Coil separation method and coil separation device

Abstract

To provide a separation method for easily separating a coil from a stator.SOLUTION: A coil separation method is the method for separating a coil from a stator 100 including a stator core 110 in which a plurality of slots 112 is formed on an inner peripheral face and coils 120 mounted on the plurality of slots 112. The coil separation method includes: a cutting step for cutting a coil end part being a portion projecting from an end face of the stator core 110 in the coil 120; and a separation step for depressing a cut portion of the coil 120 by a depression member 32 in a state in which teeth positioned between the slots 112 of the stator core 110 are supported by a support member 10 and separating the coil 120 from the stator core 110.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present disclosure relates to a coil separation method and a coil separation device. [Background technology]

[0002] In recent years, from the viewpoint of global environmental conservation, attempts have been made to recycle used stators of rotating electrical machines by separating the coils from the stators, rather than discarding them.

[0003] Conventionally, a known method for separating a coil from a stator involves pressing the coil end portions protruding from both end faces of the stator core in the central axis direction toward the radially inward direction of the stator core, and removing the coil from the axial hole of the stator core (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-13222 Summary of the Invention [Problem to be solved by the invention]

[0005] In particular, coils used in stators of automotive rotating electric machines have a higher coil density than coils used in stators of rotating electric machines for home appliances, and the coils are bonded together using varnish or the like. Therefore, when forcibly deforming the coil, it is necessary to apply a strong force to the outer surface of the coil end portion. Since the pressing must be performed at multiple positions around the circumference of the annular coil end portion, large presses must be placed at multiple positions around the circumference of the stator, which inevitably increases the size of the separation device. Furthermore, because a large force is required to separate the coil from the stator, it is difficult to remove the coil by pulling it out along the central axis.

[0006] Furthermore, the method of forcibly deforming the outer surface of the coil end by strongly pressing it is prone to the adhesion of impurities other than the coil to the coil surface. If impurities adhere to the coil, when the coil is removed from the stator and melted for recycling, the impurity concentration in the melt increases, which may limit the scope of coil recycling.

[0007] Therefore, there is a need for a method for easily separating the coil from the stator without forcibly deforming the coil.

[0008] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0009] A first aspect of the present disclosure is a coil separation method for separating coils from a stator having a stator core having a plurality of slots formed on its inner circumferential surface and coils mounted in a plurality of the slots, the coil separation method including: a cutting step for cutting a coil end portion of the coil that protrudes from an end face of the stator core; and a separation step for pressing the cut portion of the coil with a pressing member while teeth located between the slots of the stator core are supported by a support member, thereby separating the coil from the stator core.

[0010] A second aspect of the present disclosure is a coil separation device that separates the coils from a stator that includes a stator core having a plurality of slots formed on its inner circumferential surface and coils mounted in a plurality of the slots, the coil separation device comprising: a support member that supports teeth located between the slots of the stator in which coil end portions, which are portions of the coils that protrude from the end face of the stator core, have been cut; and a pressing member that presses the cut portions of the coils while the teeth are supported, thereby separating the coils from the stator core. [Effects of the Invention]

[0011] According to the aspects of the present disclosure, there is no need to press the outer surface of the coil end portion to forcibly deform it. Therefore, the amount of impurities contained in the coil separated from the stator core is not increased, and there is no risk of limiting the range of coil recycling. Moreover, the coil within the slot can be smoothly moved 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. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a stator. [Figure 2] FIG. 2 is a diagram showing a segment conductor. [Figure 3] FIG. 3 is a schematic diagram showing a coil separation device. [Figure 4] FIG. 4 is a perspective view showing the arrangement jig. [Figure 5] FIG. 5 is a diagram showing a state in which a stator in which both the first coil end portion and the second coil end portion have been cut is supported by a support member. [Figure 6] FIG. 6 is a bottom view showing the pressing jig. [Figure 7] FIG. 7 is a diagram showing the cutting process. [Figure 8] FIG. 8 is a diagram showing a state in which a stator is disposed in the coil separation device. [Figure 9] FIG. 9 is a diagram illustrating the pressing step. [Figure 10] FIG. 10 is a diagram showing a state in which the coil is separated from the stator core. [Figure 11] FIG. 11 is a diagram showing a state in which the pressing jig is returned to its initial position. DETAILED DESCRIPTION OF THE INVENTION

[0013] 1 is a perspective view of a stator 100. The stator 100 has a stator core 110 and a coil 120.

