Coil separation method and coil separation device

Abstract

The invention provides a coil separation method and a coil separation device. A coil separation method for separating a coil (120) from a stator (100) having a stator core (110) in which a plurality of slots (112) are formed on the inner peripheral surface and the coil (120) attached to the plurality of slots, the coil separation method including a cutting step for cutting a coil end portion (130), which is a portion of the coil protruding from an end surface of the stator core, and a separation step for separating the coil (120) from the stator (100), the coil end portion (130) being a portion of the coil protruding from the end surface of the stator core. And a separation step in which the coil is separated from the stator core by pressing the cut portion of the coil by the pressing member (32) in a state in which the teeth (122) located between the slots in the stator core are supported by the support member (10). Accordingly, the coil can be easily separated from the stator without forcibly deforming the coil.

Description

Technical Field

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

[0002] In recent years, from the viewpoint of global environmental protection, attempts have been made to separate coils from the stator of a used rotating electric machine for recycling instead of discarding them.

[0003] In the prior art, as a method for separating a coil from a stator, a method is known in which the coil end parts protruding from both end faces in the central axis direction of the stator core are pressed inward in the radial direction of the stator core, and thus the coil is taken out from the shaft hole of the stator core (for example, refer to Japanese Patent Application Laid-Open Publication No. 2021-13222). Summary of the Invention

[0004] In particular, compared with the coils used in the stator of a rotating electric machine for vehicles, the coils used in the stator of a rotating electric machine for household appliances have a high coil density, and the coils are bonded to each other by varnish or the like. Therefore, in the case of forcibly deforming the coils, it is necessary to press the outer surface of the coil end part with a strong force. Since it is necessary to press at a plurality of positions in the circumferential direction of the annular coil end part, it is necessary to arrange large-sized pressing devices at a plurality of parts in the circumferential direction of the stator, which inevitably leads to the enlargement of the separation device. In addition, since a large force is required to separate the coil from the stator, it is also difficult, for example, to pull out the coil from the stator along the central axis direction.

[0005] Moreover, in the method of forcibly deforming the coil by pressing the outer surface of the coil end part with force, impurities other than the coil are likely to adhere to the coil surface. If impurities adhere to the coil, when the coil taken out from the stator is melted for recycling, the concentration of impurities in the melt increases, which may limit the range of reuse of the coil.

[0006] Therefore, a method and a device for easily separating a coil from a stator without forcibly deforming the coil are desired.

[0007] An object of the present invention is to solve the above technical problems.

[0008] A first aspect of the present invention is a coil separation method for separating a coil from a stator (detaching the coil from the stator). The stator includes a stator core having a plurality of slots formed in its inner circumferential surface and the coils mounted in the plurality of slots. The coil separation method includes a cutting step and a separation step. In the cutting step, a portion of the coil protruding from an end face of the stator core, i.e., a coil end portion, is cut. In the separation step, while the teeth of the stator core located between the slots are supported by a support member, a pressing member presses the cut portion of the coil to separate the coil from the stator core.

[0009] A second aspect of the present invention is a coil separation device for separating a coil from a stator. The stator includes a stator core having a plurality of slots formed in its inner circumferential surface and the coils mounted in the plurality of slots. The coil separation device has a support member and a pressing member. The support member supports the teeth of the stator in which the coil end portions have been cut off, and the coil end portions refer to the portions of the coils protruding from the end face of the stator core. The pressing member presses the cut portion of the coil while the teeth are supported to separate the coil from the stator core.

[0010] According to the aspect of the present invention, it is not necessary to press the outer surface of the coil end portion to forcibly deform it. Therefore, the impurities contained in the coil separated from the stator core do not increase, and there is no need to worry about the limitation of the reuse range of the coil. Also, the coils in the slots can move smoothly along the central axis of the stator core. As a result, the coil can be easily separated from the stator without forcibly deforming the coil.

[0011] The above objects, features, and advantages should be easily understood from the following description of the embodiments with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a perspective view of the stator.

[0013] Figure 2 is a diagram showing a segment conductor.

[0014] Figure 3 is a schematic diagram showing the coil separation device.

[0015] Figure 4 is a perspective view showing the jig arrangement.

[0016] Figure 5 is a diagram showing a state where the stator with both the first coil end portion and the second coil end portion cut off is supported by the support member.

[0017] Figure 6 It is a bottom view showing the pressing jig.

[0018] Figure 7 It is a figure showing the cutting process.

[0019] Figure 8 It is a figure showing the state in which the stator is arranged in the coil separation device.

[0020] Figure 9 It is a figure showing the pressing process.

[0021] Figure 10 It is a figure showing the state in which the coil is separated from the stator core.

[0022] Figure 11 It is a figure showing the state in which the pressing jig returns to the initial position. Detailed implementation manners

[0023] Figure 1 It is a perspective view of the stator 100. The stator 100 has a stator core 110 and a coil 120.

