JPS6042409Y2 - flat insulated wire - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in rectangular insulated wires used for transformer coils, rotating machines, etc.

As an insulated wire of this type, instead of one in which an insulating tape is wound horizontally around a rectangular conductor so that the side edges thereof overlap, a type in which the insulating tape is laid vertically so that both side edges overlap each other is attracting attention.

However, in such a configuration, the insulation in the edge direction of the conductor becomes thinner, so when this is used as a coil, there is a problem that the dielectric breakdown strength between turns is low and reliability is lacking.

This idea was made based on this point, and its gist is that insulating tape is placed on a rectangular conductor cut out from two flat faces and two edge faces so that both edges overlap each other. A rectangular insulated wire, which is characterized in that an inner layer insulating tape is arranged vertically so as to continuously cover three surfaces, two flat surfaces directly above the rectangular conductor and two edge surfaces, in a rectangular insulated wire formed by vertically oriented wires. It's on the wire.

That is, as a result of intensive study by the inventors of the present application on improving the insulation strength of the edge surface, which is a drawback of vertical winding, the inventors of the present invention have developed a method that continuously covers three surfaces: the flat surface directly above the rectangular conductor and the two edge surfaces. It has been discovered that the insulation strength of the edge surface can be significantly improved by arranging the insulating tape vertically as shown in FIG.

In other words, the insulation strength of the edge surface cannot be improved by increasing the inner layer insulating tape only directly above the edge surface of the rectangular conductor, but by continuously covering the two edge surfaces and the flat surface. This is because the insulation strength can only be effectively improved in some cases.

This is because the insulation strength can be continuously and synergistically improved from the interface between the flat surface and the edge surface, where electrical stress is large, to the edge surface.

Next, an embodiment of the rectangular insulated wire of the present invention will be described with reference to the drawings.

The drawing is a partially cutaway perspective view showing an embodiment of this invention, in which 1 is a rectangular conductor, 2 is an insulating tape, and 3 is a tape that continuously covers the flat surface and the edge surface that characterize this invention. Inner layer insulation tape.

This inner layer insulating tape was simply attached vertically, and no adhesive was used at all.

Therefore, there is no concern that the electrical characteristics of the transformer oil will deteriorate due to adhesive contamination.

Although a rectangular conductor is used in this invention, a rectangular enamelled wire can also be used.

As detailed above, the rectangular insulated wire of this invention can effectively improve the insulation strength of the edge surface, and is industrially advantageous.

[Brief explanation of the drawing]

The figure is a partially cutaway perspective view showing an example of an insulated wire according to this invention. 1: Rectangular conductor, 2: Insulating tape layer, 3: Inner layer insulating tape, 4: Overlapping.

Claims (1)

[Scope of utility model registration request] In a rectangular insulated wire consisting of a rectangular conductor consisting of two flat faces and two edge faces, and an insulating tape placed vertically on the rectangular conductor so that both edges overlap each other, the flat face directly above the rectangular conductor -
A rectangular insulated wire characterized in that an inner layer insulating tape is arranged vertically so as to continuously cover three sides, a face and two edge faces.