Bending method for segmented coil and bending device for segmented coil

Abstract

The invention provides a bending processing method of a segmented coil and a bending processing device of the segmented coil. This bending method for a segmented coil (10) comprises: a first operation for twisting and bending a first coil end row (28R1) in one direction in the circumferential direction; and a second operation in which a second coil end row (28R2) is twisted and bent in the other direction in the circumferential direction, the second coil end row (28R2) being adjacent to the first coil end row in the radial direction of the stator core (24). The point in time at which the first coil end row (28R1) reaches the movement completion position by the first operation is different from the point in time at which the second coil end row (28R2) reaches the movement completion position by the second operation. The bending device (30) for the segmented coil implements the above bending method. Therefore, the damage to the insulating film of the segment coil can be simply prevented.

Description

Technical Field

[0001] The present invention relates to a segment coil bending method and a segment coil bending device. Background Art

[0002] During the stator manufacturing process, bending is performed to shape the coil ends of the segment coils inserted into the stator core into a predetermined shape. This bending process twists and bends adjacent coil end rows, one of multiple rows arranged radially along the stator core, in opposite directions in the circumferential direction. Japanese Patent Nos. 3786059 and 6798466 disclose techniques for preventing damage to the insulation coating of the segment coils from contact when the coil ends of adjacent coil end rows are offset from one another during bending. Summary of the Invention

[0003] However, Japanese Patent No. 3786059 requires the segment coils to be machined into a special shape. Japanese Patent No. 6798466 requires the bending jig to be machined into a special shape. Therefore, there is a need for a simpler way to prevent damage to the insulation coating of the segment coils.

[0004] The purpose of the present invention is to solve the above-mentioned technical problems.

[0005] A first aspect of the present invention is a segment coil bending method for twisting and bending a plurality of coil ends of a plurality of segment coils inserted through a stator core of a rotating electrical machine, the coil ends protruding axially from the stator core, in a circumferential direction of the stator core. The segment coil bending method includes a first operation and a second operation, wherein the first operation is an operation of twisting and bending a first coil end row in one direction in the circumferential direction, the first coil end row consisting of a plurality of first coil end rows arranged in the circumferential direction among the plurality of coil end rows; and the second operation is an operation of twisting and bending a second coil end row in another direction in the circumferential direction, in parallel with the first operation. The second coil end row consists of a plurality of second coil end rows arranged in the circumferential direction among the plurality of coil end rows and is adjacent to the first coil end row in a radial direction of the stator core. The segment coil bending method is configured such that the time when the first coil end row reaches a movement completion position by the first operation and the time when the second coil end row reaches the movement completion position by the second operation are different.

[0006] A second aspect of the present invention is a segmented coil bending device, the segmented coil bending device performing a first action and a second action, wherein the first action refers to an action of twisting and bending a first coil end row in one direction of the circumference of a stator core, that is, a first direction, the first coil end row is composed of a plurality of first coil ends arranged along the circumference of the stator core among a plurality of coil ends, the plurality of coil ends being coil ends protruding from the stator core toward the axial direction of the stator core of a plurality of segmented coils inserted into the stator core of a rotating electrical machine; the second action refers to an action of twisting and bending a second coil end row in another direction of the circumference, that is, a second direction, in parallel with the first action, the second coil end row being composed of a plurality of second coil ends arranged along the circumference among a plurality of coil ends. The coil end is formed and is adjacent to the first coil end row in the radial direction of the stator core. The bending processing device for the segment coil includes a first jig, a second jig, a first drive unit, a second drive unit and a control unit, wherein the first jig is engaged with the first coil end row; the second jig is engaged with the second coil end row; the first drive unit rotates the first jig in the first direction to perform the first action; the second drive unit rotates the second jig in the second direction to perform the second action; the control unit controls the first drive unit and the second drive unit, and the control unit makes the time point when the first coil end row reaches the movement completion position through the first action and the time point when the second coil end row reaches the movement completion position through the second action different.

[0007] According to the present invention, the twisting and bending action (second action) of the second coil end row is delayed relative to the twisting and bending action (first action) of the first coil end row. This prevents strong contact between the thickest deformed portions of the coil ends. Consequently, damage to the insulation coating at the thickest deformed portions of the coil ends can be prevented. According to the present invention, damage to the insulation coating of the segment coils can be easily prevented.

[0008] The above-mentioned objects, features and advantages will be easily understood from the following description of the embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional diagram of the segmented coil.

