JP2023022646A - Device and method for manufacturing armature - Google Patents

Abstract

To provide a device and a method for manufacturing an armature that suppress stress concentration on an insulator.SOLUTION: A manufacturing device 60 includes a pressing jig 70 for forming a coil 30 by pressing a segment coil 40 arranged so as to extend in an axial direction of a stator core 20 inside a slot 23 toward an inner surface of the slot 23 in a radial direction and plastically deforming it. The pressing jig 70 has a pressing surface 71 that presses an arranging unit 31 arranged inside the slot 23 in the segment coil 40 over an entire axial direction. The pressing surface 71 has a closest portion 72 that is closest to the inner surface of the slot 23 in the radial direction, and a first inclined portion 75 and a second inclined portion 76 that are continuous with the closest portion 72 and are inclined away from the inner surface in the radial direction away from the closest portion 72 in the axial direction.SELECTED DRAWING: Figure 4

Description

The present invention relates to an armature manufacturing apparatus and an armature manufacturing method.

Conventionally, an armature such as a stator of a rotating electrical machine includes a cylindrical iron core having a plurality of slots, coils arranged inside the slots, and an insulating sheet arranged between the inner surface of the slots and the coils. ing.

Specifically, the iron core has a cylindrical yoke and a plurality of teeth projecting radially inward from the yoke. Slots are formed between adjacent teeth.
For example, in Patent Document 1, a conducting wire arranged to extend in the axial direction inside a slot is pressed toward the inner surface of the slot in the radial direction using a pressing jig to plastically deform, thereby forming the coil. It is disclosed to

JP 2021-87284 A

By the way, conventional pressing jigs including the pressing jig disclosed in Patent Document 1 have a flat pressing surface perpendicular to the radial direction of the iron core. When such a pressing jig is used, there is a problem that stress tends to concentrate on the insulating sheet at the end position of the iron core in the axial direction.

An armature manufacturing apparatus that solves the above problems includes a cylindrical iron core having a plurality of slots, coils arranged inside the slots, and an insulator arranged between the inner surface of the slots and the coils. and wherein a plurality of the coils are arranged side by side in the radial direction of the iron core, wherein a conductor wire arranged to extend in the axial direction of the iron core inside the slot is A pressing jig is provided for forming the coil by pressing toward the inner surface of the slot in the radial direction to plastically deform the coil, and the pressing jig is an arrangement portion of the conductor wire disposed inside the slot. The pressing surface includes a closest portion that is closest to the inner surface of the slot in the radial direction and a closest portion that continues to the closest portion and is closest to the inner surface of the slot in the axial direction. a sloped portion that slopes away from the inner surface in the radial direction as the distance from the contact portion increases.

Further, a method of manufacturing an armature for solving the above-described problems includes a cylindrical iron core having a plurality of slots, coils arranged inside the slots, and coils arranged between the inner surface of the slots and the coils. and an insulator, wherein a plurality of the coils are arranged side by side in the radial direction of the iron core, wherein conducting wires are arranged inside the slots so as to extend in the axial direction of the iron core. and a pressing step of plastically deforming the conductive wire to form the coil by pressing the conductive wire toward the inner surface of the slot with the pressing jig.

According to the above configuration and method, when the pressing surface of the pressing jig presses the conductive wire arrangement portion, the load is greatest at the closest portion. Further, since the pressing surface of the pressing jig has an inclined portion, the load is smaller at the end portion of the pressing surface away from the closest portion in the axial direction than at the closest portion. In addition, since the pressing surface has the inclined portion, the load is suppressed from abruptly changing in the axial direction. For these reasons, it is possible to suppress concentration of stress on the insulator at the end position of the core in the axial direction. Therefore, stress concentration on the insulator can be suppressed.