[0024] Here, the directions shown in the figures are described. The X1-X2 direction is the direction along the central axis X of the stator 100 and the stator core 110. The X1-X2 direction is also the linear movement direction of the pressing jig 3 described later. In each figure, the X1 direction represents the upper direction, and the X2 direction represents the lower direction. However, the X1-X2 direction is not necessarily limited to the upper and lower directions along the gravity direction. The X1-X2 direction can be a direction inclined with respect to the gravity direction, for example, it can also be a horizontal direction.

[0025] The stator core 110 is formed by laminating a plurality of annular thin electromagnetic steel sheets with a central opening. The stator core 110 has a shaft hole 111, a first end face F10, and a second end face F20. The shaft hole 111 is located at the center of the stator core 110. The first end face F10 faces the X1 direction along the central axis X of the stator core 110. The second end face F20 faces the X2 direction along the central axis X of the stator core 110.

[0026] On the inner peripheral surface of the stator core 110, a plurality of slots 112 are formed at equal intervals. The slots 112 open in a fine groove shape toward the shaft hole 111. In addition, the slots 112 are formed in a straight line in the direction along the central axis X of the stator core 110. The slots 112 penetrate the stator core 110 and open at the first end face F10 and the second end face F20, respectively.

[0027] On the stator core 110, a plurality of through holes 113 are formed that penetrate in the direction along the central axis X of the stator core 110. The plurality of through holes 113 are arranged at equal intervals in the circumferential direction of the stator core 110. The number of through holes 113 is 6, but it is not limited thereto.

[0028] The stator core 110 has a core body 121 and a plurality of teeth 122. The core body 121 is the outer peripheral part of the stator core 110. The teeth 122 are the parts of the stator core 110 located between the slots 112. The teeth 122 protrude from the core body 121 toward the central axis X of the stator core 110.

[0029] The coil 120 is an aggregate of conductors composed of a plurality of flat wires. More specifically, the coil 120 is an aggregate of a plurality of segmented conductors 140. The plurality of segmented conductors 140 constituting the coil 120 are respectively installed in the respective slots 112 of the stator core 110. The coil 120 has two coil ends 130 protruding from the end face of the stator core 110. One of the two coil ends 130 is the first coil end 131 protruding from the first end face F10, which is one end face of the stator core 110. The other of the two coil ends 130 is the second coil end 132 protruding from the second end face F20, which is the other end face of the stator core 110.

[0030] The coil 120 is formed by connecting a plurality of segmented conductors 140. Figure 2 It is a diagram showing the segmented conductor 140.

[0031] The segmented conductor 140 includes a pair of legs 142 and a turning part 144 connecting the pair of legs 142. The legs 142 of the segmented conductor 140 are inserted into the slots 112. The legs 142 have a first part 142A located in the slot 112, a second part 142B protruding from the first end face F10, and a third part 142C protruding from the second end face F20. A plurality of legs 142 are inserted into one slot 112. The plurality of legs 142 inserted into one slot 112 are the legs 142 of different segmented conductors 140. The first part 142A is covered with insulating paper 150. More specifically, the plurality of first parts 142A located in one slot 112 are divided into several groups by the insulating paper 150, and the first parts 142A of each group are covered with the insulating paper 150 (see Figure 5 ).

[0032] The first coil end 131 is composed of the second part 142B of the leg 142. The second coil end 132 is composed of the third part 142C of the leg 142 and the turning part 144. A welding part 160 is provided at the first coil end 131. One segmented conductor 140 and another segmented conductor 140 are connected at the welding part 160. In addition, no welding part 160 is provided at the second coil end 132.

[0033] In the segmented conductor 140, a straight part 170 extending in the direction along the central axis X of the stator core 110 is formed (see Figure 2)。The straight portion 170 is located at the first portion 142A, the root 171 of the first coil end 131, and the root 172 of the second coil end 132. The length of the portion of the straight portion 170 located at the root 171 of the first coil end 131 is shorter than the length of the portion of the straight portion 170 located at the root 172 of the second coil end 132. The reason is due to the method of forming the segmented conductor 140.

[0034] That is, the segmented conductor 140 formed of a U-shaped conductor (flat wire) is inserted into the slot 112 from the second end face F20 of the stator core 110 and bent in such a manner that the conductors protruding from the first end face F10 of the stator core 110 approach each other. After that, the portions of the segmented conductor 140 that approach each other are welded together to form the first coil end 131 (the second portion 142B of the leg 142). When the segmented conductor 140 is bent, the segmented conductor 140 is liable to bend with the stator core 110 as a fulcrum. Therefore, the length of the portion of the straight portion 170 located at the root 171 of the first coil end 131 is relatively short.

[0035] In the present embodiment, after both the first coil end 131 and the second coil end 132 of the coil 120 included in the stator 100 as described above are cut off, the coil 120 is separated from the stator core 110.

[0036] Next, Figures 3 - 6 the coil separation device 1 will be described. The coil separation device 1 includes a placement jig 2 and a pressing jig 3.

