JPH088762B2 - Coil shaping jig - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coil shaping jig for inserting a stator core into a stator core and pushing the coil end outward when shaping the coil end inserted into the stator core. .

“Prior Art and its Problems” Conventionally, in a rotating electric machine such as a motor, one in which a coil is inserted in a stator core is widely used.
The coil can be inserted by winding a wire around a winding frame having a plurality of winding steps to form a coil, a plurality of blades arranged in an annular shape, and axially movable inside these blades. Made by a coil insertion device with a stripper. That is, a coil is formed on each winding stage of a winding frame by a winding device, the coil is dropped into a predetermined portion of a blade of a coil inserting device, and the coil is inserted into a groove of a stator core by a stripper.

The coil thus inserted into the stator core has loop-shaped ends protruding from both end surfaces of the stator core. Then, when the stator core is housed in the main body of the rotary electric machine, the coil ends are required to be shaped into a shape as compact as possible. Therefore, after inserting the coil into the stator core, a step of shaping the coil end is performed.

Conventionally, this coil shaping has been performed by the steps shown in FIGS. 5 to 7. That is, as shown in FIG. 5, after the coil 2 is inserted into the stator core 1, the first rod shaping jig 3 having a round bar shape is inserted into the inside of the stator core 1. The first coil shaping jig 3 has a tip portion.
The coil 3a is tapered so as not to be caught by the coil 2. When the first coil shaping jig 3 is inserted inside the stator core 1, the coil 1 is spread outward. Next, as shown in FIG. 6, the coil 2 is compressed by the second shaping jig 6 including the upper shaping die 4 and the lower shaping die 5 to be shaped into a compact shape. The upper shaping mold 4 includes a pressing surface 4a having a gently curved surface that compresses and shapes the coil end portion 2a protruding from the upper end surface of the stator core 1, a shaft portion 4b inserted into the stator core 1, and a shaft portion 4b. It has a taper portion 4c formed at the tip. On the other hand, the downward shaping type 5
The stator core 1 is provided with a pressing surface 5a having a gentle curved surface for compressing and shaping the coil end portion 2b protruding from the lower end surface, and a shaft hole 5b for receiving the shaft portion 4b. And
The upper shaping mold 4 and the lower shaping mold 5 are brought close to each other to sandwich both end faces of the stator core 1 so that the respective coil end portions 2a and 2b are compressed and shaped into a compact shape.

By the way, in recent years, as a coil insertion device, a new method called a so-called papeci method as shown in, for example, JP-A-56-115161 is being adopted. This coil insertion device will be described with reference to FIGS.
This coil insertion device 11 has a plurality of movable blades 13 arranged in an annular shape corresponding to the inner teeth of the stator core 12,
These movable blades 13 have their bases fixed to a blade holder 14. The movable blade 13 and the blade holder 14 are configured to move in the axial direction by a rod 15. A movable casing is located above the movable blade 13.
16 are arranged, and wedge guides 17 are attached to the movable casing 16 in an annular arrangement. The wedge guide 17 slides on the outer periphery of the movable blade 13. An alignment 18 is inserted into the wedge guide 17, and the alignment 18 is moved in the axial direction by a rod 19.

Then, explaining the operation of this coil insertion device 11,
In the state shown in FIG. 8, the coil 20 wound around a predetermined portion of the movable blade 13 is hooked. In this case, the blade holder 14 is inserted into the stator core 12 and the movable blade 13
Project from the upper end surface of the stator core 12. As shown in FIG. 9, the movable casing 16 descends together with the alignment 18, the alignment 18 is inserted from the tip of the movable blade 13, and the wedge guide 17 slides on the outer periphery of the movable blade 13. As shown in FIG. 10, the movable casing
16 further descends and stops when the lower end of the wedge guide 17 reaches the upper end surface of the stator core 12. As shown in FIG. 11, the rod 19 moves the alignment 18 downward,
Along with that, the blade holder 14 is also moved downward by the rod 15, and the coil 20 is aligned with the alignment holder 18 and the blade holder.
It is inserted into the slot of the stator core 2 while being sandwiched by the 14 while being guided by the movable blade 13. At this time,
A wedge (not shown) is inserted into the groove of the stator core 12 together through the wedge guide 17. As shown in FIG. 12, when the alignment 18 reaches the lower end surface of the stator core 12, the coil 20 projects from the lower end surface of the stator core 12 and is completely inserted. In this state, as shown in FIG. 13, the blade holder 14 is further lowered, and the movable blade 13 is pulled out from the coil 20. Further, as shown in FIG. 14, the alignment 18 moves upward and is pulled out from the inside of the stator core 12. Then, as shown in FIG. 15, the movable casing 16 rises and returns to its original position, and the insertion of the coil 20 is completed.

