JPS6240943B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a winding body comprising a core having a large number of teeth and slots formed between adjacent teeth, and a winding wound around the core through the slots. In particular, the present invention relates to a manufacturing method thereof.

BACKGROUND ART In rotating electric machines such as generators and electric motors, a wound body in which wires are wound through slots between the teeth around a core having a large number of teeth is widely used as a stator or rotor. In this type, the tip of each tooth of the core is formed in a shape that widens on both sides, so the opening of each slot is usually narrower than the inner part.

Conventionally, such a winding body has been made by preparing a core previously formed into a final shape and winding the core. However, this manufacturing method has the drawback that the winding wire must be inserted into the slot through the narrow opening as described above during the winding process, making the winding process complicated and time-consuming. It was hot. In addition, it is difficult to wind the windings in an aligned manner, and even though improving the area occupied by the winding in the slot greatly contributes to the miniaturization and higher performance of rotating electric machines, it is difficult to improve the area occupied by the winding in the slot. There was a drawback. Furthermore, the width of the opening of the slot must be at least wide enough to allow the winding to be inserted during winding work, so the width of the widening part at the tip of each tooth is restricted, and as a result, There was a problem in that the performance and quality of the rotating electric machine were also restricted.

For this reason, a method is known, as disclosed in Japanese Utility Model Publication No. 36-4029, in which the winding is housed in a slot and then the tips of the teeth are spread out to both sides. However, when actually manufactured using this method on an automated line, the winding, which is once completely housed in the slot, may slip out of the slot or outside due to vibrations from the assembly equipment, gravity, or the elasticity of the winding itself. There was a problem that some parts were protruding even into the vicinity. In particular, this problem often occurs in those in which teeth are present on the inner periphery of the core rather than on the outer periphery. If this happens, in the next automatic process, when the tips of the teeth are pushed apart to both sides, the pressure of the pushing tool may damage the windings, resulting in poor insulation, or the windings may be pushed out of the slot. There was a problem in that defective products were sometimes produced with parts sticking out.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method of manufacturing a winding body for an electric machine that can prevent such problems from occurring, is suitable for automation, and can provide a winding body for an electric machine of good quality.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking as an example a stator for a rotating electric machine in which teeth are present on the inner periphery of the core.

FIG. 1 shows a part of the stator core before winding is applied, and in the present invention, this is first prepared. This core 1 has a ring shape as a whole, and has a large number of teeth 2 on the inner periphery, and a slot 3 is formed between adjacent teeth 2. At this point, each tooth 2 is located at the tip. Leave it in a straight shape with no flared parts. Therefore, the width of each slot 3 is made substantially uniform both at the opening and at the back. At the tip of each tooth portion 2, a recess 4 is formed leaving tongue portions 2a on both sides in the circumferential direction.
Set it up.

As shown in the figure, the entire tooth portion is made straight so that the inner wall of the slot from the back (bottom) of the slot to the tongue portion 2a is smooth and free of steps.

The core 1 is made, for example, by spirally winding and laminating a core material having the teeth 2 of the shape described above from a band-shaped iron plate. Alternatively, a ring-shaped core material having the shape shown in Figure 1 is punched out of an iron plate,
It can also be made by laminating multiple sheets.

Next, a winding 5 is applied to the core 1 through each slot 3. The winding 5 may be wound into a pattern as is well known, or each wire may be wound loosely in the slot using a winding machine. The state in which this winding 5 is applied is shown in FIG. At this time, the winding 5 is inserted into the inner part through the opening of each slot 3. Next, the winding 5 is pressed into the deep part of the slot 3 using a tool (hereinafter referred to as an insertion arrow 6) to form a sufficiently dense winding 5 in the deep part of the slot 3.

At this time, since there is no step on the inner wall of the slot, the winding will not be damaged and the insulation performance or mechanical strength will not deteriorate. In addition, since the insertion arrow 6 does not have the above-mentioned step, it can be inserted smoothly, and even the insertion arrow 6, which is wide in the circumferential direction, can smoothly enter the slot, so that the entire winding can be inserted without applying strong local pressure to the winding. Can be moved and compressed without damaging it.

In addition, as mentioned above, since the opening of each throttle 3 has approximately the same width as the inner part, it is easy to insert the windings 5 into each slot, and a sufficient number of windings can be placed in each slot in an orderly manner. can be done.

