Film removal device, film removal method, and motor

Abstract

The invention relates to a film removing device, a film removing method and a motor. A blade tip portion in a punch of a film removal device has a first cut-in start portion, a second cut-in start portion, at least one first blade tip inclined portion, and at least one second blade tip inclined portion in which the tip of a blade tip is inclined with respect to the width direction of a blade body when viewed in the thickness direction. The first cutting start portion and the first blade tip inclined portion are arranged in this order from one end portion to the other end portion in the width direction. The second cutting start portion and the second blade tip inclined portion are arranged in this order from the other end portion to the one end portion in the width direction. When the blade body is observed in the thickness direction, the inclination angle of the tip of the blade tip of the first cut-in starting part relative to the width direction is smaller than the inclination angle of the tip of the blade tip of the first blade tip inclination part relative to the width direction. When the blade body is observed along the thickness direction, the inclination angle of the tip of the blade tip of the second cut-in starting part relative to the width direction is smaller than the inclination angle of the tip of the blade tip of the second blade tip inclination part relative to the width direction.

Description

Technical Field

[0001] The present invention relates to a film removal device, a film removal method, and a motor. Background Art

[0002] A film removal device for removing an insulating film of a wire is known. As such a device, a film peeling device is disclosed in which a punch including a pair of peeling blades extending in parallel with each other moves toward a die, whereby the side surface of a flat wire disposed between the punch and the die is cut, and thus the film on the side surface is peeled off (for example, see Patent Document 1). In the film peeling device, the tips of the pair of peeling blades are formed in a concave shape that is symmetrically recessed from the central portion toward the both end portions. Prior Art Documents Patent Documents

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-115108 Summary of the Invention

[0004] As in the film peeling device, by inclining the tip of the plate-shaped blade body with respect to the width direction, the area of the tip in contact with the wire can be reduced. Thereby, the accuracy of removing the insulating film can be improved.

[0005] On the other hand, in the case of removing the insulating film of a wire by a blade body having a tip inclined with respect to the width direction, compared with a blade body having a tip parallel to the width direction, it is necessary to increase the moving distance for moving the blade body relative to the wire. Therefore, the time required to remove the insulating film becomes longer, and the working efficiency is reduced.

[0006] In addition, in the blade body having a tip inclined with respect to the width direction, the portion of the tip that first contacts the wire receives a reaction force from the wire and is more likely to wear than other portions. Therefore, in the wire, at the boundary between the portion having the insulating film and the portion where the insulating film is removed, the removal accuracy of the insulating film is likely to be reduced. Therefore, there is a demand for a film removal device that can efficiently remove the insulating film and can suppress a reduction in the removal accuracy of the insulating film.

[0007] An object of the present invention is to provide a film removal device that can efficiently remove an insulating film and can suppress a reduction in the removal accuracy of the insulating film.

[0008] A film removal device according to an embodiment of the present invention is a film removal device that removes an insulating film on the side surface of a wire through a punch including a blade body and a die. The punch is movable toward the die. The blade body is in a plate shape having a tip portion at an end on the front side in the moving direction of the punch. The tip portion has: a first cutting start portion, a second cutting start portion, at least one first tip inclination portion, and at least one second tip inclination portion, where the front ends of the tips are inclined with respect to the width direction of the blade body when the blade body is viewed in the thickness direction. The first cutting start portion and the first tip inclination portion are arranged in sequence from one end portion in the width direction of the tip portion to the other end portion. The second cutting start portion and the second tip inclination portion are arranged in sequence from the other end portion in the width direction of the tip portion to the one end portion. When the blade body is viewed in the thickness direction, the inclination angle of the front end of the tip of the first cutting start portion with respect to the width direction is smaller than the inclination angle of the front end of the tip of the first tip inclination portion with respect to the width direction. When the blade body is viewed in the thickness direction, the inclination angle of the front end of the tip of the second cutting start portion with respect to the width direction is smaller than the inclination angle of the front end of the tip of the second tip inclination portion with respect to the width direction.

[0009] A film removal method according to an embodiment of the present invention is a film removal method that removes an insulating film on the side surface of a wire through the film removal device. The film removal method includes: a positioning step of positioning the wire at a position where the tip portion of the blade body in the punch overlaps with the conductor of the wire when viewed in the moving direction of the punch through a positioning portion of the die; and an insulating film removal step of removing a specified range of the insulating film on the side surface of the wire by moving the punch toward the die using the tip portion. The insulating film removal step includes: a first cutting start step of forming a boundary at one end in the length direction of the side surface of the wire in the specified range through the first cutting start portion of the tip portion; a second cutting start step of forming a boundary at the other end in the length direction of the side surface of the wire in the specified range through the second cutting start portion of the tip portion; a first insulating film removal step of removing a portion of the insulating film in the specified range that is located on the side closer to the other end boundary than the one end boundary through the first tip inclination portion of the tip portion; and a second insulating film removal step of removing a portion of the insulating film in the specified range that is located on the side closer to the one end boundary than the other end boundary through the second tip inclination portion of the tip portion.

[0010] A motor according to an embodiment of the present invention includes a stator and a rotor. The stator has a stator core and a plurality of wires. The stator core has a plurality of slots extending in the axial direction. The plurality of wires have conductors and insulating films covering the conductors, and a part of the plurality of wires is received in the plurality of slots. The rotor rotates about the axis of the stator. The wire has: a covered portion where the conductor is covered by the insulating film; an exposed portion where the conductor is exposed; and a stepped portion located between the covered portion and the exposed portion. A boundary portion between the stepped portion and the covered portion extends linearly in a direction orthogonal to the extending direction of the wire.

