 36A that protrudes upward from the slot 20a and extends counterclockwise when viewed from the axial direction of the stator core 20. The third segment coil 36 has a third straight portion 36B that is continuous with the third protruding portion 36A and extends in the axial direction of the stator core 20 in the slot 20a. The third segment coil 36 has a third connecting portion 36C that is continuous with the third straight portion 36B, protrudes downward from the slot 20a, and extends counterclockwise when viewed from the axial direction of the stator core 20. The third segment coil 36 has a third straight portion 36D that is continuous with the third connecting portion 36C and extends in the axial direction of the stator core 20 in the slot 20a. The third segment coil 36 has a third protruding portion 36E that is continuous with the third straight portion 36D, protrudes from the slot 20a, and extends clockwise when viewed in the axial direction of the stator core 20.

[0033] The fourth segment coil 38 has a fourth protruding portion 38A that protrudes upward from the slot 20a and extends counterclockwise when viewed from the axial direction of the stator core 20. The fourth segment coil 38 has a fourth straight portion 38B that is continuous with the fourth protruding portion 38A and extends in the axial direction of the stator core 20 in the slot 20a. The fourth segment coil 38 has a fourth connecting portion 38C that is continuous with the fourth straight portion 38B, protrudes downward from the slot 20a, and extends counterclockwise when viewed from the axial direction of the stator core 20. The fourth segment coil 38 has a fourth straight portion 38D that is continuous with the fourth connecting portion 38C and extends in the axial direction of the stator core 20 in the slot 20a. The fourth segment coil 38 has a fourth protruding portion 38E that is continuous with the fourth straight portion 38D, protrudes from the slot 20a, and extends counterclockwise when viewed in the axial direction of the stator core 20.

[0034] As shown in Figs. 1 to 3, the first segment coil 32 has a first curved portion 32a that protrudes from the stator core 20 and extends clockwise when viewed from the axial direction of the stator core 20, and a first end portion 32b that is continuous with the first curved portion 32a and extends in the axial direction of the stator core 20. The first curved portion 32a and the first end portion 32b form a first protruding portion 32E. The first segment coil 32 is covered with an insulating coating. The first end portion 32b has a first peeled portion where the coating has been peeled off.

[0035] The second segment coil 34 has a second curved portion 34a that protrudes from the stator core 20 and extends counterclockwise when viewed from the axial direction of the stator core 20, and a second end portion 34b that is continuous with the second curved portion 34a and extends in the axial direction of the stator core 20. The second curved portion 34a and the second end portion 34b form a second protruding portion 34A. The second segment coil 34 is covered with an insulating coating. The second end portion 34b has a second peeling portion where the coating is peeled off. The second segment coil 34 has a second curved portion 34c that protrudes from the stator core 20 and extends clockwise when viewed from the axial direction of the stator core 20, and a second end portion 34d that is continuous with the second curved portion 34c and extends in the axial direction of the stator core 20. The second curved portion 34c and the second end portion 34d form a second protruding portion 34E. The second end 34d has a second peeled portion where the coating has been peeled off.

[0036] The third segment coil 36 has a third curved portion 36a that protrudes from the stator core 20 and extends counterclockwise when viewed from the axial direction of the stator core 20, and a third end portion 36b that is continuous with the third curved portion 36a and extends in the axial direction of the stator core 20. The third curved portion 36a and the third end portion 36b form a third protruding portion 36A. The third segment coil 36 is covered with an insulating coating. The third end portion 36b has a third peeling portion where the coating is peeled off. The third segment coil 36 has a third curved portion 36c that protrudes from the stator core 20 and extends clockwise when viewed from the axial direction of the stator core 20, and a third end portion 36d that is continuous with the third curved portion 36c and extends in the axial direction of the stator core 20. The third curved portion 36c and the third end portion 36d form a third protruding portion 36E. The third end 36d has a third peeled portion where the coating has been peeled off.

[0037] The fourth segment coil 38 has a fourth curved portion 38a that protrudes from the stator core 20 and extends counterclockwise when viewed from the axial direction of the stator core 20, and a fourth end portion 38b that is continuous with the fourth curved portion 38a and extends in the axial direction of the stator core 20. The fourth curved portion 38a and the fourth end portion 38b form a fourth protruding portion 38A. The fourth segment coil 38 is covered with an insulating coating. The fourth end portion 38b has a fourth peeled portion where the coating has been peeled off.