[0010] Figure 2 It is a three-dimensional diagram of the stator core and multiple segmented coils.

[0011] Figure 3 It is a schematic diagram of a bending apparatus according to an embodiment of the present invention.

[0012] Figure 4This is a three-dimensional view of multiple segment coils after twist bending.

[0013] Figure 5 This is a diagram illustrating a method for bending a segment coil.

[0014] Figure 6 This is a diagram explaining the time difference between the first operation and the second operation.

[0015] Figure 7 This is a diagram illustrating contact between bulging portions of a segment coil.

[0016] Figure 8A This is a diagram illustrating the first crossing of the segment coil. Figure 8B This is a diagram illustrating the fifth crossing of the segment coil.

[0017] Figure 9A This is a diagram showing an ideal behavior image of the coil end. Figure 9B This is a diagram showing an actual behavior image of the coil end portion when there is no time difference. Figure 9C This is a diagram showing an actual behavior image of the coil end portion when there is a time difference. DETAILED DESCRIPTION

[0018] like Figure 1 As shown, the segment coil 10 is roughly U-shaped. The segment coil 10 has a conductor portion 12 and an insulating coating 14. The insulating coating 14 is, for example, an enamel coating. The segment coil 10 has a pair of legs 16 and a bend portion 17. The pair of legs 16 are straight and extend parallel to each other. A peeling portion 18 is provided at the top end of each leg 16. The peeling portion 18 is a portion from which the conductor portion 12 is peeled off by peeling off the insulating coating 14. Hereinafter, the portion of the segment coil 10 where the insulating coating 14 is provided is referred to as the "covering portion 15." The bend portion 17 is a portion of the segment coil 10 that connects the pair of legs 16. A crank portion 20 having a meandering shape is formed in the bend portion 17.

[0019] like Figure 2 As shown, the stator core 24 of the rotating electrical machine has a plurality of slots 26. In the following description, the circumferential, axial, and radial directions of the stator core 24 may be referred to simply as "circumferential," "axial," and "radial," respectively. In the stator core 24, the plurality of slots 26 are spaced apart in the circumferential direction. The plurality of segment coils 10 are inserted into the plurality of slots 26. In this case, a pair of legs 16 of the segment coils 10 are inserted into each slot 26.

[0020] like Figure 3 As shown, in a state where a plurality of segment coils 10 are inserted into the stator core 24, a pair of legs 16 of each segment coil 10 is inserted from the slots 26 of the stator core 24 (see also FIG. Figure 2) protrudes in the axial direction. Hereinafter, the portion of each leg 16 that protrudes from the slot 26 is referred to as a "coil end 28."

[0021] A plurality of segment coils 10 are arranged along the circumferential direction of the stator core 24. In addition, a plurality of segment coils 10 are arranged along the radial direction of the stator core 24. Therefore, a coil end row 28R is formed by a plurality of coil ends 28 arranged along the circumferential direction. In addition, in the stator core 24, a plurality of coil end rows 28R are arranged along the radial direction. In this embodiment, eight coil end rows 28R are arranged in the radial direction. Below, with respect to the eight coil end rows 28R, the coil end row 28R on the innermost side in the radial direction is designated as the first layer, and the coil end row 28R on the outermost side in the radial direction is designated as the eighth layer. That is, the coil end rows 28R on the first to eighth layers are arranged in sequence from the inner side to the outer side in the radial direction.

[0022] The plurality of segment coils 10 arranged in this manner are subjected to a twist bending process (hereinafter referred to as "bending process"). Figure 4 As shown, radially adjacent coil end rows 28R are twisted and bent in opposite directions in the circumferential direction by bending. The top ends (peeled portions 18) of the twisted and bent coil end rows 28 corresponding to each other are then joined together by a suitable method such as TIG welding.

[0023] The bending process of the plurality of segment coils 10 can be performed using Figure 3 Bending is performed using bending apparatus 30 shown in FIG. Bending apparatus 30 includes a first station 30A and a second station (not shown). First station 30A bends the outer four layers (fifth to eighth layers) of segment coil 10. Second station bends the inner four layers (first to fourth layers) of segment coil 10. The basic structure of the second station is the same as that of first station 30A. Therefore, the structure of first station 30A will be described below as a representative example.

