JPH05217431A - Superconducting molded twisted wire - Google Patents

Abstract

PURPOSE:To reduce an eddy current which flows across element wires and at the same time maintain rigidity of twisted wires. CONSTITUTION:In a superconducting molded twisted wire made by fixing a plurality of superconducting element wires 1 with half-hardened resin 3 to each other, an oxide film 2 is formed on the surface of the superconducting element wires. Thereby, a superconducting molded twisted wire with a low eddy current loss, high rigidity and high residual resistance ratio can be obtained.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a superconducting molded stranded wire,
In particular, it has low eddy current loss and high rigidity, and has a higher residual resistance ratio.

[0002]

2. Description of the Related Art Conventionally, a superconducting molded stranded wire used in an environment where the external magnetic field fluctuation speed is large is a post-formed stranded wire in which the surface of the wire is insulated in order to reduce eddy currents flowing between the wires due to induced electromotive force. Often processed. On the other hand, the formed stranded wire is often required to have rigidity after being processed.Therefore, in order to reduce the eddy current and increase the rigidity, the strand is coated with a semi-cured resin, and then the formed stranded wire is processed. A method of curing the entire formed stranded wire by performing cure is used.

[0003]

In the superconducting molded stranded wire having such a structure, the semi-cured resin flows in the direction of low pressure during the processing of the molded stranded wire, so that a part of the resin film is cut off. The superconducting element wires come into contact with each other due to the formation of a portion, and there is a drawback that the eddy current loss in that portion increases.

[0004]

As a result of various studies in view of this, the present invention has developed a superconducting molded stranded wire having a low eddy current loss, a high rigidity and a high residual resistance ratio.

That is, the present invention is a superconducting molded stranded wire in which a plurality of superconducting element wires are fixed to each other with a semi-cured resin, and an oxide film is formed on the surface of the superconducting element wires. .

[0006]

The present invention is one in which an oxide film is formed on the surface of a superconducting wire as shown in the upper cut, and a plurality of semi-cured resin coated films are twisted together. Even if the resin flows to a lower pressure and a part of the resin film is broken as in the conventional case, the eddy current loss can be reduced because the wires are insulated by the oxide film.

It is effective to form the oxide film by blackening treatment. Since this blackening treatment is performed at a low temperature near 100 ° C., it is processed into a molded stranded wire without impairing the advantage of using a semi-cured resin film, that is, ensuring a high residual resistance ratio by curing after low-temperature twisting. It becomes possible to do.

[0008]

EXAMPLES Examples of the present invention will be described below. Figure 1
As shown in Fig. 5, the superconducting wire (1) with a diameter of 0.59 mm is blackened at a processing temperature of 80 ° C to form an oxide film (2) with a thickness of 1 µm on the surface of the wire (1). A semi-cured resin was applied on the above at 110 ° C. to form a semi-cured resin coating layer (3) having a thickness of 10 μm to form a strand.

As shown in FIG. 2, 16 strands of these strands were twisted together to form a molded stranded wire having a width of 4.9 mm and a thickness of 1.2 mm, and then cured at 150 ° C. for 1 hour to form a superconducting molded stranded wire. . This superconducting molded stranded wire had a small eddy current loss, a high residual resistance ratio of 150, and a high rigidity.

Although the primary molded stranded wire as shown in FIG. 2 has been described above, the present invention is a molded stranded wire in which a plurality of primary molded stranded wires in which a large number of strands are previously stranded are further stranded. Also has the same effect as the above case.

[0011]

As described above, according to the present invention, the superconducting element wire having the oxide film formed by the blackening treatment is coated with a semi-cured resin to form a strand, and a plurality of superconducting molded twisted wires are twisted together. Has a low eddy current loss, high rigidity, and further has a high residual resistance ratio, which is an industrially significant effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a strand according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Superconducting element wire 2 Oxide film 3 Semi-cured resin coating layer

Claims (1)

[Claims] 1. A superconducting molded stranded wire comprising a plurality of superconducting element wires fixed to each other with a semi-cured resin, wherein an oxide film is formed on the surface of the superconducting element wire.