JPS6342844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing flat transformer windings.

Needless to say, the transformer windings are useless if they are not completely insulated, as short circuits may occur. Currently, the majority of transformer windings are wire wires coated with enamel and insulated, but some aluminum flat wires are also used. This flat wire is usually manufactured by laminating aluminum foil and synthetic resin film and cutting it to the required width, so the aluminum foil is exposed at the cut edge, and if used as is as a transformer winding, short circuits often occur. It happens. Therefore, it becomes necessary to further insulate the cut edge, which reduces productivity and causes an increase in cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide a method for producing a flat wire with excellent insulation properties in an extremely simple and inexpensive manner.

Next, details of an embodiment of the present invention will be explained based on the accompanying drawings showing an embodiment of the present invention.

As shown in the figure, first, a metal layer 1 that is a good electrical conductor,
For example, an aluminum foil layer and an insulating layer 2 made of a synthetic resin film such as polyester or high-pressure polyethylene are laminated. The lamination method may be by using an adhesive or by extrusion. Alternatively, a metal having good electrical conductivity may be vacuum-deposited on the surface of the insulating layer 2.

Next, an etching resist agent layer 3 is formed on the surface of this metal layer 1 with a desired width and spacing. As the etching resist agent, for example, vinyl resin paint or epoxy resin paint is used.
These paints are printed on the surface of the metal layer 1 to form a stripe pattern.

Note that the above process may be reversed and the insulating layer 2 may be formed after printing on one side of the metal layer.

After the resist agent layer 3 is sufficiently dried, an etching process is performed using a ferric chloride solution, a caustic soda solution, etc., and as shown in FIG. 2, and dissolve and remove the other metal layer parts,
After that, neutralization, washing with water, and drying treatment are performed.

Next, the wire is cut from the portion indicated by A in FIG. 2 to obtain a long flat wire. This flat wire is connected to the insulating layer 2.
Since the side edges of the metal layer 1 protrude from both side edges of the metal layer 1, the side edges of the metal layer 1 will not be exposed even when wound into a coil, and may come into contact with the side edges of the adjacent metal layer and cause a short circuit. There is no fear at all.

According to the present invention, as described above, a flat wire with excellent insulation properties at the side edges can be obtained extremely easily and inexpensively, and a flat wire with a width suitable for each application can be obtained in a single processing step. Since it can be manufactured with

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing the manufacturing process of a flat wire according to the present invention. 1... Metal layer, 2... Insulating layer, 3... Etching resist agent layer.

Claims (1)

[Claims] 1. Before or after laminating a metal layer with good electrical conductivity and an insulating layer, an etching resist agent layer is formed on the surface of the metal layer with a desired width and spacing, and an etching process is performed to obtain the above width. and a metal layer having a gap remaining on the insulating layer,
1. A method of manufacturing a flat transformer winding, characterized in that the insulating layer is cut in the middle between adjacent metal layers so that the side edges of the insulating layer protrude from the side edges of the metal layers.