In this way, in the above embodiment, it is possible to smoothly insert the insertion arrow 6 having a sufficient width into each slot, and thereby the winding can be compressed uniformly to the deep part of the slot. Coupled with the fact that the windings can be wound in an aligned manner, even if the slot is small, a sufficient amount of winding can be placed inside the slot. In addition, the entire tooth part is straight,
Since there is no step (step) between the tongue 2a and the slot bottom, the winding 5 is connected to the core 1.
There will be almost no damage caused by the tips of the teeth. Furthermore, because the teeth are provided on the circumferential side rather than on the outer periphery, the opening of the slot 3 has approximately the same width as the inner part, allowing smooth insertion of the winding 5 or the wide insertion arrow 6. The important point is that it becomes possible.

Note that before the winding work described above, insulating paper (not shown) or the like is inserted into each slot 3 of the core 1 to provide slot insulation.

After winding 5 as described above, a suitable tool is applied to the recess 4 at the tip of each tooth 2 of the core 1, and each tongue 2a is expanded to both sides in the circumferential direction to improve magnetic permeability. A widened portion 7 is formed. Then, a stator as shown in FIG. 3 is completed.

According to the stator manufacturing method described above, the winding work is easy and the working time can be shortened, as described above, and the winding wire is deformed by being pushed toward the inner part within the slot 3. Therefore, a part of the winding does not come out of the slot 3, and the winding gets in the way, preventing the widening part from being formed properly, or damaging the winding. This makes it suitable for automated lines that produce continuously in a short period of time. Furthermore, the area ratio occupied by the winding 5 within the slot 3 is improved. Therefore, the inner diameter of the stator can be increased by minimizing the depth (radial dimension) of the slots, and it is possible to improve the performance of a rotating electric machine employing such a stator. In other words, if the same performance as the conventional one is maintained, the rotating electric machine can be made smaller.

Furthermore, the gap 8 (width of the opening of the slot) between the widened end portions 7 of adjacent core tooth portions 2 can be arbitrarily reduced regardless of the winding 5. Generally, it is known that the magnetic noise of a rotating electric machine can be reduced by reducing the gap 8, and the method described above makes this possible.

Note that the present invention is applicable not only to the stator for a rotating electric machine as explained in the above embodiment, but also to a rotor for a rotating electric machine (a rotor having a shape as shown in Fig. 3 and rotating in the circumferential direction) as long as it has teeth on the inner periphery. ), and can also be applied to general electrical machinery windings such as transformers, electromagnets, and instrument windings.

As described above, according to the present invention, the tooth portion is provided on the inner periphery, and the shape of the tooth portion is straight,
In addition, since it has a smooth shape with no step between the tongue and the bottom of the slot, the winding will not get caught when inserted, so it can be assembled at high speed without damaging the winding. Furthermore, since the insertion arrow does not get caught in the slot, it is possible to smoothly and quickly insert the insertion arrow with sufficient width.
Therefore, it is possible to improve the space factor of the winding in the slot, thereby contributing to higher performance of electrical equipment.

[Brief explanation of the drawing]

The figures serve to explain the method of the present invention, and FIG. 1 is a cross-sectional front view showing a part of the core before winding, and FIG. 2 is a cross-sectional front view showing the core after winding. , FIG. 3 is a cross-sectional front view showing the completed state of the winding body. 1...core, 2a...tongue, 2...tooth, 3...
...slot, 4... recess, 5... winding, 6... insertion arrow forming a tool, 7... widening part.

Claims (1)

[Claims] 1. It has a large number of straight teeth on the inner periphery, and a recess is provided at the tip of the tooth with tongues left on both sides in the circumferential direction, so that adjacent straight teeth Prepare a ring-shaped core in which a slot is formed between each part, and the inner periphery of the slot from the bottom of the slot to the tongue part at the tip of the tooth part is smoothly formed without a step, and A winding consisting of a bundle of a plurality of magnet wires is housed in the slot in a tight or loose state without being compressed at the bottom of the slot through between the ends of the magnet wires, and then the entire bundle of magnet wires is inserted into the slot. In order to move and compress the entire winding to the back of the slot by pressing the wire toward the bottom of the slot in the slot, a tool is inserted into the slot from between the straight teeth, and then the straight 1. A method of manufacturing a winding body for an electrical machine, characterized in that the tongue portion at the tip of the shaped tooth portion is spread to both sides and the tongue portion is positioned at the opening of the slot.