Method for manufacturing an armature and armature

Abstract

This method for manufacturing an armature comprises an insulation member disposition step for disposing insulation members with respect to a core so as to cause first portions of the insulation members to protrude to one side in the axial direction from one-end surfaces in the axial direction of a plurality of tooth parts. The method for manufacturing an armature further comprises a bending step for bending, toward the respective tooth parts, the first portions, of the insulation members, protruding from the one-end surfaces of the tooth parts. The method for manufacturing an armature still further comprises a wire winding step for winding a winding wire around the respective tooth parts in which the first portions in a state of being bent are disposed.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing an armature and an armature.

Background Art

[0002] Conventionally, a method for manufacturing an armature provided with an insulating member disposed on a core and an armature are known. Such an armature is disclosed in, for example, Japanese Patent Application Laid-Open No. 2018-125898.

[0003] In the rotor (armature) described in Japanese Patent Application Laid-Open No. 2018-125898, a winding, a rotor core, and an insulating member disposed between the winding and the rotor core are provided. The insulating member includes an end face covering portion that covers one end face in the axial direction of the tooth portion, a side face covering portion that covers the side face of the tooth portion, and a tip portion provided so as to project from the other end face in the axial direction of the tooth portion toward the other side in the axial direction. An engaging portion is provided at the tip portion so as to project toward the end portion side of the tooth portion and engage with the other end face of the tooth portion. By engaging the end face of the tooth portion with the engaging portion, the axial movement of the insulating member is restricted.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the rotor (armature) described in Japanese Patent Application Laid-Open No. 2018-125898, an engaging portion that engages with the end face of the tooth portion is provided on the insulating member. Therefore, the shape of the insulating member becomes complicated. Accordingly, a method for manufacturing an armature and an armature capable of simplifying the shape of the insulating member while restricting the axial movement of the insulating member are desired.

[0006] This invention was made to solve the above-mentioned problems, and one objective of this invention is to provide an armature manufacturing method and an armature that can simplify the shape of an insulating member while restricting the axial movement of the insulating member. [Means for solving the problem]

[0007] To achieve the above objective, the method for manufacturing an armature in the first aspect of this invention comprises: an insulating member arrangement step of arranging an insulating member on a core such that the sides of the teeth of a core including a plurality of teeth extending radially are covered by an insulating member, and a first portion of the insulating member protrudes from one end face in the axial direction of the teeth to one side in the axial direction; a bending step of bending the first portion of the insulating member protruding from one end face of the teeth toward the teeth; and a winding step of winding a winding around each of the plurality of teeth on which the bent first portion is arranged. The insulating member placement step is a step of positioning the insulating member relative to the core such that, with the insulating member positioned on the core, the portion of the insulating member adjacent to the first portion in a direction perpendicular to the axial direction protrudes to one side in the axial direction beyond the axial position of one end face of the teeth portion. The bending step is a step of bending the first portion without bending the portion of the insulating member adjacent to the first portion in a direction perpendicular to the axial direction with the insulating member positioned on the core. .

[0008] In the armature manufacturing method according to the first aspect of this invention, as described above, a bending step is performed in which the first portion of the insulating member protruding from one end face of the teeth portion is bent toward the teeth portion. As a result, the first portion bent toward the teeth portion engages with the teeth portion, thereby restricting the axial movement of the insulating member. Furthermore, the axial movement of the insulating member can be restricted simply by bending the first portion, without forming an engagement portion in the first portion in advance to engage with the core. As a result, the structure of the insulating member can be simplified because there is no need to provide an engagement portion on the insulating member. Thus, the shape of the insulating member can be simplified while restricting the axial movement of the insulating member.

[0009] Furthermore, the armature in the second aspect of this invention comprises a winding, a core including a plurality of teeth that are wound around the winding and extend radially, and an insulating member disposed between the core and the winding, wherein the insulating member is provided to cover the side surface of the teeth and one end face of the teeth in the axial direction, and the insulating member covering one end face of the teeth 1 The portion is bent toward the teeth portion, so as to cover one end face, and the portion of the insulating member adjacent to the first portion in a direction perpendicular to the axial direction is provided to protrude to one side in the axial direction from the axial position of one end face of the teeth portion. The insulating member includes a first slit and a second slit, which are provided at one radial end and the other end of the teeth portion of the first part, respectively. .