[0024] The first station 30A includes a lifting unit 32 and a torsional bending unit 34. The lifting unit 32 is a mechanism for relative displacement of the stator core 24 and the torsional bending unit 34 in the axial direction. The lifting unit 32 includes a lifting platform 36 and a lifting actuator 38. The lifting platform 36 lifts and lowers the stator core 24. The lifting platform 36 includes a generally annular loading plate 40, a holding fixture 42 for holding the stator core 24, and a base 44 for supporting the loading plate 40 and the holding fixture 42. The lifting actuator 38 lifts and lowers the base 44. The loading plate 40 and the holding fixture 42 are lifted and lowered together with the base 44 by the lifting actuator 38. Alternatively, the mechanism for relative displacement of the stator core 24 and the torsional bending unit 34 in the axial direction (vertical direction) may be provided in the torsional bending unit 34 itself. That is, the torsional bending unit 34 may also have the function of moving in the axial direction. In this case, the portion holding the stator core 24 does not move in the axial direction.

[0025] Twist-bending unit 34 includes multiple twist-bending jigs 46, multiple rotation drive units 48, and a control device 50. Multiple twist-bending jigs 46 are jigs used to twist and bend segment coils 10 by gripping multiple coil ends 28 protruding from slots 26 of stator core 24. Multiple twist-bending jigs 46 are engaged with multiple coil end rows 28R, respectively.

[0026] Each of the twisting and bending jigs 46 has a substantially cylindrical shape. The twisting and bending jigs 46 are arranged concentrically. The twisting and bending jigs 46 are rotatably supported on a support 54 via a plurality of bearings 52. The twisting and bending jigs 46 include a first twisting and bending jig 461, a second twisting and bending jig 462, a third twisting and bending jig 463, and a fourth twisting and bending jig 464.

[0027] The first twisting and bending jig 461, the second twisting and bending jig 462, the third twisting and bending jig 463, and the fourth twisting and bending jig 464 each have an annular retaining portion 56 for retaining a plurality of coil ends 28. The retaining portion 56 is provided at the lower end of each twisting and bending jig 46. The plurality of retaining portions 56 are arranged in a concentric circle. A plurality of engaging grooves 58 for inserting the plurality of coil ends 28 are provided at intervals along the circumferential direction on the outer periphery of each retaining portion 56. Each engaging groove 58 opens radially outward and downward. The radial inner side of each engaging groove 58 is closed.

[0028] The plurality of rotational drive units 48 individually rotate the plurality of twist and bend jigs 46 in the circumferential direction. Each rotational drive unit 48 includes a motor 60 and a gear 62. The motor 60 is supported by a support column 54. The gear 62 is fixed to the output shaft of the motor 60. The plurality of rotational drive units 48 include a first rotational drive unit 481, a second rotational drive unit 482, a third rotational drive unit 483, and a fourth rotational drive unit 484. The first rotational drive unit 481, the second rotational drive unit 482, the third rotational drive unit 483, and the fourth rotational drive unit 484 rotate the first twist and bend jig 461, the second twist and bend jig 462, the third twist and bend jig 463, and the fourth twist and bend jig 464, respectively.

[0029] The plurality of rotational drive units 48 rotate radially adjacent jigs in the plurality of twisting and bending jigs 46 in opposite directions circumferentially. Specifically, the rotational directions of the first and third twisting and bending jigs 461, 463 rotated by the first and third rotational drive units 481, 483 are opposite to the rotational directions of the second and fourth twisting and bending jigs 462, 464 rotated by the second and fourth rotational drive units 482, 484.

[0030] The control device 50 includes a calculation unit 66 and a storage unit 68. The calculation unit 66 is composed of a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), that is, a processing circuit.

[0031] The calculation unit 66 includes a control unit 70. The control unit 70 controls the lifting 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.

[0032] Furthermore, at least a portion of the control unit 70 may be implemented by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). Furthermore, at least a portion of the control unit 70 may be implemented by an electronic circuit including discrete devices.

[0033] The storage unit 68 is composed of a volatile memory (not shown) and a non-volatile memory (not shown). Examples of volatile memory include RAM (Random Access Memory). Volatile memory is used as working memory for the processor, temporarily storing data required for processing or calculations. Examples of non-volatile memory include ROM (Read Only Memory) and flash memory. Non-volatile memory is used as storage memory, storing programs, tables, maps, etc. At least a portion of the storage unit 68 may be provided in the processor, integrated circuit, etc. described above.

