JPS5967856A - Method and device for forming stator coil - Google Patents

Abstract

PURPOSE:To simplify the expanding mechanism of a coil shaping unit by forming a coil end by a shaping blade, and then expanding the coil end oopositely to lead wirings side while pressing the coil end at the lead wiring side to a shaping die. CONSTITUTION:A core retainer 9 is stopped at the preparing position, a stator core 10 is placed and held and the oil end 11a of the lead wiring side is opposed to a coil shaping jig 18. Then, both coil ends 11a, 11b of a stator core 10 are covered on a shaping blade 14, and are expanded in an outer circumferential direction. The coil end 11a of the lead wirings side is pressed to a coil end shaping recess 21 of a shaping die 15 to form it in the prescribed shape. An expansion piece 3 expands the coil end 11b oppositely to the lead wiring side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator iron core of a rotating electric machine, in which a coil is housed in a groove Q, and both ends of the iron core (the protruding coil ends) are formed into a predetermined shape by a coil forming device equipped with a forming blade and an expansion piece. The present invention relates to a method and apparatus for forming a stator coil having a dimension Q.

[Technical background and problems of the invention]

The coil ends of the stator core of a rotating electrical machine are stored in the coils, and the coil ends that protrude from both ends of the core are formed into a predetermined shape and size. There is a method in which both ends are simultaneously formed using an expansion piece, and a method in which a forming blade is inserted into a slot in the stator core in which no coil is inserted to expand both coil ends.

First, a first conventional example will be explained with reference to FIG. 1 and FIG. 3.

An expansion piece 3a for expanding the diameter of the coil end is attached to the guide tube 2 for fitting the stator core into which the tip of the bullet-shaped guide is bent.

3b'& install a pair. Each expansion piece 3a is moved forward and backward by the piston rod 4 inserted into the guide tube 2 from the rear end.
, 3b with a pair of tapered cones 5a, 5b and an engaging member 6
The coil forming jig 7 is fixed to one end of the bed 8, and the coil forming jig 7 is fixed to one end of the bed 8.
There is a core pedestal 9 that slides from the other end to one end. With this core holder 9, the coil ends lla and ll of the stator core 10 are
b is carried to a position where it fits into the expansion pieces 3a and 3b of the coil forming jig 7. In this state, the piston rod 4 is advanced through a cylinder mechanism (not shown), and the taper cone 5 is moved forward.
Expansion pieces 3a and 3bG that expand the diameter via a and 5b simultaneously push and spread the coil ends lla and llb to form a constant opening shape t.

In such a conventional forming device, as shown by the two-dot chain line in FIG. 3, the expansion piece 3b, which is smaller than the inner diameter of the iron core 10, is expanded in a radial shape to the position shown by the solid line as the piston rod 4 moves forward. , the coil end 11b is pushed out to the outer diameter of the Y iron core 10.

However, since the expansion piece 3b expands radially, the slot 13 adjacent to the slot (13m) into which the coil 12 is inserted cannot be reliably formed. When inserting the coil 12 into this slot 13f, the coil end 11b of the previously inserted coil 12 should be aligned with the slot 13 as shown in FIG.
Since the coil 12 is not molded to the bottom n, the insertion resistance is large and it is difficult to insert the coil 12 (sometimes it is not possible to insert it.)
Since the coil forming jig 7 drives the pair of expansion pieces 3a, 3b' simultaneously, the equipment cost is high. Iron core (If the implementation is difficult, replace the guide tube 2, expand pieces 3a, 3-b and taper cone 5a, depending on the thickness of the stator core and the dimensions of the coil end.
'5b5b Adjustment requires a saw jig and requires a long time to perform the adjustment operation.

Next, a second conventional example will be explained with reference to FIGS. 4 and 5.

The guide tube 2f for fitting the stator core has a cannonball-shaped guide 1 at the tip, and has a complicated shape! The molded blade 14 is attached to the slot 13 of the iron core 10 shown in FIG. 5, where the coil 12 is not accommodated. In this case, in the last step, the coil ends 11a and 1jb are formed into the desired shape and dimensions.
．． 5b are installed on the left and right sides of the forming blade 14 so as to be slidable on one side. Next, the molding method will be explained. coil 1
Insert the inserted stator core 10 along the guide tube 2, press the mold 15a & one coil end 11a, and press the mold 15b into the mold 15b as shown in Fig. The coil end 11b is also formed by sliding in the direction.

In this way (in this second conventional molding device, the molding blade 14 is inserted up to the bottom δ of the slot 13 in contrast to the first conventional ψ slot, so the coil end part is a slot). . Moreover, the adjustment of the stacking thickness direction of the iron core 10 can be effected by adjusting the movement wJik of the forming W15b using a stopper or the like.

