Bending method for segment coil and bending device for segment coil

Abstract

To provide a bending method capable of easily preventing an insulation coating of a segment coil from being damaged.SOLUTION: A bending method for a segment coil 10 includes a first operation for twisting a first coil end row 28R1 in one direction in a circumferential direction and a second operation for twisting a second coil end row 28R2, which is adjacent to the first coil end row in a radial direction of a stator core, in the other direction in the circumferential direction. The timing in which the first coil end row 28R1 arrives at a movement completion position by the first operation is made different from the timing in which the second coil segment 28R2 arrives at a movement completion position by the second operation.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a method for bending a segment coil and an apparatus for bending a segment coil. [Background technology]

[0002] In the manufacturing process of a stator, a bending process is performed to form the coil ends of the segment coils inserted into the stator core into a predetermined shape. In this bending process, adjacent coil end rows among the multiple coil end rows aligned radially of the stator core are twisted in opposite directions in the circumferential direction. Patent Documents 1 and 2 disclose techniques for preventing damage to the insulating coating of the segment coils due to contact when the coil ends of adjacent coil end rows pass each other during the bending process. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3786059 [Patent Document 2] Patent No. 6798466 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, the segment coil needs to be processed into a special shape. In Patent Document 2, the jig used for bending needs to be processed into a special shape. Therefore, there is a need for an easier way to prevent damage to the insulating coating of the segment coil.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] A first aspect of the present disclosure is a bending method for segment coils, which twists multiple coil ends of multiple segment coils inserted into a stator core of a rotating electric machine, protruding from the stator core in the axial direction of the stator core, in a circumferential direction of the stator core, the bending method including: a first operation for twisting a first coil end row consisting of multiple first coil ends lined up in the circumferential direction among the multiple coil ends, in one direction of the circumferential direction; and a second operation, in parallel with the first operation, for twisting a second coil end row consisting of multiple second coil ends lined up in the circumferential direction among the multiple coil ends, adjacent to the first coil end row in the radial direction of the stator core, in the other direction of the circumferential direction, wherein the timing at which the first coil end row reaches a movement completion position by the first operation is made different from the timing at which the second coil end row reaches a movement completion position by the second operation.

[0007] A second aspect of the present disclosure is a segment coil winding method for a rotary electric machine, comprising: a first operation for twisting a first coil end row, which is made up of a plurality of first coil ends arranged in a circumferential direction of the stator core, among a plurality of coil ends of a plurality of segment coils inserted into the stator core and protruding in an axial direction of the stator core, in a first direction that is one of the circumferential directions; and a second operation for twisting a second coil end row, which is made up of a plurality of second coil ends arranged in the circumferential direction among the plurality of coil ends and adjacent to the first coil end row in a radial direction of the stator core, in a second direction that is the other of the circumferential directions, in parallel with the first operation. a first jig that engages with the first coil end row, a second jig that engages with the second coil end row, a first drive unit that rotates the first jig in the first direction to perform the first operation, a second drive unit that rotates the second jig in the second direction to perform the second operation, and a control unit that controls the first drive unit and the second drive unit, wherein the control unit differentiates the timing at which the first coil end row reaches a movement completion position by the first operation from the timing at which the second coil end row reaches a movement completion position by the second operation. [Effects of the Invention]

[0008] According to the present invention, the second operation, which is the twisting operation of the second coil end row, is delayed relative to the first operation, which is the twisting operation of the first coil end row, thereby avoiding strong contact between the thickest and most deformed portions of the coil ends.This makes it possible to prevent damage to the insulating coating in the thickest and most deformed portions of the coil ends.According to the present invention, damage to the insulating coating of the segment coils can be easily prevented. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a segment coil. [Figure 2] FIG. 2 is a perspective view of a stator core and a plurality of segment coils. [Figure 3] FIG. 3 is a schematic view of a bending apparatus according to an embodiment of the present invention. [Figure 4] FIG. 4 is a perspective view of a plurality of segment coils that have been twisted and bent. [Figure 5] FIG. 5 is a diagram illustrating a method for bending a segment coil. [Figure 6] FIG. 6 is a diagram illustrating the time difference between the first action and the second action. [Figure 7] FIG. 7 is a diagram illustrating contact between the bulging portions of the segment coils. [Figure 8] Fig. 8A is a diagram illustrating the first intersection of the segment coils, and Fig. 8B is a diagram illustrating the fifth intersection of the segment coils. [Figure 9] Figure 9A shows an ideal image of coil end behavior, Figure 9B shows an image of actual coil end behavior when there is no time difference, and Figure 9C shows an image of actual coil end behavior when there is a time difference. DETAILED DESCRIPTION OF THE INVENTION