[0011] According to an embodiment of the present invention, it is possible to provide a film removing device that can efficiently remove the insulating film of a wire and can suppress a decrease in the removal accuracy of the insulating film. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a perspective view showing a schematic structure of a wire. Figure 2 is a view showing a schematic structure of a film removing device according to Embodiment 1. Figure 3 is a view of the film removing device as viewed in the thickness direction of the blade body of the punch. Figure 4 is a perspective view showing a schematic structure of the blade body of the punch. Figure 5 is a view of the die as viewed in the moving direction of the punch. Figure 6 is a view for explaining the relationship between the insertion hole of the die and the tip of the punch. Figure 7 is a view for explaining the position of the blade body relative to the wire. Figure 8 is a view of the tip portion of Embodiment 1 as viewed in the thickness direction of the blade body. Figure 9A is Figure 8 a partial enlarged view of. Figure 9B is Figure 8 a partial enlarged view of. Figure 10A is a view for explaining the form of removing the insulating film of the wire by the blade body. Figure 10B is a view for explaining the form of removing the insulating film of the wire by the blade body. Figure 10C is a view for explaining the form of removing the insulating film of the wire by the blade body. Figure 11 is a view for explaining the relationship between the blade body and the wire. Figure 12 is Figure 11 a partially enlarged view of Figure 13 is a perspective view of a wire with the insulating film removed. Figure 14 is a view of the tip portion of a modified example as observed in the thickness direction of the tool body. Figure 15 is a view of the tip portion of a modified example as observed in the thickness direction of the tool body. Figure 16 is a view of the tip portion of a modified example as observed in the thickness direction of the tool body. Figure 17 is a schematic diagram showing the schematic structure of the motor according to the second embodiment. Figure 18 is a perspective view schematically showing an example of the positional relationship between the stator core and the stator coil. Figure 19 is a partially enlarged view of the stator. Detailed Embodiments

[0013] Hereinafter, with reference to the drawings, exemplary embodiments of the present invention will be described in detail. In addition, the same or corresponding parts in the drawings are denoted by the same reference numerals, and description thereof will not be repeated. Further, the dimensions of the components in each drawing do not faithfully represent the actual dimensions of the components and the dimensional ratios of the components.

[0014] In addition, in the following description, expressions such as "fix", "connect", and "mount" (hereinafter, fix, etc.) include not only cases where components are directly fixed to each other, etc., but also cases where they are fixed via other components. That is, in the following description, the expressions fix, etc. include the meanings of direct and indirect fixing, etc. of components to each other.

[0015] (Embodiment 1) (Structure of the Film Removal Device) Refer to Figures 1 to 9B to describe the film removal device 1 of the exemplary embodiment of the present invention. The film removal device 1 is a device for removing the insulating film 52 covering the side surface of the wire 50. The wire 50 is used, for example, for the stator coil of a motor.

[0016] First, Figure 1 will be used to briefly describe the wire 50. As Figure 1As shown, the wire 50 has a conductor 51 and an insulating film 52. The wire 50 is, for example, a flat wire. That is, the conductor 51 before the insulating film is removed by the film removing device 1 is rectangular when viewed in a cross-section orthogonal to the extending direction. The insulating film 52 covers the side surface of the conductor 51. The insulating film 52 is formed, for example, by applying a resin having insulating properties to the outer peripheral surface of the conductor 51 and sintering it. In addition, the wire may also be a round wire or a square wire.

[0017] The wire 50 has a covering portion 61 whose side surface is covered by the insulating film 52; and an exposed portion 62 whose side surface is not covered by the insulating film 52 and is exposed. The wire 50 is insulated at the covering portion 61 covered by the insulating film 52. The wire 50 is not insulated at the exposed portion 62 where the conductor 51 is exposed. For example, the insulating film 52 of the wire 50 used in a motor is removed at the wire end portion 50a. A plurality of wires 50 are electrically connected by welding the wire end portions 50a to each other, etc.

[0018] The exposed portion 62 is formed by cutting a specified range of the side surface in the extending direction of the wire 50 in the wire 50 having the insulating film 52 formed on the side surface by the film removing device 1. Therefore, the wire 50 has a stepped portion 63 between the covering portion 61 and the exposed portion 62.

[0019] The outer peripheral surface of the stepped portion 63 is composed of an inclined surface inclined with respect to the extending direction of the wire 50. The boundary portion 61a between the stepped portion 63 and the covering portion 61 extends linearly in a direction orthogonal to the extending direction of the wire 50.

[0020] The wire end portion 50a of the wire 50 is obtained by cutting the exposed portion 62 of the wire 50 formed by the film removing device 1 at the central portion in the extending direction of the wire 50.

[0021] (Description of the structure of the die and the punch) Next, Figures 2 to 9B An exemplary film removing device 1 of the present embodiment will be described. The film removing device 1 is a device for removing the insulating film 52 covering the side surface of the wire 50.

[0022] As Figure 2 and Figure 3 shown, the film removing device 1 has a punch 2 and a die 3. The punch 2 moves from a position separated from the die 3 toward the die 3. By moving toward the die 3, the punch 2 contacts the wire 50 placed on the base 3a of the die 3 and removes the insulating film 52 covering the side surface of the wire 50. In the following description, the front in the moving direction Z of the punch 2 indicates the direction in which the punch 2 moves toward the wire 50 placed on the base 3a of the die 3.

[0023] The punch 2 has a pair of cutter bodies 21. The pair of cutter bodies 21 are each in a plate shape. The pair of cutter bodies 21 are arranged in the thickness direction. There is a gap between the pair of cutter bodies 21, and the pair of cutter bodies 21 are arranged in parallel. The end of the cutter body 21 on the front side in the moving direction Z has a tip portion 22. The detailed structure of the tip portion 22 will be described below.

[0024] As Figure 4 shown, in the present embodiment, when observing the cutter body 21 along the moving direction Z, the connecting portion of the surface 21a on one side in the thickness direction of the cutter body 21 and the end faces on both sides in the width direction W has an inclined surface 21b. The angle between the surface 21a on one side in the thickness direction of the cutter body 21 and the end face on the front side in the moving direction Z, and the angle between the inclined surface 21b and the end face on the front side in the moving direction Z have the tip of the cutter. As Figure 2 shown, the surfaces 21a of the pair of cutter bodies 21 face each other.

[0025] As Figure 3 and Figure 5 shown, in the present embodiment, when observing along the moving direction Z of the punch 2, the die 3 is longer in the direction intersecting the arrangement direction of the pair of cutter bodies 21. The wire 50 is placed on the base 3a of the die 3 with the extending direction of the wire 50 being perpendicular to the moving direction Z of the punch 2 and being consistent with the width direction W of the cutter body 21 of the punch 2.

[0026] As Figure 2 and Figure 3 shown, when observing along the moving direction Z of the punch 2, the side portions on both sides of the wire 50 placed on the base 3a overlap with the pair of cutter bodies 21. That is, the wire 50 is positioned at a position where the pair of cutter bodies 21 overlap with the side portions on both sides in the short side direction of the wire 50 when observing along the moving direction Z of the punch 2.