[0010] In the armature according to the second aspect of this invention, as described above, the portion of the insulating member that covers one end face of the teeth portion is bent toward the teeth portion so as to cover one end face. As a result, the portion of the insulating member that is bent toward the teeth portion engages with the teeth portion, thereby restricting the axial movement of the insulating member. Furthermore, the axial movement of the insulating member can be restricted simply by bending the above portion, without forming an engagement portion that engages with the core in advance. As a result, the structure of the insulating member can be simplified because there is no need to provide an engagement portion on the insulating member. Thus, it is possible to provide an armature that can simplify the shape of the insulating member while restricting the axial movement of the insulating member. [Effects of the Invention]

[0011] According to the present invention, the shape of the insulating member can be simplified while restricting the axial movement of the insulating member. [Brief explanation of the drawing]

[0012] [Figure 1] This is a plan view showing the configuration of a stator according to one embodiment. [Figure 2] This is an enlarged perspective view of the vicinity of one of the teeth in Figure 1. [Figure 3] This is a cross-sectional view along the 200-200 line in Figure 1. [Figure 4] This is a perspective view of an insulating member according to one embodiment. [Figure 5] This is a flowchart showing a method for manufacturing a stator according to one embodiment. [Figure 6]It is a perspective view showing the step of arranging an insulating member according to an embodiment on a stator core. [Figure 7] It is a cross-sectional view showing the state of the insulating member before the bending step according to an embodiment. [Figure 8] It is a cross-sectional view showing the bending step according to an embodiment.

Mode for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0014] Referring to FIGS. 1 to 8, the stator 100 and the manufacturing method of the stator 100 according to the present embodiment will be described. The stator 100 is a stator of a rotating electrical machine configured as a motor or a generator. Note that the stator 100 is an example of the "armature" in the claims.

[0015] In the present specification, the "axial direction" is the Z direction (Z1 direction, Z2 direction), the "circumferential direction" is the E direction (E1 direction, E2 direction), and the "radial direction" is the R direction (R1 direction, R2 direction).

[0016] (Configuration of Stator) As shown in FIG. 1, the stator 100 includes a stator core 10, a winding 20 (see FIG. 3), and an insulating member 30. The insulating member 30 is disposed between the stator core 10 and the winding 20. That is, the insulating member 30 insulates the stator core 10 and the winding 20. Note that, except in FIG. 3, the illustration of the winding 20 is omitted for simplification. Further, the stator core 10 is an example of the "core" in the claims.

[0017] The stator core 10 includes a plurality (12 in this embodiment) of teeth portions 11 extending along the radial direction (R direction). The stator core 10 also includes a plurality of slots 12 provided between adjacent teeth portions 11 in the circumferential direction (E direction). The slot 12 is a semi-open type slot with an open inner side in the radial direction. The stator core 10 further includes an annular back yoke portion 13 connecting the plurality of teeth portions 11 to each other. Each of the plurality of teeth portions 11 is provided so as to protrude radially inward (R1 side) from the back yoke portion 13. That is, the stator 100 is a stator of an inner rotor type brushless motor. Also, a winding 20 is wound around each of the plurality of teeth portions 11 a plurality of times (see FIG. 3). Note that the back yoke portion 13 is an example of the "yoke portion" in the claims.

[0018] As shown in FIG. 2, the insulating member 30 is provided so as to cover the side surface 11a (see FIG. 3) of the tooth portion 11 and the end surface 11b on one axial side (Z1 side) of the tooth portion 11. Specifically, the insulating member 30 includes a side surface covering portion 31 that covers the side surfaces 11a on both sides in the circumferential direction (E direction) of each of the plurality of tooth portions 11. The insulating member 30 also includes an end surface covering portion 32 that covers the end surface 11b on the Z1 side of each of the plurality of tooth portions 11. The side surface covering portion 31 and the end surface covering portion 32 are connected to each other. Note that the end surface covering portion 32 is an example of the "first part" and "part" in the claims.

[0019] Also, the insulating member 30 is formed of a resin such as 66 nylon or PPS (polyphenylene sulfide), for example.