[0010] As shown in FIG. 1, the segment coil 10 is generally U-shaped. The segment coil 10 has a conductor portion 12 and an insulating coating 14. The insulating coating 14 is, for example, enamel. The segment coil 10 has a pair of legs 16 and a turn portion 17. The pair of legs 16 are linear and extend parallel to each other. At the tip of each leg 16, a peeled portion 18 is provided where the insulating coating 14 has been peeled off to expose the conductor portion 12. Hereinafter, the portion of the segment coil 10 where the insulating coating 14 is provided will also be referred to as the "coating portion 15." The turn portion 17 is a portion of the segment coil 10 that connects the pair of legs 16. A meandering crank portion 20 is formed in the turn portion 17.

[0011] As shown in FIG. 2 , the stator core 24 of the rotating electric machine has a plurality of slots 26. In the following description, the circumferential direction, axial direction, and radial direction of the stator core 24 may be simply referred to as the "circumferential direction," the "axial direction," and the "radial direction," respectively. In the stator core 24, the plurality of slots 26 are spaced apart in the circumferential direction. A plurality of segment coils 10 are inserted into the plurality of slots 26. In this case, a pair of legs 16 of the segment coil 10 are inserted into separate slots 26.

[0012] As shown in Figure 3, when multiple segment coils 10 are inserted into the stator core 24, a pair of legs 16 of each segment coil 10 protrudes in the axial direction from a slot 26 (see also Figure 2) of the stator core 24. Hereinafter, the portion of each leg 16 protruding from the slot 26 will be referred to as a "coil end 28."

[0013] The multiple segment coils 10 are arranged in the circumferential direction of the stator core 24. The multiple segment coils 10 are also arranged in the radial direction of the stator core 24. Therefore, a coil end row 28R is formed by the multiple coil ends 28 arranged in the circumferential direction. The multiple coil end rows 28R are also arranged in the radial direction in the stator core 24. In this embodiment, eight coil end rows 28R are arranged in the radial direction. Hereinafter, of the eight coil end rows 28R, the radially innermost coil end row 28R is referred to as the first layer, and the radially outermost coil end row 28R is referred to as the eighth layer. In other words, the first to eighth layer coil end rows 28R are arranged in this order from the inside to the outside in the radial direction.

[0014] The plurality of segment coils 10 arranged in this manner are subjected to a twisting process (hereinafter simply referred to as "bending process"). As shown in Fig. 4, by bending, radially adjacent coil end rows 28R are twisted in opposite circumferential directions. The twisted coil ends 28 are joined at the tip ends (peeled portions 18) of the corresponding coil ends 28 by an appropriate means such as TIG welding.

[0015] Bending of multiple segment coils 10 can be performed using a bending device 30 shown in FIG. 3. The bending device 30 includes a first station 30A and a second station (not shown). The first station 30A performs bending on the outer four layers (fifth to eighth layers) of segment coils 10. The second station performs bending on the inner four layers (first to fourth layers) of segment coils 10. The basic configuration of the second station is the same as that of the first station 30A. Therefore, the following description will be given of the configuration of the first station 30A as a representative example.