[0037] As Figure 3 and Figure 4 shown, the placement jig 2 includes a support member 10 that supports the stator 100 from which the first coil end 131 and the second coil end 132 have been cut off. The support member 10 may be fixedly provided at a predetermined position of the coil separation device 1. Alternatively, the support member 10 may be set at a predetermined position of the coil separation device 1 by the operation of a moving mechanism such as a robot or a sliding table (not shown) during the coil separation operation.

[0038] The support member 10 is formed of a metal such as stainless steel, for example. The support member 10 has a support surface F30 against which the stator core 110 abuts. The support surface F30 is formed flat along a direction orthogonal to the axis of the support member 10.

[0039] The support member 10 has a disk-shaped base portion 12, a circular tubular outer support portion 14, and a cylindrical inner support portion 16. The base portion 12, the outer support portion 14, and the inner support portion 16 may be integrally formed or separately formed. In the case where the base portion 12, the outer support portion 14, and the inner support portion 16 are separately formed, the base portion 12, the outer support portion 14, and the inner support portion 16 are joined together by welding or the like.

[0040] The outer support portion 14 and the cylindrical inner support portion 16 are fixed to the end face of the base portion 12. The base portion 12 is provided at a specified position of the coil separating device 1. In addition, the support member 10 may not have the base portion 12. In this case, the outer support portion 14 and the cylindrical inner support portion 16 are provided at a specified position of the coil separating device 1.

[0041] A plurality of pillar insertion holes 20 are formed in the outer support portion 14. The plurality of pillar insertion holes 20 are formed at positions corresponding to the positions of the plurality of through holes 113 formed in the stator core 110. The pillar insertion hole 20 is a hole for erecting a straight bar-shaped guide pillar 5 (see Figure 8 ) when separating the coil 120 from the stator 100. The pillar insertion hole 20 extends from one end face of the outer support portion 14 in a direction along the axis of the outer support portion 14. One end face of the outer support portion 14 is included in the support surface F30 of the support member 10. The axis of the outer support portion 14 coincides with the axis of the support member 10.

[0042] The core body 121 in the stator 100 from which both the first coil end portion 131 and the second coil end portion 132 are cut off abuts against one end face of the outer support portion 14. More specifically, the first end face F10 of the core body 121 of the stator core 110 abuts against one end face of the outer support portion 14.

[0043] The inner support portion 16 is located inside the outer support portion 14 in a state of being separated from the outer support portion 14. The coil 120 pressed out from the stator core 110 can pass through the gap 22 between the inner support portion 16 and the outer support portion 14. The gap 22 extends from the support surface F30 of the support member 10 along the axis of the support member 10 to reach the other end portion F40 of the outer support portion 14 ( Figure 3 ). The gap 22 is surrounded by the inner support portion 16, the outer support portion 14, and the base portion 12. Therefore, the gap 22 can accommodate the coil 120 pressed out from the stator core 110.

[0044] On the outer peripheral surface of the inner support portion 16, a plurality of recesses 24 are formed at intervals in the circumferential direction of the inner support portion 16 (see Figure 4)。The shapes of the multiple recesses 24 are the same. The recesses 24 extend from one end surface of the inner support portion 16 in a direction along the axis of the inner support portion 16. One end surface of the inner support portion 16 is included in the support surface F30 of the support member 10. The axis of the inner support portion 16 coincides with the axis of the support member 10.

[0045] The end portion (lower end portion) 24E of the recess 24 ( Figure 3 ) is located between one end portion (the support surface F30 of the support member 10) of the inner support portion 16 and the other end portion F50 of the inner support portion 16 ( Figure 3 ), but is not limited thereto. The end portion 24E of the recess 24 may also reach the other end portion F50 of the inner support portion 16.

[0046] The convex portions 26 are defined by the recesses 24 adjacent to each other in the circumferential direction of the inner support portion 16. In other words, when viewed from above along the central axis X, the inner support portion 16 is formed in a gear shape (see Figure 4 ). The number of the convex portions 26 is the same as the number of the teeth 122, but is not limited thereto. The number of the convex portions 26 may also be less than the number of the teeth 122. In this case, in order to stably support the stator 100, it is preferable that the convex portions 26 are arranged symmetrically with respect to the axis of the inner support portion 16.

[0047] In the stator 100 in which both the first coil end portion 131 and the second coil end portion 132 are cut off, the teeth 122 abut against the convex portions 26. Figure 5 FIG. is a view showing a state in which the stator 100 in which both the first coil end portion 131 and the second coil end portion 132 are cut off is supported by the support member 10.

[0048] As Figure 5 shown, the top portions of the teeth 122 of the stator core 110 abut against the convex portions 26 on the first end surface F10 (see Figure 1 ). The area of the portion of the convex portion 26 where the teeth 122 abut is set according to the volume of the coil 120. The width of the recess 24 in the circumferential direction of the inner support portion 16 is larger than the width of the slot 112 in the circumferential direction of the stator core 110. The width of the convex portion 26 in the circumferential direction of the inner support portion 16 is smaller than the width of the tooth 122 in the circumferential direction of the stator core 110.