FIG. 1 is a cross-sectional view showing a stator in one embodiment. FIG. 2 is an enlarged cross-sectional view showing an enlarged part of FIG. FIG. 3 is an exploded perspective view showing a stator core and segment coils separated from each other in the same embodiment. FIG. 4 is a cross-sectional perspective view showing the segment coils and the pressing jig arranged inside the slots of the stator core in the same embodiment, separated from each other. FIG. 5 is a cross-sectional view showing the segment coils and the pressing jig arranged inside the slots of the stator core in the same embodiment, separated from each other. FIG. 6 is a cross-sectional view showing a state in which five segment coils are arranged inside the slots of the stator core in the same embodiment. FIG. 7 is a view corresponding to FIG. 6, and is a cross-sectional view showing five segment coils and a pressing jig of the same embodiment separated from each other. FIG. 8 is a view corresponding to FIG. 6 and a cross-sectional view showing a state in which five segment coils of the same embodiment are pressed by a pressing jig. 9 is a view corresponding to FIG. 6, and is a cross-sectional view showing a state in which eight segment coils of the same embodiment are pressed by a pressing jig. 10 is a cross-sectional view taken along line 10A-10A of FIG. 9. FIG. 11 is a view corresponding to FIG. 10, and is a cross-sectional view showing a state in which the segment coil is pressed by a conventional pressing jig. FIG. 12 is a cross-sectional view showing a state in which the segment coil is pressed by the first modified example. FIG. 13 is a cross-sectional view showing a state in which the segment coil is pressed by the second modified example. FIG. 14 is a cross-sectional view showing a state in which the segment coil is pressed by the third modified example. FIG. 15 is a cross-sectional view showing a state in which the segment coil is pressed by the fourth modified example.

An embodiment in which an armature manufacturing apparatus and an armature manufacturing method are embodied as a stator manufacturing apparatus and a stator manufacturing method will be described below with reference to FIGS.
In each drawing, part of the configuration may be exaggerated or simplified for convenience of explanation. Also, the dimensional ratio of each part may differ from the actual one.

(Stator 10)
As shown in FIGS. 1 and 2, the stator 10 includes a stator core 20, coils 30, and a plurality of insulating sheets 50. As shown in FIGS. The stator core 20 has a cylindrical shape. Coil 30 is wound around stator core 20 . Each insulating sheet 50 covers the outer surface of the coil 30 . The stator core 20 corresponds to an "iron core".

The stator 10 of this embodiment is used in a three-phase synchronous rotating electric machine, and is provided so as to surround a rotor (not shown).
Hereinafter, the axial direction, the radial direction, and the circumferential direction of the stator core 20 are simply referred to as the axial direction, the radial direction, and the circumferential direction, respectively.

(Stator core 20)
The stator core 20 has a yoke 21 , multiple teeth 22 and multiple slots 23 . The yoke 21 has a cylindrical shape. The plurality of teeth 22 protrude radially inward from the yoke 21 and are spaced apart from each other in the circumferential direction. One slot 23 is formed between teeth 22 adjacent in the circumferential direction. Each slot 23 is open radially inward and axially on both sides. The stator core 20 of this embodiment has a total of 48 slots 23 .

As shown in FIG. 1 , the stator core 20 has three fixed portions 24 protruding radially outward from the yoke 21 . The three fixing portions 24 are provided at intervals in the circumferential direction. Each fixed portion 24 is provided with a bolt hole 24a that penetrates the fixed portion 24 in the axial direction. A bolt (not shown) inserted into the bolt hole 24a is fastened to a housing (not shown), thereby fixing the stator core 20 to the housing.

The stator core 20 is configured, for example, by joining together a plurality of magnetic steel sheets that are laminated in the axial direction.
(Coil 30)
The coil 30 is composed of three phase windings that constitute a U-phase, a V-phase and a W-phase. Each phase winding is wound across a plurality of teeth 22 .

The coil 30 has a conductor and an insulating coating covering the outer periphery of the conductor. The conductor is made of, for example, a metal material such as an aluminum alloy. In each figure, illustration of the insulating coating is omitted.

As shown in FIGS. 3 and 4 , the coil 30 has a plurality of arrangement portions 31 , a plurality of first coil ends 32 and a plurality of second coil ends 33 .
The placement portion 31 is placed inside the slot 23 . The placement portion 31 extends linearly in the axial direction. Inside the slot 23, eight arrangement portions 31 are arranged in a radial direction.

As shown in FIGS. 2 and 4, the cross-sectional shape of the coil 30 perpendicular to the length direction is a rectangle having long sides and short sides. Long sides of the cross-sectional shape of the placement portion 31 extend in the width direction of the slot 23 , and short sides of the cross-sectional shape of the placement portion 31 extend in the radial direction. The long side of the arrangement portion 31 is the same as the opening width of the insulating sheet 50 . The width direction of the slot 23 is a direction orthogonal to both the axial direction and the radial direction.

The first coil end 32 extends in one axial direction from the arrangement portion 31 . The first coil end 32 protrudes from the slot 23 in one axial direction. Although not shown, the first coil end 32 is bent in the circumferential direction to connect the two arrangement portions 31 arranged inside the two different slots 23 .