[0016] The first station 30A includes a lifting unit 32 and a twisting unit 34. The lifting unit 32 is a mechanism for relatively displacing the stator core 24 and the twisting unit 34 in the axial direction. The lifting unit 32 includes a lifting table 36 and a lifting actuator 38. The lifting table 36 raises and lowers the stator core 24. The lifting table 36 includes a generally ring-shaped mounting plate 40, a holding jig 42 that holds the stator core 24, and a base 44 that supports the mounting plate 40 and the holding jig 42. The lifting actuator 38 raises and lowers the base 44. The mounting plate 40 and the holding jig 42 are raised and lowered together with the base 44 by the lifting actuator 38. Note that the mechanism for relatively displacing the stator core 24 and the twisting unit 34 in the axial direction (up and down) may be provided within the twisting unit 34 itself. That is, the twisting unit 34 may have a function of moving in the axial direction. In this case, the portion that holds the stator core 24 does not move in the axial direction.

[0017] The twisting unit 34 includes a plurality of twisting jigs 46, a plurality of rotational drive units 48, and a control device 50. The plurality of twisting jigs 46 are jigs for gripping the plurality of coil ends 28 protruding from the slots 26 of the stator core 24 and twisting the segment coils 10. The plurality of twisting jigs 46 engage with the plurality of coil end rows 28R, respectively.

[0018] Each of the multiple twisting jigs 46 has a substantially cylindrical shape. The multiple twisting jigs 46 are arranged concentrically. The multiple twisting jigs 46 are rotatably supported on a column 54 via multiple bearings 52. The multiple twisting jigs 46 include a first twisting jig 461, a second twisting jig 462, a third twisting jig 463, and a fourth twisting jig 464.

[0019] Each of the first twisting jig 461, the second twisting jig 462, the third twisting jig 463, and the fourth twisting jig 464 has an annular holding portion 56 that holds multiple coil ends 28. The holding portion 56 is provided at the lower end of each twisting jig 46. The multiple holding portions 56 are arranged concentrically. The outer periphery of each holding portion 56 is provided with multiple engagement grooves 58 spaced apart in the circumferential direction, into which the multiple coil ends 28 are inserted. Each engagement groove 58 opens radially outward and downward. The radially inward side of each engagement groove 58 is closed.

[0020] The multiple rotation drive units 48 individually rotate the multiple twist bending jigs 46 in the circumferential direction. Each rotation drive unit 48 has a motor 60 and a gear 62. The motor 60 is supported by the column 54. The gear 62 is fixed to the output shaft of the motor 60. The multiple rotation drive units 48 have a first rotation drive unit 481, a second rotation drive unit 482, a third rotation drive unit 483, and a fourth rotation drive unit 484. The first rotation drive unit 481, the second rotation drive unit 482, the third rotation drive unit 483, and the fourth rotation drive unit 484 rotate the first twist bending jig 461, the second twist bending jig 462, the third twist bending jig 463, and the fourth twist bending jig 464, respectively.

[0021] The multiple rotation drive units 48 rotate radially adjacent jigs among the multiple twist bending jigs 46 in opposite directions in the circumferential direction. That is, the rotation directions of the first twist bending jig 461 and the third twist bending jig 463 rotated by the first rotation drive unit 481 and the third rotation drive unit 483 are opposite to the rotation directions of the second twist bending jig 462 and the fourth twist bending jig 464 rotated by the second rotation drive unit 482 and the fourth rotation drive unit 484.

[0022] The control device 50 has a calculation unit 66 and a storage unit 68. The calculation unit 66 is configured by a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), that is, a processing circuitry.

[0023] The calculation unit 66 has a control unit 70. The control unit 70 controls the lift actuator 38 and the plurality of rotation drive units 48. The control unit 70 can be realized by the calculation unit 66 executing a program stored in the storage unit 68.

[0024] At least a part of the control unit 70 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). Also, at least a part of the control unit 70 may be configured by an electronic circuit including discrete devices.

[0025] The storage unit 68 is composed of a volatile memory (not shown) and a non-volatile memory (not shown). An example of the volatile memory is a random access memory (RAM). The volatile memory is used as a working memory for the processor, and temporarily stores data necessary for processing or calculation. An example of the non-volatile memory is a read-only memory (ROM) or a flash memory. The non-volatile memory is used as a storage memory, and stores programs, tables, maps, etc. At least a part of the storage unit 68 may be provided in the processor, integrated circuit, etc. described above.

[0026] The bending device 30 (first station 30A) operates as follows: First, the basic operation of the bending device 30 will be described.