[0038] The first curved portion 32a, the second curved portion 34c, and the third curved portion 36c protrude from the same slot 20a. The first curved portion 32a, the second curved portion 34c, and the third curved portion 36c are aligned in this order in the radial direction of the stator core 20.

[0039] The second curved portion 34a, the third curved portion 36a, and the fourth curved portion 38a protrude from the same slot 20a. The second curved portion 34a, the third curved portion 36a, and the fourth curved portion 38a are aligned in this order in the radial direction of the stator core 20.

[0040] The first end 32b, the second end 34b, 34d, the third end 36b, 36d, and the fourth end 38b are arranged in a radial direction of the stator core 20 and form a group consisting of a plurality of end portions. As shown in FIG. 1, a plurality of groups, each consisting of a plurality of end portions, are arranged in a circumferential direction of the stator core 20 at equal intervals.

[0041] <Outline of clamp device 100> As shown in Fig. 4, the clamp device 100 includes a support plate 50 having an opening 50a. The opening 50a of the support plate 50 has a shape in which an inner arc and an outer arc are connected by two lines that are substantially perpendicular to the inner arc. The inner arc and the outer arc are concentric and have the same central angle.

[0042] The clamp device 100 includes an arc wall 52 extending from the support plate 50 perpendicularly to the support plate 50. The arc wall 52 extends along the inner arc of the opening 50a. In other words, the arc wall 52 is curved in an arc shape. The arc wall 52 has a plurality of support holes 52a that respectively support a plurality of shafts 58 described below. The plurality of support holes 52a are aligned in a row.

[0043] The clamp device 100 includes a plurality of pillars 54 extending perpendicularly from the support plate 50. The arc wall 52 and the plurality of pillars 54 extend in the same direction. The plurality of pillars 54 are aligned along the outer arc of the opening 50a. Each of the plurality of pillars 54 has a support pin 56 that supports a corresponding shaft 58, which will be described later. When the support plate 50 is placed horizontally, the plurality of support holes 52a and the plurality of support pins 56 are at the same height.

[0044] The clamp device 100 includes a plurality of shafts 58. Each of the plurality of shafts 58 is rotatably supported by a corresponding support hole 52a and a corresponding support pin 56. In detail, the shaft 58, an arm 62 described below, and the support pin 56 are arranged in this order, and the support pin 56 supports the shaft 58 via the arm 62. Each of the plurality of shafts 58 extends in a radial direction with respect to the center of the circle of the inner arc of the opening 50a. The plurality of shafts 58 are arranged at equal intervals along the inner arc of the opening 50a. Each of the plurality of shafts 58 has a plurality of claws 60. The plurality of shafts 58 and the plurality of claws 60 will be described in detail later.

[0045] The clamp device 100 includes a plurality of arms 62 fixed to a plurality of shafts 58, respectively. Each of the plurality of arms 62 extends in a radial direction of the corresponding shaft 58. A long hole is provided in the arm 62, extending in the extension direction of the arm 62. A rod 66 is connected to the arm 62 so as to be rotatable relative to the arm 62 via a connecting pin 64 that is slidable in the long hole. The rod 66 extends through a hole provided in the support plate 50. When the support plate 50 is disposed horizontally, the rod 66 extends in the vertical direction. By moving the rod 66 in the vertical direction, the shaft 58 can be rotated around the central axis of the shaft 58.

[0046] <Multiple Shafts 58 and Multiple Claws 60 of the Clamp Device 100> Fig. 5 shows two adjacent shafts 58 of the multiple shafts 58 shown in Fig. 4. These two shafts 58 are hereinafter referred to as a first shaft 58A and a second shaft 58B, respectively. Fig. 6 shows a state in which the first shaft 58A and the second shaft 58B shown in Fig. 5 are rotated about their respective central axes. Note that the state in which the first shaft 58A and the second shaft 58B are rotated to the position shown in Fig. 6 is referred to as a clamped state.

[0047] For each of the multiple claws 60, the thickness of the peripheral portion of the claw 60 is thinner than the thickness of the central portion of the claw 60. The multiple claws 60 provided on the first shaft 58A will be referred to as multiple first claws 60a, 60b, 60c, 60d, 60e, 60f (60a to 60f) below. The multiple claws 60 provided on the second shaft 58B will be referred to as multiple second claws 60a, 60b, 60c, 60d, 60e, 60f (60a to 60f) below.