[0014] Here, the directions shown in the drawings will be explained. The X1-X2 direction is a 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, which will be described later. In each drawing, the X1 direction indicates the upward direction, and the X2 direction indicates the downward direction. However, the X1-X2 direction is not necessarily limited to the upward and downward directions along the direction of gravity. The X1-X2 direction may also be a direction inclined with respect to the direction of gravity, for example, a horizontal direction.

[0015] The stator core 110 is formed by laminating multiple thin, annular electromagnetic steel sheets that are open at the center. The stator core 110 has an axial hole 111, a first end face F10, and a second end face F20. The axial hole 111 is located at the center of the stator core 110. The first end face F10 faces in the X1 direction along the central axis X of the stator core 110. The second end face F20 faces in the X2 direction along the central axis X of the stator core 110.

[0016] A plurality of slots 112 are formed at equal intervals on the inner peripheral surface of the stator core 110. The slots 112 open in the form of narrow grooves toward the axial hole 111. The slots 112 are also formed linearly in a direction along the central axis X of the stator core 110. The slots 112 penetrate the stator core 110 and open to a first end face F10 and a second end face F20, respectively.

[0017] A plurality of through holes 113 are formed in the stator core 110, penetrating in a 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 six, but is not limited to this.

[0018] The stator core 110 has a core body 121 and a plurality of teeth 122. The core body 121 is an outer peripheral portion of the stator core 110. The teeth 122 are portions 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.

[0019] The coil 120 is an assembly of conductors made up of multiple rectangular wires. More specifically, the coil 120 is an assembly of multiple segment conductors 140. Each of the multiple segment conductors 140 constituting the coil 120 is attached to a corresponding slot 112 of the stator core 110. The coil 120 has two coil end portions 130 protruding from the end faces of the stator core 110. One of the two coil end portions 130 is a first coil end portion 131 protruding from a first end face F10, which is one end face of the stator core 110. The other of the two coil end portions 130 is a second coil end portion 132 protruding from a second end face F20, which is the other end face of the stator core 110.

[0020] A plurality of segment conductors 140 are connected to form the coil 120. FIG.

[0021] The segment conductor 140 includes a pair of legs 142 and a turn portion 144 connecting the pair of legs 142. The legs 142 of the segment conductor 140 are inserted into the slots 112. The legs 142 have a first portion 142A located within the slot 112, a second portion 142B protruding from the first end face F10, and a third portion 142C protruding from the second end face F20. Multiple legs 142 are inserted into one slot 112. The multiple legs 142 inserted into one slot 112 are legs 142 of different segment conductors 140. The first portion 142A is covered with insulating paper 150. More specifically, the multiple first portions 142A located in one slot 112 are divided into several sets by insulating paper 150, and the first portions 142A of each set are covered by insulating paper 150 (see FIG. 5).

[0022] The first coil end portion 131 is formed by a second portion 142B of the leg portion 142. The second coil end portion 132 is formed by a third portion 142C of the leg portion 142 and the turn portion 144. A welded portion 160 is provided in the first coil end portion 131. One segment conductor 140 and another segment conductor 140 are connected at the welded portion 160. Note that the second coil end portion 132 is not provided with the welded portion 160.

[0023] The segment conductor 140 is formed with a straight portion 170 (see FIG. 2) that extends in a direction along the central axis X of the stator core 110. The straight portion 170 is located in the first portion 142A, a root portion 171 of the first coil end portion 131, and a root portion 172 of the second coil end portion 132. The length of the portion of the straight portion 170 that is located at the root portion 171 of the first coil end portion 131 is shorter than the length of the portion of the straight portion 170 that is located at the root portion 172 of the second coil end portion 132. The reason for this is due to the method of forming the segment conductor 140.

[0024] That is, the segment conductors 140 made of U-shaped conductors (rectangular wires) are inserted into the slots 112 from the second end face F20 of the stator core 110, and the conductors protruding from the first end face F10 of the stator core 110 are bent so as to be close to each other. Thereafter, the close portions of the segment conductors 140 are welded to form the first coil end portion 131 (the second portion 142B of the leg portion 142). When the segment conductors 140 are bent, they tend 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 portion 171 of the first coil end portion 131 is relatively short.

[0025] In this embodiment, after both the first coil end portion 131 and the second coil end portion 132 of the coil 120 provided in the stator 100 as described above are cut, the coil 120 is separated from the stator core 110.

[0026] Next, the coil separating apparatus 1 will be described with reference to Fig. 3 to Fig. 6. The coil separating apparatus 1 has an arrangement jig 2 and a pressing jig 3.

