JPS6128331Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Technical field of invention) The present invention relates to a grouped enamelled wire.

(Prior art and its problems) Conventionally, the winding wire used in large-capacity power transformers is made by twisting several or several tens of rectangular enamelled wires in a continuous manner in advance, and wrapping paper or the like on top of the wires. So-called transposed rectangular stranded wires are used.

In recent years, as the magnetic flux of large-capacity transformers increases, wires with smaller cross-sectional areas are required.

For example, as shown in FIG. 1, there is a so-called Ritsu wire 2 made by twisting a plurality of enamelled wires 1, and a rectangular Ritsu wire 3, which is the aforementioned Ritsu wire compressed into a flat shape, as shown in FIG. It is being considered.

However, although the former Ritsutsu wire has good flexibility, it has the drawbacks of poor mechanical strength and poor space factor due to its round shape, while the latter rectangular Ritsutsu wire is compression molded and therefore has the disadvantage of being inferior in space factor. Although the factor could be improved, the mechanical strength still remained unimproved.

(Purpose of the invention) The object of the invention is to provide a collective enamelled wire that has an excellent space factor, good mechanical strength, and excellent winding workability.

(Structure of the invention) The present invention uses a stranded wire in a shape such as a flat shape, which is made by twisting a plurality of self-bonding enameled wires and general enameled wires without a self-bonding layer in an alternating arrangement. It is characterized by compression molding.

(Embodiment of the invention) The invention will be described based on an embodiment shown in the drawings.

In FIG. 3, 4 is a self-bonding enameled wire, which is an ordinary enameled wire 7 having an enamel insulating film 6 made of formal resin or the like on a conductor 5, and then a heat-melting film of phenoxy resin, polyvinyl butyral resin, etc. An attached layer 8 is provided.

The assembled enameled wire of the present invention is obtained by twisting a plurality of self-bonding enameled wires 4 and a plurality of ordinary enameled wires 7 in an alternating arrangement, and then compression-molding them into a flat shape. .

The assembled enamelled wire of the present invention is heated to a predetermined temperature after winding, and the strands are fused together for use.

(Effects of the invention) Since the assembled enamelled wire of the invention thus obtained is twisted, it has excellent flexibility during coil winding and has good winding workability. Furthermore, since it is formed into a flat shape, the space factor of the coil is excellent, and since the strands are fused together, the mechanical strength of the coil is improved. Moreover, since not all the wires are self-bonding enamelled wires, it is economical.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing an example of a conventional grouped enamelled wire, and FIG. 3 is a cross-sectional view showing an example of the grouped enamelled wire of the present invention. 1, 7... Enamel wire, 2... Ritsutsu wire, 3
...Flat rectangular wire, 4...Self-bonding enameled wire.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A stranded wire consisting of a plurality of self-fusing enamelled wires and a plurality of non-self-fusing enamelled wires twisted together in an alternating arrangement is compressed into a predetermined shape. A group of enamelled wires characterized by: 2. The collective enamelled wire according to claim 1 of the utility model registration, which is formed by compression molding into a flat shape.