[0048] A plurality of first claws 60a-60f extend from the middle of the first shaft 58A in the radial direction of the first shaft 58A. The tip of the first shaft 58A supported by the support hole 52a, the plurality of first claws 60a-60f, and the base end of the first shaft 58A supported by the support pin 56 are arranged in this order. The first claws 60a, 60c, and 60e extend in the same radial direction of the first shaft 58A and are spaced apart in the axial direction of the first shaft 58A. The first claws 60b, 60d, and 60f extend in the same radial direction of the first shaft 58A and are spaced apart in the axial direction of the first shaft 58A.

[0049] A plurality of second claws 60a-60f extend from the middle of the second shaft 58B in the radial direction of the second shaft 58B. The tip of the second shaft 58B supported in the support hole 52a, the plurality of second claws 60a-60f, and the base end of the second shaft 58B supported by the support pin 56 are arranged in this order. The second claws 60a, 60c, and 60e extend in the same radial direction of the second shaft 58B and are spaced apart in the axial direction of the second shaft 58B. The second claws 60b, 60d, and 60f extend in the same radial direction of the second shaft 58B and are spaced apart in the axial direction of the second shaft 58B.

[0050] 6, the first claw 60a, the second claw 60b, the first claw 60c, the second claw 60d, the first claw 60e, and the second claw 60f are arranged in this order. The second claw 60b and the first claw 60c are adjacent to each other, and the second claw 60d and the first claw 60e are adjacent to each other.

[0051] <Operation of the clamp device 100 and manufacturing method of the stator 10> The operation of the clamp device 100 will now be described. The clamp device 100 is disposed above the stator core 20 shown in Fig. 1. Fig. 7 shows such a state diagrammatically.

[0052] First, from the state shown in FIG. 7, clamp device 100 is brought close to stator core 20 so that each of a plurality of groups, each of which is made up of a plurality of end portions, is sandwiched between two adjacent shafts 58.

[0053] As shown in FIG. 8, the multiple shafts 58 are pressed against the multiple segment coils 30. By pressing the multiple shafts 58 against the multiple segment coils 30, the multiple segment coils 30 are positioned in the axial direction of the stator core 20. At the same time as positioning the multiple segment coils 30 in the axial direction of the stator core 20, the multiple segment coils 30 are also positioned in the circumferential direction of the stator core 20. The multiple segment coils 30 positioned by the first shaft 58A and the second shaft 58B will be described below. The multiple shafts 58 have the same shape. The multiple shafts 58 are arranged at equal intervals along the inner arc of the opening 50a. Then, in the manufactured stator 10, multiple groups, each consisting of multiple end portions, are arranged at equal intervals in the circumferential direction of the stator core 20. Multiple segment coil units are arranged in the circumferential direction of the stator core 20, and one group consisting of multiple end portions belongs to one segment coil unit. For example, the first segment coil 32, the second segment coil 34, the third segment coil 36, and the fourth segment coil 38 constitute one segment coil unit. Therefore, any two adjacent ones of the multiple shafts 58 can perform the clamping operation in the same manner as the first shaft 58A and the second shaft 58B. Here, the clamping operation will be briefly described. The first end 32b and the second end 34b are clamped by the first claw 60a and the second claw 60b. The second end 34d and the third end 36b are clamped by the first claw 60c and the second claw 60d. The third end 36d and the fourth end 38b are clamped by the first claw 60e and the second claw 60f. The clamping operation will be described in detail later.

[0054] FIG. 7 is a schematic diagram showing the first segment coil 32 and the second segment coil 34 before being positioned in the axial direction of the stator core 20. FIG. 8 is a schematic diagram showing the first segment coil 32 and the second segment coil 34 after being positioned in the axial direction of the stator core 20. The first segment coil 32 before being positioned in the axial direction of the stator core 20 is farther away from the stator core 20 than the first segment coil 32 after being positioned in the axial direction of the stator core 20. The second segment coil 34 before being positioned in the axial direction of the stator core 20 is farther away from the stator core 20 than the second segment coil 34 after being positioned in the axial direction of the stator core 20. The third segment coil 36 before being positioned in the axial direction of the stator core 20 is farther away from the stator core 20 than the third segment coil 36 after being positioned in the axial direction of the stator core 20. The fourth segment coil 38 before being positioned in the axial direction of the stator core 20 is farther away from the stator core 20 than the fourth segment coil 38 after being positioned in the axial direction of the stator core 20.

