JPH0468761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transformer coil in which several types of windings are laminated from the inside on a concentric shaft.

Conventional configuration and its problems When a short-circuit accident occurs in a transformer, electromagnetic mechanical force is generated between the windings. Adhesion is the most important. However, in conventional transformers, the first
As shown in Fig. 2, the inner winding 1 and the outer winding 2
The inter-winding insulating layer interposed between the inner winding 1 and the inner winding 1 is formed by winding the insulating paper 3 of approximately the width of the coil after the winding of the inner winding 1 is completed, resulting in surface contact between the inner winding 1 and A drawback was that the adhesion to the mutual insulating paper 3 was weak.

Furthermore, the fixing tape 5 of the rising wire 4 of the inner winding 1 causes unevenness on the inner winding surface due to the influence of the thickness of the rising protection plate 6, and the adhesion between the inner winding 1 and the inter-winding insulating layer is deteriorated. It was making it worse. In addition, in order to improve adhesion, methods such as clamping the coil by applying pressure from the outside after the coil is completed, or reinforcing the coil core with metal fittings from the outside after the coil core is assembled, reduce manufacturing man-hours, number of parts, and jigs. It had the disadvantage of increasing the number.

Purpose of the Invention The present invention was made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to improve the destructive strength of windings against electromagnetic mechanical force generated between windings when a short circuit accident occurs. That is.

Structure of the Invention In the present invention, a tape-shaped insulating paper is wound half-lap around the innermost periphery of the inter-winding insulating layer to improve the adhesion between the inner winding and the inter-winding insulating layer.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 3 and 4. In addition, the same components in the above-mentioned conventional configuration are given the same numbers, and the explanation thereof will be omitted. As shown in the figure, the insulating layer between the windings is composed of a tape-shaped insulating paper 7 smaller than the coil width and an insulating paper 3 having the same width as the coil. First, interlayer insulating paper is applied to the uneven surface of the inner winding. To ensure close contact, the tape-shaped insulating paper 7 is half-wound. Furthermore, in order to make the surface flat, the concave portions are wrapped in layers as necessary. Next, an interlayer insulating paper 3 having the width of the coil is wound thereon to form an insulating layer between the windings. This improves the adhesion between the inner winding 1 and the interlayer insulating layer.

In order to improve the adhesion between the inner winding 1 and the mutual insulating layer, if the tensile force applied to the insulating paper to be wound is the same, the narrower the width of the tape-shaped insulating paper 7, the greater the adhesion. Therefore, the tape width dimension may be appropriately selected depending on the required degree of adhesion.

Further, since the tape-shaped insulating paper 7 is half-wound, there is no need to increase the thickness required for mutual insulation performance.

Adhesion between the windings and the mutual insulating paper is achieved by using adhesive insulating paper impregnated with varnish and pre-applied with adhesive, but when comparing the mechanical strength of the coil with conventional products, it is found that the use of adhesive insulating paper is particularly effective. can be expected.

Effects of the Invention As explained above, the present invention improves the adhesion between the windings by half-wrapping a tape-shaped insulating paper around the innermost circumference of the inter-winding insulating paper. The strength of the coil against electromagnetic mechanical force can be improved, and effects such as eliminating clamping work and simplifying auxiliary fittings can also be achieved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional transformer in which insulating paper is wrapped between each other, Fig. 2 is a sectional view showing a completed state of the coil of the conventional transformer, and Figs. 3 a and b according to the present invention. FIG. 4 is a perspective view showing a state in which the inter-insulating paper is rolled up, and FIG. 4 is a sectional view showing a completed state of the coil of the present invention. 1... Inner winding, 2... Outer winding, 3... Insulating paper, 7... Tape-shaped insulating paper.

Claims (1)

[Claims] 1 A plurality of coils having an innermost layer of tape-shaped insulating paper wound half-wrap, and an inter-winding insulating layer formed by wrapping an insulating paper of approximately the same width as the coil width between each winding. A coil in which the windings are laminated on a concentric axis.