[0049] As Figures 3 - 5 shown, in addition to the disk-shaped base portion 12, the cylindrical outer support portion 14, and the cylindrical inner support portion 16, the support member 10 may also have a positioning portion 28 for positioning the radial position of the stator core 110.

[0050] As Figure 3 and Figure 4As shown, the positioning portion 28 is provided on one end face of the inner support portion 16. This one end face of the inner support portion 16 is included in the support surface F30 of the support member 10. The positioning portion 28 may be integrally formed with the inner support portion 16 or may be separately formed from the inner support portion 16. In the case where the positioning portion 28 is separately formed from the inner support portion 16, the positioning portion 28 and the inner support portion 16 are joined by welding or the like. The positioning portion 28 is formed in a plate shape, but is not limited thereto. The positioning portion 28 has a peripheral side surface F28 that protrudes from the support surface F30 of the support member 10 and is in the direction along the circumferential direction of the inner support portion 16. The peripheral side surface F28 of the positioning portion 28 extends in the direction along the axis of the inner support portion 16.

[0051] As Figure 5 shown, when viewed from above along the central axis X, the peripheral side surface F28 of the positioning portion 28 is located between the top surface F26 of the convex portion 26 and the bottom surface F24 of the concave portion 24. In other words, the bottom surface F24 of the concave portion 24 is located at a position closer to the inside than the peripheral side surface F28 of the positioning portion 28. In a state where the convex portion 26 of the inner support portion 16 supports the tooth 122, the positioning portion 28 is located inside the stator core 110, and the peripheral side surface F28 of the positioning portion 28 faces the top surface F122 of the tooth 122. The peripheral side surface F28 of the positioning portion 28 abuts against the top surface F122 of the tooth 122, but is not limited thereto. A slight gap may also be generated between the peripheral side surface F28 of the positioning portion 28 and the top surface F122 of the tooth 122. This gap is narrower than the dimension between the convex portion 26 and the inner wall surface 112a of the groove 112.

[0052] As Figure 4 shown, in addition to the disk-shaped base portion 12, the circular tubular outer support portion 14, and the cylindrical inner support portion 16, the support member 10 may also have an identification portion 30 for aligning the phase of the stator core 110 with the support member 10.

[0053] The identification portion 30 is a plurality of notches formed at equal intervals in the direction along the circumferential direction of the inner support portion 16 on the positioning portion 28, but is not limited thereto. For example, the identification portion 30 may also be a mark marked on the surface of the positioning portion 28. Or, the identification portion 30 may also be a mark marked on one end face of the outer support portion 14.

[0054] As Figure 3 and Figure 6 shown, the pressing jig 3 is a jig for pressing out the coil 120 from the groove 112 of the stator core 110. The pressing jig 3 has a disk-shaped jig substrate 31 and a plurality of pressing members 32.

[0055] The jig substrate 31 and the plurality of pressing members 32 are formed of a metal such as stainless steel. The jig substrate 31 and the plurality of pressing members 32 may be integrally formed or separately formed. In the case where the jig substrate 31 and the plurality of pressing members 32 are separately formed, the jig substrate 31 and the plurality of pressing members 32 are joined together by welding or the like. The jig substrate 31 and the plurality of pressing members 32 are arranged at predetermined positions of the coil separating device 1.

[0056] The jig substrate 31 is mounted on a pressing device that linearly moves by a cylinder (not shown) or the like. The jig substrate 31 is configured to be able to linearly move along the central axis X of the stator 100. On the jig substrate 31, a plurality of pillar through-holes 33 are formed at equal intervals in the circumferential direction. The plurality of pillar through-holes 33 are holes for inserting and guiding the pillars 5 when separating the coil 120 from the stator 100. The plurality of pillar through-holes 33 are arranged corresponding to the positions of the plurality of through-holes 113 formed in the stator core 110.

[0057] The plurality of pressing members 32 are fixed to the jig substrate 31 so as to protrude from the jig substrate 31 in the same direction. The plurality of pressing members 32 are radially arranged at equal intervals around the central axis X of the jig substrate 31. The lengths of the pressing members 32 in the protruding direction are all the same. The dimension of the pressing member 32 in the direction along the central axis X is greater than or equal to the dimension of the slot 112 in the direction along the central axis X. The dimension of the pressing member 32 in the direction along the radial direction of the jig substrate 31 may also be smaller than the dimension of the slot 112 in the direction along the radial direction of the stator core 110. The normal direction of the top surface of the pressing member 32 coincides with the protruding direction (length direction) of the pressing member 32. The top surface of the pressing member 32 is formed flat.

[0058] The number and arrangement of the pressing members 32 are respectively the same as the number and arrangement of the slots 112 of the stator core 110. The cross-sectional shapes are the same when each pressing member 32 is cut in a direction perpendicular to the direction of the central axis X of the jig substrate 31. The cross-sectional shape of the pressing member 32 is slightly smaller than the opening shape of the slot 112 that opens at the first end face F10 and the second end face F20 of the stator core 110. Therefore, the pressing members 32 can be respectively inserted into the corresponding slots 112.

