JP7063785B2 - Segment coil fixing method - Google Patents

Description

The present invention relates to a segment fixing method in fold-down molding of a segment coil.

Patent Document 1 describes a coil twisting device for inversion molding of a segment coil. This coil twisting device bends the end of the lead portion protruding from the end face of the starter core with the two lead portions of the segment coil, which is a U-shaped conducting wire, inserted into the slot of the stator core. At this time, by arranging the flat plate-shaped coil holding member in contact with the bent portion of the U-shaped segment coil, the segment coil is restricted from moving in the axial direction with respect to the stator core.

Japanese Unexamined Patent Publication No. 2008-79443

In the above coil twisting device, a flat plate-shaped coil holding member is brought into contact with the bent portion of the U-shaped segment coil to limit the axial movement of the segment coil, but the end portion of the lead portion is used as the stator core. When the pressing force when pushing and bending toward the direction becomes large, the bent portion of the segment coil may not be able to withstand the axial pressing load applied to the lead portion and may buckle and deform. In this case, adjacent segments may come into contact with each other and the insulating film formed on the surface may be damaged.

The present invention provides a segment coil fixing method capable of effectively suppressing deformation of a bent portion of the segment coil.

The present invention is a method for fixing a segment coil at the time of coil tilting molding, in which a U-shaped segment coil is inserted into a stator to project the lead side, and when the lead side is tilted and molded, the anti-lead of the segment coil is formed. A jig that supports the skewed portion on the side from the outside in the axial direction is inserted from the inner diameter side and the outer diameter side in the radial direction of the stator to fix the segment coil.

The jig includes an inner diameter side member and an outer diameter side member, and the inner diameter side member moves to the outer diameter side and the outer diameter side member moves to the inner diameter side, so that the diagonal portion on the anti-lead side of the segment coil It is good to support.

An inner diameter side cam hole and an outer diameter side cam hole are formed in the cam ring, and the cam followers of the inner diameter side member and the outer diameter side member are inserted into the inner diameter side cam hole and the outer diameter side cam hole, respectively, to insert the cam ring. By rotating the member, the inner diameter side member and the outer diameter side member may move in the outer diameter direction and the inner diameter direction, respectively.

Further, the present invention is a fixing jig for fixing the segment coil at the time of tilting and molding the stator coil. A U-shaped segment coil is inserted into the stator to project the lead side, and the lead side is tilted and molded. At this time, the segment coil is fixed by inserting the outer diameter side member and the inner diameter side member from the inner diameter side and the outer diameter side of the stator and supporting the oblique portion on the opposite lead side of the segment coil from the outside in the axial direction. May be.

According to the present invention, by supporting the oblique portion on the opposite lead side of the segment coil from the outside in the axial direction, it is possible to effectively prevent buckling deformation of the segment coil during tilting and molding of the stator coil.

It is a figure which shows the stator core 10 and the segment coil 12. It is a figure which shows the state which the segment coil 12 is attached to the stator core. It is a figure which shows the coil end 38 on the lead side. It is a figure which shows the state which welded the segment coil 12 and formed the stator coil 24. It is a figure which shows typically the state which the oblique part 22a of a segment coil 12 is fixed. It is a figure which shows the whole structure (the figure seen from diagonally below) of a jig 50. It is the figure which looked at the cam ring 58 from diagonally above. It is a figure which shows the cross section in the radial direction through a pair of outer diameter side members 54 and inner diameter side members 56. It is a perspective view of one outer diameter side member 54, and (a) and (b) are views which changed the viewing angle. It is a perspective view of one inner diameter side member 56, and (a) and (b) are views which changed the viewing angle. It is a figure which shows the state which the segment coil is inserted into the stator core 10 and the coil end 38 on the lead side is formed. 11 is a perspective view of FIG. 11 looking outward around the AA plane. 11 is a perspective view of the inside of FIG. 11 around the AA plane. In the same figure as FIG. 12, it is a figure which shows the state which a large number of 1st coil end portions 32 are arranged between the outer diameter side member 54 and the inner diameter side member 56.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described here.

"Formation of stator coil"
First, the formation of a stator coil using a U-shaped segment coil will be briefly described. FIG. 1 is a diagram showing a stator core 10 of a rotary electric machine and a segment coil 12 constituting a coil. The stator core 10 has a substantially cylindrical shape, and has a substantially cylindrical yoke 14 and teeth 16 extending radially inward from the yoke 14.