In the coil inserting device 11, when the coil 20 is inserted, the movable blade 13 moves together with the alignment 18 so as to draw the coil 20 into the slot of the stator core 12, so that the friction between the coil 20 and the movable blade 13 is reduced. There is little force and therefore the coil during insertion
There is an advantage that problems such as damage of 20 and lock of the alignment 18 are eliminated, and moreover, the electric wire can be inserted more closely into the groove of the stator core 12.

However, when using the above-mentioned Papeche type coil insertion device, the state of the coil end portion inserted in the stator core is different between the upper side and the lower side. That is, as shown in FIG. 5, the upper coil end portion 2a is different in the projecting amount stepwise among the coils formed corresponding to each winding stage of the winding frame, but the lower coil end portion 2a is different. The protrusion amount of the portion 2b is relatively uniform among the coils formed corresponding to each winding stage of the winding frame. In other words, at the upper coil end 2a, the inner coil with the large loop (the third stage coil in the winding frame and the fourth stage coil) protrudes longer, and the outer coil with the smaller loop (the first stage in the winding frame). Although the second-stage coil) protrudes shortly, the lower coil end portion 2b is in a state where there is not much difference in the amount of projection. Therefore, when shaped by the second coil shaping jig 6, at the lower coil end 2b, the outer coil (first and second stage coils in the winding frame) becomes a wall and the inner coil ( It is difficult to shape the coil into a compact shape in which the coil is bent outward because the third coil and the fourth coil of the winding frame are not bent sufficiently and the entire coil is in a standing state. Also, if you try to compress it strongly and shape it,
Inner coil (3rd and 4th coil in reel)
However, there is also a problem that the coil is easily damaged because it crosses at the root of the outer coil (first and second stage coils in the winding frame).

"Object of the Invention" An object of the present invention is to provide a coil shaping jig for improving the shaping of the lower coil end portion when the above-mentioned Papeche type coil insertion device is adopted. is there.

"Structure of the Invention" The present invention relates to a coil shaping jig for inserting the stator core and pushing the coil end outward when shaping the coil end inserted into the stator core. It consists of a round rod-shaped body that is inserted in contact with the inner circumference of the stator core, and the tip part has a tapered shape, and it projects annularly in the middle of this tapered part, and has a plane portion perpendicular to the axis of the rod-shaped body. It is characterized in that a step portion having is formed.

The coil shaping jig of the present invention is equivalent to the first coil shaping jig 3 shown in FIG. 5 in the above-mentioned conventional coil shaping jig.
It is for inserting into the stator core and pushing the coil outward.

When the coil shaping jig according to the present invention is inserted into the stator core from above, the stepped portion formed in the tapered portion is caught by the inner coil having a large loop (for example, the third and fourth step coils in the winding frame), The coils can be pulled out downward to increase the amount of protrusion. Therefore, when applied to a stator core into which a coil is inserted by a coil insertion device using the Papeche method, the coil inside the coil end projecting from the lower end surface of the stator core is pulled out to a longer length downward, and the coil end projecting from the upper end surface of the stator core is The state and the state of the coil ends projecting from the lower end surface are made substantially the same, and the upper and lower coil ends can be shaped well when the shaping is performed by the second shaping jig.

"Embodiment of the Invention" FIGS. 1 to 4 sequentially show a shaping process using a coil shaping jig embodying the present invention. 2 to 4, the coil cross sectional shape is omitted.

When the coil is inserted into the stator core using the Papeche type coil insertion device, the state shown in FIG. 1 is obtained. That is, the coil end portion 2a protruding from the upper end surface of the stator core 1 includes an outer coil having a smaller loop (first coil in the winding frame and a second coil in the winding frame) to an inner coil having a larger loop (third coil in the winding frame). The protrusion amount becomes longer as it becomes the first coil and the coil of the fourth stage, and the difference in the protrusion amount is considerably large. On the other hand, the coil end portion 2b projecting from the lower end surface of the stator core 1 includes an outer coil having a small loop (first coil in the winding frame and a second coil in the winding frame) to an inner coil having a large loop (third coil in the winding frame). Although the protrusion amount becomes longer toward the first and fourth coils), the difference in the protrusion amount is small, and the lengths are considerably close to each other as a whole. Further, the coil end portion 2b protruding from the lower end surface of the stator core 1 is in a state of entering the inside of the stator core 1.

