CN115882677A - Coil insertion device - Google Patents

Abstract

The coil insertion device is a coil insertion device that inserts a coil into a plurality of slots that penetrate in an axial direction of a stator core by relatively moving the coil from one side to the other side in the axial direction, and includes a plurality of blades that are arranged in a circumferential direction of the stator core on a radially inner side of the stator core, extend in the axial direction, and hold the coil, and at least one of the blades includes, when viewed in the axial direction: a first end point located on one circumferential side in the radially outer end edge; a second end point located on the other circumferential side in the radially outer end edge; a first wire extending radially inward from the first end point; and a second line extending radially inward from the second end point and including a radially inner end edge of the blade, the radially inner end edge being located in an area including the second end point out of two areas divided by a straight line passing through a midpoint of the first end point and the second end point and extending in the radial direction.

Description

Coil insertion device

Technical Field

The present invention relates to a coil inserting apparatus.

Background

Conventionally, a coil insertion device for inserting a coil into a slot of a stator core is known. For example, japanese patent laying-open No. 2000-125521 (patent document 1) discloses the following technique: the coils are held by first and second movable blades 37, 39, and the first and second movable blades 37, 39 are alternately arranged corresponding to the internal teeth of the cylindrical stator core and are movable relative to each other in the axial direction.

Documents of the prior art

Patent literature

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

Disclosure of Invention

However, in the above patent document 1, there is a problem that a load generated in the coil due to friction with the blade is large.

The invention aims to provide a coil inserting device for reducing load generated on a coil.

A coil insertion device according to a first aspect of the present invention is a coil insertion device for inserting a coil into a plurality of slots that penetrate in an axial direction of a stator core by relatively moving the coil from one side to the other side in the axial direction, the coil insertion device including a plurality of blades that are arranged in a row in the circumferential direction of the stator core on a radially inner side of the stator core, extend in the axial direction, and hold the coil, at least one of the blades including, when viewed in the axial direction: a first end point located on one circumferential side in the radially outer end edge; a second end point located on the other circumferential side in the radially outer end edge; a first wire extending radially inward from the first end point; and a second line extending radially inward from the second end point and including a radially inner end edge of the blade, the radially inner end edge being located in an area including the second end point out of two areas divided by a straight line passing through a midpoint of the first end point and the second end point and extending in the radial direction.

Effects of the invention

The invention can provide a coil insertion device for reducing load generated on a coil.

Drawings

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

Fig. 2 is a perspective view of the stator of the embodiment.

Fig. 3 is a schematic diagram showing a coil inserting apparatus.

Fig. 4 is a schematic view showing a coil inserting apparatus.

Fig. 5 is a schematic view showing a coil inserting apparatus.

Fig. 6 is a schematic view showing the blade as viewed in the axial direction.

Fig. 7 is a schematic view showing one step of the stator manufacturing method as viewed in the axial direction.

Fig. 8 is a schematic view showing a peeling apparatus.

Fig. 9 is a flowchart showing a coil insertion method, and is a schematic diagram showing one process.

Fig. 10 is a schematic view showing a blade of a comparative example.

Detailed Description

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

In the following description, a direction in which the center axis of the stator 1 extends, that is, a direction in which the slots penetrate is referred to as an "axial direction". One side along the axial direction is set as a lower side, and the other side is set as an upper side. The vertical direction is a direction used for specifying the positional relationship, and is not limited to an actual direction. That is, the downward direction does not necessarily mean the gravitational 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 center 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. A direction along an arc centered on the center axis of the stator 1 is referred to as a "circumferential direction".

In the drawings used in the following description, for the purpose of emphasizing characteristic portions, characteristic portions may be shown enlarged for convenience. Therefore, the size and the ratio of each component are not necessarily the same as those in actual cases. Note that, for the same purpose, non-characteristic portions may be omitted from the drawings.

(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 formed as a distributed winding in which a coil is wound across several slots 21. The stator 1 includes a coil 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 pole teeth 23 are radially formed on the stator core 20. Slots 21 are formed between the teeth 23. The teeth 23 extend radially across the slot 21. A groove opening 22 as a radial opening portion is formed in the groove 21. The stator core 20 of the present embodiment is an integrated stator core.

