阅读说明：本技术 线圈束成形装置 (Coil bundle forming device ) 是由 丹下宏司 于 2021-05-27 设计创作，主要内容包括：本发明提供一种线圈束成形装置,以能够容易地插入狭槽的方式成形线圈束。线圈束成形装置(100)插入定子铁芯的沿轴向贯通的多个狭槽,且成形卷绕线圈线而成的环状的线圈束的至少一部分,线圈束(10)具有从狭槽的轴向一侧向另一侧移动并容纳于狭槽内的两个线圈边部(11)和连接两个线圈边部(11)且配置于定子铁芯的轴向两侧的线圈跨接部(12),在线圈跨接部(12),多个线圈线沿定子铁芯的径向排列,在轴向另一侧的线圈跨接部(12),以使径向外侧的长度比径向内侧的长度短的方式成形。(The invention provides a coil bundle forming device, which can form a coil bundle in a mode of being easily inserted into a slot. A coil bundle forming device (100) is inserted into a plurality of slots penetrating in the axial direction of a stator core and forms at least a part of an annular coil bundle formed by winding coil wires, the coil bundle (10) has two coil side parts (11) moving from one side to the other side in the axial direction of the slots and being accommodated in the slots and a coil bridging part (12) connecting the two coil side parts (11) and being arranged on both sides in the axial direction of the stator core, the plurality of coil wires are arranged in the radial direction of the stator core at the coil bridging part (12), and the coil bridging part (12) on the other side in the axial direction is formed in a manner that the length on the radial outer side is shorter than the length on the radial inner side.)

1. A coil bundle shaping device for shaping at least a part of an annular coil bundle around which a coil wire is wound by inserting a plurality of slots penetrating in an axial direction of a stator core,

the coil bundle includes:

two coil side portions that move from one side to the other side in the axial direction of the slot and are accommodated in the slot; and

coil bridge parts which connect the two coil side parts and are arranged on both sides of the stator core in the axial direction,

a plurality of the coil wires are arranged in a radial direction of the stator core at the coil crossover part,

the coil bridging portion on the other axial side is formed so that the length on the radially outer side is shorter than the length on the radially inner side.

2. The coil beam shaping device according to claim 1,

the disclosed device is provided with:

a plurality of needle bars that are arranged side by side in a circumferential direction of the stator core on a radially inner side of the stator core, extend in an axial direction of the stator core, and hold the coil; and

a loop moving mechanism which is disposed radially inside the needle bar, moves in an axial direction, and moves the loop bundle from one side in the axial direction to the other side,

the coil moving mechanism includes a convex portion provided at the other end in the axial direction and protruding toward the other side in the axial direction,

at least a part of the convex portion is configured such that a height position of the other side in the axial direction of the convex portion decreases toward a radially inner side.

3. The coil beam shaping device according to claim 2,

the radial moving mechanism is disposed radially inward of the convex portion and moves in the radial direction.

4. The coil beam shaping device according to claim 2 or 3,

the needle bar winding device further includes an axial moving mechanism disposed radially inward of the plurality of needle bars, disposed on the other axial side of the loop moving mechanism, and moving in the axial direction.

5. The coil beam shaping device according to claim 4,

the axial moving mechanism includes a protruding portion protruding toward a radially outer portion of the protruding portion toward one axial side.

6. The coil beam shaping device according to claim 4 or 5,

further comprises a radial moving mechanism which is disposed on the radial inner side of the convex part and moves in the radial direction,

the convex part has:

a first portion axially opposed to the protruding portion; and

a second portion which is opposed to the radial moving mechanism in a radial direction,

the first portion is located radially outward of the second portion.

7. The coil beam shaping device according to any one of claims 4 to 6,

further comprises a radial moving mechanism which is disposed on the radial inner side of the convex part and moves in the radial direction,

the axial moving mechanism moves the radial moving mechanism in the radial direction by moving in the axial direction.

8. The coil beam shaping device according to claim 7,

at least one of the axial movement mechanism and the radial movement mechanism has an inclined surface that contacts the other.

9. The coil beam shaping device according to claim 7 or 8,

the coil moving mechanism has a hollow portion on the other axial side,

the axial moving mechanism and the radial moving mechanism are disposed in the hollow portion.