[0055] The first shaft 58A and the second shaft 58B are moved toward the stator core 20 so that the first end 32b, the second end 34b, 34d, the third end 36b, 36d, and the fourth end 38b are sandwiched between the first shaft 58A and the second shaft 58B. As a result, the first shaft 58A is pressed against the second curved portion 34a, the third curved portion 36a, and the fourth curved portion 38a, and the second shaft 58B is pressed against the first curved portion 32a, the second curved portion 34c, and the third curved portion 36c. As a result, the first segment coil 32, the second segment coil 34, the third segment coil 36, and the fourth segment coil 38 are positioned in the axial direction of the stator core 20. 5 and 11, in the positioning step, the first claws 60a, 60c, 60e and the second claws 60a, 60c, 60e face away from the stator core 20. Also, the first claws 60b, 60d, 60f and the second claws 60b, 60d, 60f face toward the stator core 20. In the positioning step, with the multiple claws 60 oriented in this manner, the first shaft 58A and the second shaft 58B are moved toward the stator core 20.

[0056] The first shaft 58A and the second shaft 58B are spaced apart from each other in the circumferential direction of the stator core 20 so as to sandwich the first end 32b, the second end 34b, 34d, the third end 36b, 36d, and the fourth end 38b. Therefore, the first shaft 58A and the second shaft 58B can regulate the positions of the first end 32b, the second end 34b, 34d, the third end 36b, 36d, and the fourth end 38b in the circumferential direction of the stator core 20.

[0057] 8 and 9 show a state in which a plurality of segment coils 30 are positioned in the axial direction of the stator core 20. As shown in Fig. 9, a first shaft 58A and a second shaft 58B are disposed so as to extend in the radial direction of the stator core 20.

[0058] Next, the multiple shafts 58 are rotated from the state shown in FIG. 9 and FIG. 11 to the state shown in FIG. 10 and FIG. 12. As described above, the multiple rods 66 are moved in the vertical direction to rotate the multiple shafts 58. In detail, the first shaft 58A and the second shaft 58B are rotated around their respective central axes to the state shown in FIG. 10 and FIG. 12, with the multiple segment coils 30 positioned in the axial direction of the stator core 20. As shown in FIG. 10, the first claw 60a, the first end 32b, the second end 34b, the second claw 60b, the first claw 60c, the second end 34d, the third end 36b, the second claw 60d, the first claw 60e, the third end 36d, the fourth end 38b, and the second claw 60f are aligned. As shown in FIG. 10, these elements overlap in this order in the radial direction of the stator core 20.

[0059] The first claws 60a and the second claws 60b are spaced apart by a predetermined interval in the radial direction of the stator core 20, and the predetermined interval is set so that the first end 32b and the second end 34b are clamped by the first claws 60a and the second claws 60b. The first claws 60a abut against the first end 32b, and the second claws 60b abut against the second end 34b.

[0060] The first claw 60c and the second claw 60d are spaced apart by a predetermined interval in the radial direction of the stator core 20, and the predetermined interval is set so that the second end 34d and the third end 36b are clamped by the first claw 60c and the second claw 60d. That is, the first claw 60c abuts against the second end 34d and the second claw 60d abuts against the third end 36b.

[0061] The first claw 60e and the second claw 60f are spaced apart by a predetermined interval in the radial direction of the stator core 20, and the predetermined interval is set so that the third end 36d and the fourth end 38b are clamped by the first claw 60e and the second claw 60f. That is, the first claw 60e abuts against the third end 36d, and the second claw 60f abuts against the fourth end 38b.

[0062] In this way, the clamp device 100 holds the first segment coil 32 and the second segment coil 34 so that the first peeled portion at the first end 32b where the coating is peeled off and the second peeled portion at the second end 34b where the coating is peeled off are joined through laser welding. The clamp device 100 also holds the second segment coil 34 and the third segment coil 36 so that the second peeled portion at the second end 34d where the coating is peeled off and the third peeled portion at the third end 36b where the coating is peeled off are joined through laser welding. The clamp device 100 also holds the third segment coil 36 and the fourth segment coil 38 so that the third peeled portion at the third end 36d where the coating is peeled off and the fourth peeled portion at the fourth end 38b where the coating is peeled off are joined through laser welding.

[0063] In this manner, in the manufacturing method of the stator 10, a clamping step is performed on the stator 10 in which the segment coils 30 are attached to the stator core 20 and the segment coils 30 are bent to arrange the ends of the stator 10 in groups. That is, the clamping device 100 is attached to the stator 10 in which the ends of the stator 10 are arranged in groups, and the stator 10 is pressed against and rotated to clamp. In the manufacturing method of the stator 10, the clamping step is performed by the clamping device 100 in this manner.