[0027] In addition, the base 3a of the die 3 may not be a plane parallel to the ground. The base of the die may be a plane inclined with respect to the ground or a plane perpendicular to the ground. The base of the die may have irregularities. Figure 5 In, the position of the wire 50 relative to the die 3 is shown by a double-dashed line.

[0028] As Figure 2 and Figure 3 shown, the die 3 has a pair of insertion holes 32 extending along the moving direction Z of the punch 2. The pair of insertion holes 32 are located on both sides in the width direction of the wire 50 when observing along the moving direction Z with respect to the wire 50 placed on the base 3a. As Figure 6 shown, the tip portion 22 of the punch 2 moving forward in the moving direction Z is inserted into the insertion hole 32.

[0029] By moving the punch 2 forward in the moving direction Z, a pair of cutter bodies 21 cut the above-mentioned both side portions of the wire 50. That is, by the pair of cutter bodies 21, the insulating film 52 in the range R that overlaps with the pair of cutter bodies 21 when viewed in the moving direction Z on the side surface of the wire 50 is removed.

[0030] In the present embodiment, the die 3 has a positioning portion 31 for positioning the wire 50. The positioning portion 31 is, for example, a groove portion 31a provided in the base 3a of the die 3. The groove portion 31a extends along the length direction of the die 3. The wire 50 is inserted into the groove portion 31a. Thereby, the wire 50 can be easily positioned at a predetermined position on the base 3a.

[0031] Figure 7 It is a view of the wire 50 positioned on the base 3a of the die 3 and the pair of cutter bodies 21 of the punch 2 when viewed in the moving direction Z. In the present embodiment, the positioning portion 31 positions the wire 50 at a position where the tip portion 22 of the punch 2 overlaps with the conductor 51 of the wire 50 when viewed in the moving direction Z.

[0032] Therefore, by moving the punch 2 forward in the moving direction Z, the insulating film 52 and a part of the conductor 51 included in the portion of the wire 50 that overlaps with the pair of cutter bodies 21 when viewed in the moving direction Z are removed. In this way, the film removing device 1 not only removes the insulating film 52 from the wire 50, but also removes a part of the conductor 51. Thereby, the insulating film 52 can be removed more reliably by the film removing device 1.

[0033] (Shape of the tip portion) With Figures 8 to 9B The shape of the exemplary tip portion 22 of the present embodiment will be described in detail.

[0034] In the present embodiment, the tip portion 22 has: a first cutting start portion 23, a second cutting start portion 24, two first tip inclined portions 25, and two second tip inclined portions 26. In the present embodiment, the first cutting start portion 23, one first tip inclined portion 25, one second tip inclined portion 26, one first tip inclined portion 25, one second tip inclined portion 26, and the second cutting start portion 24 are arranged in sequence from one end portion W1 in the width direction W of the cutter body 21 to the other end portion W2.

[0035] As Figure 9A shown, the tip end 23a of the first cutting start portion 23 is inclined with respect to the width direction W. One end portion W1 side of the tip end 23a of the first cutting start portion 23 is located at a position in front of the other end portion W2 side in the moving direction Z.

[0036] The tip end 25a of the first tip inclined portion 25 is inclined with respect to the width direction W of the tool body 21. One end portion W1 side of the tip end 25a of the first tip inclined portion 25 is located at a position in front of the other end portion W2 side in the moving direction Z.

[0037] The inclination angle D23 of the tip end 23a of the first cutting start portion 23 with respect to the width direction W is smaller than the inclination angle D25 of the tip end 25a of the first tip inclined portion 25 with respect to the width direction W. The inclination angle D23 is, for example, 20 degrees. The inclination angle D25 is, for example, 45 degrees.

[0038] As Figure 9B shown, the tip end 24a of the second cutting start portion 24 is inclined with respect to the width direction W. The other end portion W2 side of the tip end 24a of the second cutting start portion 24 is located at a position in front of the one end portion W1 side in the moving direction Z.

[0039] The tip end 26a of the second tip inclined portion 26 is inclined with respect to the width direction W. The other end portion W2 side of the tip end 26a of the second tip inclined portion 26 is located at a position in front of the one end portion W1 side in the moving direction Z.

[0040] The inclination angle D24 of the tip end 24a of the second cutting start portion 24 with respect to the width direction W is smaller than the inclination angle D26 of the tip end 26a of the second tip inclined portion 26 with respect to the width direction W. The inclination angle D24 is, for example, 20 degrees. The inclination angle D26 is, for example, 45 degrees.

[0041] As Figure 8 shown, in the present embodiment, the length of the first cutting start portion 23 in the width direction W is shorter than the length of the first tip inclined portion 25 in the width direction W. The length of the second cutting start portion 24 in the width direction W is shorter than the length of the second tip inclined portion 26 in the width direction W.

[0042] The film removal device 1 of the embodiment described above is a film removal device 1 that removes the insulating film 52 on the side of the wire 50 through the punch 2 including the cutter body 21 and the die 3. The punch 2 can move toward the die 3. The cutter body 21 is in a plate shape having a cutting edge portion 22 at the front end in the moving direction Z of the punch 2. The cutting edge portion 22 has a first cutting start portion 23, a second cutting start portion 24, at least one first cutting edge inclination portion 25, and at least one second cutting edge inclination portion 26 in which the cutting edge tips 23a, 24a, 25a, 26a are inclined with respect to the width direction W of the cutter body 21 when observing the cutter body 21 in the thickness direction. The first cutting start portion 23 and the first cutting edge inclination portion 25 are arranged in sequence from one end portion W1 to the other end portion W2 in the width direction W of the cutting edge portion 22. The second cutting start portion 24 and the second cutting edge inclination portion 26 are arranged in sequence from the other end portion W2 to the one end portion W1 in the width direction W of the cutting edge portion 22. When observing the cutter body 21 in the above thickness direction, the inclination angle D23 of the cutting edge tip 23a of the first cutting start portion 23 with respect to the width direction W is smaller than the inclination angle D25 of the cutting edge tip 25a of the first cutting edge inclination portion 25 with respect to the width direction W. When observing the cutter body 21 in the above thickness direction, the inclination angle D24 of the cutting edge tip 24a of the second cutting start portion 24 with respect to the width direction W is smaller than the inclination angle D26 of the cutting edge tip 26a of the second cutting edge inclination portion 26 with respect to the width direction W.

