JPS5951124B2 - Manufacturing method of multi-wound coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-wound coil used after a transformer or a reactor, and particularly to a method for manufacturing a multi-wound coil in which the entire coil is made to be integrated by using an adhesive material for the insulator. It is.

Conventionally, among the coils of transformers, multi-wound coils are made by winding a coil conductor 2 in multiple layers on an inner peripheral insulator 1, and inserting a sheet-like interlayer insulator 3 for each winding layer, as shown in Fig. 1. At the same time, an end filler 4 made of a strip-shaped member such as a press board is inserted into the end of the wound layer to prevent the coil conductor 2 from slipping and to improve the strength of the coil.

In order to be able to withstand the most severe operating and testing conditions up to short-circuit loads, such coils are either doused in varnish or other adhesive materials, or coated with the interlayer insulation 3 mentioned above. A resin adhesive coating such as epoxy applied to one or both sides of a sheet-shaped insulator, or a resin adhesive coating made into a diamond shape, circular shape, etc.
A coil conductor 2 and an insulating layer 3 are formed into a discontinuous shape such as a rectangle, and the above-mentioned resin adhesive coating such as epoxy is cured by heat treatment for dehumidifying the coil.
, 4 are being integrated. However, the former method has drawbacks such as dielectric breakdown caused by the board containing gas or air generated when varnish or the like is applied, and a decrease in bonding strength due to insufficient impregnation.

On the other hand, the latter method has disadvantages in that it is not easy to manufacture the coil and its quality is not stable. That is, the interlayer insulator 3 is made by cutting a sheet of insulating paper having a resin adhesive coating corresponding to the width of the coil including the end stuffing 4 to match the circumference of each winding layer coil, and then winding a predetermined number of sheets in layers. It is fixed by wrapping cotton tape or polyester adhesive tape on top. Therefore, wrinkles and creases are likely to occur in the interlayer insulating material 3, and the interlayer insulating material 3 does not fit well with the circumferential surface of the coil, resulting in curling. Even if such a coil is subjected to heat curing treatment, sufficient adhesion between the insulating layer and the coil conductor at the wrinkled and bulged portions of the insulating layer and the insulating layer and the coil conductor may not be obtained, resulting in a decrease in insulation properties and variations in finished dimensions. It also has drawbacks such as being weak against vibrations and electromagnetic mechanical forces. In terms of work, the coil winding work is a combination of different work: winding the coil conductor 2 and inserting the insulators 3 and 4.
For each winding layer, the required number of sheets must be cut to match the circumferential length of the coil, and the end fillings 4 and 4 must be wound one on top of the other and individually marked with tape or the like. . 4 This has the disadvantage that the work is discontinuous and the work time is long.

On the other hand, from the material standpoint, the coil widths differ depending on the various coil specifications due to differences in model, capacity, etc.
Interlayer insulation is required according to each specification, and end filling 4
The materials used for and the interlayer insulator 3 are different. Therefore, the production, preparation, storage, storage space, etc. of insulators are required, making the work and production administration even more complicated. The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to provide a multi-wound coil structure that is resistant to electromagnetic mechanical forces without causing wrinkles or bulges, and which is insulated. The objective is to obtain a manufacturing method that allows for standardization of materials and shortening of working time.

An embodiment of the present invention will be described below based on the drawings.