[0027] 3 and 4, the arrangement jig 2 has a support member 10 that supports the stator 100 from which the first coil end portion 131 and the second coil end portion 132 have been cut. The support member 10 may be fixed to a predetermined position on the coil separation device 1. Alternatively, the support member 10 may be placed at a predetermined position on the coil separation device 1 by the operation of a moving mechanism such as a robot hand or slide table (not shown) during the coil separation operation.

[0028] The support member 10 is made of a metal such as stainless steel. 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 perpendicular to the axis of the support member 10.

[0029] The support member 10 has a disk-shaped base portion 12, a cylindrical outer support portion 14, and a cylindrical inner support portion 16. The base portion 12, outer support portion 14, and inner support portion 16 may be formed integrally or separately. When the base portion 12, outer support portion 14, and inner support portion 16 are formed separately, the base portion 12, outer support portion 14, and inner support portion 16 are joined by welding or the like.

[0030] The outer support portion 14 and the cylindrical inner support portion 16 are fixed to the end surface of the base portion 12. The base portion 12 is provided at a predetermined position in the coil separating device 1. Note that the support member 10 does not necessarily have to have the base portion 12. In this case, the outer support portion 14 and the cylindrical inner support portion 16 are provided at a predetermined position in the coil separating device 1.

[0031] A plurality of support post insertion holes 20 are formed in the outer support part 14. The plurality of support post 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 support post insertion holes 20 are holes for installing straight rod-shaped guide posts 5 (see FIG. 8) when separating the coil 120 from the stator 100. The support post insertion holes 20 extend from one end face of the outer support part 14 in a direction along the axis of the outer support part 14. The one end face of the outer support part 14 is included in the support surface F30 of the support member 10. The axis of the outer support part 14 coincides with the axis of the support member 10.

[0032] The core body 121 of the stator 100, from which both the first coil end portion 131 and the second coil end portion 132 have been cut, is in contact with one end surface of the outer support portion 14. More specifically, the core body 121 of the stator core 110 is in contact with the one end surface of the outer support portion 14 at the first end face F10.

[0033] The inner support portion 16 is located inside the outer support portion 14 while being spaced apart from the outer support portion 14. A gap 22 between the inner support portion 16 and the outer support portion 14 allows the coil 120 extruded from the stator core 110 to pass through. The gap 22 extends from the support surface F30 of the support member 10 along the axis of the support member 10 and reaches the other end F40 ( FIG. 3 ) of the outer support portion 14. The gap 22 is surrounded by the inner support portion 16, the outer support portion 14, and the base portion 12. Therefore, the inner support portion 16 can accommodate the coil 120 extruded from the stator core 110.

[0034] A plurality of recesses 24 are formed on the outer peripheral surface of the inner support part 16 at intervals in the circumferential direction of the inner support part 16 (see FIG. 4). The recesses 24 have the same shape. The recesses 24 extend from one end face of the inner support part 16 in a direction along the axis of the inner support part 16. The one end face of the inner support part 16 is included in the support surface F30 of the support member 10. The axis of the outer support part 14 coincides with the axis of the support member 10.

[0035] An end (lower end) 24E (FIG. 3) of the recess 24 is located between one end of the inner support part 16 (the support surface F30 of the support member 10) and the other end F50 (FIG. 3) of the inner support part 16, but is not limited to this. The end 24E of the recess 24 may reach the other end F50 of the inner support part 16.

[0036] The protrusions 26 are defined by the recesses 24 that are adjacent in the circumferential direction of the inner support portion 16. In other words, in a plan view along the central axis X, the inner support portion 16 is formed in a gear shape (see FIG. 4). The number of the protrusions 26 is the same as the number of the teeth 122, but is not limited to this. The number of the protrusions 26 may 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 protrusions 26 are arranged point-symmetrically with respect to the axis of the inner support portion 16.

[0037] Teeth 122 of stator 100, from which both first coil end portion 131 and second coil end portion 132 have been cut, come into contact with protrusions 26. Fig. 5 is a diagram showing a state in which stator 100, from which both first coil end portion 131 and second coil end portion 132 have been cut, is supported by support member 10.

[0038] As shown in Fig. 5, the tip portions of the teeth 122 of the stator core 110 abut against the protrusions 26 at the first end face F10 (see Fig. 1). The area of the portions of the protrusions 26 with which the teeth 122 abut is set based on the volume of the coils 120. The width of the recesses 24 in the circumferential direction of the inner support portion 16 is greater than the width of the slots 112 in the circumferential direction of the stator core 110. The width of the protrusions 26 in the circumferential direction of the inner support portion 16 is smaller than the width of the teeth 122 in the circumferential direction of the stator core 110.