10. The coil beam shaping device according to claim 9,

the radial moving mechanism has an opening on the other axial side,

the axial moving mechanism is disposed in the opening.

Technical Field

The present invention relates to a coil bundle forming device.

Background

Conventionally, a method of manufacturing a stator by inserting a coil into a slot of a stator core is known. For example, japanese patent application laid-open No. 2000-125521 (patent document 1) discloses a coil insertion device for inserting an annular coil into a slot of a stator core.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2000-125521

Disclosure of Invention

Problems to be solved by the invention

By using the coil insertion device of patent document 1, it is possible to accommodate two coil sides of the annular coil in the slot, and to dispose the coil bridging portions connecting the two coil sides on both sides in the axial direction of the stator core.

However, the present inventors have focused on the problem that it is difficult to perform the step of inserting the annular coil into the slot using the coil insertion device of patent document 1. The present inventors have found that this problem is caused by the coil being inclined, and therefore the length of the radially outer side of the coil bridge portion becomes excessive, while the length of the radially inner side of the coil bridge portion becomes insufficient.

In view of the above, the present invention provides a coil bundle shaping device that shapes a coil bundle so as to be easily inserted into a slot.

Means for solving the problems

A coil bundle shaping device according to a first aspect of the present invention is a coil bundle shaping device that inserts a plurality of slots that penetrate in an axial direction of a stator core and shapes at least a part of an annular coil bundle around which a coil wire is wound, the coil bundle having: two coil sides which move from one side to the other side in the axial direction of the slot and are accommodated in the slot; and a coil crossover section that connects the two coil side sections and is disposed on both sides of the stator core in the axial direction, wherein the plurality of coil wires are arranged in the radial direction of the stator core at the coil crossover section, and the coil crossover section on the other side in the axial direction is formed so that the length on the outer side in the radial direction is shorter than the length on the inner side in the radial direction.

Effects of the invention

The present invention can provide a coil bundle shaping device that shapes a coil bundle so as to be easily inserted into a slot.

Drawings

Fig. 1 is a schematic view of a cross section of a stator perpendicular to an axial direction.

Fig. 2 is a schematic view of a coil beam shaping apparatus according to an embodiment of the stereoscopic view.

Fig. 3 is a schematic view of a coil beam shaping apparatus according to an embodiment of the stereoscopic view.

Fig. 4 is a schematic view of a coil beam shaping apparatus according to an embodiment of the stereoscopic view.

Fig. 5 is a schematic view of a cross section of the coil bundle shaping device of the embodiment along the axial direction.

Fig. 6 is a schematic view of a cross section of the coil bundle shaping device of the embodiment along the axial direction.

Fig. 7 is a flowchart showing a coil beam shaping method according to the embodiment.

Fig. 8 is a schematic view of a cross section of a coil bundle shaping device according to a modification along the axial direction.

In the figure:

1-stator, 10-coil bundle, 11-coil edge, 12a, 12 b-coil bridge, 20-stator core, 21-slot, 100-coil bundle forming device, 110, 111, 112-needle bar, 120-stripper, 121 a-hollow, 122-convex, 123-first, 124-second, 130-radial moving mechanism, 131-inclined, 133-opening, 140-axial moving mechanism, 142-projection, 144-inclined.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference characters, and description thereof will not be repeated.

In the following description, the direction in which the central axis of the stator 1 extends, that is, the penetrating direction of the slots is referred to as the "axial direction". The axial direction is not particularly limited, and includes a vertical direction, a horizontal direction, a direction intersecting these directions, and the like.

The direction perpendicular to the central axis of the stator 1 is referred to as a "radial direction". One side in the radial direction is an inner side, and the other side is an outer side. The direction along an arc centered on the central axis of the stator 1 is referred to as the "circumferential direction".

In addition, for the purpose of emphasizing characteristic portions, the drawings used in the following description may be enlarged to show characteristic portions for convenience. Thus, the size and ratio of each component are not necessarily the same as those of the actual component. For the same purpose, portions that are not characteristic may be omitted and illustrated.