[0043] In the film removal device 1 having the above structure, at one end portion W1 in the width direction W of the cutting edge portion 22, one end portion W1 side of the first cutting start portion 23 protrudes toward the die 3 side. Thus, when the punch 2 moves toward the die 3, a cut is formed on the insulating film 52 on the side of the conductor 50 by the cutting edge tip 23a of the first cutting start portion 23. At the other end portion W2 in the width direction W of the cutting edge portion 22, the other end portion W2 side of the second cutting start portion 24 protrudes toward the die 3 side. Thus, when the punch 2 moves toward the die 3, a cut is formed on the insulating film 52 on the side of the conductor 50 by the cutting edge tip 24a of the second cutting start portion 24. The cut formed by the first cutting start portion 23 becomes one boundary R1 in the length direction in the range R of the insulating film 52 removed from the wire 50. The cut formed by the second cutting start portion 24 becomes the other boundary R2 in the length direction in the range R of the insulating film 52 removed from the wire 50.

[0044] In addition, the insulating film 52 on the side of the other boundary R2 with respect to one boundary R1 is removed by the tip end 23a of the tip of the first cutting start portion 23 and the tip end 25a of the tip of the first tool tip inclined portion 25 adjacent to the first cutting start portion 23 in the width direction W. The insulating film 52 on the side of the one boundary R1 with respect to the other boundary R2 is removed by the tip end 24a of the tip of the second cutting start portion 24 and the tip end 26a of the tip of the second tool tip inclined portion 26 adjacent to the second cutting start portion 24 in the width direction W. Thereby, the insulating film 52 can be efficiently removed without increasing the moving distance of the punch 2.

[0045] Moreover, the inclination angle D23 of the tip end 23a of the first cutting start portion 23 with respect to the width direction W is smaller than the inclination angle D25 of the tip end 25a of the first tool tip inclined portion 25 with respect to the width direction W. Thereby, when forming the one boundary R1 and the other boundary R2 at the tip end 23a of the tip of the first cutting start portion 23 and the tip end 24a of the tip of the second cutting start portion 24, the reaction force received from the insulating film 52 can be reduced. Thereby, the wear or deformation of the tip end 23a of the tool tip portion 22 can be suppressed. Therefore, it is possible to suppress a decrease in the removal accuracy of the insulating film 52 at the boundaries R1 and R2 due to wear of the tip end 23a or the like.

[0046] Therefore, it is possible to provide the film removing device 1 that can efficiently remove the insulating film 52 and can suppress a decrease in the removal accuracy of the insulating film 52.

[0047] In the present embodiment, the length of the first cutting start portion 23 in the width direction W is shorter than the length of the first tool tip inclined portion 25 in the width direction W. The length of the second cutting start portion 24 in the width direction W is shorter than the length of the second tool tip inclined portion 26 in the width direction W.

[0048] The tool body having a tool tip inclined with respect to the width direction W cuts the object to be cut in the moving direction of the tool body and also cuts in the width direction of the tool body. Therefore, the larger the inclination angle of the tool tip with respect to the width direction, the smaller the force required to cut the object to be cut. Therefore, the larger the inclination angle, the higher the cutting accuracy.

[0049] Therefore, compared with the first tip inclined portion 25, the removal accuracy of the insulating film 52 is reduced for the first cutting start portion 23 where the inclination angle D23 of the tip front end 23a with respect to the width direction W of the tool body 21 is smaller than the inclination angle D25 at the first tip inclined portion 25. For the second cutting start portion 24 where the inclination angle D24 of the tip front end 24a with respect to the width direction W of the tool body 21 is smaller than the inclination angle D26 at the second tip inclined portion 26, the removal accuracy of the insulating film 52 is reduced compared with the second tip inclined portion 26. In the present embodiment, the range of the insulating film 52 removed by the first cutting start portion 23 and the second cutting start portion 24 is smaller than the range of the insulating film 52 removed by the first tip inclined portion 25 and the second tip inclined portion 26. Therefore, the range where the removal accuracy is reduced is small. Thus, it is possible to suppress a reduction in the removal accuracy of the insulating film 52.

[0050] In the present embodiment, when observing the tool body 21 in the thickness direction, the tip front end 23a of the first cutting start portion 23 is inclined with respect to the width direction W. When observing the tool body 21 in the thickness direction, the tip front end 25a of the first tip inclined portion 25 is inclined with respect to the width direction W at an angle of 45 degrees or more. When observing the tool body 21 in the thickness direction, the tip front end 24a of the second cutting start portion 24 is inclined with respect to the width direction W. When observing the tool body 21 in the thickness direction, the tip front end 26a of the second tip inclined portion 26 is inclined with respect to the width direction W at an angle of 45 degrees or more.

[0051] Thus, compared with the case where the inclination angles of the tip front end 23a of the first cutting start portion 23 and the tip front end 24a of the second cutting start portion 24 with respect to the width direction W are 0, a structure capable of starting the cutting of the insulating film 52 with a small force can be provided. In addition, wear of the tip front end 23a of the first cutting start portion 23 and the tip front end 24a of the second cutting start portion 24 can be suppressed.

[0052] In addition, by setting the inclination angle D25 of the first tip inclined portion 25 and the inclination angle D26 of the second tip inclined portion 26 to 45 degrees or more, it is possible to suppress the speed of removing the insulating film 52 in the width direction W from becoming faster than the moving speed of the punch 2. Thus, it is possible to suppress a reduction in the removal accuracy of the insulating film 52.

[0053] In the present embodiment, the tip portion 22 has additional first tip inclined portions 25 and additional second tip inclined portions 26 that are alternately arranged in the width direction W between the first tip inclined portion 25 adjacent to the first cutting start portion 23 in the width direction W and the second tip inclined portion 26 adjacent to the second cutting start portion 24 in the width direction W.

[0054] Accordingly, the distance that the punch 2 moves in the moving direction Z to remove the insulating film 52 can be reduced. Therefore, a structure can be provided that can efficiently remove the insulating film 52 and can suppress a reduction in the removal accuracy of the insulating film 52.

[0055] (Film removal method based on the film removal device) Next, with reference to Figure 8 and Figures 10A to 13 , a film removal method according to an exemplary embodiment of the present invention will be described. The film removal method is a method of removing the insulating film 52 on the side surface of the wire 50 by the film removal device 1 having the above-described structure. In addition, in Figures 10A to 10C , for ease of explanation, a portion of the wire 50 where the insulating film 52 is removed is marked with a diagonal line.

[0056] The film removal method includes a positioning step S1 and an insulating film removal step S2.