[0034] The bending device 30 (first station 30A) operates as follows. First, the basic operation of the bending device 30 will be described.

[0035] Controller 70 raises lift table 36. This causes stator core 24 to rise along with lift table 36. As stator core 24 rises, the coil ends of segment coils 10 are inserted into retaining portions 56 (engaging slots 58) of twist and bend jigs 46. Specifically, coil end row 28R of the fifth layer is inserted into retaining portion 56 of first twist and bend jig 461. Coil end row 28R of the sixth layer is inserted into retaining portion 56 of second twist and bend jig 462. Coil end row 28R of the seventh layer is inserted into retaining portion 56 of third twist and bend jig 463. Coil end row 28R of the eighth layer is inserted into retaining portion 56 of fourth twist and bend jig 464.

[0036] In this state, the control unit 70 twists and bends the fifth through eighth coil end rows 28R in the circumferential direction by rotating the first twisting and bending jig 461, the second twisting and bending jig 462, the third twisting and bending jig 463, and the fourth twisting and bending jig 464. In this case, the control unit 70 twists and bends the fifth through seventh coil end rows 28R in the first direction, which is one circumferential direction, and twists and bends the sixth through eighth coil end rows 28R in the second direction, which is the other circumferential direction. For radially adjacent coil end rows 28R, the twisting and bending of one coil end row 28R is performed simultaneously with the twisting and bending of the other coil end row 28R.

[0037] By this twisting and bending action, the plurality of coil ends 28 constituting the fifth to eighth layer coil end rows 28R are twisted and bent. Figure 4 As shown, each coil end portion 28 has an inclined portion 72 inclined with respect to the axial direction and an axial portion 74 extending in the axial direction. A bent portion 76 is formed between the inclined portion 72 and the axial portion 74.

[0038] Then, Figure 3 The twisting bending action of the bending processing device 30 shown in FIG will be described in more detail. Figure 5 As shown, the following description focuses on two coil end rows 28R that are radially adjacent to each other among the multiple coil end rows 28R. For ease of explanation, of the coil end rows 28R that are radially adjacent to each other, one coil end row 28R is referred to as the "first coil end row 28R1," and the other coil end row 28R is referred to as the "second coil end row 28R2." Furthermore, the multiple coil ends 28 that constitute the first coil end row 28R1 are each referred to as the "first coil end 28a." The multiple coil ends 28 that constitute the second coil end row 28R2 are each referred to as the "second coil end 28b." The second coil end row 28R2 is arranged radially outward of the stator core 24 relative to the first coil end row 28R1.

[0039] The twisting and bending action of the bending device 30 includes a first action and a second action. The first action is an action of twisting and bending the first coil end row 28R1 in one circumferential direction, namely the first direction (R1 direction). The second action is an action of twisting and bending the second coil end row 28R2 in another circumferential direction, namely the second direction (R2 direction), in parallel with the first action. During the first and second actions, the plurality of first coil ends 28a and the plurality of second coil ends 28b are staggered (crossed) in sequence. Among the plurality of twisting and bending jigs 46, one of the twisting and bending jigs 46 adjacent to each other in the radial direction is referred to as the "first jig G1", and the other of the twisting and bending jigs 46 adjacent to each other in the radial direction is referred to as the "second jig G2". Among the plurality of rotation drive units 48, the drive unit that rotates the first jig G1 in the first direction to perform the first action is referred to as the "first drive unit D1". Among the plurality of rotation drive units 48 , a drive unit that rotates the second jig G2 in the second direction to perform the second operation is referred to as a “second drive unit D2 ”.

[0040] The control unit 70 sets the time point at which the first coil end row 28R1 reaches the movement completion position through the first operation and the time point at which the second coil end row 28R2 reaches the movement completion position through the second operation to be different. Hereinafter, the former time point will also be referred to as the "first time point." The latter time point will also be referred to as the "second time point."

[0041] Specifically, if Figure 6 As shown, the control unit 70 starts the second action after a predetermined time difference T is delayed from the start of the first action. In this case, the moving speed of the first coil end row 28R1 based on the first action and the moving speed of the second coil end row 28R2 based on the second action are the same. Therefore, the second coil end row 28R2 reaches the movement completion position later than the first coil end row 28R1. Figure 2 In the bending apparatus 30 shown, the control unit 70 sequentially shifts the rotation start times of 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 by a time difference T. The time difference T is, for example, 0.2 seconds or more, but varies depending on the conditions.

