JPS5951728B2 - multi-turn coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Description of the Technical Field The present invention relates to a multi-turn coil used in transformers, reactors, etc.

(b) Description of Prior Art Conventionally, among the coils of a transformer, a multi-wound coil has a coil conductor 2 wound in multiple layers on an inner peripheral insulator 1, as shown in FIG. , an interlayer insulator 3 is inserted, and end pads 4 are also inserted at the ends of the wound layers to prevent displacement of the coil conductor 2 and improve the strength of the coil.

Such a multi-wound coil is formed by repeating the steps of winding the coil conductor 2 for one layer, then winding and inserting the interlayer insulator 3, and then inserting the end filler 4. ing. However, since these operations are independent from each other, the coil winding operations are discontinuous, which takes a lot of time and is a major obstacle in promoting automation. In addition, from the viewpoint of materials, the coil width differs depending on the various coil specifications, and a correspondingly wide variety of interlayer insulators 3 are required. Therefore, not only does the production and storage of various interlayer insulators 3 become more complicated, but also wide wrinkles, creases, etc. occur during coil winding, and winding blisters are likely to occur on the circumferential surface of the coil. This also led to a decrease in insulation properties and variations in finished dimensions. (c) Purpose of the Invention The present invention eliminates the above-mentioned drawbacks, shortens working time, facilitates automation, and also facilitates standardization of types of insulating materials, improves yield, improves production management, and rationalizes insulation. It is an object of the present invention to provide a multi-wound coil that reduces machining defects and is resistant to short-circuit mechanical force, and a method for manufacturing the same.

(d) Structure of the Invention The multi-wound coil of the present invention is constructed by winding a tape-shaped insulator coated with an uncured thermosetting resin on at least one side of the coil, excluding both edges, at the same time as the coil conductor is wound. The insulator and end filler are formed continuously.

Hereinafter, the multi-wound coil of the present invention will be explained with reference to the drawings.
In FIG. 2, the winding start portion 8 of the coil conductor 8 fixed at a predetermined position on the inner peripheral insulator 7 is sequentially wound in the direction of the arrow. On the other hand, the tape-shaped insulator 9 is also wound simultaneously from the winding start portion 9, and the end tabs 10a are laminated and formed.

After winding nl times, the conductor 8 has progressed to a certain point of 8nl, and the tape-shaped insulator 9 has completed the formation of the end cap 10a. After that, the conductor 8 is sequentially wound up to n times and advances to the position 8n, and the tape-shaped insulator 9 is wound with an appropriate lap over the wound conductor 8n to form an interlayer insulator Ila. After winding, winding on the conductor 8n is completed. This completes the formation of the first layer. Next, the conductor 8 moves from the end portion 8n of the first layer to the second layer, and the conductor 8nf
, sequentially conductor 8. It is wound up to n and progresses. In the meantime, the tape-shaped insulator 9 forms the end filler 10b, and then moves on to the formation of the interlayer insulator 11b. Conductor 8. At the same time as the conductor 8 is wound, the tape-shaped insulator 9 is also wound with an appropriate wrap on the conductor 8 to complete the second layer of coil winding. Thereafter, all the coil windings are completed by winding the third layer and subsequent layers in the same manner.

In the coil of the present invention, a tape-shaped insulator 9 is used instead of a wide interlayer insulator, and the interlayer insulator is formed with appropriate wrapping. In this case, the tape-shaped insulator 9 should be coated with a fully cured thermosetting resin on one or both sides, either entirely or in a diamond shape, except for both edges, and the aforementioned resin should be hardened and fixed when the coil dries. This is to measure the improvement of the mechanical strength of the coil. The tape-shaped insulating material 9 used in the coil of the present invention is made by applying resin 21 to at least one side of a wide insulating material 20 in a strip shape at predetermined intervals, as shown in FIGS. 3a and 3b. The unfilled portion is cut by a slitter 22.

In this case, if the width of the tape-shaped insulator 9 is Y, then the resin 21
It is desirable that the width X of the coated surface is at least (1/2Y) or more. (e) Effect of the Invention In the coil using the tape-shaped insulator 9 according to the present invention, the interlayer insulator and the end tabs can be wound at the same time as the conductor, and the automation of coil winding saves a large amount of man-hours. It is possible to reduce
The standardization of materials improves the material yield, and since the tape-shaped insulator 9 can be wound tightly around the coil conductor, a strong coil can be manufactured.

Also, regarding the production of the tape-shaped insulator 9, the entire surface or
A wide insulating material coated with diamond-shaped uncured thermosetting resin 21 in a band shape is slipped in the areas where no resin is applied, so that a large amount of resin powder is not scattered and work efficiency is significantly improved. can. . Furthermore, wrinkles, creases, etc. do not occur in the tape-shaped insulating material 9, and when it is wound around a coil, resin powder does not come out due to tension rollers, etc., and processing defects do not occur. The insulation of the coil can be improved. In addition, as shown in FIG. 2, when forming an interlayer insulator by wrapping the tape-shaped insulating material 9 by 1/2, for example, the tape-shaped insulating material 9 is subjected to final curing heat treatment over a width of at least 1/2 or more. Adjacent tape-shaped insulators 9 are bonded to each other by applying the chemical resin 21, and the coil conductor 8 wound in the next layer is also bonded to the tape-shaped insulator to provide strong mechanical strength. , a strong coil can be formed. The oil impregnation property is also very good because a tape-shaped insulator is used. (f) Other embodiments of the invention In the above explanation, one resin is coated on one tape-shaped insulating material, but the same result can be obtained even if multiple resins or both surfaces are coated in the same pattern. effective.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional multi-wound coil, Fig. 2 is a sectional view of a coil of the present invention, and Figs. It is a perspective view showing a state. 1... Inner circumferential insulator, 2... Coil conductor, 3... Interlayer insulator, 4...
End filler, 5... Main insulator, 6...
...Duct piece, 7 ...Insulation tube, 8...
... Coil conductor, 9 ... Tape-shaped insulator,
10... End filler, 11... Interlayer insulator, 20... Wide insulator, 21...
・Applied thermosetting resin, 22...Sliver one.

Claims (1)

[Claims] 1. An interlayer insulator formed by winding a tape-shaped insulator so as to overlap in the width direction is interposed between the layers of a wound layer formed by winding a coil conductor, in which the tape-shaped insulator includes: A multi-wound coil characterized by using a tape-shaped insulator coated with thermosetting resin except for both edges.