< coil >

The coil 10 is formed by winding a coil wire in a ring shape. 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 10 has two coil side portions and a coil transition portion. The two coil sides are housed in the grooves 21. Specifically, the groove 21 that accommodates one coil side is different from the groove 21 that accommodates the other coil side. The groove 21 for accommodating one coil side portion and the groove 21 for accommodating the other coil side portion may be arranged in the circumferential direction with another groove interposed therebetween as shown in fig. 1, or may be adjacent to each other (not shown).

(coil inserting apparatus)

The coil insertion device 100 will be described with reference to fig. 1 to 8. As shown in fig. 1, the coil insertion device 100 inserts the coil 10 into a plurality of slots 21 that penetrate in the axial direction of the stator core 20 by relatively moving the coil 10 from one side to the other side in the axial direction (from the right side to the left side in fig. 3 to 5). Specifically, the coil insertion device 100 inserts the coil 10, in which the coil wire is wound in a ring shape, from each slot opening 22 so as to straddle the two slots 21 of the stator core 20.

As shown in fig. 2, the coil 10 inserted into the coil insertion device 100 of the present embodiment includes a first coil 11 and a second coil 12. The first coil 11 is formed by winding a coil wire around a first bobbin. The second coil 12 is formed by winding a coil wire around a second bobbin. The first bobbin and the second bobbin may be the same shape or different shapes. Here, the first bobbin is smaller than the second bobbin. Therefore, the coil 10 includes a small coil in a ring shape as the first coil 11 and a large coil in a ring shape as the second coil 12 including the small coil.

As shown in fig. 3 to 5, the coil inserting apparatus 100 includes a plurality of blades 110 and a peeling apparatus 120 as a coil moving mechanism.

< blade >

As shown in fig. 2, the plurality of blades 110 hold the coil 10. The blades 110 are arranged in a row in the circumferential direction of the stator core 20 on the radially inner side of the stator core 20 and extend in the axial direction. The plurality of blades 110 allows the coil 10 to be easily inserted into the slot 21.

The blade 110 is disposed across the plurality of pole teeth 23. The blade 110 guides the coil 10 hooked on the peeling apparatus 120 described later to the groove 21 in the axial direction and the radial direction. The blade 110 has a shape that can be disposed in the slot opening 22. The blades 110 are rod-like members extending in the axial direction. The vane 110 is a movable vane that moves in the axial direction.

The radially outer end edge of the vane 110 in the present embodiment is located radially inward of the radially inner end edge of the stator core 20, but may be located radially outward of the radially inner end edge of the stator core 20.

The blade 110 is moved in the axial direction by a blade driving unit (not shown). In detail, the vane 110 can move toward the other side in the axial direction as well as toward one side in the axial direction. The blade driving unit includes a member attached to the blade 110 and pressed in the axial direction, and a driving source for moving the member in the axial direction.

As shown in fig. 6, at least one of the plurality of blades 110 has an asymmetrical shape when viewed axially. At least one of the plurality of blades 110 may not have the shape shown in fig. 6, but here, all of the plurality of blades 110 have the shape shown in fig. 6 when viewed in the axial direction. In addition, the plurality of blades 110 extend in the axial direction in the shape shown in fig. 6.

The blade 110 includes a first end point 111, a second end point 112, a first line 113, and a second line 114 in the axial direction.

The first end 111 is located on one circumferential side of the radially outer end edge E. In fig. 6, the first end 111 is located at the outermost side in the radial direction and at the outermost side in the circumferential direction. That is, the first end 111 is the radial outer end E and the circumferential one-side end. The first end point 111 is in contact with the stator core 20.

The second end point 112 is located on the other circumferential side of the radially outer end edge E. In fig. 6, the second end point 112 is located on the other circumferential side and the radially outermost side. That is, the second end 112 is the radially outer end E and the circumferentially other end. The second end point 112 is in contact with the stator core 20.

The first line 113 extends radially inward from the first end point 111. The side including the first wire 113 is in contact with the coil 10.

A second line 114 extends radially inward from the second end point 112 and includes a radially inner end edge 115 of the blade 110. The side including the second line 114 is not in contact with the coil 10.