[0064] Next, the welding process is performed while the clamped position is maintained. That is, the welding process is performed while the first shaft 58A is pressed against the second curved portion 34a, the third curved portion 36a, and the fourth curved portion 38a, and the second shaft 58B is pressed against the first curved portion 32a, the second curved portion 34c, and the third curved portion 36c. In the welding process, the first peeled portion where the coating is peeled off at the first end 32b clamped by the first claw 60a and the second claw 60b and the second peeled portion where the coating is peeled off at the second end 34b are joined by laser welding. The first shaft 58A and the second shaft 58B are rotated around their respective central axes to clamp the first end 32b and the second end 34b. 10 and 12, when the first end 32b and the second end 34b are clamped, the first claw 60a and the second claw 60b abut against the portions of the coating at the first end 32b and the second end 34b. With the first claw 60a and the second claw 60b abutting against the portions of the coating at the first end 32b and the second end 34b, the first peeled portion where the coating has been peeled off at the first end 32b and the second peeled portion where the coating has been peeled off at the second end 34b are joined by laser welding.

[0065] In the welding process, the second peeled portion at the second end 34d, where the coating is removed and clamped by the first jaw 60c and the second jaw 60d, is joined by laser welding to the third peeled portion at the third end 36b, where the coating is removed. When the first shaft 58A and the second shaft 58B are rotated about their respective central axes to clamp the second end 34d and the third end 36b, the first jaw 60c and the second jaw 60d are in contact with the coating portions at the second end 34d and the third end 36b. With the first jaw 60c and the second jaw 60d in contact with the coating portions at the second end 34d and the third end 36b, the second peeled portion at the second end 34d, where the coating is removed, is joined by laser welding to the third peeled portion at the third end 36b, where the coating is removed.

[0066] In the welding process, the third peeled portion at the third end 36d, where the coating is removed and clamped by the first jaw 60e and the second jaw 60f, is joined by laser welding to the fourth peeled portion at the fourth end 38b, where the coating is removed. When the first shaft 58A and the second shaft 58B are rotated about their respective central axes to clamp the third end 36d and the fourth end 38b, the first jaw 60e and the second jaw 60f abut against the coating portions at the third end 36d and the fourth end 38b. With the first jaw 60e and the second jaw 60f abutting against the coating portions at the third end 36d and the fourth end 38b, the third peeled portion at the third end 36d, where the coating is removed, is joined by laser welding to the fourth peeled portion at the fourth end 38b, where the coating is removed.

[0067] In the same manner, all other points clamped by the clamp device 100 are laser welded. When the laser welding of all the portions clamped by the clamp device 100 is completed, the clamp device 100 performs an unclamping operation. That is, the clamp device 100 rotates the multiple shafts 58 from the state shown in Figures 10 and 12 to the state shown in Figures 9 and 11.

[0068] Next, the clamping device 100 is moved to the next location, and the clamping process and the welding process are performed in the same manner. This process is repeated until welding is completed at all of the locations of the stator core 20 that require welding. This allows all of the multiple segment coils 30 in the stator core 20 to be electrically connected.

[0069] <Effects of this embodiment> (1) The second shaft 58B contacts the first curved portion 32a, the second curved portion 34c, and the third curved portion 36c, and the first shaft 58A contacts the second curved portion 34a, the third curved portion 36a, and the fourth curved portion 38a. In this contact state, the first segment coil 32, the second segment coil 34, the third segment coil 36, and the fourth segment coil 38 are clamped.

[0070] In this way, with the first segment coil 32, the second segment coil 34, the third segment coil 36, and the fourth segment coil 38 clamped, the peeled portions can be laser welded together.

[0071] The second shaft 58B contacts the first curved portion 32a, the second curved portion 34c, and the third curved portion 36c, and the first shaft 58A contacts the second curved portion 34a, the third curved portion 36a, and the fourth curved portion 38a. Therefore, heat generated by laser welding can be dissipated from the first curved portion 32a, the second curved portions 34a, 34c, the third curved portions 36a, 36c, and the fourth curved portion 38a to the first shaft 58A and the second shaft 58B. Therefore, the possibility that heat generated by welding will damage the coating of the first segment coil 32, the coating of the second segment coil 34, the coating of the third segment coil 36, and the coating of the fourth segment coil 38 can be reduced.