In Figure 2, a resin adhesive coating (incompletely cured state) made of resin such as epoxy is applied to the entire area on one or both sides, or the resin adhesive coating is made into a diamond shape, or discontinuously in a circular, rectangular, etc. shape. The winding start part 13a of the tape-shaped insulating paper 13 and the winding start part 12 of the coil conductor 12
A is fixed at a predetermined position on the inner peripheral insulator 11, and winding is started at the same time. In this case, the coil conductor 12a is wound so as to proceed in the direction of arrow A, and the tape-shaped insulating paper 13a
is wound so as to form a layered end filling 14a.
After one winding, the coil conductor 12a becomes 12. The process advances to position n1, and the tape-shaped insulating paper 13 completes the formation of the end filling 14a. Thereafter, the coil conductor 12 is continuously wound up to n times 12. Proceeding to position n, the formation of the first wound layer is completed. On the other hand, the tape-shaped insulating paper 13 is an interlayer insulating material 15a.
In order to form the coil conductor 12, the coil conductor 12 is wound on the winding layer with an appropriate wrap in the direction of arrow A, and after n turns, the coil conductor 12. 13. on n. When the n position is reached, the first
Complete the formation of end filling and interlayer insulation. Next, the coil conductor 12 is connected to the winding end portion 12 of the winding layer in FIG. Start of winding of the second winding layer from n 12. Then, the tape-shaped insulating paper 13 moves to the winding position 13.n+1 of the end stuffing 14b. Move to n+1. Thereafter, the coil conductor] 2 is wound in the direction of arrow B, and after n turns, it reaches a position of 12.2h, completing the formation of the second wound layer. In the meantime, the tape-shaped insulating paper 13 is laminated to form the winding end filling 14b, and then the coil conductor 1 is stacked to form the interlayer insulating material 15b.
The coil conductor 12 is wound on the second winding layer of No. 2 in a suitable lap in the direction of arrow B. After n turns, the coil conductor 12
．． 13. on 2n. It is wound to the n position to complete the formation of the second end filling and interlayer insulation layer. Thereafter, the coil conductor 12 and tape-shaped insulating paper 13 are wound in the same manner to form end fillers 14C, 14d and interlayer insulating layers 15C, 15d for the third and subsequent winding layers, and the end portion of the final winding layer is formed. and coil conductor 12. After fixing Z, end filler 14C is wound to complete all coil winding. Then, heat treatment is performed at a temperature of approximately 110°C to 130°C to dry the coil. By this heat treatment, the resin adhesive coating such as epoxy applied to the tape-shaped insulating paper 13 is once softened, and the gap between the overlapping parts of the tape-shaped insulating paper 13 and the space between the tape-shaped insulating paper 13 and the coil conductor 12 is softened. The multi-wound coil, including the interlayer and end insulation 14, 15, is bonded and gradually cured to solidify the coil together. Incidentally, if the above-mentioned heat treatment is performed in a vacuum tank, gas, especially air, can be removed from the coil at the same time as the resin adhesive coating is cured. Furthermore, if necessary, the entire coil can be impregnated with a liquid dielectric such as insulating oil. Since the multi-wound coil manufactured by the method described above uses the narrow tape-shaped insulating paper 13 to form the interlayer insulating layer 15, the interlayer insulating layer 15 can be made of either square wire or round wire. Coil conductor] 2 is well-familiarized along the circumferential surface of the wound layer, with no wrinkles or bulges, and no unbonded portions of the resin adhesive coating.

Furthermore, the use of different materials is reduced, and since the coil conductor 12 and the tape-shaped insulating paper 3 are wound continuously and alternately, uniform tension can be applied to the parts used, and the entire coil is covered with a resin adhesive coating. Because it is strongly integrated by
It is possible to obtain a multi-wound coil that is resistant to electromagnetic mechanical forces and has improved insulation properties. Furthermore, by matching the number of turns of the coil conductor 12 and the number of turns of the tape-shaped insulating paper 13, the end filling 12 and the interlayer insulating layer 15 can be formed at the same time as the coil conductor 12 is wound, which facilitates automation of the coil winding work. , the process can be significantly shortened. Furthermore, in terms of production management, 1
There is no longer a need for one-size-fits-all interlayer insulation, it is now possible to use a tape-shaped insulating paper that is common to several models, and there is no need to make special sized end fillings, greatly increasing the variety of insulation materials. It can be reduced. Moreover, this simplifies administrative procedures, reduces inventory, and shortens delivery times for obtaining materials. It also has many advantages, such as the yield of the insulating material used is nearly 100%.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional multi-wound coil, and FIG. 2 is a cross-sectional view showing an embodiment of the multi-wound coil manufactured according to the present invention. 11... Inner circumference insulator, 12... Coil conductor, 12a... Winding start portion, 12. Z...
... End of roll, 13 ... Tape-shaped insulating paper, 13
a... Beginning of volume, 14a to 14e...
...End filling, 15a to 15d...Interlayer insulator.

Claims (1)

[Claims] 1. At the same time as the process of winding a coil conductor to form one winding layer, winding the winding layer so as to laminate a tape-shaped insulating paper having a resin adhesive coating on at least one side at the end of the winding start side of the winding layer. After forming the end stuffing, the tape-shaped insulating paper is then wound over the wound layer of the coil conductor to form an interlayer insulating layer, and these steps are repeated to form a predetermined layer. A method for manufacturing a multi-wound coil, which comprises forming a multi-wound coil having a number of winding layers, and then heating and curing the resin adhesive coating of the tape-shaped insulating paper.