[0027] The control unit 70 raises the lifting platform 36. As a result, the stator core 24 rises together with the lifting platform 36. As a result of the stator core 24 rising, the end coils of the segment coils 10 are inserted into the holding portions 56 (the engagement grooves 58) of the twisting jigs 46. Specifically, the fifth layer coil end row 28R is inserted into the holding portion 56 of the first twisting jig 461. The sixth layer coil end row 28R is inserted into the holding portion 56 of the second twisting jig 462. The seventh layer coil end row 28R is inserted into the holding portion 56 of the third twisting jig 463. The eighth layer coil end row 28R is inserted into the holding portion 56 of the fourth twisting jig 464.

[0028] In this state, the control unit 70 twists the fifth to eighth layer coil end rows 28R in the circumferential direction by rotating the first twisting jig 461, the second twisting jig 462, the third twisting jig 463, and the fourth twisting jig 464. In this case, the control unit 70 twists the fifth and seventh layer coil end rows 28R in a first direction, which is one of the circumferential directions, and twists the sixth and eighth layer coil end rows 28R in a second direction, which is the other of the circumferential directions. For radially adjacent coil end rows 28R, the operation of twisting one coil end row 28R is performed in parallel with the operation of twisting the other coil end row 28R.

[0029] This twisting operation twists and bends the multiple coil ends 28 that make up the fifth to eighth coil end rows 28R. In this case, as shown in Figure 4, each coil end 28 has an inclined portion 72 that is inclined with respect to the axial direction and an axial portion 74 that extends along the axial direction. A bent portion 76 is formed between the inclined portion 72 and the axial portion 74.

[0030] Next, the twisting operation performed by the bending device 30 shown in FIG. 3 will be described in more detail. The following description focuses on two radially adjacent coil end rows 28R, as shown in FIG. 5. For ease of explanation, one of the radially adjacent coil end rows 28R will be referred to as the "first coil end row 28R1," and the other will be referred to as the "second coil end row 28R2." Each of the coil ends 28 constituting the first coil end row 28R1 will be referred to as the "first coil end 28a." Each of the coil ends 28 constituting the second coil end row 28R2 will be referred to as the "second coil end 28b." The second coil end row 28R2 is positioned radially outward of the stator core 24 from the first coil end row 28R1.

[0031] The twisting operation of the bending device 30 includes a first operation and a second operation. The first operation is an operation of twisting the first coil end row 28R1 in a first direction (R1 direction) that is one of the circumferential directions. The second operation is an operation of twisting the second coil end row 28R2 in a second direction (R2 direction) that is the other of the circumferential directions, which is performed in parallel with the first operation. During the first and second operations, the first coil ends 28a and the second coil ends 28b sequentially pass each other (intersect). Of the multiple twisting jigs 46, one of the twisting jigs 46 that are adjacent to each other in the radial direction is referred to as the "first jig G1," and the other of the twisting jigs 46 that are adjacent to each other in the radial direction is referred to as the "second jig G2." Of the multiple rotational drivers 48, the driver that rotates the first jig G1 in the first direction to perform the first operation is referred to as the "first driver D1." Of the multiple rotation drive units 48, the drive unit that rotates the second jig G2 in the second direction so as to perform the second operation is referred to as the "second drive unit D2."

[0032] The control unit 70 differentiates the timing at which the first coil end row 28R1 reaches the movement completion position through the first operation from the timing at which the second coil end row 28R2 reaches the movement completion position through the second operation. Hereinafter, the former timing will also be referred to as the "first timing," and the latter timing will also be referred to as the "second timing."

[0033] Specifically, as shown in FIG. 6, the control unit 70 starts the second operation a predetermined time difference T after the start of the first operation. In this case, the movement speed of the first coil end row 28R1 in the first operation and the movement speed of the second coil end row 28R2 in the second operation are the same. Therefore, the second coil end row 28R2 reaches the movement completion position later than the first coil end row 28R1. In the case of the bending apparatus 30 shown in FIG. 2, the control unit 70 sequentially shifts the rotation start timing of the first twisting jig 461, the second twisting jig 462, the third twisting jig 463, and the fourth twisting jig 464 by the time difference T. Although the time difference T varies depending on the conditions, it is, for example, 0.2 seconds or more.