[0020] As shown in FIG. 3, each of the pair of side surfaces 11a of the tooth portion 11 is covered by the side surface covering portion 31. That is, the side surfaces 11a of the plurality of tooth portions 11 are covered by the pair of side surface covering portions 31. Also, the end surface covering portion 32 is provided so as to extend along the end surface 11b on the Z1 side from each of the pair of side surface covering portions 31. That is, the end surface 11b of each of the plurality of tooth portions 11 is covered by the pair of end surface covering portions 32.

[0021] Here, the end face covering portion 32 is bent toward the teeth portion 11, so as to cover the end face 11b.

[0022] As a result, the end face covering portion 32 of the insulating member 30, which is bent toward the teeth portion 11, engages with the teeth portion 11, thereby restricting the axial movement of the insulating member 30. Furthermore, the axial movement of the insulating member 30 can be restricted simply by bending the end face covering portion 32, without having to pre-form an engaging portion on the end face covering portion 32 to engage with the stator core 10. As a result, the structure of the insulating member 30 can be simplified because there is no need to provide an engaging portion on the insulating member 30. Thus, it is possible to provide a stator 100 that can simplify the shape of the insulating member 30 while restricting its axial movement.

[0023] Specifically, each of the pair of end face covering portions 32 provided on each of the multiple tooth portions 11 is bent toward the corresponding tooth portion 11.

[0024] Furthermore, a gap 33 is provided between the pair of end face covering portions 32. That is, the circumferential width W1 of the end face covering portion 32 is less than half the circumferential width W2 of the teeth portion 11. The width W1 of the end face covering portion 32 is, for example, about 0.5 mm to 4 mm. The width W1 of the end face covering portion 32 is large enough to restrict the axial movement of the teeth portion 11.

[0025] Furthermore, the insulating member 30 includes an end face covering portion 34 that covers the other end face 11c (Z2 side) in the axial direction of each of the multiple tooth portions 11. The end face covering portion 34 is connected to each of a pair of side covering portions 31 that cover the side surface 11a of the tooth portion 11.

[0026] Furthermore, the insulating member 30 includes a yoke-side covering portion 35 arranged along the back yoke portion 13. The yoke-side covering portion 35 is provided to cover the radially outer side surfaces 12a (see Figure 1) of the plurality of slots 12. Each of the plurality of yoke-side covering portions 35 is provided with a projection 35a that protrudes from one end face 13a (see Figure 2) on one axial side (Z1 side) of the back yoke portion 13 in the axial direction. The projection 35a is provided adjacent to the end face covering portion 32. The end face 13a of the back yoke portion 13 and the end face 11b of the teeth portion 11 are flush with each other. The projection 35a is an example of the "second part" of the claim.

[0027] As shown in Figure 2, a slit 36 ​​is provided between the end face covering portion 32 and the protruding portion 35a. The end face covering portion 32 and the protruding portion 35a are separated from each other by the slit 36. The slit 36 ​​is provided on both sides of the protruding portion 35a in the circumferential direction (E direction). The side covering portion 31 and the yoke side covering portion 35 are connected to each other.

[0028] Furthermore, the insulating member 30 includes opening-side portions 37 provided on both sides in the circumferential direction (E direction) of each radially inner opening 12b (see Figure 1) of the plurality of slots 12. The opening-side portions 37 restrict the radially inner (R1 side) movement of the winding 20 (see Figure 3) wound around the teeth portion 11. The minimum value of the circumferential (E direction) thickness t1 of the opening-side portions 37 is greater than the circumferential thickness t2 (see Figure 3) of the side covering portion 31. The thickness t2 of the side covering portion 31 is, for example, about 0.1 mm to 1 mm.

[0029] Each of the multiple opening-side portions 37 is provided with a projection 37a that protrudes from the end face 11b of the teeth portion 11 toward one side in the axial direction (Z1 side). The projection 37a is provided so as to be adjacent to the end face covering portion 32 in the radial direction (R1 direction). The projection length L1 of the projection 35a of the yoke-side covering portion 35 from the end face 13a of the back yoke portion 13 is approximately equal to the projection length L2 of the projection 37a from the end face 11b of the teeth portion 11. The projection lengths L1 and L2 are smaller than the width W1 of the end face covering portion 32 (see Figure 3).