[0039] As shown in Figures 3 to 5, the support member 10 may have, in addition to the disk-shaped base portion 12, the cylindrical outer support portion 14, and the cylindrical inner support portion 16, a positioning portion 28 for determining the radial position of the stator core 110.

[0040] As shown in FIGS. 3 and 4 , the positioning portion 28 is provided on one end surface of the inner support portion 16. This end surface of the inner support portion 16 is included in the support surface F30 of the support member 10. The positioning portion 28 may be formed integrally with the inner support portion 16 or may be formed separately from the inner support portion 16. When the positioning portion 28 is formed separately 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 to this. The positioning portion 28 protrudes beyond the support surface F30 of the support member 10 and has a peripheral side surface F28 that extends in a direction along the circumferential direction of the inner support portion 16. The peripheral side surface F28 of the positioning portion 28 extends in a direction along the axis of the inner support portion 16.

[0041] As shown in FIG. 5 , the circumferential side surface F28 of the positioning portion 28 is located between the tip surface F26 of the protrusion 26 and the bottom surface F24 of the recess 24 in a plan view along the central axis X. In other words, the bottom surface F24 of the recess 24 is located inside the circumferential side surface F28 of the positioning portion 28. When the teeth 122 are supported by the protrusions 26 of the inner support portion 16, the positioning portion 28 is located inside the stator core 110, and the circumferential side surface F28 of the positioning portion 28 faces the tip surface F122 of the teeth 122. The circumferential side surface F28 of the positioning portion 28 abuts against the tip surface F122 of the teeth 122, but this is not a limitation. A slight gap may be formed between the circumferential side surface F28 of the positioning portion 28 and the tip surface F122 of the teeth 122. This gap is narrower than the distance between the protrusion 26 and the inner wall surface 112a of the slot 112.

[0042] As shown in FIG. 4, the support member 10 may have, in addition to the disk-shaped base portion 12, the cylindrical outer support portion 14, and the cylindrical inner support portion 16, an index portion 30 for aligning the phase of the stator core 110 relative to the support member 10.

[0043] The indicator portions 30 are, but are not limited to, a plurality of notches formed in the positioning portion 28 at equal intervals in a direction along the circumferential direction of the inner support portion 16. For example, the indicator portions 30 may be marks provided on the surface of the positioning portion 28. Alternatively, the indicator portions 30 may be marks provided on one end face of the outer support portion 14.

[0044] 3 and 6, the pressing jig 3 is a jig for pressing the coils 120 out of the slots 112 of the stator core 110. The pressing jig 3 has a disk-shaped jig base plate 31 and a plurality of pressing members 32.

[0045] The jig substrate 31 and the multiple pressing members 32 are formed from a metal such as stainless steel. The jig substrate 31 and the multiple pressing members 32 may be formed integrally or separately. When the jig substrate 31 and the multiple pressing members 32 are formed separately, the jig substrate 31 and the multiple pressing members 32 are joined by welding or the like. The jig substrate 31 and the multiple pressing members 32 are arranged in predetermined positions in the coil separation device 1.

[0046] The jig substrate 31 is attached to a press device that is linearly operated by a cylinder or the like (not shown). The jig substrate 31 is configured to be linearly movable along the central axis X of the stator 100. The jig substrate 31 has a plurality of support post through holes 33 formed at equal intervals along the circumferential direction. The plurality of support post through holes 33 are holes through which the guide posts 5 are inserted when separating the coil 120 from the stator 100. The plurality of support post through holes 33 are provided at positions corresponding to the positions of the plurality of through holes 113 formed in the stator core 110.

[0047] The multiple pressing members 32 are fixed to the jig substrate 31 so as to protrude in the same direction from the jig substrate 31. The multiple pressing members 32 are arranged radially at equal intervals around the central axis X of the jig substrate 31. The pressing members 32 all have the same length in the protruding direction. The dimension of the pressing members 32 in the direction along the central axis X is equal to or greater than the dimension of the slots 112 in the direction along the central axis X. The dimension of the pressing members 32 in the radial direction of the jig substrate 31 is smaller than the dimension of the slots 112 in the radial direction of the stator core 110. The normal direction of the tip surface of the pressing members 32 coincides with the protruding direction (longitudinal direction) of the pressing members 32. The tip surface of the pressing members 32 is formed flat.

[0048] The number and arrangement of the pressing members 32 correspond to the number and arrangement of the slots 112 of the stator core 110. When the pressing members 32 are cut in a direction perpendicular to the direction of the central axis X of the jig substrate 31, the cross-sectional shapes of the pressing members 32 are identical. The cross-sectional shape of the pressing members 32 is slightly smaller than the opening shapes of the slots 112 that open to the first end face F10 and the second end face F20 of the stator core 110. Therefore, the pressing members 32 can be inserted into the corresponding slots 112.