The second coil end 33 extends from the arrangement portion 31 to the opposite side in the axial direction. The second coil end 33 protrudes from the slot 23 on the other side opposite to the one side in the axial direction and is bent in the circumferential direction. The second coil end 33 connects two arrangement portions 31 arranged inside two different slots 23 .

(Segment coil 40)
As shown in FIGS. 2 and 4, each phase winding of the coil 30 described above is configured by joining a plurality of segment coils 40 to each other. In this embodiment, eight segment coils 40 are arranged radially inside one slot 23 .

As shown in FIG. 3 , the segment coil 40 has two linear portions 34 extending in parallel and a connecting portion 35 connecting the ends of the two linear portions 34 . The segment coil 40 is U-shaped.

The two straight portions 34 of the segment coil 40 are inserted into the two different slots 23 from one side in the axial direction. After that, a portion of the straight portion 34 protruding from the slot 23 is bent in one or the other circumferential direction. Then, the straight portion 34 of one segment coil 40 and the straight portion 34 of a segment coil 40 other than the segment coil 40 are joined. Each phase winding is thus configured.

Each straight portion 34 is composed of the first coil end 32 , the placement portion 31 , and the second coil end 33 . Therefore, the segment coil 40 has two arrangement portions 31 respectively arranged inside two slots 23 different from each other, two first coil ends 32 independent of each other, and two second coil ends 33. ing. The two first coil ends 32 in the segment coil 40 extend cantilevered from the two arrangement portions 31 respectively. The two second coil ends 33 are connected by a connecting portion 35 at portions of the two arrangement portions 31 opposite to the first coil end 32 . The segment coil 40 corresponds to a "conductor".

(insulating sheet 50)
As shown in FIG. 2, one insulating sheet 50 is arranged inside each slot 23 . The insulating sheet 50 is arranged between the inner surface of the slot 23 and the outer surface of the coil 30 . The insulating sheet 50 covers the entire inner surface of the slot 23 . The insulating sheet 50 is, for example, open radially inwardly and axially on both sides, similar to the slot 23 . Both ends of the insulating sheet 50 in the axial direction protrude from the slots 23 . The insulating sheet 50 is made of a synthetic resin material. The insulating sheet 50 corresponds to an "insulator".

(Stator manufacturing device 60)
As shown in FIGS. 4 and 5 , a stator manufacturing apparatus 60 (hereinafter referred to as manufacturing apparatus 60 ) includes a pressing jig 70 . The pressing jig 70 radially presses the segment coil 40 arranged to extend in the axial direction inside the slot 23 toward the inner surface 23a of the slot 23 to plastically deform it.

(Press jig 70)
As shown in FIGS. 4 and 5, the pressing jig 70 has a plate shape extending in both the axial direction and the radial direction. The axial length of the pressing jig 70 is greater than the axial length of the segment coil 40 . The width of the pressing jig 70 is constant in the axial direction and substantially the same as the opening width of the insulating sheet 50 .

Examples of the material of the pressing jig 70 include metallic materials such as ferrous materials.
As shown in FIGS. 4 and 5, the pressing jig 70 has a pressing surface 71 that presses the arrangement portion 31 of the segment coil 40 along the entire axial direction.

The pressing surface 71 has a closest portion 72 , a first inclined portion 75 and a second inclined portion 76 .
The closest portion 72 is a portion of the pressing surface 71 that is closest to the inner surface 23a of the slot 23 in the radial direction.

The closest portion 72 is a flat portion 73 perpendicular to the radial direction. That is, the closest portion 72 extends both in the axial direction and in the width direction of the slot 23 .
The closest portion 72 is provided between the positions of both ends 20a and 20b of the stator core 20 in the axial direction.

The first slanted portion 75 and the second slanted portion 76 are portions that continue to the nearest portion 72 and are slanted away from the inner surface 23a in the radial direction as they move away from the nearest portion 72 in the axial direction.

The first inclined portion 75 continues to the first end 72a of the closest portion 72 in the axial direction, that is, the end on the first coil end 32 side.
The first inclined portion 75 extends outside the end 20a on the first coil end 32 side of both ends 20a and 20b of the stator core 20 in the axial direction.

The second inclined portion 76 continues to the second end 72b opposite to the first end 72a of the closest portion 72 in the axial direction, that is, the end on the second coil end 33 side.
The second inclined portion 76 extends outside the end 20b on the second coil end 33 side of both ends 20a and 20b of the stator core 20 in the axial direction.