[0030] Furthermore, a slit 38 is provided between the protruding portion 37a of the opening-side portion 37, which is provided adjacent to the opening-side portion 37 in the radial direction, and the end-face covering portion 32. The end-face covering portion 32 and the protruding portion 37a are separated from each other by the slit 38. The side covering portion 31 and the opening-side portion 37 are connected to each other.

[0031] Furthermore, as shown in Figure 4, the insulating member 30 is connected to each of the multiple teeth 11 by its respective parts. In other words, the insulating member 30 is a single member formed in an annular shape.

[0032] (Method of manufacturing a stator) Next, the manufacturing method of the stator 100 will be described with reference to Figures 5 to 8.

[0033] (Insulating material placement process) As shown in Figure 5, first, in step S1, an insulating member placement step is performed in which the insulating member 30 is placed on the stator core 10. The insulating member placement step (S1) is a step in which the insulating member 30 is placed on the stator core 10 from the other axial side (Z2 side). Specifically, as shown in Figure 6, with the end face covering portion 32 of the insulating member 30 facing the Z1 side, the insulating member 30 is moved toward the stator core 10 side (Z1 side). Alternatively, the stator core 10 may be moved toward the insulating member 30 side (Z2 side).

[0034] Furthermore, the insulating member placement step (S1) is a step in which the insulating member 30 is placed on the stator core 10 such that the side surface 11a of the tooth portion 11 is covered by the insulating member 30 (side covering portion 31), and the end covering portion 32 of the insulating member 30 protrudes from the Z1 side end surface 11b of the tooth portion 11 on one side in the axial direction (Z1 side).

[0035] Furthermore, the insulating member placement step (S1) is a step in which the insulating member 30 is placed on the stator core 10 such that the protruding portion 35a protrudes from the end face 13a of the back yoke portion 13 to one side in the axial direction (Z1 side) (see Figure 2).

[0036] Here, the insulating member placement step (S1) is the step of placing the insulating member 30 on the stator core 10 such that the protrusion length L3 (see Figure 7) of the end face covering portion 32 from the end face 11b of the teeth portion 11 is greater than the protrusion length L1 of the protrusion portion 35a from the end face 13a of the back yoke portion 13.

[0037] This allows the area covered by the end face covering portion 32 to be increased, and prevents the axial length of the insulating member 30 from becoming excessively large compared to the case where the protruding length L1 of the protruding portion 35a is greater than or equal to the protruding length L3 of the end face covering portion 32.

[0038] The end face covering portion 32 is provided to extend along the axial direction (Z direction) when the insulating member 30 is placed on the stator core 10. That is, the protruding length L3 of the end face covering portion 32 is approximately equal to the width W1 of the end face covering portion 32 (see Figure 3).

[0039] Next, as shown in Figure 5, step S2 involves a bending process in which the end face covering portion 32 is bent toward the teeth portion 11.

[0040] As a result, the end face covering portion 32, which is bent towards the teeth portion 11, engages with the teeth portion 11, thereby restricting the axial movement of the insulating member 30. Furthermore, the axial movement of the insulating member 30 can be restricted simply by bending the end face covering portion 32, without having to pre-form an engaging portion on the end face covering portion 32 to engage with the stator core 10. As a result, the structure of the insulating member 30 can be simplified because there is no need to provide an engaging portion on the insulating member 30. Thus, the shape of the insulating member 30 can be simplified while restricting its axial movement.

[0041] Furthermore, since the shape of the insulating member 30 is simplified, the shape of the mold for forming the insulating member 30 can be simplified. Also, because the insulating member 30 does not have an engaging portion that engages with the end face 11b of the stator core 10, interference between the stator core 10 and the insulating member 30 can be reduced when the insulating member 30 is placed (assembled) onto the stator core 10 from the other axial side. As a result, the insulating member 30 can be easily placed on the stator core 10.

[0042] Furthermore, since the end face covering portion 32 is bent toward the teeth portion 11 and the winding 20 is wound around the teeth portion 11, it is possible to prevent the end face covering portion 32 from getting caught on the winding 20 compared to the case where the end face covering portion 32 is provided so as to extend along the axial direction.

[0043] Furthermore, the insulating member placement step (S1), as shown in Figure 8, is a step in which the end face covering portion 32 is pressed by the punch member 300 from one side in the axial direction (Z1 side) and bent toward the teeth portion 11. The punch member 300 is provided with a flat pressing surface 301 that presses toward the end face covering portion 32. The pair of end face covering portions 32 provided on both sides in the circumferential direction of the teeth portion 11 are bent simultaneously by the pressing surface 301.