[0042] By delaying the start of the second operation by a predetermined time difference T from the start of the first operation, it is possible to prevent strong contact between the thicker deformed portions of the coil end portions 28. Therefore, it is possible to prevent damage to the coating 15 in the thicker deformed portions of the coil end portions 28. The reason for this is as follows.

[0043] like Figure 4As shown, a bent portion 76 is formed between the inclined portion 72 and the axial portion 74 of the coil end 28 by bending. The top end of the covering portion 15 is located at this bent portion 76. At the final stage of the torsional bending operation performed on each coil end row 28R, the bending angle between the inclined portion 72 and the axial portion 74 reaches its maximum. Therefore, at the final stage of the torsional bending operation, the top end of the covering portion 15 located at the bent portion 76 becomes the thickest in the radial direction at each coil end 28. In particular, the portion of the top end of the covering portion 15 located rearward of the coil end 28 in its moving direction becomes the thickest.

[0044] Here, refer to Figure 7 , the situation in which the coating portion 15 may peel off is described. Figure 7 In the embodiment, the bulge 80 is a portion of the coil end 28 that becomes thicker due to bending as the torsional bending action proceeds. Unlike the present embodiment, when the first time point and the second time point are the same, at the final stage of the torsional bending action, when the first coil end 28a and the second coil end 28b are finally offset, the bulge 80 strongly contacts each other. The peeling boundary 19 (see FIG. 1 ) that is the boundary between the covering portion 15 and the peeling portion 18 is formed. Figure 4 ) is located at the bulge 80 of the coil end 28. Therefore, due to the strong contact between the bulges 80 of the coil end 28, the covering portion 15 may be peeled off. Hereinafter, the peeling that may be caused by this mechanism will be referred to as "first type peeling". Figure 8B As shown, in the final stage of the torsional bending operation, each first coil end 28a becomes aligned with a predetermined plurality of (in Figure 8B The above-mentioned "when the first coil end 28a and the second coil end 28b are finally staggered" means that during the first action and the second action, each first coil end 28a and Figure 8B The fifth second coil end 28b in the crossover point. In addition, the first coil end row 28R1 and the second coil end row 28R2 are formed by Figure 8B The state is further twisted and bent, and finally twisted and bent to Figure 4 The status shown.

[0045] On the other hand, as in the present embodiment, when the first time point and the second time point are different, after the first coil end row 28R1 reaches the movement completion position, the second coil end row 28R2 reaches the movement completion position. Therefore, in the first coil end row 28R1 and the second coil end row 28R2, it is possible to avoid the bulging portions 80 of the coil ends 28 from contacting each other. By avoiding the bulging portions 80 of the coil ends 28 from contacting each other, even when the coil ends 28 rub against each other at other parts, the surface pressure when rubbing against each other can be reduced. Accordingly, it is possible to suppress peeling (damage) of the covering portion 15 serving as the insulating coating 14.

[0046] like Figure 6 As shown, the control unit 70 starts the second operation after the start of the first operation by a predetermined time difference T. In this case, the time difference T is set to a time difference that can prevent the covering portions 15 of the plurality of first coil ends 28a and the covering portions 15 of the plurality of second coil ends 28b from being peeled off when the plurality of first coil ends 28a and the plurality of second coil ends 28b are initially offset.

[0047] Here, "when the plurality of first coil ends 28a and the plurality of second coil ends 28b are initially offset" means Figure 8A As shown in the following example. Figure 8A As shown in FIG, during the first and second actions, the first coil end 28a and the second coil end 28b protruding from the slots 26 adjacent to each other in the circumferential direction are staggered (crossed). Figure 8A , the first intersection is shown for each first coil end portion 28a and each second coil end portion 28b.

[0048] The reason for setting the time difference T as described above is as follows.

[0049] Figures 9A to 9C The following diagram schematically shows the situation when the first coil end 28a and the second coil end 28b are initially offset during the first and second actions. Figure 9A As shown in FIG. 1 , the ideal behavior when the first coil end 28a and the second coil end 28b are twisted and bent is to move in an arc along the circumferential direction of the stator core 24. In contrast, Figure 9B and Figure 9C As shown in FIG. 1 , the actual behavior when the first coil end 28a and the second coil end 28b are twisted and bent is similar to the Figure 9A different.