[0049] At least during the coil separation operation, the coil separation device 1 arranges the arrangement jig 2 and the pressing jig 3 coaxially along the central axis X, as shown in Fig. 3. At least one of the arrangement jig 2 and the pressing jig 3 is provided so as to be rotatable about its own central axis X by the operation of a rotation mechanism (not shown). Such a rotation mechanism is provided in the coil separation device 1.

[0050] Next, a coil separation method using the coil separation device 1 will be described with reference to FIGS.

[0051] First, as shown in Fig. 7, the two coil end portions 130 (first coil end portion 131, second coil end portion 132) of the stator core 110 are cut using a cutting device 4 having a rotary blade 41. The rotary blade 41 cuts the coil end portions 130 from the outer or inner peripheral side of the coil end portions 130 along cutting lines CL that are parallel to the end faces (first end face F10, second end face F20) of the stator core 110. In this manner, the coil end portions 130 are separated.

[0052] The cutting line CL is set at a position close to the end faces (first end face F10, second end face F20) of the stator core 110. Specifically, the cutting line CL is set at a root portion 171 of the first coil end portion 131 and a root portion 172 of the second coil end portion 132. When the two coil end portions 130 are cut, the coils 120 remaining in the stator 100 are generally straight.

[0053] 8, the stator 100 from which both the first coil end portion 131 and the second coil end portion 132 have been cut is transported to a predetermined position in the coil separation device 1 by the operation of a transport device such as a robot hand (not shown). More specifically, the stator 100 is placed between the placement jig 2 and the pressing jig 3 with the first end face F10 of the stator core 110 facing the placement jig 2 and the second end face F20 of the stator core 110 facing the pressing jig 3.

[0054] When stator 100 is disposed, guide pillars 5 are inserted into each of the plurality of pillar insertion holes 20 of support member 10. The guide pillars 5 inserted into the pillar insertion holes 20 protrude in the normal direction of the support surface F30 of support member 10. The guide pillars 5 may be provided in the pillar insertion holes 20 in advance.

[0055] The stator 100 is positioned relative to the support member 10 by inserting the guide posts 5 into each of the multiple through holes 113. In the positioned state, the stator 100 is moved toward the support member 10 along the guide posts 5 by the operation of a transport device (not shown). Thereafter, the first end face F10 of the stator core 110 abuts against the support surface F30 of the support member 10.

[0056] As shown in Fig. 9, when the first end face F10 of the stator core 110 is in contact with the support surface F30 of the support member 10, the outer support portion 14 of the support member 10 supports the core body 121. Also, as shown in Fig. 5, a plurality of protrusions 26 formed on the inner support portion 16 of the support member 10 each support a tooth 122. The support member 10 is provided with an index portion 30 for aligning the phase of the stator core 110 with respect to the support member 10. This makes it possible to check whether there is any misalignment between the protrusions 26 and the teeth 122.

[0057] When 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 on one end face of the inner support portion 16 abuts against the tip 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 recessed portion 24 between the protruding portions 26, away from the circumferential side face F28 of the positioning portion 28.

[0058] After the first end face F10 of the stator core 110 is brought into contact with the support surface F30 of the support member 10, at least one of the arrangement jig 2 and the pressing jig 3 is rotated around the central axis X by the operation of a rotation mechanism (not shown). In this way, the coil separation device 1 aligns the phases of the multiple pressing members 32 provided on the pressing jig 3 with the multiple slots 112 formed in the stator core 110. As a result, the positions of the multiple slots 112 and the positions of the multiple pressing members 32 coincide along the central axis X of the stator 100.

[0059] After the phase adjustment, the pressing jig 3 is moved in the X2 direction toward the stator 100 by the operation of a press device (not shown). In response to this movement, the multiple guide posts 5 penetrating the stator 100 are inserted into the post through-holes 33, thereby positioning the pressing jig 3 relative to the stator 100.

[0060] As the pressing jig 3 moves further in the X2 direction toward the stator 100, as shown in Fig. 9, the tips of the pressing members 32 come into contact with the cut portions that slightly protrude from the slots 112 on the second end face F20 of the stator core 110. These cut portions are the root portions 172 of the second coil end portions 132 (Fig. 7).

[0061] 5, when the pressing jig 3 moves further in the X2 direction, each pressing member 32 simultaneously presses the first portion 142A of the coil 120 in the corresponding slot 112 in the X2 direction. As a result, the coil 120 gradually moves toward the support member 10 relative to the stator core 110. Because the support member 10 supports the core body 121 and the teeth 122 at the first end face F10 of the stator core 110, the pressing jig 3 can stably press the coil 120 of the stator 100.