[0044] Furthermore, the punch member 300 is provided with restricting portions 302 on both sides of the pressing surface 301 in the circumferential direction (E direction) and extending along the axial direction. The restricting portions 302 move along the side covering portion 31 toward Z2 when the punch member 300 (pressing surface 301) moves toward Z2 while bending the end covering portion 32. As a result, the movement of the punch member 300 in the circumferential direction is restricted by the restricting portions 302. The punch member 300 is an annular member. That is, the end covering portion 32 of each of the multiple teeth portions 11 is bent simultaneously by the annular punch member 300 (pressing surface 301). Alternatively, the punch member may be used to bend the end covering portion 32 of each tooth portion 11 individually.

[0045] Furthermore, the bending process (S2) is a process in which the end face covering portion 32 is plastically deformed by bending it while heating it.

[0046] As a result, the end face covering portion 32 is heated, which softens it, allowing it to be easily bent with relatively little force. Furthermore, the plastic deformation of the end face covering portion 32 prevents it from returning to its original shape after being bent, thus more reliably preventing axial movement of the stator core 10.

[0047] Specifically, the bending process (S2) is a process in which the end face covering portion 32 is heated and bent by pressing it with a heated punch member 300.

[0048] Furthermore, the bending process (S2) is a process of bending the end face covering portion 32 while heating it so that the temperature of the end face covering portion 32 is above the glass transition point of the insulating member 30 and below the melting point of the insulating member 30. In other words, the end face covering portion 32, which is made of resin, is transformed from a hard glass state to a soft rubber state when heated above the glass transition point.

[0049] As a result, the end-face coating portion 32 becomes flexible, allowing it to be easily bent with relatively little force. Furthermore, since the temperature of the end-face coating portion 32 is below the melting point of the insulating material 30, it is possible to prevent the end-face coating portion 32 from melting.

[0050] Furthermore, the bending process (S2) is a process in which the end face covering portion 32 is bent to bring it into surface contact with the teeth portion 11 and to make it tightly adhered.

[0051] As a result, no gap is formed between the end face covering portion 32 and the end face 11b of the teeth portion 11, thus more reliably restricting the axial movement of the insulating member 30.

[0052] Specifically, the bending process (S2) is a process in which the end face covering portion 32 is pressed against the end face 11b by the pressing surface 301 of the punch member 300, which has a flat surface similar to the end face 11b of the teeth portion 11.

[0053] Furthermore, the bending process (S2) is a process of bending each of the pair of end face covering portions 32 toward the teeth portion 11 such that a gap 33 (see Figure 3) is formed between the pair of end face covering portions 32 when each of the pair of end face covering portions 32 is bent toward the teeth portion 11. Specifically, the bending process (S2) is a process of bending each of the pair of end face covering portions 32 that protrude from the end face 11b by a protrusion length L3 which is less than half of the circumferential width W2 of the teeth portion 11 toward the teeth portion 11.

[0054] This prevents the folded pair of end face coverings 32 from overlapping each other. As a result, it is possible to more reliably prevent the formation of a gap between the end face covering 32 and the end face 11b of the teeth portion 11.

[0055] Furthermore, the bending process (S2) involves bending the end face covering portion 32 without bending the protruding portion 35a of the yoke side covering portion 35.

[0056] As a result, when winding the winding 20 around the end face covering portion 32, the protruding portion 35a is not bent but extends along the axial direction, allowing the winding 20 to be supported by the protruding portion 35a while being wound around the teeth portion 11. Consequently, the work of winding the winding 20 around the teeth portion 11 can be made easier. Furthermore, the pressure applied by the punching member 300 can be reduced compared to the case where both the end face covering portion 32 and the protruding portion 35a are bent. Consequently, the equipment that drives the punching member 300 can be made smaller.

[0057] Furthermore, the bending process (S2) is a process in which the end face covering portion 32 is bent without bending the protruding portion 37a of the opening side portion 37. In other words, the bending process (S2) is a process in which pressure is applied by the punch member 300 while the punch member 300 is in contact with the end face covering portion 32 without contacting the protruding portions 35a and 37a.