[0057] The positioning step S1 is a step of positioning the wire 50 in the die 3. In the present embodiment, the wire 50 is positioned in the die 3 by the positioning portion 31 of the die 3 at a position where the tip portion 22 of the cutting blade 21 of the punch 2 overlaps the conductor 51 of the wire 50 when viewed in the moving direction Z of the punch 2.

[0058] The insulating film removal step S2 is a step of removing the insulating film 52 on the side surface of the conductor 50. Specifically, in the insulating film removal step S2, the insulating film 52 included in the range R of the insulating film 52 on the side surface of the wire 50 is removed by moving the punch 2 toward the die 3 using the tip portion 22.

[0059] Specifically, the insulating film removal step S2 includes: a first cutting start step S21; a second cutting start step S22; a first insulating film removal step S23; and a second insulating film removal step S24.

[0060] In the present embodiment, as Figure 8 shown, one end portion W1 side of the first cutting start portion 23 and the other end portion W2 side of the second cutting start portion 24 at the tip of the tip portion 22 of the punch 2 protrude most toward the die 3. Therefore, as Figure 10A shown, if the punch 2 is moved forward in the moving direction Z, the tip end 23a of the first cutting start portion 23 and the tip end 24a of the second cutting start portion 24 of the punch 2 first come into contact with the wire 50. Therefore, cuts are formed at the boundaries R1, R2 of the range R where the insulating film 52 is removed in the wire 50.

[0061] That is, the first cutting start portion 23 forms a boundary R1 at one end in the longitudinal direction of the side surface of the wire 50 within the range R. This process is the first cutting start process S21. The second cutting start portion 24 forms a boundary R2 at the other end in the longitudinal direction of the side surface of the wire 50 within the range R. This process is the second cutting start process S22.

[0062] If the punch 2 is further moved forward in the moving direction Z, then as Figure 10B shown, the insulating film 52 within the range R is removed in the moving direction Z by the cutting edge tip 23a of the first cutting start portion 23 and the cutting edge tip 25a of the first cutting edge inclined portion 25, and is removed from the one end portion W1 side toward the other end portion W2 side. The insulating film 52 within the range R is removed in the moving direction Z by the cutting edge tip 24a of the second cutting start portion 24 and the cutting edge tip 26a of the second cutting edge inclined portion 26, and is removed from the other end portion W2 side toward the one end portion W1 side.

[0063] When the punch 2 is further moved forward in the moving direction Z, then as Figure 10C shown, the insulating film 52 within the range R is removed. Thereby, an exposed portion 62 where the conductor 51 in the wire 50 is exposed and a stepped portion 63 located between the covering portion 61 and the exposed portion 62 are formed.

[0064] That is, the first cutting edge inclined portion 25 removes the portion of the insulating film 52 that is located on the side of the boundary R2 at the other end with respect to the boundary R1 at one end of the range R. This process is the first insulating film removal process S23. The second cutting edge inclined portion 26 removes the portion of the insulating film 52 that is located on the side of the boundary R1 at one end with respect to the boundary R2 at the other end of the range R. This process is the second insulating film removal process S24.

[0065] Thus, in the present embodiment, the cutting edge portion 22 cuts incisions at the boundaries R1 and R2 of the range R, and simultaneously removes a plurality of portions of the insulating film 52 within the range R. Thereby, the insulating film 52 can be efficiently removed by the cutting edge portion 22.

[0066] As described above, in the present embodiment, when observing the tool body 21 in the moving direction Z, the tool body 21 has an inclined surface 21b at the connecting portion of the surface 21a on one side in the thickness direction and the end surfaces on both sides in the width direction W. Therefore, as Figures 11 to 13 shown, when observing the wire 50 from which the insulating film 52 within the range R has been removed in the moving direction Z of the punch 2, the stepped portion 63 of the wire 50 is inclined with respect to the extending direction of the wire 50. In the present embodiment, the stepped portion 63 is formed by the first cutting start portion 23 and the second cutting start portion 24 of the cutting edge portion 22.

[0067] That is, in the present embodiment, the boundary portion between the stepped portion 63 and the covering portion 61 is formed by the tip end 23a of the first cutting start portion 23 and the tip end 24a of the second cutting start portion 24 that are inclined with respect to the width direction W when the tool body 21 is viewed in the thickness direction. Therefore, a planar stepped portion 63 can be formed in the moving direction of the tool body 21. Accordingly, a lead wire 50 can be formed in which the boundary portion 61a between the stepped portion 63 and the covering portion 61 extends linearly in a direction perpendicular to the extending direction of the lead wire 50.

[0068] As described above, the exemplary film removal method of the present embodiment is a film removal method for removing the insulating film 52 on the side surface of the conductor 50 using the film removal device 1. The film removal method includes a positioning step S1 and an insulating film removal step S2. In the positioning step S1, the lead wire 50 is positioned at a position where the tip portion 22 of the tool body 21 in the punch 2 overlaps the conductor 51 of the lead wire 50 when viewed in the moving direction Z of the punch 2, by the positioning portion 31 of the die 3. In the insulating film removal step S2, by moving the punch 2 toward the die 3, the insulating film 52 in the range R on the side surface of the lead wire 50 is removed by the tip portion 22.

[0069] The insulating film removal step S2 includes: a first cutting start step S21; a second cutting start step S22; a first insulating film removal step S23; and a second insulating film removal step S24. In the first cutting start step S21, a boundary R1 is formed at one end in the longitudinal direction of the side surface of the lead wire 50 in the range R by the first cutting start portion 23 of the tip portion 22. In the second cutting start step S22, a boundary R2 is formed at the other end in the longitudinal direction of the side surface of the lead wire 50 in the range R by the second cutting start portion 24 of the tip portion 22. In the first insulating film removal step S23, the portion of the insulating film 52 in the range R that is located on the side of the other boundary R2 with respect to the one boundary R1 is removed by the first tip inclination portion 25 of the tip portion 22. In the second insulating film removal step S24, the portion of the insulating film 52 in the range R that is located on the side of the one boundary R1 with respect to the other boundary R2 is removed by the second tip inclination portion 26 of the tip portion 22.

[0070] Thus, for the insulating film 52 within the removed range R that covers the side surface of the lead wire 50, the insulating film 52 can be removed from the boundary R1 at one end in the longitudinal direction of the range R toward the boundary R2 at the other end, and from the boundary R2 at the other end toward the boundary R1 at one end. Therefore, a film removal method can be provided that can efficiently remove the insulating film 52 and can suppress a decrease in the removal accuracy of the insulating film 52.