[0062] As shown in Fig. 7, the length of the portion of straight portion 170 located at root region 171 of first coil end portion 131 is shorter than the length of the portion of straight portion 170 located at root region 172 of second coil end portion 132. Therefore, when cutting root region 171 of first coil end portion 131, the bent portion may be cut by rotary blade 41 (see Fig. 7). In this case, even after cutting, the portion of root region 171 connected to first region 142A of coil 120 overlaps with stator core 110 in the direction of central axis X of stator core 110. Therefore, as coil 120 moves toward support member 10, it gets caught on stator core 110, increasing the load on pressing jig 3.

[0063] In this embodiment, the cutting portion is pressed against the root portion 172 of the second coil end portion 132, not the root portion 171 of the first coil end portion 131. This makes it possible to prevent the coil 120 from getting caught on the stator core 110 moving toward the support member 10. As a result, it is possible to prevent the load on the pressing jig 3 from increasing excessively.

[0064] 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 shown in FIG. 5 , in the inner support portion 16 of the support member 10, the protrusions 26 support the central tip portions of the teeth 122. Both the protrusions 26 and the recesses 24 are spaced apart from the inner wall surfaces 112a of the slots 112. Therefore, even if the insulating paper 150 covering the coil 120 moves toward the support member 10, contact between the insulating paper 150 and the inner support portion 16 can be avoided. As a result, an increase in the load on the pressing jig 3 due to contact of the insulating paper 150 with the support member 10 can be suppressed.

[0065] One end surface of the inner support portion 16 is provided with a positioning portion 28 for radially positioning the stator core 110. The positioning portion 28 has a circumferential side surface F28 that faces the tip surfaces F122 of the teeth 122 supported on the support surface F30 of the support member 10. This makes it possible to prevent the stator core 110 from being misaligned with the support member 10. Therefore, the coil 120 and the insulating paper 150 covering the first portion 142A of the coil 120 can be guided in a direction along the central axis X of the stator core 110.

[0066] 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 shown in Fig. 10 , when the jig base plate 31 of the pressing jig 3 moves until it abuts 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. Therefore, the coil 120 is pushed out of the slot 112 of the stator core 110 in one go.

[0067] 11, the pressing jig 3 moves in the X1 direction so as to move away from the arrangement jig 2. As a result, the pressing jig 3 returns to its initial position, and the separation operation is completed.

[0068] The above-described coil separation method and coil separation device 1 separate the coil 120 from the stator core 110 by pressing the cut portion of the coil 120 with the pressing member 32 while the teeth 122 are supported by the support member 10. This eliminates the need to press the outer surface of the coil end portion 130 to forcibly deform it. This prevents the amount of impurities contained in the coil 120 separated from the stator core 110 from increasing, and there is no risk of limiting the range of recycling of the coil 120. Furthermore, the coil 120 can be smoothly moved within the slot 112 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 forcibly deforming the coil 120.

[0069] The above embodiment may be modified as follows.

[0070] The guide support 5 may be inserted through the arrangement jig 2 and the stator 100, but may not be inserted through the pressing jig 3. Alternatively, the guide support 5 may not be provided.

[0071] The protrusion 26 of the support member 10 may extend along the radial direction of the stator core 110 and be connected to the outer support portion 14 .

[0072] Alternatively, although not shown, the support member 10 may have a first biasing support portion and a second biasing support portion instead of the base portion 12, the outer support portion 14, and the inner support portion 16. The first biasing support portion biases the tip surface F122 of one or more of the multiple teeth 122 toward the outside of the stator core 110. The second biasing support portion biases the tip surface F122 of the tooth 122 opposite to the tooth 122 biased by the first biasing support portion toward the outside of the stator core 110.

[0073] Alternatively, although not shown, the support member 10 may have radial support portions instead of the base portion 12, the outer support portion 14, and the inner support portion 16. The radial support portions extend radially in correspondence with the plurality of teeth 122 of the stator core 110, and support the teeth 122 on the first end face F10 of the stator core 110.

[0074] The coil separation device 1 may be configured to prepare multiple types of pressing jigs 3 having pressing members 32 of sizes and numbers corresponding to the size of the stator 100, the number of slots 112 in the stator core 110, etc., and to select and use the most appropriate pressing jig 3 depending on the type of stator 100 to be separated.