Here, the angle α2 formed between the imaginary straight line V extending in the axial direction and the second inclined portion 76 is larger than the angle α1 formed between the imaginary straight line V and the first inclined portion 75 (α2>α1).
(Manufacturing method of stator)
A stator manufacturing method includes an insulating sheet arranging process, a coil arranging process, a pressing process, and a bonding process. In this embodiment, the insulating sheet arranging process, the coil arranging process, the pressing process, and the joining process are performed in this order. However, the coil placement process and the pressing process are repeated multiple times in this order.

(Insulation sheet placement process)
As shown in FIG. 6, in the insulating sheet placement step, an insulating sheet 50 is placed inside the slot 23 . At this time, the insulating sheet 50 may be inserted into the slot 23 from the inside in the radial direction, or may be inserted into the slot 23 from the axial direction.

(Coil placement process)
In the coil arrangement step, a plurality of segment coils 40 are arranged inside the slots 23 . In this embodiment, first, out of the total eight segment coils 40 arranged inside one slot 23 , five segment coils 40 are radially arranged inside the slot 23 .

In the coil placement step, the placement portion 31 having a width smaller than the width of the slot 23 , more specifically, a width smaller than the opening width of the insulating sheet 50 is placed inside the slot 23 . Therefore, a gap is provided between the placement portion 31 and the insulating sheet 50 in the width direction of the slot 23 . The coil arranging process corresponds to the "conductor arranging process".

(Pressing process)
As shown in FIGS. 7 and 8 , in the pressing step, the placement portion 31 of the segment coil 40 is pressed toward the inner surface 23 a of the slot 23 on the radially outer side by the pressing jig 70 . As a result, the placement portion 31 is plastically deformed along the inner surface 23 a of the slot 23 . Therefore, the gap between the arrangement portion 31 and the insulating sheet 50 described above is eliminated. Therefore, the width of the placement portion 31 is the same as the opening width of the insulating sheet 50 .

As shown in FIG. 9, the remaining two segment coils 40 are subjected to the coil arranging step and the pressing step in this order, and the remaining one segment coil 40 is subjected to the coil arranging step and the pressing step in this order. is done in In addition, in the remaining three segment coils 40, the coil placement step and the pressing step may be performed in this order.

(Joining process)
Although not shown, in the joining step, one first coil end 32 of each segment coil 40 is twisted in one circumferential direction by an annular twisting jig that engages with each first coil end 32, The other first coil end 32 is twisted in the other circumferential direction. As a result, the end of the first coil end 32 of the segment coil 40 and the end of the first coil end 32 of the segment coil 40 other than the segment coil 40 are radially adjacent to each other. Then, the coil 30 is manufactured by joining these ends by welding.

Next, the operation of this embodiment will be described.
As shown in FIG. 10 , the load when the pressing surface 71 of the pressing jig 70 presses the placement portion 31 of the segment coil 40 is the largest at the closest portion 72 .

Further, since the pressing surface 71 of the pressing jig 70 has the first inclined portion 75 and the second inclined portion 76, the end portion of the pressing surface 71 away from the closest portion 72 in the axial direction is The load is smaller than that of the portion 72 .

In addition, since the pressing surface 71 has the first inclined portion 75 and the second inclined portion 76, the load is prevented from abruptly changing in the axial direction.
From these, it is possible to suppress concentration of stress on the insulating sheet 50 at the positions of the ends 20a and 20b of the stator core 20 in the axial direction.

On the other hand, as shown in FIG. 11 , the conventional pressing jig 170 has a flat pressing surface 171 perpendicular to the radial direction of the stator core 20 . In this case, stress tends to concentrate on the insulating sheet 50 at the positions of the ends 20a and 20b of the stator core 20 in the axial direction.

Next, the effects of this embodiment will be described.
(1) The pressing jig 70 of the manufacturing apparatus 60 has a pressing surface 71 that presses the arrangement portion 31 of the segment coil 40 disposed inside the slot 23 along the entire axial direction. The pressing surface 71 has a closest portion 72 and a first inclined portion 75 and a second inclined portion 76 as inclined portions.

According to such a configuration, stress concentration on the insulating sheet 50 can be suppressed by exhibiting the above effects.
(2) The closest portion 72 has a flat portion 73 extending in the axial direction.

According to such a configuration, it is possible to expand the range pressed by the closest portion 72 of the placement portion 31 . Therefore, by increasing the ratio of the closest portion 72 to the pressing surface 71, that is, the ratio of the flat portion 73, the ratio of the portion of the arrangement portion 31 that is pressed by a uniform load can be increased. Therefore, the space factor of the coil 30 can be increased.