[0071] (Modification Example of Embodiment 1) The shape of the tip portion 22 of the first embodiment is an example. The tip portion may have other shapes as long as it has a first cutting start portion, a second cutting start portion, a first tip inclination portion, and a second tip inclination portion in which the tip front end is inclined with respect to the width direction of the tool body when the tool body is viewed in the thickness direction.

[0072] For example, as Figure 14 shown, the tool body 121 has a tip portion 122, in which a first cutting start portion 23, a first tip inclination portion 25, a second tip inclination portion 26, and a second cutting start portion 24 are arranged in sequence from one end portion W1 to the other end portion W2 in the width direction W of the tool body 121.

[0073] In addition, as Figure 15 and Figure 16 shown, the tip portions 222, 322 of the tool bodies 221, 321 may not be bilaterally symmetric when viewed in the thickness direction of the tool bodies 221, 321. For example, as Figure 15 shown, in the tip portion 222 of the tool body 221, the first cutting start portion 23 may protrude more forward in the moving direction Z than the second cutting start portion 24. For example, as Figure 16 shown, the tip portion 322 of the tool body 321 may have a plurality of second tip inclination portions 26 having different lengths in the width direction W.

[0074] (Second Embodiment) Refer to Figures 17 to 19 to further illustrate the motor 70 of the exemplary embodiment of the present invention. In the following description, the direction parallel to the central axis P of the stator 71 is referred to as the axial direction, the direction orthogonal to the central axis P is referred to as the radial direction, and the direction along the arc centered on the central axis P is referred to as the circumferential direction. However, the above definitions of directions are not intended to limit the orientation of the motor 70 during use.

[0075] As Figure 17 shown, the motor 70 has a stator 71 and a rotor 72. The rotor 72 rotates about the central axis P of the stator 71. In the present embodiment, the motor 70 is a so-called inner rotor type motor in which the rotor 72 is rotatably located within the cylindrical stator 71 about the central axis P. Since the structure of the rotor 72 is the same as that of a general rotor, the description of the rotor 72 is omitted. In addition, Figure 17 in, the stator coil 74 is shown in a simplified manner.

[0076] As Figure 18 shown, the stator 71 has a stator core portion 73 and a stator coil 74. Figure 18 is a perspective view schematically showing an example of the positional relationship between the stator core portion 73 and the stator coil 74. Figure 18In order to facilitate the description, only a part of the plurality of stator coils 74 located in the slot 73b is shown.

[0077] The stator core 73 is in the shape of a cylinder extending axially with the central axis P as the center. As Figure 18 shown, the stator core 73 has a plurality of teeth 73a arranged circumferentially on the inner peripheral side. The stator core 73 has slots 73b between the circumferentially adjacent teeth 73a. The plurality of slots 73b penetrate the stator core 73 axially. The stator coils 74 are located in the slots 73b. The stator coils 74 are wound around the teeth 73a in a distributed winding manner.

[0078] As Figure 18 and Figure 19 shown, a part of the stator coil 74 wound around the tooth 73a is received in the slot 73b, and a part projects from the axial end surface of the slot 73b. The stator coil 74 is composed of a plurality of wires 50.

[0079] As Figure 19 shown, the wire ends 50a of the plurality of wires 50 project from the axial end surface of the stator core 73. The wire ends 50a of the plurality of wires 50 that project from the axial end surface of the stator core 73 are electrically connected to each other.

[0080] The structure of the wire 50 is the same as that of the first embodiment. That is, the wire 50 has: a covering portion 61 whose side surface is covered with an insulating film 52; and an exposed portion 62 whose side surface is not covered with the insulating film 52 and is exposed. The wire 50 has a stepped portion 63 located between the covering portion 61 and the exposed portion 62. The boundary portion 61a between the stepped portion 63 and the covering portion 61 extends linearly in a direction orthogonal to the extending direction of the wire 50.

[0081] The wire 50 in which the boundary portion 61a between the stepped portion 63 and the covering portion 61 extends linearly in a direction orthogonal to the extending direction of the wire 50 is formed by a tool tip with a cutting start angle greater than 0. That is, the exposed portion 62 and the stepped portion 63 of the wire 50 are formed by the film removing device 1. The wire end 50a of the wire 50 is obtained by cutting the exposed portion 62 of the wire 50 formed by the film removing device 1 at the central portion in the extending direction of the wire 50.

[0082] That is, an exemplary motor 70 of the present embodiment is a motor having a stator 71 and a rotor 72. The stator 71 includes: a stator core 73 having a plurality of slots 73b extending in the axial direction; and a plurality of wires 50 having conductors 51 and insulating films 52 covering the conductors 51, and a part of the plurality of wires 50 is received in the plurality of slots 73b. The rotor 72 rotates about the axis of the stator 71. The wire 50 has: a covered portion 61 where the conductor 51 is covered by the insulating film 52; an exposed portion 62 where the conductor 51 is exposed; and a stepped portion 63 located between the covered portion 61 and the exposed portion 62. The boundary portion between the stepped portion 63 and the covered portion 61 extends linearly in a direction orthogonal to the extending direction of the wire 50.

[0083] In the above-described motor 70, the stepped portion 63 of the wire 50 whose boundary portion 61a with the covered portion 61 is linear is formed by a tool tip with a cutting start angle greater than 0. That is, the insulating film 52 of the wire 50 is removed by the tool body 21 with suppressed reduction in removal accuracy. Therefore, in the stator 21, the reduction in the removal accuracy of the insulating film 52 is suppressed. Therefore, a stator 71 that can efficiently and highly accurately remove the insulating film 52 can be obtained.

[0084] (Other embodiments) The embodiments of the present invention have been described above, but the above embodiments are merely examples for implementing the present invention. Therefore, without being limited to the above embodiments, the above embodiments can be appropriately modified and implemented within the scope not departing from the gist thereof.

[0085] In the first embodiment described above, when the tool body 21 is observed in the moving direction Z, the tool body 21 has inclined surfaces 21b at the connecting portions of one surface 21a in the thickness direction and the end surfaces on both sides in the width direction W. However, it may also be that when observed in the moving direction, the connecting portion of one surface of the tool body in the thickness direction and the end surfaces on both sides in the width direction W does not have an inclined surface.

[0086] In the first embodiment described above, the punch 2 has a pair of tool bodies 21. However, it may also be that the punch has one tool body.