[0075] The number of pressing members 32 provided on the pressing jig 3 is not limited to the same as the number of slots 112 in the stator core 110. The pressing members 32 may be any number that presses the coils 120 in any of the slots 112 formed in the stator core 110, and the number of pressing members 32 provided on the jig substrate 31 may be less than the number of slots 112. Note that there may be only one pressing member 32. In this case, the coil separation device 1 alternately repeats the pressing operation and the phase alignment operation. This allows all of the coils 120 located on each of the multiple teeth 122 to be separated from the stator core 110.

[0076] The multiple pressing members 32 provided in the pressing jig 3 are not limited to those having the same length in the protruding direction. The pressing jig 3 may include pressing members 32 having different lengths in the protruding direction so that the multiple first portions 142A arranged in the slot 112 can be pressed at different times.

[0077] The tip surface of the pressing member 32 provided in the pressing jig 3 is not limited to a flat surface perpendicular to the protruding direction. The tip surface of the pressing member 32 may be an inclined surface that is inclined in the radial direction of the stator core 110 so as to press the multiple first portions 142A in the slots 112 in the radial direction with a time lag.

[0078] The coil 120 may be wound around the teeth 122 or a bobbin. The coil 120 is not limited to a rectangular wire.

[0079] The following additional notes are further disclosed regarding the above embodiment.

[0080] (Appendix 1) The coil separation method of the present disclosure is a coil separation method for separating the coils from a stator (100) having a stator core (110) with a plurality of slots (112) formed on its inner circumferential surface and coils (120) mounted in the plurality of slots, and includes a cutting step of cutting coil end portions (130) of the coils that protrude from the end face of the stator core, and a separation step of pressing the cut portions of the coils with a pressing member (32) while teeth (122) located between the slots of the stator core are supported by a support member (10), thereby separating the coils from the stator core.

[0081] (Appendix 2) A coil separation method according to Supplementary Note 1, wherein the coil has a plurality of segment conductors (140) each having a pair of leg portions (142) and a turn portion (144) connecting the pair of leg portions, the leg portions having a first portion (142A) inserted into the slot, a second portion (142B) protruding from a first end face (F10) that is one of the end faces of the stator core, and a third portion (142C) protruding from a second end face (F20) that is the other of the end faces of the stator core, and a first coil that is the coil end portion protruding from the first end face The end portion (131) is formed by the second portions of the pair of leg portions, and the second coil end portion (132), which is the coil end portion protruding from the second end surface, is formed by the third portions and the turn portion of the pair of leg portions, and in the cutting process, both the first coil end portion and the second coil end portion are cut, and in the separation process, the cut portion of the second coil end portion may be pressed by the pressing member while the teeth are supported by the support member on the first end surface.

[0082] (Appendix 3) The coil separation device of the present disclosure is a coil separation device (1) that separates the coils from a stator that includes a stator core having a plurality of slots formed on its inner circumferential surface and coils mounted in the plurality of slots, and includes a support member that supports teeth located between the slots of the stator where the coil end portions, which are portions of the coil that protrude from the end face of the stator core, have been cut off, and a pressing member that presses the cut portions of the coils while the teeth are supported, thereby separating the coils from the stator core.

[0083] (Appendix 4) In the coil separation device described in Supplementary Note 3, the coil has a plurality of segment conductors, each having a pair of legs and a turn portion connecting the pair of legs, the legs having a first portion inserted into the slot, a second portion protruding from a first end face that is one of the end faces of the stator core, and a third portion protruding from a second end face that is the other end face of the stator core, the first coil end portion that is the coil end portion protruding from the first end face being formed by the second portion of each of the pair of legs, and the second coil end portion that is the coil end portion protruding from the second end face being formed by the third portion and the turn portion of each of the pair of legs, the support member may support the tooth of the stator from which both the first coil end portion and the second coil end portion have been cut, at the first end face, and the pressing member may press the cut portion of the second coil end portion.

[0084] (Appendix 5) In the coil separation device according to Supplementary Note 3 or 4, the support member may support the teeth at the end surface and also support an outer circumferential portion of the stator core at the end surface.

[0085] (Appendix 6) In the coil separation device described in Appendix 3 or 4, the support member has a cylindrical outer support portion (14) and a cylindrical inner support portion (16) located inside the outer support portion and spaced apart from the outer support portion, and a plurality of recesses (24) are formed on the outer peripheral surface of the inner support portion at intervals in the circumferential direction of the inner support portion, and the plurality of recesses extend from the one end face of the inner support portion in a direction along the axis of the inner support portion, and the teeth abut against protrusions (26) defined by the recesses, and an outer peripheral portion of the stator core abuts against the outer support portion.