The teeth 16 are arranged in the circumferential direction at intervals, and the space between the adjacent teeth 16 is a slot 18. The segment coil 12 is composed of a conducting wire (flat conducting wire) having a rectangular cross section and having an insulating film such as enamel formed on the surface thereof. The segment coil 12 is formed by bending a conducting wire into a substantially U shape. The portion corresponding to the left and right straight portions of the U-shape is referred to as an arm portion 20, and the portion corresponding to the bottom portion connecting the straight portions is referred to as a bottom portion 22. The segment coil 12 is inserted into the slot 18 and mounted on the stator core 10, and the tip of the arm portion 20 is projected from the end surface (upper end surface in FIG. 1) of the stator core 10. The protruding side is called the lead side, and the bottom 22 side is called the anti-lead part.

FIG. 2 shows a state in which the segment coil 12 is mounted on the stator core. From this state, the portion of the arm portion 20 protruding from the end surface of the stator core 10 is bent in the circumferential direction (tilt molding). Here, at the time of this coil tilting molding, the tip of the segment coil is deformed by pressing it in the axial direction and pushing it in.

FIG. 3 shows a state in which the arm portion 20 of the segment coil 12 is bent to form the coil end 38 (see FIG. 4) on the lead side. By welding the tips of two arms 20 adjacent to each other in the radial direction (for example, the tips 120 and 120 of the arms shown in FIG. 3), a plurality of segment coils 12 are connected to form a stator coil 24. The segment coil 12 is covered with an insulating film 122 such as enamel, and the insulating film 122 is peeled off and removed at the tip portion 120.

FIG. 4 shows a state in which the segment coil 12 is welded to form the stator coil 24. The segment coil 12 has a slot inner portion 26 arranged in the slot and coil end portions 32, 34 connecting the slot inner portions outside the axial end faces 28, 30 of the stator core. In FIG. 4, on the lower side of the first end surface 28, the bottom portion 22 of the segment coil 12 becomes the first coil end portion 32 on the lead side to form the first coil end 36. On the side of the upper second end surface 30, the second coil end portion 34, which is a portion protruding from the slot 18 of the arm portion 20 of the segment coil 12, is welded to the tips of the second coil end portions 34 on the opposite side. It constitutes the coil end 38.

"Fixing on the non-lead side"
<Basic configuration>
As described above, the segment coil 12 is pressed in the axial direction during the inversion molding of the lead side portion of the segment coil 12. Therefore, it is necessary to support the segment coil 12 so as not to move at the first coil end 36 on the non-lead side.

In the present embodiment, a jig that supports the hypotenuse portion of the segment coil 12 from the outside in the axial direction is prepared, whereby the segment coil 12 is fixed at the time of tilting molding.

FIG. 5 is a diagram schematically showing a state in which the oblique portion 22a of the segment coil 12 is fixed. In this way, the diagonally inclined portion 22a at the bottom portion 22 of the segment coil 12 on the opposite lead side is suppressed by the jig 40 from the outside in the axial direction. This makes it possible to fix and support the segment coil 12 while suppressing the buckling deformation of the segment coil 12 during the tilting molding while pressing the segment coil 12 in the axial direction.

<Structure of jig>
FIG. 6 shows the overall configuration (viewed from diagonally below) of the jig 50 according to the present embodiment. The annular portion 52 has a shape corresponding to the stator core, and accommodates and fixes the coil end on the opposite lead side.

At the lower part of the annular portion 52, a large number of outer diameter side members 54 are arranged in a circle at the peripheral portion. Further, the inner diameter side members 56 are arranged in a circle so as to face the outer diameter side member 54 from the inside. A predetermined annular space is formed between the outer diameter side member 54 and the inner diameter side member 56, and the anti-lead side coil end is accommodated therein. Further, a restricting member 55 extending in the radial direction is arranged between the outer diameter side member 54 and the inner diameter side member 56 in the circumferential direction. As a result, the movement of the outer diameter side member 54 and the inner diameter side member 56 in the circumferential direction is restricted, and these move only in the radial direction.

A cam ring 58 is provided at the lower part of the annulus portion 52, and the gear 62 of the servomotor 60 is meshed with the cam ring 58. Therefore, by driving the servomotor 60, the cam ring 58 rotates.

FIG. 7 shows a view of the cam ring 58 as viewed from diagonally above. As described above, the cam ring 58 is provided with a large number of guide holes 64 in two concentric circles. The pair of guide holes 64 facing each other in the radial direction are separated from each other on one side in the circumferential direction and close to each other on the other side. That is, the inner guide hole 64 is located on the inner side on one side and the outer side on the other side, and the outer guide hole 64 is located on the outer side on one side and the inner side on the other side. Therefore, when the cam ring is rotated in one direction with the cam follower inserted in the guide hole 64, the pair of cam followers move away in the radial direction, and when the cam follower is rotated in the other direction, the pair of cam followers move in the radial direction. do.