[0034] By starting the second operation with a predetermined time difference T after the start of the first operation, it is possible to avoid strong contact between the thickened and deformed portions of the coil ends 28. This makes it possible to prevent damage to the covering portion 15 in the thickened and deformed portions of the coil ends 28. The reason for this is as follows.

[0035] As shown in FIG. 4, the bending process forms a bent portion 76 between the inclined portion 72 and the axial portion 74 of the coil end 28. The tip of the covering portion 15 is located at this bent portion 76. In the final stage of the twisting operation for each coil end row 28R, the bending angle between the inclined portion 72 and the axial portion 74 becomes the largest. Therefore, in each coil end 28, in the final stage of the twisting operation, the tip of the covering portion 15 located at the bent portion 76 becomes the thickest in the radial direction. In particular, the portion of the tip of the covering portion 15 that is rearward in the direction of movement of the coil end 28 becomes the thickest.

[0036] Here, referring to FIG. 7, a situation in which peeling of the coating 15 may occur will be described. In FIG. 7, the bulging portions 80 are portions of the coil ends 28 that have become thicker due to bending during the twisting operation. Unlike the present embodiment, if the first timing and the second timing are the same, the bulging portions 80 come into strong contact with each other when the first coil ends 28a and the second coil ends 28b finally pass each other during the final stage of the twisting operation. Because the bulging portions 80 of the coil ends 28 include the peel boundary portions 19 (see FIG. 4), which are the boundaries between the coating 15 and the peeled portions 18, the strong contact between the bulging portions 80 of the coil ends 28 can cause peeling of the coating 15. Hereinafter, peeling that may occur due to this mechanism will also be referred to as "type 1 peeling." As shown in FIG. 8B, during the final stage of the twisting operation, each first coil end 28a intersects with a predetermined number of second coil ends 28b (five in FIG. 8B). The above phrase "when the first coil end 28a and the second coil end 28b finally pass each other" refers to the timing when each first coil end 28a crosses the fifth second coil end 28b in Fig. 8B during the first and second operations. Note that the first coil end row 28R1 and the second coil end row 28R2 are further twisted from the state shown in Fig. 8B, and are ultimately twisted to the state shown in Fig. 4.

[0037] On the other hand, when the first timing and the second timing are different, as in this embodiment, the second coil end array 28R2 reaches its movement completion position after the first coil end array 28R1 reaches its movement completion position. This prevents contact between the bulging portions 80 of the coil ends 28 in the first coil end array 28R1 and the second coil end array 28R2. By preventing contact between the bulging portions 80 of the coil ends 28, even if the coil ends 28 rub against each other in other areas, the surface pressure during the rubbing can be reduced. This prevents peeling (damage) of the covering portion 15, which is the insulating covering 14.

[0038] 6, the control unit 70 starts the second operation a predetermined time difference T after the start of the first operation. In this case, the time difference T is set to a time difference that can prevent peeling of the covering portions 15 of the first coil ends 28a and the second coil ends 28b when the first coil ends 28a and the second coil ends 28b first pass each other.

[0039] Here, "when the multiple first coil ends 28a and the multiple second coil ends 28b first pass each other" refers to the situation shown in Fig. 8A. As shown in Fig. 8A, while the first and second operations are progressing, the first coil ends 28a and the second coil ends 28b that protrude from circumferentially adjacent slots 26 pass each other (intersect). That is, Fig. 8A shows the first intersection of each first coil end 28a and each second coil end 28b.

[0040] The reason why the time difference T is set as above is as follows.

[0041] 9A to 9C schematically show the situation when the first coil end 28a and the second coil end 28b first pass each other while the first and second operations are in progress. As shown in Fig. 9A, the ideal behavior when twisting the first coil end 28a and the second coil end 28b is an arc motion along the circumferential direction of the stator core 24. However, as shown in Fig. 9B and Fig. 9C, the actual behavior when twisting the first coil end 28a and the second coil end 28b differs from that shown in Fig. 9A.