(stator)

As shown in fig. 1, the stator 1 is a component of a motor, and interacts with a rotor, not shown, to generate a rotational torque. The stator 1 of the present embodiment is wound in a distributed manner with a coil wound across several slots 21. The stator 1 includes a coil bundle 10 and a stator core 20.

< stator core >

The stator core 20 is formed in a hollow cylindrical shape. The stator core 20 is formed by overlapping thin silicon steel plates. A plurality of teeth 23 are radially formed in the stator core 20. Slots 21 are formed between the teeth 23. The teeth 23 extend radially across the slot 21. The slit 21 has a slit opening 22 as a radial opening. The stator core 20 of the present embodiment is an integrated stator core.

< coil bundle >

As shown in fig. 2, the coil bundle 10 is formed by winding a coil wire in a loop shape. That is, the coil bundle 10 is a ring-shaped coil. The coil wire of the present embodiment is a round wire, but is not particularly limited thereto, and may be a flat wire or the like.

The coil bundle 10 has two coil side portions 11 and a coil bridging portion 12. The two coil sides 11 are accommodated in the slots 21. Specifically, the slit 21 for accommodating one coil side 11 is different from the slit 21 for accommodating the other coil side 11. The slit 21 for accommodating one coil side 11 and the slit 21 for accommodating the other coil side 11 may be adjacent to each other, or may be arranged in the circumferential direction with another slit 21 interposed therebetween.

The coil side 11 is wound neatly. That is, in the regular winding, the coil side portions 11 are regularly stacked in a predetermined direction. The coil side portions 11 of the present embodiment are regularly stacked in the circumferential direction in the slots 21, but are not limited thereto.

The coil bridge 12 connects the two coil sides 11. The coil bridge portions 12 are disposed on both sides in the axial direction. Specifically, the coil bridge portion 12 located on one axial side is a coil end on one side that connects one end portions of the two coil side portions 11. The coil bridge portion 12 located on the other axial side is the other-side coil end that connects the other end portions of the coil side portions 11.

A plurality of coil wires are arranged in the radial direction of the stator core 20 at the coil bridging portion 12. Therefore, the coil bridge portions 12 are constituted by the coil bridge portions 12a located radially outward and the coil bridge portions 12b located radially inward. In the present embodiment, at the coil bridge portion 12, the plurality of coil wires are arranged in the radial direction, and the plurality of coil wires are arranged in a cross-sectional view in the circumferential direction.

(coil bundle forming device)

Fig. 2 to 4 are schematic diagrams of respective processes of inserting the coil bundle 10 into the slot 21 by the coil bundle forming device 100 in a perspective view. Fig. 2 to 4 show a part of the structure of the coil bundle shaping device 100 without illustration. Fig. 5 schematically shows a state after cutting in the axial direction in order to show the main structure of the coil bundle shaping apparatus 100. Fig. 6 shows a step of forming one coil bundle in fig. 5. The coil bundle forming apparatus 100 will be described with reference to fig. 2 to 6.

The coil bundle forming device 100 inserts a plurality of slots 21 penetrating in the axial direction of the stator core 20, and forms at least a part of an annular coil bundle in which a coil wire is wound. The coil bundle shaping device 100 is shaped such that the length on the radially outer side is shorter than the length on the radially inner side at the coil crossover portion 12 on the other axial side.

In addition, the coil bundle forming apparatus 100 according to the present embodiment inserts the coil bundle 10 in which the coil wire is wound in a ring shape into the plurality of slots 21 penetrating in the axial direction of the stator core 20. In detail, the coil bundle forming device 100 inserts the coil bundles 10 from the respective slot openings 22 so as to cross the two slots 21 of the stator core 20.

The loop harness forming apparatus 100 includes a plurality of needle bars 110 shown in fig. 2 to 4, a stripper 120 as a loop moving mechanism, a radial moving mechanism 130 shown in fig. 5 and 6, and an axial moving mechanism 140.

< needle bar >

As shown in fig. 2 to 4, the plurality of needle bars 110 hold the loop bundle 10. The needle bars 110 are arranged side by side in the circumferential direction of the stator core 20 on the radially inner side of the stator core 20. The needle bar 110 extends in the axial direction of the stator core 20. Specifically, the plurality of needle bars 110 are arranged on the same circumference corresponding to the teeth 23. The loop bundle 10 can be easily inserted into the slot 21 using the needle bar 110.