However, the forming of the rising part of the coil L in the outer radial direction of the iron core 1O is due to the mechanism that only presses the forming molds 15m and 15b against the coil 12. There is a drawback that the coil shape is insufficient at the rising portion of the coil 12 on the side opposite to the lead wire, which is not U-shaped.

Therefore, the coil insertion resistance increases after the second time, and the coil 1
2 may be scratched or the slot insulator (not shown) may be damaged.

[Purpose of the invention]

The present invention improves the above-mentioned drawbacks by creating a coil forming device that is equipped with both a forming blade and an expansion piece and has a simplified mechanism, and uses the forming blade to reliably form a ζ-shaped coil end to the bottom of the slot. Another object of the present invention is to provide a method and a device for forming a stator coil, in which the coil end on the side opposite to the lead wire is formed into a predetermined shape using an extension piece.

[Summary of the invention]

The present invention is a method for forming a stator coil in which the coil ends protruding from both ends of the iron core are formed into a constant open shape using a coil forming jig ζ, in which a coil is housed in a groove in a stator core of a rotating electric machine. Move either the stator core or the coil forming jig to fit the stator core into the forming blade Q to expand the coil ends radially, then mold one coil end with a mold and mold it into the same shape. This is a method and apparatus for forming a stator coil in which the other coil end is expanded from the inner diameter using an expansion piece. As a result, after forming both coil ends with a forming blade, while pressing the coil end on the lead wire side with a forming die, the coil end on the opposite side to the lead wire is expanded and formed with an expansion piece.

Therefore, the expansion mechanism of the coil forming device becomes simple, and it becomes easy to form the coil end into a shape with predetermined dimensions.
It is also easy to change the setup of the coil forming device, which is economical.

[Embodiments of the invention]

Examples of the present invention will be described below with reference to FIGS. 6 and 7.
I will clarify. However, parts that are the same as those in the prior art described above are designated by the same reference numerals and detailed explanations will be omitted. Fig. 6 41 is a front view showing the state of the coil end before and during forming, showing a guide tube 2t for fitting the stator core 10 with a bullet-shaped guide 1 at the tip, and a coil end movable radially in the radial direction. An expansion piece 3 for expanding the diameter is attached, and a plurality of molding blades 14 are arranged radially at the subsequent stage.

Note that this molded blade 14 is inserted into the desired slot 13 (seventh
(as shown in the figure). As the piston rod 4 inserted into the guide tube 2 from the rear end moves forward and backward, the expansion piece 3 expands and contracts from the inside via a Taber cone as shown in Figure 2, which is provided inside the expansion piece 3.

The coil forming jig 18 constructed in this manner is referred to as a coil forming jig 18.

Next, the guide tube 2 is moved in the axial direction.
Place this. This mold 15 is arranged on the right side of the substrate 16 via a cylinder rod 17 that moves parallel to the bed 8. The piston rod 4 is disposed on the left side of the base plate 16, and the base plate 16 is fixed to the left end of the bed 8. At the right end of the bed 8, there is a core pedestal that slides toward the board 16 via a sliding mechanism 19 that can be moved left and right. The core holder 9 holds the loaded stator core 10″fjr, and the coil ends lla and llb are fitted into the forming blade 14 and the coil end 11a is in contact with the forming die 15, which is the first forming position, and the opposite side. The coil end 11b on the lead wire side is configured to be able to stop at the second forming position where it is fitted into the expansion piece 3.

The core pedestal 9 of the coil forming apparatus configured in this way is stopped at the ready position 0 shown by the solid line in FIG.
are stacked and held, and the coil end 11a on the lead wire side is opposed to the coil forming jig 18. And first, core pedestal 9
to the first forming position, and both coil ends 11 a, 11 b of the stator core 10 are moved to the forming blade 14.
When the molding blade 14 is fitted into the coil en)'Ila, the forming blade 14 moves in the axial direction through the slot 13 shown in FIG.
Expand llb toward the outer periphery. In this state, the coil end 11 on the lead wire side is pressed against the coil end molding recess 21 of the mold 15 to form a predetermined shape.

Next, the core holder 9 is moved back and slid to the second forming position (the position indicated by the two-dot chain line in FIG. 6), and the coil end 11b on the side opposite to the lead wire is fitted into the extension piece 3. Make it.

In this state, when a cylinder (not shown) is pressurized and moved through the rod 17 in the right direction ζ in FIG. The end molding recess 21 is engaged with the coil end lla# on the lead wire side.Then, the moving distance of the piston rod 4 is changed to the coil end 11 on the lead wire side.
Determine the outer diameter to match the outer diameter of a and move it forward (2) 6 right direction), and the expansion piece 3 will be attached to the coil end 11 on the side opposite to the lead wire.
b Expand the diameter of both coil ends 11.
a, 11b are formed into a predetermined opening shape.

