JPS637663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconductor, and particularly to a superconductor employed in a superconducting coil of a nuclear fusion device or the like.

Generally, toroidal magnetic field coils of nuclear fusion devices, etc.
A large-capacity superconducting conductor consists of a superconducting wire that enables the original conduction of electricity in a superconducting state at cryogenic temperatures, and a stabilizing material, which is used to control the electromagnetic force of the superconducting wire and the resistance between the cryogenic and normal conductivity ranges. It consists of a conductor that serves to commutate and stabilize the stabilizing element to this stabilizing material (a conductor usually made of hard copper wire).

When manufacturing a large-sized superconducting coil using a superconducting conductor having such a configuration, the length of the superconducting strands is usually limited in terms of manufacturing, so the connection must be made midway through the winding.

Conventionally, these superconducting wires have been connected by overlapping the sides of the superconducting wires over a relatively long distance, or by joining the connecting ends of the superconducting wires by brazing, etc. Ta. However, in the former case, the dimensions of the superconducting strands must be increased at the connection portion, and sufficient mechanical strength cannot be obtained. Furthermore, the latter had the disadvantage of high electrical resistance. In particular, increasing the dimensions of superconducting strands imposes restrictions on the structure of devices, and increasing electrical resistance directly leads to increased loss and consumption of cooling medium (liquid helium). This increases not only the operating cost of the equipment but also the loss of the low loss characteristic of superconductivity.

The present invention has been made in view of the above-mentioned points, and its purpose is to provide a superconductor that can reduce the electrical resistance value to a very small value without increasing the dimensions of the superconducting wire. There is something to do.

The present invention provides a superconducting body formed by overlapping a plurality of superconducting strands that are butted at at least one place, by shifting the abutting portions of the adjacent superconducting strands from each other, and abutting the adjacent superconducting strands. The intended purpose is achieved by forming wrapping parts between the parts.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

An embodiment of the superconducting conductor 1 of the present invention is shown in FIGS. 1, 2, and 3.

As shown in the figure, since there is a manufacturing limit to the length of the superconducting wire 2 in the superconducting conductor 1, the superconducting wire 2 is usually split at at least one point in the middle, and the ends of the split portions are joined together. The butt portions 3 are formed, and a plurality of superconducting strands 2 (in the example, 5
They are stacked and arranged in parallel, and their surroundings are covered with a stabilizing material (usually hard copper wire) 4 to stabilize the superconducting state. In this embodiment, the abutting portions 3 of the superconducting strands 2 adjacent to each other in the overlapping direction are shifted in the axial direction, and the abutting portions 3 of the superconducting strands 2 that are adjacent to each other are shifted in stages. It is formed from a wrapping part between three parts (see Fig. 1). Furthermore, the butt portions 3 of the superconducting wires 2 arranged in parallel are located at the same position (see FIG. 3).

By having the configuration of this embodiment as described above,
By shifting the abutting portions 3 of phase-adjacent superconducting strands 2, a wrapping portion is formed between the abutting portions 3 of phase-adjacent superconducting strands 2 of each superconducting strand 2, so that the current As shown in Fig. 4, the current flows through the wrapping portion between each superconducting strand 2, so that the current moves between the superconducting strands 2 over a very wide area, and the electrical resistance value becomes very small. I know that there is.
Furthermore, in this embodiment, since the butt portions 3 of the superconducting wires 2 are not overlapped, the dimensions of the superconducting wires do not increase (this can be seen in FIG. 1). This can also be seen from the fact that there is no change in the dimensions of the superconducting wire 2). It goes without saying that the mechanical strength of the superconducting strands 2 can be sufficiently increased by applying brazing or the like to the joints between the stabilizing members 3.

Other embodiments of the present invention are shown in FIGS. 5 and 6.

The embodiment shown in the figure has a cooling medium flow path 5a inside.
The superconductor 1 is formed by winding the superconducting wires 2 around the stabilizing material 5 having
The superconducting strands 2 are wound in a staggered manner to form a wrapping portion between the abutting portions 3 of adjacent superconducting strands 2.

Even with this configuration of this embodiment, the effect is exactly the same as that of the embodiment described above.

According to the superconducting body of the present invention described above, in the superconducting body formed by stacking a plurality of superconducting strands abutted at at least one place, the abutting portions of the adjacent superconducting strands are shifted from each other, Since a wrapping part is formed between the abutting parts of adjacent superconducting strands, the joining parts of one superconducting strand will not overlap, so the size will not increase. Instead, current flows through the wrapping part formed at the butt part between adjacent superconducting strands, and the electrical resistance value can be extremely small, making it effective when used in this kind of superconducting conductor. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the superconductor of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a sectional view of FIG. 2, and FIG. 4 is a sectional view of the superconductor of the present invention. FIG. 5 is a diagram showing another embodiment of the present invention and corresponds to FIG. 2, and FIG. 6 is a front view of FIG. 5. 1... superconducting conductor, 2... superconducting wire, 3...
Butt part, 4, 5... Stabilizing material.

Claims (1)

[Scope of Claims] 1. In a superconductor formed by stacking a plurality of superconducting strands abutted at at least one place, the abutting portions of the adjacent superconducting strands are shifted from each other, and the adjacent superconducting strands are stacked together. A superconductor characterized in that a wrapping portion is formed between abutting portions of comrades. 2. The superconducting strands are in a state where they are stacked one on top of the other,
A superconducting conductor according to claim 1, wherein the superconducting conductor is surrounded by a stabilizing material. 3. The superconducting conductor according to claim 1, wherein the superconducting wire is wound around a stabilizing material having a cooling medium flow path through which a cooling medium passes.