The needle bar 110 of the present embodiment is composed of two needle bars 111, 112. The needle bars 111, 112 are disposed with the plurality of teeth 23 therebetween. The needle bars 111 and 112 guide one coil bundle 10 hung on a stripper 120 described later to the slot 21 in the axial direction and the radial direction. The needle bars 111, 112 are rod-shaped members extending in the axial direction. The needle bars 111, 112 are movable in the axial direction.

< stripper >

The stripper 120 as a coil moving mechanism is disposed radially inward of the stator core 20. The stripper 120 moves in the axial direction of the stator core 20. That is, the detacher 120 moves the coil bundle 10 from one axial side to the other axial side. A stripper 120 inserts a part of the coil bundle 10 from the slot opening 22 into the slot 21 while moving the coil bundle 10 in the axial direction on the radial inner side of the stator core 20. Specifically, the stripper 120 catches the radially inner side of the loop bundle 10 to lift the loop bundle 10 up along the needle bar 110.

As shown in fig. 2 to 6, the stripper 120 includes a body portion 121 and a convex portion 122. The body 121 and the projection 122 may be formed of one member or may be formed of different members.

The body 121 has a hollow portion 121a on the other axial side. In fig. 2 to 4, the body 121 has a cylindrical shape having a hollow portion 121a penetrating in the axial direction.

The convex portion 122 is provided at the other end in the axial direction and protrudes toward the other side in the axial direction. Specifically, the convex portion 122 is provided at the other axial end of the body portion 121, and protrudes from the other axial end toward the other axial end.

At least a part of the convex portion 122, the height position of the other side in the axial direction of the convex portion 122 decreases toward the radially inner side. That is, at least a part of the projection 122 is expanded in diameter toward one axial side. In fig. 5, the height position of the other side in the axial direction of the convex portion 122 gradually decreases toward the radially inner side in substantially the entire convex portion 122 except for the radially outermost peripheral portion.

As shown in fig. 5 and 6, the convex portion 122 has a first portion 123 and a second portion 124. The first portion 123 and the second portion 124 may be formed of one member or may be formed of different members.

The first portion 123 axially faces a projection 142 described later. The second portion 124 is radially opposed to the radial movement mechanism 130. The second portion 124 is also axially opposed to the radial moving mechanism 130. That is, the second portion 124 does not face the protruding portion 142. The first portion 123 is located radially outward of the second portion 124.

The radial movement mechanism 130 is disposed radially inward of the convex portion 122. Specifically, the radial outer position of the radial movement mechanism 130 is located inward of the radial outer position of the convex portion 122.

The radial movement mechanism 130 moves in the radial direction. The loop bundle 10 held by the needle bar 110 is compressed from the radially inner side by the radial moving mechanism 130. Specifically, the radial movement mechanism 130 is radially opposed to the second portion 124 of the convex portion 122. Thereby, the radially inner portion of the coil bundle 10 can be compressed in the radial direction by the second portion 124 of the convex portion 122 and the radial movement mechanism 130.

The radial movement mechanism 130 is disposed in the hollow portion 121a of the stripper 120. Further, the radial movement mechanism 130 may have a case of being located in the hollow portion 121a of the stripper 120 and a case of not being located in the hollow portion 121a of the stripper 120 by moving in the radial direction.

A portion of the radial moving mechanism 130 contacts the axial moving mechanism 140 and the stripper 120 as it moves radially. Specifically, the radial movement mechanism 130 has an inclined surface 131 that contacts the axial movement mechanism 140. The inclined surface 131 is inclined radially outward toward the other axial side. The radial movement mechanism 130 has a flat surface 132 that contacts the body 121 of the stripper 120. The flat surface 132 extends in the axial direction.

The radial movement mechanism 130 has an opening 133 on the other axial side. In fig. 5, the radial movement mechanism 130 has an opening 133 that penetrates in the axial direction. The opening 133 has the same or larger opening width toward the other axial side.