[0050] Figure 9B The image shows 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 ( Figure 5) The direction of pressing the first coil end 28a is the tangential direction, and the second jig G2 ( Figure 5 ) The direction of pressing the second coil end 28b is the tangential direction. Therefore, when the first coil end 28a and the second coil end 28b are offset, 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 direction of pressing the first coil end 28a and the second coil end 28b is the tangential direction as described above is as follows. Figure 5 As shown, 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-back width of the coil end 28. This allows the coil end 28 to be inserted into the bending jig 46 without requiring a separate mechanism. Due to the dimensional relationship between the engagement groove 58 and the coil end 28 as described above, when the bending jig 46 rotates, the coil end 28 is not guided in the rotational direction (circumferential direction) but is instead pressed tangentially by the surface 58a of the engagement groove 58 located behind the direction of travel of the bending jig 46.

[0051] Figure 9C The image shows 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, the direction in which the first jig G1 presses the first coil end 28a is the tangential direction, and the direction in which the second jig G2 presses the second coil end 28b is the tangential direction. However, when there is a time difference T, the distance moved by the first coil end 28a and the second coil end 28b when they are first offset is greater than the distance moved when there is no time difference T ( Figure 9B ) is small. Therefore, the relative distance between the first coil end 28a and the second coil end 28b becomes smaller when they are initially offset. Therefore, in the case where the time difference T is too large, when the first coil end 28a and the second coil end 28b are initially offset, the covering portion 15 of the first coil end 28a and the covering portion 15 of the second coil end 28b will strongly rub against each other. Through this mutual friction, peeling of the covering portion 15 may occur. Below, the peeling that may occur through such a mechanism will also be referred to as "second type peeling". In the second type peeling, the top end ( Figure 4 In the peeling boundary portion 19 shown, peeling is particularly likely to occur on the front side in the moving direction of the coil end portion 28.

[0052] Therefore, in this embodiment, the time difference T is set to a time difference that prevents the covering portion 15 of the first coil end portions 28a from peeling off from the covering portion 15 of the second coil end portions 28b when the first coil end portions 28a and the second coil end portions 28b are initially offset. By limiting the time difference T in this manner, the second type of peeling can be suppressed. The time difference T for preventing the second type of peeling is, for example, 0.3 seconds or less, but varies depending on the conditions.

[0053] Preferably, when the plurality of first coil ends 28a and the plurality of second coil ends 28b are initially offset, the circumferential rotation angle θ of the second coil end row 28R2 is greater than 2.0°, based on the starting position of the second operation. By setting the rotation angle θ greater than 2.0°, the relative radial distance between the first coil ends 28a and the second coil ends 28b can be prevented from becoming excessively small during the initial offset. This can more effectively suppress the second type of peeling.

[0054] In addition, in the above embodiment, the second operation is started after a predetermined time difference T from the start of the first operation, but the present invention is not limited to this. For example, as a method of starting the first and second operations simultaneously, the following Modification 1 or Modification 2 may also be adopted.

[0055] In modification example 1, the control unit 70 starts the first action and the second action at the same time. In modification example 1, after the first coil end 28a and the second coil end 28b are initially offset and before the first coil end 28a and the second coil end 28b are finally offset, the control unit 70 reduces the moving speed of the second coil end row 28R2. Accordingly, it is possible to simultaneously suppress the first type of peeling and the second type of peeling. That is, it is possible to avoid the bulging portions 80 of the coil ends 28 from strongly contacting each other when the first coil end 28a and the second coil end 28b are finally offset, thereby suppressing the first type of peeling. In addition, since the first action and the second action are started at the same time, it is also possible to suppress the second type of peeling.

[0056] In the second variation, the control unit 70 simultaneously initiates the first and second operations. In variation 2, the control unit 70 causes the second coil end row 28R2 to move at a slower speed than the first coil end row 28R1 to prevent strong contact between the bulging portions 80 of the first coil end 28a, 28b when the first coil end 28a, 28b are finally displaced. This prevents strong contact between the bulging portions 80 of the coil ends 28 when the first coil end 28a, 28b are finally displaced, thereby suppressing the first type of separation. In this case, to suppress the second type of separation, the difference between the moving speeds of the first coil end row 28R1 and the second coil end row 28R2 is set so that the relative radial distance between the first coil end 28a, 28b does not become too small when the first coil end 28a, 28b are initially displaced.

[0057] Regarding the above-mentioned embodiment, the following supplementary notes are also disclosed.