Therefore, in the operation of only the extension piece 3 in the first conventional example, the coil 1
slot 1 next to 13 a
3 was not formed reliably, but the coil end portions 11a and llb were formed into slots 13 by using the forming blade 14.
The bottom of the coil 12 can be reliably formed at 23 years old, making it easy to insert the next coil 12. Since the expansion mechanism is on one side, the number of jigs for moving the stator core 10 is reduced, and the core thickness adjustment, ie, setup change, becomes easy.

In addition, in the second conventional example where the molding die 151 is only pressed, the diameter of the coil end 11b on the side opposite to the lead wire, which is not U-shaped, is expanded with the expansion piece 3, so that the outside of the stator core 10 is expanded. The rise of the coil in the radial direction was insufficient, but by using the forming blade 14, the coil end was molded securely until it reached the bottom of the slot 13, and the coil end 11 m on the lead wire side was molded using the forming die 15. Since the diameter of the coil end 11b on the warped single-wire side is expanded by the expansion piece 3 by pressing, the coil rises reliably as shown in Fig. 7, and the predetermined shape can be formed. 3 only, if the diameter of the coil end 11b on the side opposite to the lead wire is expanded, springback of the coil will occur, and the inner diameter of the already formed coil end 11H on the lead wire side will be reduced, but After forming the coil end 11a of
By expanding the diameter with the Y expansion piece 3, a coil end of a predetermined shape is formed.

〔Effect of the invention〕

As explained above, in the present invention, after forming both coil ends with a forming blade, while pressing the coil end on the lead wire side with a forming die, the coil end on the warped side is expanded and formed with an expansion piece. It is.

Therefore, since the expansion mechanism of the coil forming apparatus has a flat surface, it becomes easy to form the coil end into a shape with a predetermined dimension, and the setup of the coil forming apparatus can be easily changed, which is economical.

[Brief explanation of drawings]

Figure 1 (front view of conventional coil end forming equipment, Figure 2)
The figure is a cross-sectional view of the main part showing the state of conventional coil end molding, FIG. 3 is a cross-sectional view taken along the line I-1 in FIG. 2, and FIG. Fig. 5 is an explanatory diagram of the conventional molded plate (Fig. 6 is a front view of the main part of the coil molding device of the present invention, and Fig. 7 is a diagram of the molded blade and expansion piece of the present invention (Fig. 6 is an illustration of the conventional molded plate). It is an explanatory diagram. 1... Bullet-shaped guide, 2... Guide tube, 3.3a, 3
b... Extension piece, 4... Piston rod, 8... Bed, 9... Core pedestal, 10... Stator core, ll
a, llb...Coil end I2...Coil, 13
．． 13a...Slot, 14...Molded bood, ]5
...Mold, 16...Ice plate, 17...Rod, 1
8... Coil forming device, 19... Sliding mechanism section, (9
)...Molded plate kite, 21...Coil end molded recess, Ru...Bottom of slot. (7317) Agent: Patent Attorney Noriyuki Chika (
(1 person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] (υ Molding of a stator coil in which the coil ends protruding from both ends of the iron core with a groove in a stator core of a rotating electric machine are shaped into a certain open shape using a coil forming jig) In the method, either one of the core pedestal for loading and holding the stator core and the coil forming jig is fully moved to fit the stator core into the forming blade, and the coil end is expanded in the outer circumferential direction, and the core is expanded. Move the pedestal to the mold, place one coil end in contact with the coil end molding recess, and mold.
Moving the core pedestal to fit the other coil end into the expansion piece, restraining one coil end with the mold, and molding the other coil end radially from the inner diameter with the expansion piece. A method for forming a stator coil characterized by: (2) a guide cylinder having a bullet-shaped guide at the tip, a radially movable expansion piece at the middle, and a plurality of molded blades arranged radially at the rear; A piston rond is inserted from the rear end of this guide cylinder, and the tapered cone is valved by the forward and backward movement of the piston rond to expand and contract the expansion pieces radially, forming a molded blade guide that protrudes axially on the outer periphery of the guide cylinder. A mold having a concave part for forming a coil end (this mold is fixed, one side of the substrate is placed through a cylinder rond that moves parallel to the bed, and the piston rond is placed on the other side of the substrate). A stator coil molding device, in which the substrate is fixed to one end of the bed, and the other end of the bed has a core pedestal that slides via a sliding mechanism that moves from side to side.