[0059] The coil separating device 1, at least during the coil separating operation, as Figure 3 shown, arranges the positioning jig 2 and the pressing jig 3 on the same axis along the central axis X. At least one of the positioning jig 2 and the pressing jig 3 is arranged to be rotatable about the respective central axis X by the operation of a rotation mechanism (not shown). Such a rotation mechanism is provided in the coil separating device 1.

[0060] Next, with reference to Figures 7 - 11 a coil separation method using the coil separating device 1 will be described.

[0061] First, as Figure 7 shown, the cutting device 4 with the rotary blade 41 is used to cut the two coil ends 130 (the first coil end 131 and the second coil end 132) of the stator core 110. The rotary blade 41 cuts the coil ends 130 along the cutting line CL parallel to the end faces (the first end face F10 and the second end face F20) of the stator core 110 from the outer peripheral side or the inner peripheral side of the coil ends 130. In this way, the separation of the coil ends 130 is carried out.

[0062] The cutting line CL is set at a position close to the end faces (the first end face F10 and the second end face F20) of the stator core 110. Specifically, the cutting line CL is set at the roots 171 of the first coil end 131 and the roots 172 of the second coil end 132. When the two coil ends 130 are cut off, the coils 120 remaining in the stator 100 are substantially straight.

[0063] Next, as Figure 8 shown, the stator 100 from which the first coil end 131 and the second coil end 132 are both cut off is conveyed to a specified position of the coil separation device 1 by the action of a conveying device such as a robot (not shown). Specifically, in a state where the first end face F10 of the stator core 110 faces the placement jig 2 and the second end face F20 of the stator core 110 faces the pressing jig 3, the stator 100 is placed between the placement jig 2 and the pressing jig 3.

[0064] When placing the stator 100, the guide posts 5 are respectively inserted into the plurality of pillar insertion holes 20 of the support member 10. The guide posts 5 inserted into the pillar insertion holes 20 protrude in the normal direction of the support surface F30 of the support member 10. The guide posts 5 may also be pre - set in the pillar insertion holes 20.

[0065] By inserting the guide posts 5 into the plurality of through - holes 113 respectively, the stator 100 is positioned on the support member 10. In the positioned state, the stator 100 moves along the guide posts 5 toward the support member 10 by the action of a conveying device (not shown). After that, the first end face F10 of the stator core 110 abuts against the support surface F30 of the support member 10.

[0066] As Figure 9 shown, in a state where the first end face F10 of the stator core 110 abuts against the support surface F30 of the support member 10, the outer support portion 14 of the support member 10 supports the core body 121. In addition, as Figure 5As shown, the plurality of convex portions 26 formed on the inner support portion 16 of the support member 10 respectively support the teeth 122. On the support member 10, a marking portion 30 is provided for aligning the phase of the stator core 110 with the support member 10. Accordingly, it is possible to confirm whether there is a positional deviation between the convex portion 26 and the tooth 122.

[0067] In a state where the first end face F10 of the stator core 110 abuts against the support face F30 of the support member 10, the circumferential side face F28 of the positioning portion 28 provided at one end face of the inner support portion 16 abuts against the top face F122 of the tooth 122. In addition, the portion of the slot 112 that opens in the radial direction of the stator core 110 is located in the recess 24 between the convex portions 26 while being away from the circumferential side face F28 of the positioning portion 28.

[0068] After the first end face F10 of the stator core 110 abuts against the support face F30 of the support member 10, at least one of the jig 2 and the pressing jig 3 rotates about the central axis X by the action of a rotation mechanism (not shown). Accordingly, the coil separating device 1 aligns the phases of the plurality of pressing members 32 provided on the pressing jig 3 and the plurality of slots 112 formed in the stator core 110. Accordingly, the positions of the plurality of slots 112 and the positions of the plurality of pressing members 32 are aligned along the central axis X direction of the stator 100.

[0069] After the phase adjustment, the pressing jig 3 moves in the X2 direction toward the stator 100 by the action of a pressing device (not shown). According to this movement, the plurality of guide posts 5 penetrating the stator 100 are respectively inserted into the post through holes 33, and accordingly, the pressing jig 3 is positioned with respect to the stator 100.

[0070] When the pressing jig 3 further moves in the X2 direction toward the stator 100, as Figure 9 shown, the tips of the pressing members 32 respectively abut against the cutting portions that slightly protrude from the slots 112 on the second end face F20 of the stator core 110. This cutting portion is the root 172 of the second coil end portion 132 ( Figure 7 ).

[0071] When the pressing jig 3 further moves in the X2 direction, as Figure 5 shown, each pressing member 32 simultaneously presses the first portion 142A of the coil 120 in the corresponding slot 112 in the X2 direction. Accordingly, the coil 120 gradually moves toward the support member 10 with respect to the stator core 110. Since the support member 10 supports the core body 121 and the teeth 122 on the first end face F10 of the stator core 110, the pressing jig 3 can stably press the coil 120 of the stator 100.