[0058] (Supplementary Note 1) The bending processing method of the segmented coil (10) of the present invention is to twist and bend a plurality of coil ends (28) of a plurality of segmented coils inserted into the stator core (24) of the rotating electric machine, which protrude axially from the stator core toward the stator core, toward the circumferential direction of the stator core. The bending processing method of the segmented coil includes a first action and a second action, wherein the first action is an action of twisting and bending a first coil end row (28R1) toward one direction of the circumferential direction, and the first coil end row (28R1) is composed of a plurality of first coil ends (28R1) arranged along the circumferential direction among the plurality of coil ends. 28a); the second action refers to an action of twisting and bending the second coil end row (28R2) in the other direction of the circumferential direction in parallel with the first action, the second coil end row (28R2) is composed of a plurality of second coil ends (28b) arranged along the circumferential direction among the plurality of coil ends and is adjacent to the first coil end row in the radial direction of the stator core, and the bending processing method of the segmented coil is such that the time point when the first coil end row reaches the movement completion position through the first action and the time point when the second coil end row reaches the movement completion position through the second action are different.

[0059] (Supplementary Note 2) In the segment coil bending method described in Supplementary Note 1, the second operation may be started with a delay of a predetermined time difference (T) from the start of the first operation.

[0060] (Note 3) In the bending processing method of the segmented coil described in Note 2, the second coil end row can also be arranged at a position radially outside the stator core than the first coil end row, and during the first action and the second action, the multiple first coil ends and the multiple second coil ends are staggered in sequence, and the time difference refers to the time difference that can prevent the peeling of the covering parts (15) of the multiple first coil ends and the covering parts of the multiple second coil ends when the multiple first coil ends and the multiple second coil ends are initially staggered.

[0061] (Note 4) In the bending processing method of the segmented coil described in Note 3, it can also be that when the multiple first coil ends and the multiple second coil ends are initially offset, the rotation angle (θ) of the second coil ends in the circumferential rotation based on the starting position of the second action is greater than 2.0°.

[0062] (Supplementary Note 5) The segmented coil bending processing device (30) of the present invention performs a first action and a second action, wherein the first action refers to an action of twisting and bending the first coil end row in one direction of the circumference of the stator core, that is, the first direction, wherein the first coil end row is composed of a plurality of first coil ends arranged along the circumference of the stator core among a plurality of coil ends, and the plurality of coil ends refer to coil ends of a plurality of segmented coils inserted into the stator core of the rotating motor, which protrude from the stator core in the axial direction of the stator core; and the second action refers to an action of twisting and bending the second coil end row in the other direction of the circumference, that is, the second direction, in parallel with the first action, wherein the second coil end row is composed of a plurality of second coil ends arranged along the circumference among a plurality of coil ends and is radially opposite to the first coil end row in the radial direction of the stator core. The coil end rows are adjacent to each other, and the bending processing device for the segmented coil comprises a first jig (G1), a second jig (G2), a first drive unit (D1), a second drive unit (D2) and a control unit (70), wherein the first jig (G1) is engaged with the first coil end row; the second jig (G2) is engaged with the second coil end row; the first drive unit (D1) rotates the first jig in the first direction to perform the first action; the second drive unit (D2) rotates the second jig in the second direction to perform the second action; the control unit (70) controls the first drive unit and the second drive unit, and the control unit makes the time point when the first coil end row reaches the movement completion position through the first action and the time point when the second coil end row reaches the movement completion position through the second action different.

[0063] (Supplementary Note 6) In the segment coil bending apparatus according to Supplementary Note 5, the control unit may start the second operation with a delay of a predetermined time difference from the start of the first operation.

[0064] (Supplementary Note 7) In the segmented coil bending processing device described in Supplementary Note 6, it can also be that during the first action and the second action, the plurality of first coil ends and the plurality of second coil ends are staggered in sequence, and the second coil end row is arranged at a position radially outside the stator core than the first coil end row, and the time difference is the time difference that can prevent the covering portions of the plurality of first coil ends and the covering portions of the plurality of second coil ends from peeling off when the plurality of first coil ends and the plurality of second coil ends are initially staggered.

[0065] (Note 8) In the bending processing device for the segmented coil described in Note 7, the time difference may be set to a time difference in which the rotation angle of the second coil end group toward the circumferential rotation is greater than 2.0° based on the starting position of the second action when the plurality of first coil ends and the plurality of second coil ends are initially offset.