The radially inner end edge 115 is located in a region including the second end point 112 out of two regions divided by a straight line L passing through a midpoint between the first end point 111 and the second end point 112 and extending in the radial direction. That is, the radially inner end edge 115 is not located in the region including the first end point 111 of the two regions divided by the straight line L. Accordingly, when the coil 10 is inserted into the slot 21, the side surface of the blade 110 including the first wire 113 is arranged to contact the coil 10, whereby the contact area between the blade 110 and the coil 10 can be increased as compared with a blade having a line-symmetric shape as in patent document 1. Therefore, the pressure generated by the friction between the coil 10 and the blade 110 can be reduced. Therefore, the load generated on the coil due to the friction between the coil 10 and the blade 110 can be reduced.

The radially inner end edge 115 is an intersection of the first line 113 and the second line 114. That is, the intersection point is located innermost in the radial direction.

In the present embodiment, the first line 113 is formed of a curved line or a curved line and a straight line. As such, the first line 113 of the present embodiment includes at least a curved line. Here, in the first line 113, the curve occupies more than half. In fig. 6, the first line 113 is a straight line near the first end point, and the rest is a curved line. In addition, the center portion of the first line 113 is a curved line.

The second line 114 is composed of a straight line, or a curved line and a straight line. In this way, the second line 114 of the present embodiment includes at least a straight line. Here, the straight line of the second line 114 is located at the center portion. In addition, in the second line 114, the straight line occupies half or more. In fig. 6, the second line 114 is curved near the radially inner end edge 115, and the rest is straight.

The straight line of the second line 114 is longer than the straight line of the first line 113. Since the coil 10 is not in contact with the side surface of the blade 110 including the second wire 114, the influence on the reduction of the load generated in the coil 10 is small even if the second wire 114 includes many straight lines. The side surface including a straight line is easier to manufacture than the side surface including a curved line when viewed in the axial direction. Therefore, the side surface including the second line 114 can be easily manufactured, and thus the manufacturing of the blade 110 becomes easy.

The straight line constituting the second line 114 includes the second end point 112. That is, the second line 114 includes a straight line extending from the second end point 112 toward the radially inner side. This makes the manufacture of the blade easier.

As shown in fig. 7, a pair of blades 110 arranged at intervals in the circumferential direction includes a first end point 111, a second end point 112, a first line 113, and a second line 114 as viewed in the axial direction. The first lines 113 of the pair of blades 110 are located circumferentially outward of each other as viewed axially. In addition, the second lines 114 of the pair of blades 110 are located circumferentially inward of each other as viewed in the axial direction. When the annular coil 10 is inserted into the two slots 21, the side surface of one of the vanes 110 including the first wire 113 is arranged to contact one coil side of the coil 10, and the side surface of the other of the vanes 110 including the first wire 113 is arranged to contact the other coil side of the coil 10, whereby the contact area with the coil side can be increased. Therefore, the present invention is applied to the coil insertion device 100 for inserting the loop coil 10 into the slot 21.

In fig. 7, the first coil 11 and the second coil 12 are not shown in a state of being pressed by the peeling device 120. Therefore, fig. 7 schematically shows the positional relationship between the first coil 11 and the second coil 12 and the blade 110. The pair of blades 110 shown in fig. 7 holds the first coil 11. Another pair of blades (not shown) holds the second coil 12.

< peeling means >

The peeling device 120 as a coil moving mechanism is disposed radially inward of the stator core 20. The stripping unit 120 moves relative to the stator core 20 in the axial direction, and moves the coil 10 relative to one side in the axial direction. The stripping means 120 and the blade 110 allow the coil 10 to be easily inserted into the slot 21.

By the stripping means 120, the coil 10 is moved in the axial direction inside the stator core 20 in the radial direction, and a part of the coil 10 is inserted into the inside of the slot 21 from the slot opening 22. Specifically, the peeling apparatus 120 hooks the radially inner side of the coil 10, and lifts the coil 10 along the blade 110.

The peeling device 120 is moved in the axial direction by a peeling device driving unit (not shown). In detail, the peeling means 120 is movable to the other side in the axial direction and movable to the one side in the axial direction. The peeling device driving unit includes a member that is attached to the peeling device 120 and is pushed in the axial direction, and a driving source that moves the member in the axial direction.