[0072] (2) The first segment coil 32, the second segment coil 34, the third segment coil 36, and the fourth segment coil 38 can be positioned in the radial direction of the stator core 20 using the first claws 60a, 60c, 60e and the second claws 60b, 60d, 60f.

[0073] (3) The coating at the first end 32b and the coating at the second end 34b are clamped by the first claw 60a and the second claw 60b. The coating at the second end 34d and the coating at the third end 36b are clamped by the first claw 60c and the second claw 60d. The coating at the third end 36d and the coating at the fourth end 38b are clamped by the first claw 60e and the second claw 60f. Therefore, the heat generated by the laser welding can be dissipated from the first claws 60a, 60c, 60e and the second claws 60b, 60d, 60f to the first shaft 58A and the second shaft 58B. Therefore, the possibility that the heat generated by the welding will damage the coating of the first segment coil 32, the coating of the second segment coil 34, the coating of the third segment coil 36, and the coating of the fourth segment coil 38 can be further reduced.

[0074] (4) In the above clamping process, the first shaft 58A and the second shaft 58B are rotated around their respective central axes until the first claw 60a, the first end 32b, the second end 34b, and the second claw 60b overlap in the radial direction of the stator core 20. Therefore, the periphery of the first claw 60a abuts against the first end 32b, and then the center of the first claw 60a abuts against the first end 32b. Also, the periphery of the second claw 60b abuts against the second end 34b, and then the center of the second claw 60b abuts against the second end 34b. The first end 32b and the second end 34b can be positioned by gradually moving them in the radial direction of the stator core 20. This is particularly effective in a configuration in which multiple locations are clamped simultaneously as in the above embodiment. That is, many segment coils 30 move little by little all at once and their positions are gradually adjusted, so that many segment coils 30 as a whole are easily aligned in a well-balanced manner.

[0075] (5) A plurality of radially aligned locations of the stator core 20 can be clamped simultaneously. (6) A plurality of locations aligned in the circumferential direction of the stator core 20 can be clamped simultaneously.

[0076] (7) By moving the rod 66 in the axial direction of the rod 66, it is possible to rotate the shaft 58 about the central axis of the shaft 58. In other words, by moving the rod 66 in the axial direction, it is possible to realize a clamping operation.

[0077] (8) In the positioning step, the clamping device 100 is brought closer to the stator core 20 so that the multiple ends are sandwiched between the multiple shafts 58. In the positioning step, as shown in Figs. 5 and 11, the first claws 60b, 60d, 60f and the second claws 60b, 60d, 60f face downward, and the first claws 60a, 60c, 60e and the second claws 60a, 60c, 60e face upward. Fig. 12 shows a state in which the first claws 60a to 60f and the second claws 60a to 60f face in a direction perpendicular to the axial direction of the stator core 20. In the positioning step, interference between the first claws 60a to 60f and the second claws 60a to 60f and the multiple segment coils 30 is less likely to occur compared to the case in which the clamping device 100 is brought closer to the stator core 20 in the state shown in Fig. 12. As a result, the possibility that the first claws 60a-60f and the second claws 60a-60f will damage the multiple peeled portions is reduced.

[0078] This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction. In the above embodiment, the clamp device 100 has a plurality of shafts 58. The number of the plurality of shafts 58 can be changed as appropriate. The number of the shafts 58 may be two or more.

[0079] A plurality of shafts 58 may be arranged in a circle around the entire circumference of the stator core 20 so that all ends can be clamped in a single clamping process. In the above embodiment, the first end portion 32b, the second end portions 34b and 34d, the third end portions 36b and 36d, and the fourth end portion 38b are arranged in the radial direction of the stator core 20 to form a group of six end portions. However, this is merely an example. The number of end portions constituting one group can be changed as appropriate.

[0080] In the above embodiment, each of the shafts 58 has a plurality of claws 60. The number of the claws 60 can be changed as appropriate. For example, a configuration in which the first shaft 58A has only the first claw 60a and the second shaft 58B has only the second claw 60b is also possible.

[0081] In the above embodiment, the first shaft 58A and the second shaft 58B are rotated around their respective central axes to clamp the first end 32b and the second end 34b. When the first end 32b and the second end 34b are clamped, the first claw 60a and the second claw 60b abut against the coating portions of the first end 32b and the second end 34b. For example, the first claw 60a and the second claw 60b may abut only against the coating-free portions of the first end 32b and the second end 34b. Similarly, the first claw 60c and the second claw 60d may abut only against the coating-free portions of the second end 34d and the third end 36b. The first claw 60e and the second claw 60f may abut only against the coating-free portions of the third end 36d and the fourth end 38b.