[0066] Although the present invention has been described in detail, the present invention is not limited to the above-mentioned embodiments. These embodiments can be supplemented, replaced, changed, partially deleted, etc. without departing from the scope of the present invention or without departing from the scope of the present invention derived from the contents recorded in the technical solution and its equivalents. In addition, these embodiments can also be implemented in combination. For example, in the above-mentioned embodiment, the order of each action and the order of each processing are shown as an example, but are not limited to this. In addition, the same applies when numerical values ​​or mathematical formulas are used in the description of the above-mentioned embodiment.

Claims

1. A segment coil bending method, comprising: twisting and bending a plurality of coil ends of a plurality of segment coils inserted through a stator core of a rotating electrical machine, the coil ends protruding from the stator core in an axial direction of the stator core, toward the circumferential direction of the stator core. It is characterized in that The segment coil bending method includes a first action and a second action, wherein: The first action is an action of twisting and bending a first coil end row in one direction of the circumferential direction, the first coil end row being composed of a plurality of first coil end portions arranged along the circumferential direction among the plurality of coil end portions; The second action is an action of twisting and bending a second coil end row in the other direction of the circumferential direction in parallel with the first action, wherein the second coil end row is composed of a plurality of second coil end rows arranged along the circumferential direction among the plurality of coil end rows and is adjacent to the first coil end row in the radial direction of the stator core. The segment coil bending method causes the first coil end row to reach the movement completion position by the first operation and the second coil end row to reach the movement completion position by the second operation to differ in time.

2. The segment coil bending method according to claim 1, wherein: The second operation is started with a delay of a predetermined time difference from the start of the first operation.

3. The segment coil bending method according to claim 2, wherein: The second coil end row is arranged radially outward of the stator core relative to the first coil end row. During the first and second actions, the first coil ends and the second coil ends are sequentially shifted. The time difference is a time difference that can prevent the covering portions of the first coil ends and the second coil ends from peeling off when the first coil ends and the second coil ends are initially offset.

4. The segment coil bending method according to claim 3, wherein: When the plurality of first coil ends and the plurality of second coil ends are initially offset, a rotation angle of the second coil end row in the circumferential direction is 2.0° or more based on a starting position of the second operation.

5. A segmented coil bending device, characterized in that: The segment coil bending processing device performs a first operation and a second operation, wherein the first operation is an operation of twisting and bending a first coil end row in a first direction, which is one direction in the circumferential direction of the stator core, wherein the first coil end row is composed of a plurality of first coil end rows arranged along the circumferential direction of the stator core among a plurality of coil end rows, wherein the plurality of coil end rows are coil end rows protruding from the stator core in the axial direction of the stator core of a plurality of segment coils inserted through the stator core of the rotating electrical machine; and the second operation is an operation of twisting and bending a second coil end row in a second direction, which is another direction in the circumferential direction, in parallel with the first operation, wherein the second coil end row is composed of a plurality of second coil end rows arranged along the circumferential direction among the plurality of coil end rows and is adjacent to the first coil end row in the radial direction of the stator core. The segment coil bending device includes a first jig, a second jig, a first driving unit, a second driving unit, and a control unit, wherein: The first fixture is engaged with the first coil end row; The second fixture is engaged with the second coil end row; The first driving unit rotates the first jig in the first direction to perform the first action; The second driving unit rotates the second jig in the second direction to perform the second action; The control unit controls the first drive unit and the second drive unit. The control unit makes a timing at which the first coil end row reaches a movement completion position by the first operation different from a timing at which the second coil end row reaches a movement completion position by the second operation.

6. The segment coil bending device according to claim 5, characterized in that: The control unit starts the second operation with a delay of a predetermined time difference from the start of the first operation.

7. The segment coil bending device according to claim 6, characterized in that: During the first and second actions, the first coil ends and the second coil ends are sequentially shifted. The second coil end row is arranged radially outward of the stator core relative to the first coil end row. The time difference is a time difference that can prevent the covering portions of the first coil ends and the covering portions of the second coil ends from being peeled off when the first coil ends and the second coil ends are initially offset.

8. The segment coil bending device according to claim 7, characterized in that: The time difference is set so that when the plurality of first coil ends and the plurality of second coil ends are initially offset, the rotation angle of the second coil end row in the circumferential direction is greater than or equal to 2.0° based on the starting position of the second operation.

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