[0042] FIG. 9B shows an image of the actual behavior of the first coil end 28a and the second coil end 28b when there is no time difference T. The first jig G1 (FIG. 5) presses the first coil end 28a in the tangential direction, and the second jig G2 (FIG. 5) presses the second coil end 28b in the tangential direction. Therefore, when the first coil end 28a and the second coil end 28b pass each other, the first coil end 28a and the second coil end 28b are not parallel to each other, and the relative distance between the first coil end 28a and the second coil end 28b becomes smaller. The reason why the pressing direction of the first coil end 28a and the second coil end 28b is tangential as described above is as follows. As shown in FIG. 5, the length of the engagement groove 58 in the rotational direction (circumferential direction) of the bending jig 46 is slightly longer than the front-to-rear width of the coil end 28. This is to enable the coil end 28 to be inserted into the bending jig 46 without providing any additional mechanism. Because the dimensional relationship between the engagement groove 58 and the coil end 28 is as described above, the coil end 28 is not guided in the rotational direction (circumferential direction) when the bending jig 46 rotates, but is pushed in the tangential direction by the surface 58a of the engagement groove 58 that is behind the direction of travel of the bending jig 46.

[0043] FIG. 9C shows an image of the actual behavior of the first coil end 28a and the second coil end 28b when there is a time difference T. In this case, too, the first jig G1 pushes the first coil end 28a in the tangential direction, and the second jig G2 pushes the second coil end 28b in the tangential direction. However, when there is a time difference T, the movement distance of the second coil end 28b relative to the movement start position when the first coil end 28a and the second coil end 28b first pass each other is shorter than when there is no time difference T (FIG. 9B). Therefore, the relative distance between the first coil end 28a and the second coil end 28b when they first pass each other becomes even smaller. Therefore, if the time difference T is too large, the covered portion 15 of the first coil end 28a and the covered portion 15 of the second coil end 28b will rub strongly against each other when the first coil end 28a and the second coil end 28b first pass each other. This rubbing can cause peeling of the coating 15. Hereinafter, peeling that can occur through this mechanism will be referred to as "type 2 peeling." In type 2 peeling, peeling is particularly likely to occur at the front end of the coating 15 of each coil end 28 (peeling boundary 19 shown in FIG. 4) in the direction of movement of the coil end 28.

[0044] Therefore, in this embodiment, the time difference T is set to a value that will prevent peeling of the covering portions 15 of the first coil ends 28a and the second coil ends 28b when the first coil ends 28a and the second coil ends 28b first pass each other. By limiting the time difference T in this way, it is possible to suppress the second type of peeling. Although it will vary depending on the conditions, the time difference T that will prevent the second type of peeling is, for example, 0.3 seconds or less.

[0045] When the first coil ends 28a and the second coil ends 28b first pass each other, the circumferential rotation angle θ of the second coil end row 28R2 relative to the start position of the second operation is preferably 2.0° or greater. A rotation angle θ of 2.0° or greater prevents the radial distance between the first coil ends 28a and the second coil ends 28b from becoming too small when the first coil ends 28a and the second coil ends 28b first pass each other. This more effectively suppresses the second type of separation.

[0046] In the above-described embodiment, the second action is started a predetermined time difference T after the start of the first action, but the present invention is not limited to this. For example, the following modification 1 or modification 2 may be adopted as an embodiment in which the first action and the second action are started simultaneously.

[0047] In Modification 1, the control unit 70 simultaneously initiates the first operation and the second operation. In Modification 1, the control unit 70 reduces the movement speed of the second coil end row 28R2 after the first coil end 28a and the second coil end 28b have initially passed each other and before the first coil end 28a and the second coil end 28b have finally passed each other. This makes it possible to simultaneously suppress both the first type of separation and the second type of separation. That is, strong contact between the bulging portions 80 of the coil ends 28 when the first coil end 28a and the second coil end 28b finally pass each other is avoided, thereby suppressing the first type of separation. Furthermore, because the first operation and the second operation are simultaneously initiated, the second type of separation can also be suppressed.