[0058] Furthermore, the bending process (S2) involves bending the end face covering portion 32 and the protruding portion 35a of the yoke-side covering portion 35, which are separated from each other via the slit 36, without bending the protruding portion 35a.

[0059] As a result, the end-face covering portion 32 and the protruding portion 35a are separated from each other by the slit 36, which prevents the protruding portion 35a from bending along with the end-face covering portion 32 when the end-face covering portion 32 is bent.

[0060] Furthermore, the bending process (S2) involves bending the end face covering portion 32 without bending the protruding portion 37a of the opening side portion 37, which are separated from each other by the slit 38. This prevents the protruding portion 37a from being bent along with the end face covering portion 32 when the end face covering portion 32 is bent, because the end face covering portion 32 and the protruding portion 37a are separated from each other by the slit 38.

[0061] Then, as shown in Figure 5, in step S3, a winding process is performed in which the winding wire 20 (see Figure 3) is wound around each of the multiple tooth portions 11 on which the bent end face covering portion 32 is positioned. Specifically, the winding process (S3) is a process in which the winding wire 20 is wound around the tooth portion 11 while the end face covering portion 32 is in close contact with the end face 11b of the tooth portion 11. Note that the winding process (S3) is a process in which the winding wire 20 is wound around the tooth portion 11 from above the end face covering portion 32 after the temperature of the end face covering portion 32, which was heated in the bending process (S2), has been cooled to room temperature.

[0062] [Differentiation] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the description of the embodiments above, and further includes all modifications (exceptions) within the meaning and scope of the claims.

[0063] For example, the above embodiment shows an example in which the end face covering portion 32 (first portion, portion) is bent while being heated, but the present invention is not limited thereto. The end face covering portion 32 may be bent without heating. In this case, ABS, PE (polyethylene), and PP (polypropylene) can be used as the insulating member 30.

[0064] Furthermore, in the above embodiment, an example was shown in which the end face covering portion 32 (first portion, portion) is bent while being heated by a heated punch member 300, but the present invention is not limited thereto. For example, the end face covering portion 32 may be bent by the punch member 300 while being directly heated by a laser or infrared light. In this case, the punch member 300 may or may not be heated.

[0065] Furthermore, in the above embodiment, an example was shown in which a pair of end face covering portions 32 are bent so that a gap 33 is formed between them, but the present invention is not limited thereto. For example, a pair of end face covering portions 32 may be bent so that no gap is formed between them (so that the pair of end face covering portions 32 overlap each other).

[0066] Furthermore, although the above embodiment shows an example in which the end face covering portion 32 (first portion, part) is folded without folding the protruding portion 35a (second portion) of the yoke-side covering portion 35, the present invention is not limited to this. For example, the protruding portion 35a may be folded together with the end face covering portion 32. In this case, the slit 36 ​​may not be provided. Also, although the above embodiment shows an example in which the end face covering portion 32 is folded without folding the protruding portion 37a of the opening-side portion 37, the protruding portion 37a may be folded together with the end face covering portion 32. In this case, the slit 38 may not be provided.

[0067] Furthermore, although the above embodiment shows an example where the protrusion length L3 from the end face 11b of the end face covering portion 32 (first portion) is greater than the protrusion length L1 from the end face 13a of the protrusion portion 35a (second portion), the present invention is not limited to this. The protrusion length L3 may be less than or equal to the protrusion length L1.

[0068] Furthermore, although the above embodiment shows an example of an inner rotor type brushless motor in which the teeth portion 11 protrudes radially inward from the back yoke portion 13 (yoke portion), the present invention is not limited to this. For example, the present invention may be applied to the stator of an outer rotor type brushless motor or the rotor of a brushed motor in which the teeth portion 11 protrudes radially outward from the yoke portion.

[0069] Furthermore, although the above embodiment shows an example in which the end face covering portion 32 (first portion, portion) is bent by the flat pressing surface 301 of the punch member 300, the present invention is not limited thereto. The pressing surface of the punch member that bends the end face covering portion 32 may be inclined with respect to the end face 11b of the teeth portion 11. Also, the pressing surface of the punch member may be curved (for example, curved convexly toward the Z1 side).