As shown in fig. 6, the axial movement mechanism 140 is disposed radially inward of the plurality of needle bars 110. As shown in fig. 5 and 6, the axial moving mechanism 140 is disposed on the other axial side of the stripper 120. Specifically, the other axial position of the axial movement mechanism 140 is located on the other side than the other axial position of the projection 122. The position radially outward of the axial movement mechanism 140 is the same as or outward of the position radially outward of the convex portion 122. The radially outer position of the axial movement mechanism 140 is located outward of the radially outer position of the radial movement mechanism 130.

The axial moving mechanism 140 moves in the axial direction. The axial moving mechanism 140 performs a movement close to the boss 122 and a movement away from the boss 122. The loop bundle 10 held by the needle bar 110 is compressed from the other axial side by the axial moving mechanism 140. Specifically, the axial moving mechanism 140 approaches the convex portion 122, and the coil bridging portion 12a on the radially outer side can be compressed in the axial direction by the axial moving mechanism 140 and the convex portion 122.

The axial moving mechanism 140 is disposed in the hollow portion 121a of the stripper 120. Further, the axial moving mechanism 140 may have a case of being located in the hollow portion 121a of the stripper 120 and a case of not being located in the hollow portion 121a by moving in the axial direction. This makes it possible to compactly configure the coil bundle forming apparatus 100 including the detacher 120, the axial movement mechanism 140, and the radial movement mechanism 130.

The axial movement mechanism 140 includes a body 141, a projection 142, and a coupling 143. The body 141, the protrusion 142, and the connection portion 143 may be formed of one member or may be formed of different members.

The body portion 141 extends in the axial direction. The body 141 of the axial movement mechanism 140 is disposed in the opening 133 of the radial movement mechanism 130. Further, the body 141 may be moved in the axial direction to have a case of being located in the opening 133 of the radial movement mechanism 130 and a case of not being located in the opening 133. This makes it possible to compactly configure the coil bundle forming apparatus 100 including the detacher 120, the axial movement mechanism 140, and the radial movement mechanism 130. Further, another part of the axial movement mechanism 140 may be disposed in the opening 133 of the radial movement mechanism 130.

The protruding portion 142 is located radially outward of the main body portion 141. The portion of the projection 142 facing the radially outer side of the projection 122 projects to one axial side. Thereby, the radially outer coil bridging portion 12b can be compressed in the axial direction by the radially outer portion of the convex portion 122 of the stripper 120 and the protruding portion 142 of the axial movement mechanism 140. Specifically, the protruding portion 142 extends in the axial direction toward the first portion 123 of the convex portion 122. Thereby, the coil bridging portion 12b on the radially outer side can be compressed in the axial direction by the first portion 123 and the protruding portion 142.

The axial end surface of the projection 142 is a flat surface extending in the radial direction or an inclined surface inclined inward in the radial direction. The protruding portion 142 comes into contact with the coil bridging portion 12 on the other axial side by moving in the axial direction to approach the first portion 123 of the convex portion 122.

The connecting portion 143 connects the body 141 and the protruding portion 142. The coupling portion 143 extends in the radial direction.

The axial moving mechanism 140 moves the radial moving mechanism 130 in the radial direction by moving in the axial direction. This can reduce the number of components for moving the radial movement mechanism 130 in the radial direction. Further, the radial movement mechanism 130 may move the axial movement mechanism 140 in the axial direction by moving in the radial direction.

A part of the axial moving mechanism 140 is in contact with the radial moving mechanism 130 with the movement in the axial direction. In detail, the axial moving mechanism 140 has an inclined surface 144 that contacts the radial moving mechanism 130. The inclined surface 144 is inclined radially outward toward the other axial side. The inclined surface 144 is formed on the body 141. When at least one of the axial movement mechanism 140 and the radial movement mechanism 130 has the inclined surfaces 144 and 131 which come into contact with the other, a device for moving the radial movement mechanism 130 in the radial direction by the axial movement of the axial movement mechanism 140 can be easily realized.

(coil bundle forming method and coil inserting method)

Next, a coil bundle forming method and a coil inserting method according to the present embodiment will be described with reference to fig. 1 to 7. The coil forming method and the coil inserting method according to the present embodiment are a forming method and an inserting method of the coil bundle 10 using the coil bundle forming apparatus 100 described above.