[0048] In the second modified example, the control unit 70 simultaneously initiates the first and second operations. In the second modified example, the control unit 70 moves the second coil end array 28R2 at a speed slower than the speed of the first coil end array 28R1 so as to avoid strong contact between the bulging portions 80 of the coil ends 28 when the first coil end 28a and the second coil end 28b finally pass each other. This prevents strong contact between the bulging portions 80 of the coil ends 28 when the first coil end 28a and the second coil end 28b finally pass each other, thereby suppressing the first type of separation. In this case, to suppress the second type of separation, the difference between the speeds of the first coil end array 28R1 and the second coil end array 28R2 is set so that the relative radial distance between the first coil end 28a and the second coil end 28b does not become too small when the first coil end 28a and the second coil end 28b initially pass each other.

[0049] The following additional notes are further disclosed regarding the above embodiment.

[0050] (Appendix 1) The bending method for a segment coil (10) disclosed herein is a bending method for a segment coil that twists, in a circumferential direction of the stator core, a plurality of coil ends (28) of a plurality of segment coils that are inserted into the stator core (24) of a rotating electric machine and that protrude from the stator core in the axial direction of the stator core, and includes a first operation that twists, in one direction of the circumferential direction, a first coil end row (28R1) consisting of a plurality of first coil ends (28a) arranged in the circumferential direction among the plurality of coil ends, and a second operation that, in parallel with the first operation, twists, in the other direction of the circumferential direction, a second coil end row (28R2) consisting of a plurality of second coil ends (28b) arranged in the circumferential direction among the plurality of coil ends and adjacent to the first coil end row in the radial direction of the stator core, and the timing at which the first coil end row reaches a movement completion position by the first operation is made different from the timing at which the second coil end row reaches a movement completion position by the second operation.

[0051] (Supplementary Note 2) In the segment coil bending method described in Supplementary Note 1, the second operation may be started with a predetermined time difference (T) from the start of the first operation.

[0052] (Appendix 3) In the bending processing method for segment coils described in Appendix 2, the second coil end row is positioned radially outward of the stator core than the first coil end row, and the first coil ends and the second coil ends pass each other in sequence while the first operation and the second operation are progressing, and the time difference may be a time difference that can prevent peeling of the coating portions (15) of the first coil ends and the second coil ends when the first coil ends and the second coil ends first pass each other.

[0053] (Appendix 4) In the bending processing method for a segment coil described in Appendix 3, when the plurality of first coil ends and the plurality of second coil ends first pass each other, the rotation angle (θ) of the second coil end row in the circumferential direction based on the starting position of the second operation may be 2.0° or more.

[0054] (Supplementary Note 5) The segment coil bending device (30) of the present disclosure performs a first operation of twisting a first coil end row consisting of a plurality of first coil ends lined up in the circumferential direction of the stator core among a plurality of coil ends of a plurality of segment coils inserted into the stator core in the axial direction of the stator core, in a first direction that is one of the circumferential directions, and in parallel with the first operation, twists a second coil end row consisting of a plurality of second coil ends lined up in the circumferential direction among the plurality of coil ends and adjacent to the first coil end row in the radial direction of the stator core, in a second direction that is the other of the circumferential directions. a bending device for segment coils that performs a second operation by bending the first coil end row, the bending device comprising: a first jig (G1) that engages with the first coil end row; a second jig (G2) that engages with the second coil end row; a first drive unit (D1) that rotates the first jig in the first direction to perform the first operation; a second drive unit (D2) that rotates the second jig in the second direction to perform the second operation; and a control unit (70) that controls the first drive unit and the second drive unit, wherein the control unit differentiates the timing at which the first coil end row reaches a movement completion position by the first operation from the timing at which the second coil end row reaches a movement completion position by the second operation.

[0055] (Supplementary Note 6) In the segment coil bending device described in Supplementary Note 5, the control unit may start the second operation with a predetermined time difference from the start of the first operation.

[0056] (Appendix 7) In the segment coil bending device described in Appendix 6, the first coil ends and the second coil ends pass each other in sequence while the first operation and the second operation are in progress, and the second coil end row is positioned radially outward of the stator core relative to the first coil end row, and the time difference may be a time difference that can prevent peeling of the coating portions of the first coil ends and the second coil ends when the first coil ends and the second coil ends first pass each other.