The stripping means 120 has a shape that can be disposed in the slot opening 22. Specifically, as shown in fig. 3, the peeling means 120 includes a shaft 121 and a large diameter portion 122. The shaft 121 extends in the axial direction. The large diameter portion 122 is provided at the other axial end of the shaft 121. The radially inner side of the annular coil 10 is hooked to the large diameter portion 122. The large diameter portion 122 has a diameter larger than that of the shaft 121. The central axes of the shaft 121 and the large diameter portion 122 are the same. The diameter of the large diameter portion 122 is the distance between the blades 110.

As shown in fig. 8, the large diameter portion 122 of the peeling apparatus 120 has a shape along the blade 110.

Specifically, the peeling apparatus 120 has a side face 123 along the first line 113 (refer to fig. 6 and 7) of the blade 110 as viewed in the axial direction. Thereby, the coil 10 can be more easily inserted into the slot 21 by the peeling means 120 and the blade 110. Here, the side surface 123 is formed of a curved surface, or a curved surface and a flat surface.

The peeling apparatus 120 has a side surface 124 that extends along the second line 114 (see fig. 6 and 7) of the blade 110 when viewed in the axial direction. Here, the side surface 124 is constituted by a flat surface, or a flat surface and a curved surface. Thus, the peeling means 120 has a side surface 124 along a straight line constituting the second line 114 of the blade 110 as viewed in the axial direction. Accordingly, since the side surface 124 includes a straight line when viewed in the axial direction, the peeling device 120 can be easily manufactured in addition to the blade 110.

The radially outer edge of the stripping device 120 of the present embodiment is located radially inward of the radially inner edge of the stator core 20, but may be located radially outward of the radially inner edge of the stator core 20.

(coil inserting method)

Next, a coil insertion method according to the present embodiment will be described with reference to fig. 1 to 9. The coil insertion method of the present embodiment is a method of inserting the coil 10 using the coil insertion device 100 described above.

First, as shown in fig. 9, the coil 10 is formed (step S1). The step S1 includes a step of forming the first coil 11 by winding the coil wire around the first bobbin and a step of forming the second coil 12 by winding the coil wire around the second bobbin. Thereby, as shown in fig. 2, the coil 10 including the first coil 11 and the second coil 12 including the first coil 11 can be formed.

Further, the coil insertion device 100 is provided to the stator core 20 (step S2). In step S2, as shown in fig. 3, the coil 10 and the coil insertion device 100 are disposed on one axial side of the stator core 20. In detail, the coil 10 is configured to be held between the plurality of blades 110. Further, the peeling device 120 is disposed at the center in the radial direction and at one axial side of the plurality of blades 110.

Next, as shown in fig. 4, the blade 110 and the peeling means 120 are moved from one axial side to the other axial side (step S3). In step S3, the peeling means 120 moves to the other axial side together with the blade 110. In this movement, the vanes 110 are located radially inward of the stator core 20. Since the inner side of the coil 10 moves in a state of being hooked by the peeling means 120, the coil 10 moves to the other side in the axial direction.

By moving the blades 110 and the peeling means 120 in this manner, as shown in fig. 5, the coil 10 can be inserted into the slot 21 of the stator core 20 (step S4). In step S3, a step of moving at least one of the blade 110 and the peeling device 120 from the other side to the one side from the axial direction may be performed in accordance with the insertion resistance of the coil 10 or the like.

Next, the coil inserting device 100 is detached from the stator core 20 (step S5). Specifically, the vanes 110 are detached from the stator core 20. Further, the peeling device 120 is moved downward.

By performing the above steps (steps S1 to S5), the coil 10 can be inserted into the plurality of slots 21 penetrating in the axial direction of the stator core 20. As a result, the stator 1 shown in fig. 1 can be manufactured.

(Effect)

The operational effects of the coil inserting apparatus 100 according to the present embodiment will be described in comparison with the coil inserting apparatus including the blade of the comparative example shown in fig. 10. In addition, arrows A1, A2 in fig. 10 show tension applied when the coil 10 is inserted into the slot 21 by the coil insertion device. In fig. 6, the same tension is applied, but illustration thereof is omitted.

The blade of the comparative example shown in fig. 10 is line-symmetric with respect to a straight line L when viewed in the axial direction. Therefore, in the blade 210 of the comparative example, the radially inner end edge 215 is located on the straight line L.