[0086] (Appendix 7) In the coil separation device described in Supplementary Note 6, a positioning portion (28) for positioning the stator core in the radial direction may be provided on the one end surface of the inner support portion.

[0087] (Appendix 8) In the coil separation device according to Supplementary Note 7, the positioning portion may have a peripheral side surface (F28) that faces a tip end surface (F122) of the tooth when the tooth is supported.

[0088] (Appendix 9) In the coil separation device described in Supplementary Note 6, the support member may be provided with an index portion (30) for aligning the phase of the stator core with respect to the support member.

[0089] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values or mathematical expressions are used in the description of the above-described embodiments. [Explanation of symbols]

[0090] 1... Coil separation device 2... Placement jig 3...Pressing jig 10...Support member 12...Basal part 14...Outer support part 16...Inner support portion 24...Recess 26...Protrusion 28...Positioning part 30...Indicator portion 32...Pressing member 100... Stator 110... Stator core 112...Slot 120...Coil 122...Teeth 130...Coil end 131...first coil end portion 132...second coil end portion 142...Leg 142A...First part 142B…Second part 142C…Third part 144...Turn section 150...Insulating paper

Claims

1. A coil separation method for separating coils from a stator including a stator core having a plurality of slots formed in an inner circumferential surface thereof and coils fitted in the plurality of slots, the method comprising: a cutting step of cutting a coil end portion of the coil, the coil end portion being a portion of the coil that protrudes from an end surface of the stator core; a separating step of pressing a cut portion of the coil with a pressing member while teeth of the stator core positioned between the slots are supported by a support member, thereby separating the coil from the stator core; A coil separation method comprising:

2. 2. The coil separation method according to claim 1, the coil includes a plurality of segment conductors each having a pair of legs and a turn portion connecting the pair of legs; the leg portion has a first portion inserted into the slot, a second portion protruding from a first end face that is one of the end faces of the stator core, and a third portion protruding from a second end face that is the other end face of the stator core, a first coil end portion that is the coil end portion protruding from the first end surface is constituted by the second portions of the pair of leg portions, and a second coil end portion that is the coil end portion protruding from the second end surface is constituted by the third portions and the turn portions of the pair of leg portions, In the cutting step, both the first coil end portion and the second coil end portion are cut, In the separating step, the cutting portion of the second coil end portion is pressed by the pressing member while the teeth are supported by the support member at the first end surface.

3. A coil separation device that separates coils from a stator including a stator core having a plurality of slots formed on an inner circumferential surface thereof and coils attached to the plurality of slots, a support member for supporting teeth located between the slots of the stator from which coil end portions, which are portions of the coils that protrude from an end surface of the stator core, have been cut; a pressing member that presses a cut portion of the coil while the teeth are supported, and separates the coil from the stator core; A coil separation device comprising:

4. 4. The coil separation device according to claim 3, the coil includes a plurality of segment conductors each having a pair of legs and a turn portion connecting the pair of legs; the leg portion has a first portion inserted into the slot, a second portion protruding from a first end face that is one of the end faces of the stator core, and a third portion protruding from a second end face that is the other end face of the stator core, a first coil end portion that is the coil end portion protruding from the first end surface is constituted by the second portions of the pair of leg portions, and a second coil end portion that is the coil end portion protruding from the second end surface is constituted by the third portions and the turn portions of the pair of leg portions, the support member supports, at the first end surface, the teeth of the stator from which both the first coil end portion and the second coil end portion have been cut, The pressing member presses the cutting portion of the second coil end portion.

5. The coil separation device according to claim 3 or 4, The support member supports the teeth at the end surfaces and also supports an outer peripheral portion of the stator core at the end surfaces.

6. The coil separation device according to claim 3 or 4, The support member is a cylindrical outer support portion; a cylindrical inner support portion located inside the outer support portion and spaced apart from the outer support portion; and a plurality of recesses are formed in an outer peripheral surface of the inner support portion at intervals in a circumferential direction of the inner support portion, the plurality of recesses extend from one end surface of the inner support portion in a direction along an axis of the inner support portion, The teeth abut against protrusions defined by the recesses, A coil separation device, wherein an outer peripheral portion of the stator core is abutted against the outer support portion.

7. 7. The coil separation device according to claim 6, A coil separation device, wherein the one end surface of the inner support portion is provided with a positioning portion for positioning the stator core in the radial direction.

8. 8. The coil separation device according to claim 7, The positioning portion has a peripheral side surface that faces the tip end surface of the tooth when the tooth is supported.

9. 7. The coil separation device according to claim 6, The support member is provided with an index portion for aligning the phase of the stator core with respect to the support member.

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