First, as shown in fig. 2 and 7, the coil wire is wound in a ring shape to form the coil bundle 10 having the two coil sides 11 accommodated in the slots 21 and the coil bridges 12 connecting the two coil sides 11 and disposed on both sides of the stator core 20 in the axial direction (step S10). In this step (step S10), a coil wire of a round wire is used. Specifically, for example, the coil wire is wound in a loop shape using a winding die to form the coil bundle 10.

Then, the coil bundle forming device 100 is installed on the stator core 20 (step S20). In this step (step S20), the needle bars 111 and 112 are arranged radially inward of the stator core 20. Further, the coil bundle 10 is disposed axially below the needle bars 111, 112. Specifically, the coil bundle 10 is disposed so as to be supported between the needle bars 111 and 112. The stripper 120 is disposed axially downward at the center in the radial direction of the plurality of blades 111 and 112.

Then, as shown in fig. 3, the coil bundle 10 is moved to the other side in the axial direction by the detacher 120 as the coil moving mechanism (step S30). In fig. 3, the stripper 120 is advanced toward the other axial side. At this time, the inner side of the coil bundle 10 is lifted up toward the other axial side in a state of being caught by the detacher 120. As shown in fig. 4, when the coil bundle 10 is moved further to the other side in the axial direction, the coil side portion 11 is inserted into the slit 21 in a state where the coil bundle 10 is inclined inward in the radial direction.

When the coil bundle 10 is moved by the detacher 120 (step S30), the coil wires constituting the coil bundle 10 are aligned along the convex portions 122 whose heights decrease toward the inside in the radial direction.

Then, the coil bridge 12 on the other axial side is formed (step S40). In this step (step S40), the coil bridging portion 12 on the other axial side is formed so that the length on the radially outer side is shorter than the length on the radially inner side. Specifically, this step (step S40) is performed as follows.

As shown in fig. 6, the radial movement mechanism 130 is disposed radially inward of the convex portion 122. The axial movement mechanism 140 is disposed radially inward of the needle bars 111 and 112 and axially on the other side of the stripper 120. When the axial movement mechanism 140 is moved to one axial side, the inclined surface 144 of the axial movement mechanism 140 contacts the inclined surface 131 of the radial movement mechanism 130, and the radial movement mechanism 130 moves radially outward. Thus, the axial moving mechanism 140 moves the radial moving mechanism 130 in the radial direction by the axial movement.

The axial movement mechanism 140 moves to one axial side and approaches the convex portion 122, and the axial movement mechanism 140 and the convex portion 122 come into contact with the coil bridge portion 12 on the other axial side. Specifically, the protrusion 142 of the axial movement mechanism 140 moves to one axial side and approaches the first portion 123 of the protrusion 122, and the protrusion 142 and the protrusion 122 come into contact with the coil bridge 12 on the other axial side. Since the height position of the other axial side of the convex portion 122 decreases toward the radially inner side, the tension applied to the coil bridge portion 12 of the other axial side by the protruding portion 142 decreases toward the radially inner side. That is, the protruding portion 142 of the axial movement mechanism 140 approaches the protruding portion 122, and the coil bridging portion 12a on the radially outer side can be compressed in the axial direction by the protruding portion 142 and the protruding portion 122. Specifically, the first portion 123 of the projection 122 and the projection 142 can axially compress the radially outer portion of the coil bundle 10. Therefore, the length of the coil bridge portion 12a positioned radially outward can be formed shorter than the length of the coil bridge portion 12b positioned radially inward.

In addition, the radial movement mechanism 130 moves in the radial direction and approaches the convex portion 122, so that the radial movement mechanism 130 comes into contact with the coil bundle 10. Therefore, the loop bundle 10 held by the needle bar 110 can be compressed from the radially inner side. In detail, the radial movement mechanism 130 moves in the radial direction and approaches the second portion 124 of the convex portion 122, so that the radial movement mechanism 130 contacts the coil bundle 10. Therefore, the radially inner portion of the coil bundle 10 can be radially compressed by the second portion 124 of the convex portion 122 and the radial movement mechanism 130.