[0070] Furthermore, although the above embodiment shows an example where the insulating member 30 is a single annular member, the present invention is not limited thereto. Separate insulating members may be provided for each tooth portion 11. For example, the insulating member 30 does not have to include end face covering portions 34 connected to each of the pair of side covering portions 31. In that case, the insulating member 30 may be arranged not only from the other axial side (Z2 side) relative to the stator core 10 as in the above embodiment, but also from one axial side (Z1 side) relative to the stator core 10, or from the radially inward side relative to the stator core 10. [Explanation of Symbols]

[0071] 10... Stator core (core), 11... Teeth section, 11a... Side view, 11b... End face (end face of the teeth section), 13... Back yoke section (yoke section), 13a... End face (end face of the yoke section), 20... Winding, 30... Insulating member, 32... End face covering section (first part), 33... Gap, 35a... Protrusion (second part), 36... Slit, 100... Stator (armature), L1... Protrusion length (protrusion length of the second part), L3... Protrusion length (protrusion length of the first part)

Claims

1. An insulating member placement step is to arrange the insulating member on the core such that the sides of the teeth of the core, which includes a plurality of teeth extending radially, are covered by the insulating member, and a first portion of the insulating member protrudes from one end face in the axial direction of the teeth on one side in the axial direction, A bending step of bending the first portion of the insulating member that protrudes from one end face of the teeth portion toward the teeth portion, The process includes winding a winding wire around each of the plurality of teeth portions on which the first portion in a folded state is arranged, The insulating member placement step is a step of arranging the insulating member relative to the core such that, when the insulating member is placed on the core, the portion of the insulating member adjacent to the first portion in a direction perpendicular to the axial direction protrudes to one side in the axial direction beyond the axial position of one end face of the teeth portion. A method for manufacturing an armature, wherein the bending step is a step of bending the first portion without bending the portion of the insulating member adjacent to the first portion in a direction along a plane perpendicular to the axial direction while the insulating member is arranged on the core.

2. The method for manufacturing an armature according to claim 1, wherein the bending step is a step of arranging the insulating member from the other side in the axial direction with respect to the core.

3. The method for manufacturing an armature according to claim 1, wherein the bending step is a step of plastically deforming the first portion by bending it while heating it.

4. The method for manufacturing an armature according to claim 3, wherein the bending step is a step of bending the first portion while heating it so that the temperature of the first portion is above the glass transition point of the insulating member and below the melting point of the insulating member.

5. The method for manufacturing an armature according to claim 1, wherein the bending step is a step of bending the first portion to bring the first portion into surface contact with and tightly adhere to the teeth portion.

6. The method for manufacturing an armature according to claim 1, wherein the bending step is a step of bending each of the pair of first portions, which are provided on both sides of the circumferential direction of the teeth portion, toward the teeth portion, such that a gap is formed between the pair of first portions when each of the pair of first portions is bent toward the teeth portion.

7. The insulating member placement step is a step of placing the insulating member on the core such that, with the insulating member placed on the core, the second portion of the insulating member, which is arranged along the annular yoke portion of the core connecting the plurality of teeth portions and is provided adjacent to the first portion, protrudes from one end face in the axial direction of the yoke portion to the one side in the axial direction, The method for manufacturing an armature according to claim 1, wherein the bending step is a step of bending the first portion without bending the second portion.

8. The method for manufacturing an armature according to claim 7, wherein the bending step is a step of bending the first portion without bending the second portion, of the first portion and the second portion which are separated from each other by a slit provided between the first portion and the second portion.

9. The method for manufacturing an armature according to claim 7, wherein the insulating member arrangement step is a step of arranging the insulating member in the core such that the protrusion length of the first portion of the teeth portion from one end face is greater than the protrusion length of the second portion from one end face of the yoke portion.

10. Winding and, A core including a plurality of teeth portions that are wound around the aforementioned winding and extend radially, The system comprises an insulating member disposed between the core and the winding, The insulating member is provided so as to cover the side surface of the teeth portion and one end face of the teeth portion in the axial direction. The first portion of the insulating member that covers one end face of the teeth portion is bent toward the teeth portion so as to cover the one end face. The portion of the insulating member adjacent to the first portion in a direction perpendicular to the axial direction is provided so as to protrude to one side in the axial direction from the axial position of one end face of the teeth portion. The insulating member is an armature that includes a first slit and a second slit, which are provided at one radial end and the other radial end of the teeth portion of the first part, respectively.

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