[0087] In the film removing device 1, when observed in the moving direction Z of the punch 2, the die 3 is a rectangle that is longer in a direction crossing the arrangement direction of the pair of tool bodies 21. However, it may also be that when observed in the moving direction, the die is a rectangle that is longer in the arrangement direction of the pair of tool bodies. It may also be that when observed in the moving direction, the die has the same length in the arrangement direction and the direction crossing the arrangement direction. It may also be that when observed in the moving direction, the die is not a rectangle.

[0088] In the first embodiment described above, the positioning portion 31 is a groove portion 31a that positions the wire 50. However, as long as the positioning portion is a structure that can position the wire at a specified position on the base, it can also be other structures. For example, the positioning portion can also be a protruding portion that protrudes from the base of the die and restricts the movement of the wire relative to the die. The positioning portion can also be a fixing member that fixes the wire to a specified position on the base of the die.

[0089] In the first embodiment described above, the inclination angle D23 of the tip end 23a of the first cutting start portion 23 is 20 degrees. The inclination angle D25 of the tip end 25a of the first tip inclination portion 25 is 45 degrees. However, as long as the inclination angle D23 of the tip end of the first cutting start portion is smaller than the inclination angle D25 of the tip end of the first tip inclination portion, it can be smaller than 20 degrees or larger than 20 degrees. As long as the inclination angle D25 of the tip end of the first tip inclination portion is larger than the inclination angle D23 of the tip end of the first cutting start portion, it can be smaller than 45 degrees or larger than 45 degrees. In addition, the inclination angle D23 of the tip end of the first cutting start portion is preferably 20 degrees or more. The inclination angle D25 of the tip end of the first tip inclination portion is preferably 45 degrees to 50 degrees.

[0090] In the first embodiment described above, the inclination angle D24 of the tip end 24a of the second cutting start portion 24 is 20 degrees. The inclination angle D26 of the tip end 26a of the second tip inclination portion 26 is 45 degrees. However, as long as the inclination angle D24 of the tip end of the second cutting start portion is smaller than the inclination angle D26 of the tip end of the second tip inclination portion, it can be smaller than 20 degrees or larger than 20 degrees. As long as the inclination angle D26 of the tip end of the second tip inclination portion is larger than the inclination angle D24 of the tip end of the second cutting start portion, it can be smaller than 45 degrees or larger than 45 degrees. In addition, the inclination angle D24 of the tip end of the second cutting start portion is preferably 20 degrees or more. The inclination angle D26 of the tip end of the second tip inclination portion is preferably 45 degrees to 50 degrees.

[0091] The structure of the motor 70 in the second embodiment described above is an example of the structure of a motor that uses the wire 50 from which the insulating film 52 has been removed by the film removing device 1. As long as the structure of the motor is a structure that can use the wire 50 formed by the film removing device 1 in the first embodiment, it can be any structure.

[0092] (Structural example) In addition, the following structure can also be adopted in the present technology.

[0093] (1) A film removing device is a film removing device that removes the insulating film on the side of a wire through a punch including a blade body and a die. The punch is movable toward the die. The blade body is in a plate shape having a tip portion at the front end in the moving direction of the punch. The tip portion has: a first cutting start portion, a second cutting start portion, at least one first tip inclination portion, and at least one second tip inclination portion, where the front ends of the tips are inclined with respect to the width direction of the blade body when observing the blade body in the thickness direction. The first cutting start portion and the first tip inclination portion are arranged in sequence from one end portion in the width direction of the tip portion to the other end portion. The second cutting start portion and the second tip inclination portion are arranged in sequence from the other end portion in the width direction of the tip portion to one end portion. When observing the blade body in the thickness direction, the inclination angle of the front end of the tip of the first cutting start portion with respect to the width direction is smaller than the inclination angle of the front end of the tip of the first tip inclination portion with respect to the width direction. When observing the blade body in the thickness direction, the inclination angle of the front end of the tip of the second cutting start portion with respect to the width direction is smaller than the inclination angle of the front end of the tip of the second tip inclination portion with respect to the width direction.

[0094] (2) Based on the film removing device described in (1), the length of the first cutting start portion in the width direction is shorter than the length of the first tip inclination portion in the width direction. The length of the second cutting start portion in the width direction is shorter than the length of the second tip inclination portion in the width direction.

[0095] (3) Based on the film removing device described in (2), when observing the blade body in the thickness direction, the front end of the tip of the first cutting start portion is inclined with respect to the width direction. When observing the blade body in the thickness direction, the front end of the tip of the first tip inclination portion is inclined with respect to the width direction at an angle of 45 degrees or more.

[0096] (4) Based on the film removing device described in (2) or (3), when observing the blade body in the thickness direction, the front end of the tip of the second cutting start portion is inclined with respect to the width direction. When observing the blade body in the thickness direction, the front end of the tip of the second tip inclination portion is inclined with respect to the width direction at an angle of 45 degrees or more.

[0097] (5) Based on the film removing device described in any one of (1) to (4), the tip portion has additional first tip inclination portions and additional second tip inclination portions that are alternately arranged in the width direction between the first tip inclination portion adjacent to the first cutting start portion in the width direction and the second tip inclination portion adjacent to the second cutting start portion in the width direction.

[0098] (6) Based on the film removing device described in any one of (1) to (5), the die has a positioning portion for positioning the position of the wire. The positioning portion positions the wire at a position where the tip portion of the punch overlaps with the conductor of the wire when viewed in the moving direction of the punch.

[0099] (7) A film removing method is a film removing method for removing the insulating film on the side surface of a wire by the film removing device described in any one of (1) to (6). The film removing method includes: a positioning process of positioning the wire at a position where the tip portion of the cutter body of the punch overlaps with the conductor of the wire when viewed in the moving direction of the punch by the positioning portion of the die; and an insulating film removing process of removing a specified range of the insulating film on the side surface of the wire by moving the punch toward the die using the tip portion. The insulating film removing process includes: a first cutting start process of forming a boundary at one end in the longitudinal direction of the side surface of the wire in the specified range by the first cutting start portion of the tip portion; a second cutting start process of forming a boundary at the other end in the longitudinal direction of the side surface of the wire in the specified range by the second cutting start portion of the tip portion; a first insulating film removing process of removing a portion of the insulating film in the specified range that is located on the side closer to the other end boundary than the one end boundary by the first tip inclined portion of the tip portion; and a second insulating film removing process of removing a portion of the insulating film in the specified range that is located on the side closer to the one end boundary than the other end boundary by the second tip inclined portion of the tip portion.