[0072] As Figure 7As shown, the length of the portion of the straight portion 170 at the root 171 of the first coil end portion 131 is shorter than the length of the portion of the straight portion 170 at the root 172 of the second coil end portion 132. Therefore, when cutting the root 171 of the first coil end portion 131, sometimes the curved portion is cut by the rotary blade 41 (see Figure 7 ). In this case, even after cutting, the portion of the root 171 that is connected to the first portion 142A of the coil 120 overlaps with the stator core 110 in the direction of the central axis X of the stator core 110. Therefore, the coil 120 moving toward the support member 10 is caught by the stator core 110, increasing the load on the pressing jig 3.

[0073] In the present embodiment, the cutting portion of the root 172 of the second coil end portion 132 is pressed instead of the root 171 of the first coil end portion 131. Accordingly, it is possible to prevent the coil 120 moving toward the support member 10 from being caught by the stator core 110. As a result, it is possible to prevent the load on the pressing jig 3 from increasing excessively.

[0074] As the coil 120 moves toward the support member 10, the insulating paper 150 covering the first portion 142A of the coil 120 located in the slot 112 also moves toward the support member 10. This is because the frictional resistance between the insulating paper 150 and the first portion 142A of the coil 120 is greater than the frictional resistance between the insulating paper 150 and the stator core 110. As Figure 5 shown, at the inner support portion 16 of the support member 10, the convex portion 26 supports the central portion at the top of the tooth 122. Both the convex portion 26 and the concave portion 24 are away from the inner wall surface 112a of the slot 112. Therefore, even if the insulating paper 150 covering the coil 120 moves toward the support member 10, it is possible to prevent the insulating paper 150 from coming into contact with the inner support portion 16. As a result, it is possible to prevent the load on the pressing jig 3 from increasing due to the contact between the insulating paper 150 and the support member 10.

[0075] On one end face of the inner support portion 16, a positioning portion 28 for positioning the radial position of the stator core 110 is provided. The positioning portion 28 has a peripheral side surface F28 facing the top surface F122 of the tooth 122 supported by the support surface F30 of the support member 10. Accordingly, it is possible to suppress the positional deviation of the stator core 110 relative to the support member 10. Therefore, it is possible to guide the coil 120 and the insulating paper 150 covering the first portion 142A of the coil 120 in the direction along the central axis X of the stator core 110.

[0076] The dimension of the pressing member 32 in the direction along the central axis X is equal to or greater than the dimension of the slot 112 in the direction along the central axis X. Therefore, as Figure 10As shown, when the jig substrate 3 of the pressing jig 3 moves to abut against the second end face F20 of the stator core 110, the tip of the pressing member 32 protrudes from the first end face F10 of the stator core 110. Accordingly, the coil 120 is pressed out of the slot 112 of the stator core 110 all at once.

[0077] After that, as Figure 11 shown, the pressing jig 3 moves in the X1 direction away from the disposing jig 2. Accordingly, the pressing jig 3 returns to the initial position, and the separation operation ends.

[0078] In the above coil separation method and the coil separation device 1, with the teeth 122 supported by the supporting member 10, the cutting portion of the coil 120 is pressed by the pressing member 32, so that the coil 120 is separated from the stator core 110. Accordingly, it is not necessary to press the outer surface of the coil end portion 130 to forcibly deform it. Therefore, the impurities contained in the coil 120 separated from the stator core 110 do not increase, and there is no need to worry that the reuse range of the coil 120 is limited. Also, the coil 120 in the slot 112 can smoothly move along the central axis X of the stator core 110. As a result, the coil 120 can be easily separated from the stator 100 without being forcibly deformed.

[0079] The above-described embodiment can also be modified as follows.

[0080] The guide post 5 can also be inserted through the disposing jig 2 and the stator 100, instead of being inserted through the pressing jig 3. Or, the guide post 5 can also be not provided.

[0081] The convex portion 26 of the supporting member 10 can also extend along the radial direction of the stator core 110 and be connected to the outer supporting portion 14.

[0082] Or, the supporting member 10 can also not have the base portion 12, the outer supporting portion 14, and the inner supporting portion 16, but have a first biasing supporting portion and a second biasing supporting portion (not shown). The first biasing supporting portion biases the top face F122 of one or more of the plurality of teeth 122 toward the outside of the stator core 110. The second biasing supporting portion biases the top face F122 of the teeth 122 on the side opposite to the teeth 122 biased by the first biasing supporting portion toward the outside of the stator core 110.

[0083] Or, the supporting member 10 can also not have the base portion 12, the outer supporting portion 14, and the inner supporting portion 16, but have a radial supporting portion (not shown). The radial supporting portion extends radially corresponding to the plurality of teeth 122 of the stator core 110 and supports the teeth 122 on the first end face F10 of the stator core 110.