[0082] In the above embodiment, the thickness of the peripheral portion of each of the multiple claws 60 is thinner than the thickness of the central portion of the claw 60. Alternatively, the thickness of the peripheral portion of the claw 60 may be the same as the thickness of the central portion of the claw 60. The thickness of a portion of the peripheral portion of the claw 60 may be thinner than the thickness of the central portion of the claw 60. The thickness of the claw 60 may change continuously or in a step-like manner.

[0083] In the above embodiment, the left side of the second claw 60b in FIG. 11 comes into contact with the second end 34b before the right side of the second claw 60b. In the above embodiment, the thickness of the peripheral portion of the second claw 60b is thinner than the thickness of the central portion of the second claw 60b. Alternatively, the left side of the second claw 60b in FIG. 11 may be thinner than the right side of the second claw 60b. That is, the leading side of the claw 60 may be thinner than the trailing side of the claw 60. The leading side of the claw 60 refers to the portion of the claw 60 that approaches the end first, and the trailing side of the claw 60 refers to the portion that approaches the end last.

[0084] In the above embodiment shown in Figs. 1 to 3, the first segment coil 32 has a first curved portion 32a that protrudes from the stator core 20 and extends clockwise when viewed from the axial direction of the stator core 20. Alternatively, the first segment coil 32 may have a first curved portion 32a that protrudes from the stator core 20 and extends counterclockwise when viewed from the axial direction of the stator core 20 when viewed from above the stator core 20. In this case, the second curved portion 34c and the third curved portion 36c protrude from the stator core 20 and extend counterclockwise when viewed from the axial direction of the stator core 20 when viewed from above the stator core 20. The second curved portion 34a, the third curved portion 36a, and the fourth curved portion 38a protrude from the stator core 20 and extend clockwise when viewed from the axial direction of the stator core 20 when viewed from above the stator core 20. [Explanation of symbols]

[0085] 10...Stator 20…Stator core 32…First segment coil 32a…First curved section 32b...first end 34…Second segment coil 34a…Second curved section 34b…Second end 34c…Second curved section 34d…Second end 36…Third segment coil 36a…Third curved section 36b...Third end 36c…Third curve 36d...Third end 58A…First shaft 58B…Second shaft 60a~60f…First claw 60a~60f...Second claw 100...Clamp device

Claims

1. A clamping device configured to hold a first segment coil and a second segment coil arranged on a stator core, the first segment coil and the second segment coil being covered with an insulating coating, the clamping device being used to join a first peeled-off portion at a first end of the first segment coil where the coating is peeled off and a second peeled-off portion at a second end of the second segment coil where the coating is peeled off through laser welding, The clamping device comprises: A first shaft disposed to extend in a radial direction of the stator core; A second shaft arranged to extend in a radial direction of the stator core; Equipped with the first shaft and the second shaft are spaced apart from each other in the circumferential direction of the stator core with a gap therebetween so as to restrict the positions of the first end and the second end in the circumferential direction of the stator core with the first shaft pressed against the second segment coil and the second shaft pressed against the first segment coil, a clamping mechanism configured to clamp the first end and the second end in a state in which positions of the first end and the second end in a circumferential direction of the stator core are restricted, a first claw extending from a middle portion of the first shaft in a radial direction of the first shaft; a second claw extending in a radial direction of the second shaft from a middle portion of the second shaft; Further equipped with The first claw and the second claw are spaced apart at a predetermined interval in a radial direction of the stator core, The predetermined interval is set so that the first end portion and the second end portion are clamped by the first claw and the second claw in a state where the first claw and the second claw overlap in a radial direction of the stator core, as viewed in an axial direction of the stator core. Clamping device.

2. The first claw and the second claw are configured to hold the first segment coil and the second segment coil by abutting against portions of the coating at the first end and the second end. The clamping device of claim 1 .

3. The first claw is configured to abut against the first end portion and the second claw is configured to abut against the second end portion, thereby holding the first segment coil and the second segment coil, The thickness of the peripheral portion of the first claw is thinner than the thickness of the central portion of the first claw, and the thickness of the peripheral portion of the second claw is thinner than the thickness of the central portion of the second claw.