In the blade 210 of the comparative example, in the region R1 in the vicinity of the radially inner end edge 215 in the region including the first end point 111 of the two regions divided by the straight line L, the surface pressure generated by the tension applied to the coil 10 when the coil 10 is inserted is concentrated. Therefore, if the blade 210 of the comparative example is used, the coil 10 is highly likely to be damaged.

On the other hand, the blade 110 of the present embodiment applies tension to the coil 10 at the time of insertion of the coil 10 in the region R2 near the radially inner end edge 215, of the two regions divided by the straight line L, the region including the first end point 111 and the region including the second end point 112. However, in the blade 110 of the present embodiment, since the area in contact with the coil 10 is larger than that of the comparative example, the surface pressure can be dispersed. Therefore, the coil insertion device 100 of the present embodiment can reduce the possibility of damage occurring to the coil 10.

In the present embodiment, the length of the straight line of the second line 114 is longer than the length of the straight line of the first line 113. Since the coil 10 is not in contact with the side surface including the second wire 114, the influence on the reduction of the load generated on the coil 10 is small even if the second wire includes many straight lines. Since the side surface including the straight line can be processed into a flat surface when viewed in the axial direction, the side surface can be easily manufactured as compared with a side surface including a curved line. Therefore, by making the second line 114 include many straight lines, the side surface including the second line 114 can be easily manufactured. Therefore, the processing cost can be reduced. Moreover, the rigidity of the blade 110 can be improved.

(modification example)

In the above embodiment, as shown in fig. 2, the method of simultaneously inserting two coils 10, i.e., the first coil 11 and the second coil 12, into the four slots 21 has been described as an example, but the present invention is not limited thereto. One annular coil 10 may be inserted into two slots 21, or three or more annular coils 10 may be simultaneously inserted into six or more slots 21.

The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the claims, not by the embodiments described above, and includes meanings equivalent to the claims and all modifications within the scope.

Description of the symbols

1: stator with a stator core

10: coil

20: stator core

21: trough

100: coil insertion device

110: blade

111: first end point

112: second end point

113: first wire

114: second wire

115: radially inward end edge

120: stripping device

123. 124: a side surface.

Claims (8)

1. A coil inserting device inserts coils into a plurality of slots penetrating in an axial direction of a stator core by relatively moving the coils from one side to the other side in the axial direction,

a plurality of blades arranged in a circumferential direction of the stator core on a radially inner side of the stator core, extending in an axial direction, and holding the coil,

at least one of the blades comprises, when viewed axially:

a first end point located on one side in the circumferential direction in the radially outer end edge;

a second end point located on the other circumferential side in the radially outer end edge;

a first wire extending radially inward from the first end point; and

a second line extending radially inward from the second end point and including a radially inward end edge of the vane,

the radially inner end edge is located in a region including the second end point out of two regions divided by a straight line extending in the radial direction through a midpoint between the first end point and the second end point.

2. The coil insertion device according to claim 1,

the radially inner end edge is an intersection of the first line and the second line.

3. The coil insertion device according to claim 1 or 2,

the stator core is provided with a coil moving mechanism which is disposed radially inward of the stator core, moves relative to the stator core in an axial direction, and moves the coil relative to the stator core from one side to the other side in the axial direction.

4. The coil insertion device according to claim 3,

the coil moving mechanism has a side surface along the first line when viewed in an axial direction.

5. The coil insertion device according to any one of claims 1 to 4,

the first line is constituted by a curved line or by a curved line and a straight line,

the second line is constituted by a straight line or by a curved line and a straight line,

the straight line of the second line is longer than the straight line of the first line.

6. The coil insertion device according to claim 5,

the stator further includes a coil moving mechanism that is disposed radially inward of the stator core, moves relative to the stator core in an axial direction, and moves the coil relative to the stator core from one side in the axial direction to the other side,

the coil moving mechanism has a side surface along a straight line constituting the second line when viewed in the axial direction.

7. The coil insertion device according to claim 5 or 6,

the second end point is included in a straight line constituting the second line.

8. The coil insertion device according to any one of claims 1 to 7,

a pair of the blades arranged at intervals in the circumferential direction includes the first end point, the second end point, the first line, and the second line when viewed in the axial direction,

the first lines of a pair of the blades are located circumferentially outside of each other as viewed axially.

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