[0084] It is also possible to prepare a plurality of pressing jigs 3, and the plurality of pressing jigs 3 have pressing members 32 corresponding to the size of the stator 100, the number of slots 112 of the stator core 110, etc. In this case, the coil separating device 1 can also be configured to select and use the optimal pressing jig 3 according to the type of the stator 100 to be separated.

[0085] The plurality of pressing members 32 provided on the pressing jig 3 are not limited to the same number as the number of slots 112 of the stator core 110. It is also possible to provide pressing members 32 on the jig substrate 31 in a number less than the number of slots 112, as long as the pressing members 32 press the coils 120 in any of the plurality of slots 112 formed in the stator core 110. In addition, the pressing member 32 can also be one. In this case, the coil separating device 1 alternately repeats the pressing action and the phase alignment action. Accordingly, all the coils 120 located on the plurality of teeth 122 can be separated from the stator core 110.

[0086] The plurality of pressing members 32 provided on the pressing jig 3 are not limited to having the same length in the protruding direction. The pressing jig 3 can also include pressing members 32 with different lengths in the protruding direction, so as to be able to set a time difference to press the plurality of first portions 142A arranged in the slots 112.

[0087] The top surface of the pressing member 32 provided on the pressing jig 3 is not limited to a flat surface perpendicular to the protruding direction. The top surface of the pressing member 32 can also be an inclined surface inclined in the radial direction of the stator core 110, so as to set a time difference in the radial direction to press the plurality of first portions 142A in the slots 112.

[0088] The coil 120 can also be wound around the teeth 122 or the spools. In addition, the coil 120 is not limited to a flat wire.

[0089] Regarding the above embodiments, the following remarks are also disclosed.

[0090] (Remark 1) The coil separation method of the present invention is used to separate the coil (120) from the stator (100), the stator (100) having a stator core (110) with a plurality of slots (112) formed on its inner peripheral surface and coils (120) installed in the plurality of slots. This coil separation method includes a cutting process and a separation process. In the cutting process, the part of the coil protruding from the end face of the stator core, that is, the coil end (130), is cut; in the separation process, in a state where the teeth (122) between the slots in the stator core are supported by the support member (10), the cut part of the coil is pressed by the pressing member (32) to separate the coil from the stator core.

[0091] (Remark 2) According to the coil separation method described in Appendix 1, it is also possible that the coil has a plurality of segmented conductors (140), the segmented conductors (140) have a pair of legs (142) and a turning portion (144) connecting the pair of legs, the legs have a first portion (142A) inserted into the slot, a second portion (142B) protruding from one end face of the stator core, i.e., the first end face (F10), and a third portion (142C) protruding from the other end face of the stator core, i.e., the second end face (F20). The coil end portion protruding from the first end face, i.e., the first coil end portion (131), is constituted by the second portions of the pair of legs respectively, and the coil end portion protruding from the second end face, i.e., the second coil end portion (132), is constituted by the third portions of the pair of legs respectively and the turning portion. In the cutting process, both the first coil end portion and the second coil end portion are cut. In the separation process, in a state where the teeth are supported by the support member on the first end face, the cutting portion of the second coil end portion is pressed by the pressing member.

[0092] (Appendix 3) The coil separation device of the present invention is a coil separation device (1) for separating a coil from a stator. The stator has a stator core with a plurality of slots formed on its inner peripheral surface and the coil installed in the plurality of slots. The coil separation device has a support member and a pressing member. Among them, the support member supports the teeth located between the slots in the stator from which the coil end portion has been cut off. The coil end portion refers to the portion of the coil protruding from the end face of the stator core; the pressing member presses the cutting portion of the coil in a state where the teeth are supported, and separates the coil from the stator core.

[0093] (Appendix 4) According to the coil separation device described in Appendix 3, it is also possible that the coil has a plurality of segmented conductors, the segmented conductors have a pair of legs and a turning portion connecting the pair of legs, the legs have a first portion inserted into the slot, a second portion protruding from one end face of the stator core, i.e., the first end face, and a third portion protruding from the other end face of the stator core, i.e., the second end face. The coil end portion protruding from the first end face, i.e., the first coil end portion, is constituted by the second portions of the pair of legs respectively, and the coil end portion protruding from the second end face, i.e., the second coil end portion, is constituted by the third portions of the pair of legs respectively and the turning portion. The support member supports the teeth in the stator from which both the first coil end portion and the second coil end portion have been cut off on the first end face, and the pressing member presses the cutting portion of the second coil end portion.

[0094] (Appendix 5) According to the coil separation device described in Supplementary Note 3 or 4, it is also possible that the supporting member supports the teeth on the end face and supports the outer peripheral portion of the stator core on the end face.

[0095] (Supplementary Note 6) According to the coil separation device described in Supplementary Note 3 or 4, it is also possible that the supporting member has a circular tubular outer supporting portion (14) and a cylindrical inner supporting portion (16). The inner supporting portion (16) is located inside the outer supporting portion in a state separated from the outer supporting portion. On the outer peripheral surface of the inner supporting portion, a plurality of recesses (24) are formed at intervals in the circumferential direction of the inner supporting portion. The plurality of recesses extend from the one end face of the inner supporting portion in a direction along the axis of the inner supporting portion. The teeth abut against the convex portions (26) defined by the recesses, and the outer peripheral portion of the stator core abuts against the outer supporting portion.