3. The clamping device according to claim 1 or 2.

4. the first segment coil has a first curved portion protruding from the stator core and extending clockwise as viewed in the axial direction of the stator core, and the first end portion continuing from the first curved portion and extending in the axial direction of the stator core, The second segment coil has a second curved portion protruding from the stator core and extending counterclockwise as viewed in the axial direction of the stator core, and the second end portion continuing from the second curved portion and extending in the axial direction of the stator core, the second segment coil has another second curved portion protruding from the stator core and extending clockwise as viewed from the axial direction of the stator core, and another second end portion continuing from the another second curved portion and extending in the axial direction of the stator core, the third segment coil has a third curved portion protruding from the stator core and extending counterclockwise as viewed in the axial direction of the stator core, and a third end portion continuing to the third curved portion and extending in the axial direction of the stator core, and is covered with an insulating coating; The clamp device is configured to hold the second segment coil and the third segment coil so as to join the second peeled portion at the second end where the coating is peeled off and the third peeled portion at the third end where the coating is peeled off through laser welding; The first claw is one of two first claws extending in the same radial direction of the first shaft and spaced apart in the axial direction of the first shaft, the second claw is one of two second claws extending in the same radial direction of the second shaft and spaced apart in the axial direction of the second shaft; the first end, the second end, the other second end, and the third end are clamped by the two first claws and the two second claws in a state in which the two first claws, the two second claws, the first end, the second end, the other second end, and the third end overlap in a radial direction of the stator core; 3. The clamping device according to claim 1 or 2.

5. the first segment coil and the second segment coil constitute a segment coil unit, the segment coil unit being one of two segment coil units arranged in a circumferential direction of the stator core and in which the first peeled portion and the second peeled portion overlap in a radial direction of the stator core; The clamping device comprises: A third shaft arranged to extend in a radial direction of the stator core; a third claw extending in a radial direction of the third shaft from a middle portion of the third shaft; Equipped with the first shaft, the second shaft, and the third shaft are arranged in this order in a counterclockwise direction as viewed in the axial direction of the stator core, The second shaft has a second prong. When the first end and the second end are clamped by the first claw and the second claw in one of the two segment coil units, the first end and the second end are clamped by the other second claw and the third claw in the other of the two segment coil units.

3. The clamping device according to claim 1 or 2.

6. a first arm fixed to the first shaft and extending in a radial direction of the first shaft, the first arm having a first long hole extending in an extension direction of the first arm; a first rod connected to the first arm via a first connecting pin that is slidable in the first long hole so as to be rotatable relative to the first arm; a second arm fixed to the second shaft and extending in a radial direction of the second shaft, the second arm having a second slot extending in an extension direction of the second arm; a second rod connected to the second arm via a second connecting pin slidable in the second long hole so as to be rotatable relative to the second arm; 3. The clamping device according to claim 1 or 2.

7. A method for manufacturing a stator having a first segment coil and a second segment coil covered with an insulating coating and disposed in a stator core, comprising the steps of: The manufacturing method includes a positioning step of moving a clamping device having a first shaft and a second shaft toward the stator core to press the first shaft against the coating of the second segment coil and press the second shaft against the coating of the first segment coil to position the first segment coil and the second segment coil in the axial direction of the stator core; and a welding process for joining, by laser welding, a first peeled portion at a first end of the first segment coil from which the coating has been peeled off and a second peeled portion at a second end of the second segment coil from which the coating has been peeled off, after the positioning process. the first segment coil has a first curved portion protruding from the stator core and extending clockwise as viewed in the axial direction of the stator core, and the first end portion continuing from the first curved portion and extending in the axial direction of the stator core, The second segment coil has a second curved portion protruding from the stator core and extending counterclockwise as viewed in the axial direction of the stator core, and the second end portion continuing from the second curved portion and extending in the axial direction of the stator core, The clamp device further includes a first claw extending from a middle portion of the first shaft in a radial direction of the first shaft, and a second claw extending from a middle portion of the second shaft in a radial direction of the second shaft, the positioning step includes, in a state in which the first shaft and the second shaft extend in a radial direction of the stator core and sandwich the first end and the second end, pressing the first shaft against the second curved portion and pressing the second shaft against the first curved portion to restrict positions of the first end and the second end in the circumferential direction of the stator core, The manufacturing method further includes a clamping step of clamping the first end and the second end by the first claw and the second claw by rotating the first shaft and the second shaft about their respective central axes until the first claw, the first end, the second end, and the second claw overlap in a radial direction of the stator core, In the positioning step, moving the first shaft and the second shaft toward the stator core while the first claw faces away from the stator core and the second claw faces toward the stator core; A method for manufacturing a stator.

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