[0100] (8) A motor is a motor having a stator and a rotor. The stator has a stator core portion and a plurality of wires. The stator core portion has a plurality of grooves extending in the axial direction. The plurality of wires have a conductor and an insulating film covering the conductor, and a part of the plurality of wires is accommodated in the plurality of grooves. The rotor rotates about the axis of the stator. The wire has: a covering portion where the conductor is covered by the insulating film; an exposed portion where the conductor is exposed; and a stepped portion located between the covering portion and the exposed portion. The boundary portion between the stepped portion and the covering portion extends linearly in a direction orthogonal to the extending direction of the wire. Industrial applicability

[0101] It can be used for the manufacture of stator coils of motors. (Reference signs)

[0102] 1 Film removing device; 2 Punch; 3 Die; 3a Base; 21, 121, 221, 321 Tool body; 21a Surface on one side in the thickness direction of the tool body; 21b Inclined surface; 22, 122, 222, 322 Tool tip; 23 First cutting start portion; 23a Tool tip front end; 24 Second cutting start portion; 24a Tool tip front end; 25 First tool tip inclined portion; 25a Tool tip front end; 26 Second tool tip inclined portion; 26a Tool tip front end; 31 Positioning portion; 31a Groove portion; 32 Insertion hole; 50 Conductive wire; 50a Wire end portion; 51 Conductor; 52 Insulating film; 61 Covering portion; 61a Boundary portion; 62 Exposed portion; 63 Step portion; 70 Motor; 71 Stator; 72 Rotor; 73 Stator core portion; 73a Tooth; 73b Slot; 74 Stator coil; D23 Inclination angle of the tool tip front end of the first cutting start portion with respect to the width direction of the tool body; D24 Inclination angle of the tool tip front end of the second cutting start portion with respect to the width direction of the tool body; D25 Inclination angle of the tool tip front end of the first tool tip inclined portion with respect to the width direction of the tool body; D26 Inclination angle of the tool tip front end of the second tool tip inclined portion with respect to the width direction of the tool body.

Claims

1. A coating removal device for removing the insulating coating from the side of a conductor by means of a punch and a die including a blade, characterized in that: The punch is movable toward the die, The blade body is in the shape of a plate having a blade tip at the end portion on the front side in the moving direction of the punch. The blade tip portion comprises: a first cutting start portion, a second cutting start portion, at least one first blade tip inclined portion and at least one second blade tip inclined portion, wherein the front end of the blade tip is inclined relative to the width direction of the blade body when the blade body is viewed in the thickness direction. The first cutting start portion and the first blade edge inclined portion are arranged in this order from one end portion to the other end portion in the width direction of the blade edge portion. The second cutting start portion and the second blade edge inclined portion are arranged in this order from the other end portion to the one end portion in the width direction of the blade edge portion. When the blade body is observed along the thickness direction, the inclination angle of the tip of the first cutting start portion relative to the width direction is smaller than the inclination angle of the tip of the first blade inclined portion relative to the width direction. When the blade body is viewed in the thickness direction, an inclination angle of the blade tip of the second cutting start portion with respect to the width direction is smaller than an inclination angle of the blade tip of the second blade tip inclined portion with respect to the width direction.

2. The film removal device according to claim 1, characterized in that: The length of the first cutting start portion in the width direction is shorter than the length of the first blade edge inclined portion in the width direction. The length of the second cutting start portion in the width direction is shorter than the length of the second blade edge inclined portion in the width direction.

3. The film removal device according to claim 2, characterized in that: When the blade body is viewed along the thickness direction, the front end of the blade tip of the first cutting start portion is inclined relative to the width direction. When the blade body is viewed in the thickness direction, the blade tip end of the first blade tip inclined portion is inclined at an angle of 45 degrees or more with respect to the width direction.

4. The film removal device according to claim 2, characterized in that: When the blade body is viewed along the thickness direction, the front end of the blade tip of the second cutting start portion is inclined relative to the width direction. When the blade body is viewed in the thickness direction, the blade tip end of the second blade tip inclined portion is inclined at an angle of 45 degrees or more with respect to the width direction.

5. The film removal device according to claim 1, characterized in that: The blade tip portion includes another first blade tip inclined portion and another second blade tip inclined portion alternately arranged in the width direction between the first blade tip inclined portion adjacent to the first cutting start portion in the width direction and the second blade tip inclined portion adjacent to the second cutting start portion in the width direction.

6. The film removal device according to claim 1, characterized in that: The punching die has a positioning portion for positioning the position of the wire. The positioning portion positions the lead wire at a position where the blade tip portion of the punch overlaps with a conductor of the lead wire when viewed along a moving direction of the punch.

7. A coating removal method, comprising removing an insulating coating from a side surface of a conductor by using the coating removal device according to any one of claims 1 to 6, characterized in that: have: a positioning step of positioning the wire by a positioning portion of the die at a position where the tip portion of the blade of the punch overlaps with the conductor of the wire when viewed along the moving direction of the punch; as well as an insulating film removing step of removing a predetermined range of the insulating film on the side surface of the conductive wire by moving the punch toward the die and using the blade tip portion; The insulating film removal step comprises: a first cutting start step of forming a boundary at one end of the side surface of the wire in the predetermined range in the longitudinal direction by the first cutting start portion of the blade tip; a second cutting start step of forming a boundary at the other end of the side surface of the wire in the predetermined range in the longitudinal direction by the second cutting start portion of the blade tip; a first insulating film removing step of removing a portion of the insulating film within the predetermined range located closer to the boundary of the other end than the boundary of the one end by using the first blade tip inclined portion of the blade tip; as well as In the second insulating film removing step, a portion of the insulating film within the predetermined range, which portion is located closer to the boundary at the one end than to the boundary at the other end, is removed by the second blade edge inclined portion of the blade edge portion.

8. A motor, A motor having a stator and a rotor, wherein the stator has a stator core and a plurality of conducting wires, the stator core has a plurality of slots extending in the axial direction, the plurality of conducting wires have conductors and insulating films covering the conductors, and a portion of the plurality of conducting wires is accommodated in the plurality of slots, and the rotor rotates around the axis of the stator, characterized in that: The wire has: a covering portion in which the conductor is covered by the insulating film; An exposed portion where the conductor is exposed; and a step portion between the covering portion and the exposed portion, A boundary portion between the step portion and the covering portion extends linearly in a direction perpendicular to an extending direction of the conductive wire.

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