(3) The closest portion 72 is provided between the positions of both ends 20a and 20b of the stator core 20 in the axial direction. The first inclined portion 75 and the second inclined portion 76 as inclined portions extend to positions outside the ends 20a and 20b of the stator core 20 in the axial direction.

According to such a configuration, the load acting on the insulating sheet 50 at the positions of the ends 20a and 20b of the stator core 20 in the axial direction is relieved by the inclined portions. Therefore, it is possible to further suppress concentration of stress on the insulating sheet 50 at the positions of the ends 20a and 20b of the stator core 20 in the axial direction.

(4) The second inclined portion 76 extends toward the second coil end 33 in the axial direction.
In the segment coil 40, the two second coil ends 33 connected by the connecting portion 35 have a larger reaction force when pressed by the pressing jig 70 than the two independent first coil ends 32. It is easy to deform and difficult to plastically deform. Therefore, when the pressing surface 71 of the pressing jig 70 presses the placement portion 31 of the segment coil 40 , the end portion of the placement portion 31 on the second coil end 33 side is provided with a second coil end 31 to resist the reaction force. A larger load than the end on the 1 coil end 32 side acts. As a result, stress concentration is particularly likely to occur in a portion of the insulating sheet 50 that covers the end portion of the arrangement portion 31 on the second coil end 33 side.

In this respect, according to the above configuration, it is possible to suppress the stress concentration on the portion of the insulating sheet 50 where stress concentration is particularly likely to occur.
(5) The first inclined portion 75 extends outside the end 20a on the first coil end 32 side of both ends 20a and 20b of the stator core 20 in the axial direction. The second inclined portion 76 extends outside the end 20b on the second coil end 33 side of both ends 20a and 20b of the stator core 20 in the axial direction. The angle α2 formed between the imaginary straight line V extending in the axial direction and the second inclined portion 76 is larger than the angle α1 formed between the imaginary straight line V and the first inclined portion 75 (α2>α1).

According to such a configuration, the load acting on the portion of the insulating sheet 50 that covers the end 20b on the side of the second coil end 33 in the placement portion 31 forms a larger angle with the imaginary straight line V than with the second inclined portion 76 . 1 Slanted portion 75 allows further relief. Therefore, stress concentration on the above portion can be further suppressed.

(6) The stator manufacturing method includes a segment coil placement step of placing placement portions 31 of segment coils 40 inside slots 23 so as to extend in the axial direction of stator core 20 . The stator manufacturing method includes a pressing step of plastically deforming the placement portion 31 by pressing the placement portion 31 toward the inner surface 23 a of the slot 23 with a pressing jig 70 to form the coil 30 .

According to such a method, stress concentration on the insulating sheet 50 can be suppressed by exhibiting the above effects.
<Change example>
This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

The angle α2 formed between the virtual straight line V and the second inclined portion 76 is not limited to be larger than the angle α1 formed between the virtual straight line V and the first inclined portion 75, and may be less than or equal to the angle α1. For example, in the case of using a straight conductor wire without the connecting portion 35 instead of the segment coil 40, the angle α2 formed between the virtual straight line V and the second inclined portion 76 is set to 75 may be the same as the angle α1 (α1=α2).

- In the pressing surface 71 of the pressing jig 70 of the present embodiment, the first inclined portion 75 may be omitted, and the portion corresponding to the first inclined portion 75 may be configured by the closest portion 72 .
- For example, in the case of using a straight conductor wire without the connecting portion 35 instead of the segment coil 40, either one of the first inclined portion 75 and the second inclined portion 76 may be omitted. . Even in this case, the load is smaller at the end of the pressing surface 71 away from the closest portion 72 in the axial direction than at the closest portion 72 due to the provision of the inclined portion. As a result, concentration of stress on insulating sheet 50 at one end of stator core 20 in the axial direction can be suppressed.

- The first inclined portion 75 does not have to extend outside the end 20a of the stator core 20 on the first coil end 32 side in the axial direction. Also, the second inclined portion 76 does not have to extend outside the end 20b of the stator core 20 in the axial direction.

As shown in FIGS. 12 and 13, for example, the entire second inclined portion 76 is provided inside the end 20b of the stator core 20 in the axial direction. Further, the pressing surface 71 has an outer flat portion 78 on the side opposite to the closest portion 72 with the second inclined portion 76 interposed therebetween. The outer flat portion 78 extends in both the axial direction of the stator core 20 and the width direction of the slot 23 , similarly to the closest portion 72 .