[0057] (Appendix 8) In the segment coil bending processing device described in Appendix 7, the time difference may be set so that when the plurality of first coil ends and the plurality of second coil ends first pass each other, the rotation angle of the second coil end row in the circumferential direction based on the start position of the second operation is 2.0° or more.

[0058] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values ​​or mathematical expressions are used in the description of the above-described embodiments. [Explanation of symbols]

[0059] 10...Segment coil 24...Stator core 28... Coil end 28a... First coil end 28b...Second coil end 28R...Coil end row 28R1...First coil end row 28R2...Second coil end row 30... bending device 70... control unit G1...First jig G2...Second jig

Claims

1. A bending method for a segment coil, in which a plurality of coil ends of a plurality of segment coils inserted into a stator core of a rotating electric machine, protruding from the stator core in an axial direction of the stator core, are twisted in a circumferential direction of the stator core, a first operation of twisting a first coil end row, which is made up of a plurality of first coil ends arranged in the circumferential direction, among the plurality of coil ends, in one direction of the circumferential direction; a second operation, performed in parallel with the first operation, of twisting a second coil end row, which is made up of a plurality of second coil ends arranged in the circumferential direction and is adjacent to the first coil end row in the radial direction of the stator core, in another direction of the circumferential direction, A method for bending a segment coil, in which the timing at which the first coil end row reaches a movement completion position by the first operation is made different from the timing at which the second coil end row reaches a movement completion position by the second operation.

2. The segment coil bending method according to claim 1, A method for bending a segment coil, in which the second operation is started a predetermined time difference after the start of the first operation.

3. The segment coil bending method according to claim 2, the second coil end row is disposed radially outward of the stator core relative to the first coil end row, During the first operation and the second operation, the first coil ends and the second coil ends sequentially pass each other, A method for bending a segment coil, wherein the time difference is a time difference that can prevent peeling of the coating portions of the multiple first coil ends and the multiple second coil ends when the multiple first coil ends and the multiple second coil ends first pass each other.

4. The segment coil bending method according to claim 3, A method for bending a segment coil, wherein when the plurality of first coil ends and the plurality of second coil ends first pass each other, the circumferential rotation angle of the second coil end row based on the start position of the second operation is 2.0° or more.

5. A segment coil bending device performs a first operation of twisting a first coil end row consisting of a plurality of first coil ends lined up in the circumferential direction of the stator core among a plurality of coil ends of a plurality of segment coils inserted into the stator core in the axial direction of the stator core, in a first direction that is one of the circumferential directions, and concurrently with the first operation, performs a second operation of twisting a second coil end row consisting of a plurality of second coil ends lined up in the circumferential direction among the plurality of coil ends and adjacent to the first coil end row in the radial direction of the stator core, in a second direction that is the other of the circumferential directions, a first jig that engages with the first coil end row; a second jig that engages with the second coil end row; a first driving unit that rotates the first jig in the first direction so as to perform the first operation; a second driving unit that rotates the second jig in the second direction so as to perform the second operation; a control unit that controls the first drive unit and the second drive unit, The control unit of the segment coil bending processing device differentiates the timing at which the first coil end row reaches the movement completion position through the first operation from the timing at which the second coil end row reaches the movement completion position through the second operation.

6. The segment coil bending device according to claim 5, The control unit of the segment coil bending device starts the second operation a predetermined time difference after the start of the first operation.

7. The segment coil bending device according to claim 6, During the first operation and the second operation, the first coil ends and the second coil ends sequentially pass each other, the second coil end row is disposed radially outward of the stator core relative to the first coil end row, A segment coil bending processing device, wherein the time difference is a time difference that can prevent peeling of the coating portions of the multiple first coil ends and the multiple second coil ends when the multiple first coil ends and the multiple second coil ends first pass each other.

8. The segment coil bending device according to claim 7, A segment coil bending processing device, wherein the time difference is set so that when the multiple first coil ends and the multiple second coil ends first pass each other, the rotation angle of the second coil end row in the circumferential direction based on the start position of the second operation is 2.0° or more.

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