The coil shaping jig 21 embodying the present invention pushes the coil 2 outward by inserting it into the stator core 1 from above as a pre-stage of coil shaping.
The coil shaping jig 21 as a whole has a round bar shape that is inserted in contact with the inner circumference of the stator core 1, and has a tapered portion 22 at the tip thereof, and an annular shape is formed in the middle of the tapered portion 22. It is formed by forming a stepped portion 23 having a flat surface portion 23a protruding and perpendicular to the axis of the round bar.

When this coil shaping jig 21 is inserted into the inside of the stator core 1 from above, as shown in FIG. 2, the step portion 23 of the taper portion 22 causes the inner coil 2 at the lower coil end portion 2b to move.
(4), 2 (3) (4th and 3rd stage coils in the reel).

When the coil shaping jig 21 is pushed further downward in this state, the inner coils 2 (4) and 2 (3) at the lower coil end 2b are hooked on the step 23 as shown in FIG. It is pulled down by an appropriate length.

Then, when the coil shaping jig 21 is pushed further downward,
Coil end 2a above the inner coil 2 (4), 2 (3)
Becomes shorter and gives a resistance force to the downward drawing, so that the lower coil ends 2b of the inner coils 2 (4) and 2 (3) gradually move along the annular corner of the stepped portion 23. As a result of slippage, as shown in FIG. 4, the inner coils 2 (4) and 2 (3) at the lower coil end 2b are also removed from the step 23, and the jig 21 having a diameter substantially equal to the inner diameter of the stator core 1 is removed. Spread outwards by the base.

As a result, at the lower coil end 2b, the protruding length of the inner coils 2 (4), 2 (3) becomes longer, and the outer coils 2 (1), 2 (2) (winding) having a small loop are wound. The protrusion amount becomes longer from the first coil and the second coil in the frame) to the inner coils 2 (3) and 2 (4) having the larger loops (the third coil and the fourth coil in the winding frame). The state is formed. Also, at the upper coil end 2a, the inner coils 2 (3), 2 (4) are slightly shorter, but they are originally too long, so that the shaping becomes worse even if the length is somewhat shortened. There is no. In this way, the state of the upper coil end 2a and the state of the lower coil end 2b are substantially balanced.

In this state, by using the second conventional coil shaping jig 6 shown in FIG. 6 and compressing the coil end portions 2a and 2b,
Coil shaping is done. In this case, the inner coil 2 (4), 2
Since (3) projects considerably longer than the outer coils 2 (1), 2 (2), the inner coils 2 (4), 2 (3)
Is easily bent outward, and a good shaping state is formed. Moreover, since the inner coils 2 (4) and 2 (3) do not bend from the roots and cross the outer coils 2 (1) and 2 (2), damage to the electric wires is prevented.

In addition, in the above-described embodiment, the step portion 23 has the inner side coil
(4) It is designed to be hooked on 2 (3), but the step
Depending on the height of 23, only the innermost coil 2 (4) may be hooked.

[Advantages of the Invention] As described above, according to the present invention, the tip portion is tapered, and the stepped portion having the plane portion that projects annularly in the middle of the tapered portion and is perpendicular to the axis is provided. Therefore, when it is inserted from above the stator core, the step portion is caught by the inner coil at the lower coil end portion, and the lower end protrusion length of the inner coil can be increased. The inner coil can be easily bent outward to improve the shaping property. Further, since the inner coil at the lower coil end portion does not bend from the root and crosses the outer coil, damage to the coil is also prevented.

[Brief description of drawings]

1, FIG. 2, FIG. 3, and FIG. 4 are schematic screen diagrams sequentially showing the state of performing coil shaping using the coil shaping jig embodying the present invention, FIG. 5, FIG. 6, and FIG. The drawings are schematic side views sequentially showing a state of performing coil shaping using a conventional coil shaping jig, FIG. 8, FIG. 9, FIG. 10, FIG.
FIG. 12, FIG. 13, FIG. 14 and FIG. 15 are schematic vertical cross-sectional views sequentially showing a state in which a coil is inserted using the Papeche type coil insertion device. In the figure, 1 is a stator core, 2 is a coil, 2a is an upper coil end, 2b is a lower coil end, 21 is a coil insertion jig,
Reference numeral 22 is a taper portion, and 23 is a step portion.

Claims (1)

[Claims] 1. A coil shaping jig for inserting the stator core into the stator core and expanding the coil end outwardly when shaping the coil end inserted into the stator core. Is formed by a round rod-shaped body inserted into contact with, and the tip portion has a tapered shape, and a step portion protruding annularly in the middle of the tapered portion and having a plane portion perpendicular to the axis of the rod-shaped body is formed. A coil shaping jig characterized by being formed.