JPS6366803A - Compound conductive paper winding - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel multi-conductor paper winding. More specifically, the present invention relates to a multi-conductor paper winding used for coil magnet wire in transformers and the like.

[Prior art] Conventional double-conductor paper windings have a craft structure on the outer periphery of two parallel wires that are insulated from each other, as seen in Japanese Utility Model Publication No. 31-7451 and Japanese Utility Model Publication No. 31-7452. It is made by wrapping paper and insulating it. There are two methods of insulating between two wires: one method is to wrap both wires with paper, and the other is to wrap only one wire with paper and wrap the other wire with bare wire. How to do it is done.

On the other hand, in recent years there has been a strong demand for smaller size and larger capacity transformers, and magnet wires with excellent dielectric breakdown voltage characteristics are desired. It has become desirable to have a multi-conductor paper winding with a high dielectric breakdown voltage between wires.

In conventional multi-conductor paper windings, the dielectric breakdown voltage between the strands can be improved by increasing the thickness of the kraft paper used or by increasing the number of turns of the kraft paper. However, multi-conductor paper windings made by using thicker kraft paper or increasing the number of turns of kraft paper have larger finished dimensions, hindering the miniaturization and larger capacity of electrical equipment, and furthermore increase manufacturing costs. The problem is that it is expensive.

A multi-conductor winding using an enamelled wire with excellent dielectric breakdown voltage characteristics as a wire can improve the intended insulating paper breakdown voltage without increasing the finished dimensions. However, the production cost of bare enamelled wire is much higher than that of paper-wound wire, and it cannot be used as a practical substitute.

Therefore, it is inexpensive and does not increase the finished dimensions.
Moreover, a multi-conductor paper winding wire with excellent dielectric breakdown voltage characteristics has been desired.

[Problems to be Solved by the Invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art described above, which lead to an increase in finished dimensions. The object of the present invention is to provide a multi-conductor winding that can significantly improve the dielectric breakdown voltage.

[Means for Solving the Problems] The gist of the present invention resides in a multi-conductor paper-wound wire characterized in that a powder-coated insulated wire is used as the wire.

In the present invention, the conductor shape of the strands is not particularly limited, but preferably rectangular conductive wires that can be easily arranged with their flat surfaces facing each other are suitable.

In addition, in the present invention, the powder coating resin preferably has good dielectric breakdown 73 voltage characteristics and good resistance to transformer oil, such as epoxy resin, polyester resin, polyester imide resin, acrylic resin, maleimide resin, etc. can be used. The thickness of these powder resins is not particularly limited, but desirably 30 to 120 μm is appropriate from the viewpoint of dielectric breakdown voltage, flexibility, and suppression of dimensional increase.

In the present invention, only one powder-coated insulated wire counts as ten points, but both may be powder-coated insulated wires.

In the present invention, the insulating paper used for outer insulation is kraft paper,
It may be made of cyanoethyl paper, semi-synthetic paper, aromatic polyamide woven fabric, etc., and its thickness may vary from 25μ to 55μ depending on the design specifications.
μ, 125μ, etc. can be used as appropriate.

[Function] The multi-conductor paper winding wire of the present invention uses powder-coated insulated wires as the wires, thereby significantly reducing the dielectric breakdown voltage between the wires without increasing manufacturing costs or finished dimensions. This is an improvement. In other words, the powder-coated insulated wire has a porous coated resin film layer with a m-plane with high and low heights, so the dielectric breakdown voltage is low as a single wire, but surprisingly, when it is made into a strand of multi-conductor paper-wound wire, the porous The high and low roughness of the surface creates an air gap between the adjacent strands and effectively improves the breakdown voltage.

[Example 1] Next, an example of the double conductor paper winding wire of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section showing an embodiment of the double conductor paper winding wire of the present invention. In FIG. 1, 1.2 is a rectangular conducting wire, and 3 is a powder resin film layer formed by powder coating the surface of the rectangular conducting wire 2. This powder resin film layer 3 is powder-coated with an epoxy resin powder coating, and has a thickness of 72 μm. 4 is kraft paper with outer circumference insulation, thickness 125
It is made of μm kraft paper wound twice.

Next, as a comparative example, a double conductor paper winding consisting of a combination of a paper winding and a rectangular bare conductor was obtained. Note that the paper winding wire used, the conductor dimensions of the rectangular bare conductor, and the outer peripheral insulation were the same as those used in Example 1. However, the insulating paper layer of the paper-wound wire is 110μ.
It is m. This is because kraft paper with a thickness of 55 μm, which is most commonly used for paper windings, is wound twice.

One meter of each of the example product of the present invention and the comparative example product thus obtained was sampled, and the dielectric breakdown voltage between the wires was determined to be 71111.
Established. The following table shows the results of these measurements.

As can be seen from the above table, the dielectric breakdown voltage between the cable wires in the example field of the present invention is much higher than that in the comparative example, even though the insulating layer of the wire is thinner.

[Effects of the Invention] The multi-conductor paper winding wire of the present invention can improve the dielectric breakdown voltage between cables without increasing the finished dimensions, is inexpensive, and is industrially useful as a magnet wire for miniaturizing transformer coils. It is.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the multi-conductor paper winding wire of the present invention. 1, 2: Conductor, 3: Powder resin film layer, 4: Outer insulation layer. Figure 1

Claims (1)

[Claims] (1) A multi-conductor paper winding wire characterized by using a powder-coated insulated wire as the wire.