[0096] (Supplementary Note 7) According to the coil separation device described in Supplementary Note 6, it is also possible that a positioning portion (28) for positioning the radial position of the stator core is provided on the one end face of the inner supporting portion.

[0097] (Supplementary Note 8) According to the coil separation device described in Supplementary Note 7, the positioning portion has a circumferential side face (F28) facing the top face (F122) of the teeth in a state of supporting the teeth.

[0098] (Supplementary Note 9) According to the coil separation device described in Supplementary Note 6, a marking portion (30) is provided on the supporting member, and the marking portion (30) is used to align the phase of the stator core with the supporting member.

[0099] The present invention has been described in detail, but the present invention is not limited to the above-described respective embodiments. These embodiments can be subjected to various additions, replacements, changes, partial deletions, etc. within the scope of not departing from the gist of the present invention or within the scope of not departing from the gist of the present invention derived from the content described in the technical solution and its equivalents. In addition, 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 an example, but are not limited thereto. In addition, the same applies when numerical values or mathematical formulas are used in the description of the above-described embodiments.

Claims

1. A coil separation method for separating a coil from a stator, wherein the stator has a stator core with a plurality of slots formed in its inner peripheral surface and the coil mounted in the plurality of slots, characterized in that, it includes a cutting process and a separation process, in the cutting process, the part of the coil protruding from the end face of the stator core, i.e., the coil end, is cut; in the separation process, in a state where the teeth between the slots in the stator core are supported by a support member, the cut part of the coil is pressed by a pressing member to separate the coil from the stator core.

2. The coil separation method according to claim 1, characterized in that, the coil has a plurality of segmented conductors, the segmented conductors have a pair of legs and a turning part connecting the pair of legs, the legs have: a first part inserted into the slot; a second part protruding from one end face of the stator core, i.e., the first end face; and a third part protruding from the other end face of the stator core, i.e., the second end face, the coil end protruding from the first end face, i.e., the first coil end, is composed of the respective second parts of the pair of legs, and the coil end protruding from the second end face, i.e., the second coil end, is composed of the respective third parts of the pair of legs and the turning part, in the cutting process, both the first coil end and the second coil end are cut, in the separation process, in a state where the teeth are supported by the support member on the first end face, the cut part of the second coil end is pressed by the pressing member.

3. A coil separation device for separating a coil from a stator, wherein the stator has a stator core with a plurality of slots formed in its inner peripheral surface and the coil mounted in the plurality of slots, characterized in that, it has a support member and a pressing member, wherein, the support member supports the teeth between the slots in the stator from which the coil end has been cut off, and the coil end refers to the part of the coil protruding from the end face of the stator core; the pressing member presses the cut part of the coil in a state where the teeth are supported to separate the coil from the stator core.

4. The coil separation device according to claim 3, characterized in that, the coil has a plurality of segmented conductors, the segmented conductors have a pair of legs and a turning part connecting the pair of legs, the legs have: a first part inserted into the slot; a second part protruding from one end face of the stator core, i.e., the first end face; and a third part protruding from the other end face of the stator core, i.e., the second end face, the coil end protruding from the first end face, i.e., the first coil end, is composed of the respective second parts of the pair of legs, and the coil end protruding from the second end face, i.e., the second coil end, is composed of the respective third parts of the pair of legs and the turning part, the support member supports the teeth in the stator from which both the first coil end and the second coil end have been cut off on the first end face, the pressing member presses the cut part of the second coil end.

5. The coil separation device according to claim 3 or 4, characterized in that the supporting member supports the teeth on the end face and supports the outer peripheral portion of the stator core on the end face.

6. The coil separation device according to claim 3 or 4, characterized in that the supporting member has a circular tubular outer supporting portion and a cylindrical inner supporting portion, wherein the inner supporting portion is located inside the outer supporting portion in a state separated from the outer supporting portion, on the outer peripheral surface of the inner supporting portion, a plurality of concave portions are formed at intervals in the circumferential direction of the inner supporting portion, the plurality of concave portions extend from one end face of the inner supporting portion in a direction along the axis of the inner supporting portion, the teeth are in contact with the convex portions defined by the concave portions, the outer peripheral portion of the stator core is in contact with the outer supporting portion.

7. The coil separation device according to claim 6, characterized in that a positioning portion for positioning the radial position of the stator core is provided on the one end face of the inner supporting portion.

8. The coil separation device according to claim 7, characterized in that the positioning portion has a circumferential side surface facing the top surface of the teeth in a state where the teeth are supported.

9. The coil separation device according to claim 6, characterized in that a marking portion is provided on the supporting member, and the marking portion is used to align the phase of the stator core with the supporting member.

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