FIG. 8 shows a radial cross section passing through the pair of outer diameter side members 54 and inner diameter side members 56. As described above, the outer diameter side member 54 and the inner diameter side member 56 have a cam follower 66 facing upward at the upper end thereof, and this is inserted into the guide hole 64 of the cam ring 58.

Therefore, with the cam follower 66 open, the coil end on the non-lead side is inserted between the outer diameter side member 54 and the inner diameter side member 56, and the cam ring is rotated to move to a position where the cam follower 66 approaches. The outer diameter side member 54 and the inner diameter side member 56 move in a direction in which the gap between them narrows, and are inserted into the inside of the coil end.

9 is a perspective view of one outer diameter side member 54, and FIGS. 9A and 9B are views in which the viewing angle is changed. As described above, the outer diameter side member 54 has a plate-shaped main body 54a located on the outside and a convex portion 54b protruding inward from the main body 54a. The convex portion 54b is provided with a pair of oblique support portions 72, 74 that support the oblique portion 22a of the coil end from the outside in the axial direction. The skew support portion 72 supports the skew portion 22a of the coil end on the right side in the inward movement direction, and the skew support portion 74 supports the coil end on the left side in the movement direction.

10A and 10B are perspective views of one inner diameter side member 56, and FIGS. 10A and 10B are views in which viewing angles are changed. As described above, the inner diameter side member 56 has a plate-shaped main body 56a located inside and a convex portion 56b protruding inward from the main body 56a. The convex portion 56b is provided with a pair of oblique support portions 76, 78 that support the oblique portion 22a of the coil end from the inside in the axial direction. The skew support portion 76 supports the skew portion 22a of the coil end on the right side in the outward movement direction, and the skew support portion 78 supports the coil end on the left side in the movement direction.

FIG. 11 shows a state in which the segment coil is inserted into the stator core 10 and the coil end 38 on the lead side is formed.

FIG. 12 shows a perspective view looking outward around the plane passing through the axis center shown by AA in FIG. 11. In this way, the convex portion 54b of the outer diameter side member 54 is inserted between the first coil end portions 32 of the segment coil, and the skew support portions 72 and 74 are above the skew portion 22a of the first coil end portion 32. Support from.

FIG. 13 shows a perspective view of the inside of FIG. 11 around the AA plane. In this way, the convex portion 56b of the inner diameter side member 56 is inserted between the first coil end portions 32 of the segment coil, and the oblique support portions 76 and 78 form the oblique portion 22a of the first coil end portion 32 from above. To support.

FIG. 14 shows a state in which a large number of first coil end portions 32 are arranged between the outer diameter side member 54 and the inner diameter side member 56 in the same view as in FIG. In this way, a large number of first coil end portions 32 are arranged in the radial direction, and as shown in this figure, the diagonal portions 22a of the first coil end portions 32 on the outer diameter side and the inner diameter side are formed on the outer diameter side member 54. And it is supported by the inner diameter side member 56. The first coil end portion 32 located in the middle is supported from the outside in the axial direction by the regulating member 55, but the outer diameter side member 54 and the inner diameter side member 56 support the first coil end portion 32 on the outer diameter side and the inner diameter side. By bringing the outer diameter side member 54 and the inner diameter side member 56 closer to each other while supporting the oblique portion 22a, all the first coil end portions 32 arranged in the radial direction can be sandwiched, whereby the coil end 38 of the coil end 38 can be sandwiched. It is possible to effectively prevent the segment coil from buckling and deforming during inversion molding.

10 Servo Core, 12 Segment Coil, 14 Yoke, 16 Teeth, 18 Slots, 20 Arms, 22 Bottom, 22a Oblique, 24 Stator Coil, 26 Slot Inner, 28,30 End Face, 32,34 Coil End, 36 , 38 coil end, 40,50 jig, 52 ring part, 54 outer diameter side member, 54a, 56a main body, 54b, 56b convex part, 55 regulation member, 56 inner diameter side member, 58 cam ring, 60 servo motor, 62 gear , 64 guide holes, 66 cam followers, 72,74,76,78 skewed supports, 120 tips, 122 insulating coatings.

Claims (1)

It is a method of fixing the segment coil at the time of coil tilting molding.
When inserting a U-shaped segment coil into the stator to project the lead side and tilting the lead side for molding
A jig that supports the slanted portion on the opposite lead side of the segment coil from the outside in the axial direction is inserted from the inner diameter side and the outer diameter side in the radial direction of the stator to fix the segment coil.
Segment coil fixing method.

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