Then, the inclined coil bundle 10 is pressed radially outward, and the coil bundle 10 is inserted into the slit 21 (step S40). In this step (step S40), the coil bridging portion 12 on the other inclined axial side is inclined radially outward (in the direction of arrow a in fig. 4). The moving distance of the coil bridging portion 12b on the radially inner side to the slit 21 is longer than the moving distance of the coil bridging portion 12a on the radially outer side to the slit 21. In the forming step (step S40), the coil bridge portions 12b on the radially inner side are formed so as to have a length longer than that of the coil bridge portions 12a on the radially outer side. Therefore, the length of the radially inner coil bridging portion 12b having a long moving distance is ensured, and thus the inclined coil bundle 10 can be easily moved radially outward.

The step of forming the coil bundle using the coil bundle forming device 100 (step S40) may be performed simultaneously with the step of inserting the coil bundle into the slit 21 (step S50), or may be performed before the step of inserting the coil bundle into the slit 21 (step S50).

Then, the coil bundle forming device 100 is detached from the stator core 20 (step S60). Specifically, the needle bar 110 is detached. The stripper 120 is moved downward. The radial movement mechanism 130 and the axial movement mechanism 140 are removed.

By performing the above steps (steps S10 to S60), the coil bundle 10 in which the coil wire is wound in a ring shape can be inserted into the plurality of slots 21 penetrating in the axial direction of the stator core 20. Thus, the stator 1 shown in fig. 1 can be manufactured.

In the present embodiment, the two slots 21 into which the coil is inserted are provided as one slot 21 and the other slot 21 of the three slots 21, but the present invention is not limited thereto. In addition, in the present embodiment, a method of inserting one coil bundle 10 into two slots 21 is exemplified. It is also possible to insert a plurality of coil bundles 10 into four or more slots 21 at the same time.

(action)

The coil bundle shaping device 100 of the present embodiment is configured such that the length on the radial outer side is shorter than the length on the radial inner side at the coil bridge portion 12 on the other axial side. Thus, the radially outer side of the coil bridge portion 12a on the other axial side is formed to be shorter than the radially inner side of the coil bridge portion 12b on the other axial side. By shaping the coil bundle 10 in this way, when the inclined coil bundle 10 is pressed radially outward of the slit 21 for insertion into the slit 21, the length of the coil bridging portion 12b radially inward is ensured. Therefore, according to the coil bundle shaping device 100 of the present embodiment, the coil bundle 10 can be shaped so as to be easily inserted into the slit 21.

Here, the stripper 120 as a coil moving mechanism for moving the coil bundle 10 includes a convex portion 122 protruding toward the other side in the axial direction. Therefore, when the coil bundle 10 is moved by the stripper 120, the coil wires constituting the coil bundle 10 are aligned along the convex portions 122. The height position of the other axial side of the projection 122 decreases toward the radially inner side. Therefore, the tension applied to the coil bridge 12 on the other axial side decreases toward the radially inner side. Thus, when the coil bundle 10 is inserted into the slot 21, the coil bundle 10 is shaped such that the length of the radially outer side of the coil bridge 12a is relatively short and the length of the radially inner side of the coil bridge 12b is relatively long.

[ modified examples ]

In the above-described embodiment, the stripper 120 as the coil moving mechanism is used to form the coil bridge 12 on the other axial side so that the length on the radially outer side is shorter than the length on the radially inner side, but the present invention is not limited to the formation by the stripper 120. The coil bridging portion 12 on the other axial side may be formed by a member different from the stripper 120 so that the length on the radially outer side is shorter than the length on the radially inner side.

The shapes of the radial movement mechanism 130 and the axial movement mechanism 140 of the coil bundle shaping device 100 are not limited, and may be, for example, the shapes shown in fig. 8. Specifically, the inclined surface 131 of the radial movement mechanism 130 and the inclined surface 144 of the axial movement mechanism 140 are inclined radially inward as they go to the other axial side. The radial movement mechanism 130 and the axial movement mechanism 140 may be omitted.

The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the claims, rather than the embodiments described above, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.