- The closest portion 72 may not be a flat portion extending in the axial direction.
As shown in FIG. 14, the closest portion 72 may have no substantial length in the axial direction.

Further, as shown in FIG. 15, the entire pressing surface 71 may be inclined so as to be radially inward toward the second coil end 33 side in the axial direction. In this case, the portion of the pressing surface 71 corresponding to the position of the end 20 a of the stator core 20 in the axial direction serves as the nearest portion 72 , and the portion other than the nearest portion 72 serves as the second inclined portion 76 .

- The insulator is not limited to the insulating sheet 50 illustrated in this embodiment. The insulator may be arranged between the inner surface of the slot 23 and the coil 30 , and may be composed of a coating provided over the entire inner surface of the slot 23 .

10... Stator 20... Stator core (iron core)
DESCRIPTION OF SYMBOLS 20a... 1st end 20b... 2nd end 21... Yoke 22... Teeth 23... Slot 23a... Inner surface of slot 24... Fixing part 24a... Bolt hole 30... Coil 31... Placement part 32... First coil end 33... Second coil End 34... Straight part 35... Connection part 40... Segment coil 50... Insulating sheet (insulator)
DESCRIPTION OF SYMBOLS 60... Manufacturing apparatus of a stator 70... Pressing jig 71... Pressing surface 72... Most adjacent part 72a... First end 72b... Second end 73... Flat part 75... First inclined part 76... Second inclined part

Claims (7)

A cylindrical iron core having a plurality of slots, a coil arranged inside the slots, and an insulator arranged between the inner surface of the slot and the coil, wherein the coil A manufacturing apparatus for a plurality of armatures arranged side by side in a radial direction,
a pressing jig for forming the coil by pressing the conductor arranged inside the slot so as to extend in the axial direction of the iron core toward the inner surface of the slot in the radial direction to plastically deform it,
The pressing jig has a pressing surface that presses the arrangement portion of the conductor wire disposed inside the slot over the entire axial direction,
The pressing surface has a closest portion that is closest to the inner surface of the slot in the radial direction, and a closest portion that is continuous with the closest portion and is separated from the inner surface in the radial direction as the distance from the closest portion in the axial direction increases. a sloped portion;
Armature manufacturing equipment. The closest portion is a flat portion extending in the axial direction,
The armature manufacturing apparatus according to claim 1 . The inclined portion extends to the outside of the end of the core in the axial direction,
The armature manufacturing apparatus according to claim 1 or 2. The closest portion is provided between positions of both ends of the iron core in the axial direction,
The inclined portion includes a first inclined portion connected to a first end of the closest portion in the axial direction, and a second inclined portion connected to a second end opposite to the first end of the closest portion in the axial direction. a sloped portion;
The armature manufacturing apparatus according to any one of claims 1 to 3. The coil includes two placement portions respectively arranged inside the two slots different from each other, and two first coil ends extending from the two placement portions to one side in the axial direction and independent of each other. , a segment coil having two second coil ends extending from the two arrangement portions in the axial direction opposite to the one side, and a connecting portion connecting the second coil ends,
The inclined portion extends toward the second coil end side in the axial direction,
The armature manufacturing apparatus according to any one of claims 1 to 4. The closest portion is provided at a position between both ends of the iron core in the axial direction,
The inclined portion includes a first inclined portion connected to a first end of the closest portion in the axial direction, and a second inclined portion connected to a second end opposite to the first end of the closest portion in the axial direction. a sloped portion, and
The first inclined portion extends to the outside of both ends of the iron core in the axial direction beyond the end on the first coil end side,
The second inclined portion extends to the outside of both ends of the iron core in the axial direction beyond the end on the second coil end side,
The angle formed by the virtual straight line extending in the axial direction and the second inclined portion is larger than the angle formed by the virtual straight line and the first inclined portion.
The armature manufacturing apparatus according to claim 5 . A cylindrical iron core having a plurality of slots, a coil arranged inside the slots, and an insulator arranged between the inner surface of the slot and the coil, wherein the coil A method for manufacturing a plurality of armatures arranged side by side in a radial direction, comprising:
a conductor arranging step of arranging a conductor in the slot so as to extend in the axial direction of the iron core;
A pressing step of plastically deforming the conductive wire to form the coil by pressing the conductive wire toward the inner surface of the slot with the pressing jig according to any one of claims 1 to 6; have a
Armature manufacturing method.

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