JPS59138007A - Superconductive conductor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a superconducting conductor comprising a core material and superconducting strands disposed around the core material.

Description of the Prior Art Generally, the high current capacity superconducting conductor used in a superconducting 7-net is a stranded conductor as shown in FIG. FIG. 2 is a sectional view of the superelectric SS body shown in FIG. 1. As illustrated, the superconducting conductor 1 has a plurality of superconducting strands 2. Further, the core material 3 is used as a twisted core when manufacturing a conductor, and as a reinforcing material against the generation of 1111 tension during application of winding tension or excitation during manufacturing of a coil. This core material 3 is made from a high tensile strength material such as S IJ S.

The superconducting conductor 1 having such a configuration has the following drawbacks. This will be explained using FIGS. 3 and 4.

Figure 3 shows superconducting 7 wires 1 to 1 wrapped around superconducting conductor 1.
is a cross-sectional view showing lines of magnetic force with arrows. FIG. 4 is an enlarged view showing the relationship between the superconducting conductor 1 located at the end of the magnet shown in FIG. 3 and the lines of magnetic force. As shown in the figure, at the end of the magnet, the radial component of the magnetic field lines, that is, the component in the L right direction in FIG. is wound flatwise as shown in Figure 3 (2).

Therefore, in the conductor located at the end of the magnet, the lines of magnetic force are approximately perpendicular to the flange 1 plane of the core material 3 of the conductor 1, as shown in FIG.

Therefore, when the magnetic field suddenly changes in the pulsed magnet, a large eddy current loss occurs in the core material 3.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a superconducting conductor that can significantly reduce the generated eddy current even if it is placed at the end of a superconducting magnet.

This invention is a superconducting conductor that is characterized by having holes in its core material, and the presence of these holes makes it possible to significantly reduce the generated eddy current.

DESCRIPTION OF EMBODIMENTS FIG. 5 is a perspective view showing a core material used in a superconducting conductor according to the present invention. Although not shown, superconducting strands are arranged as twisted wires around this core material 3 to constitute a superconducting conductor, similar to that shown in FIG. As shown in the figure, the core material 3 is provided with a slit 4 that penetrates the core material 3 by SΩ. The width of the slit 4 is preferably made as narrow as possible so that the core material 3 can maintain its strength. Further, the length, position, frequency, etc. of the slits 4 are similarly appropriately determined within a range that does not impair the function of the core material 3 as a tensile strength member as much as possible.

Due to the presence of this slit 4, even if an eddy current occurs on the flat surface of the core material 3, a large eddy current loop is cut off.

In FIG. 5, the slit 4 is formed to extend substantially parallel to the length direction of the core material 3, that is, the direction in which the surrounding superconducting strands extend. However, since the slit is provided to cut the eddy current loop, the slit may be formed extending in a different direction, for example, in a direction intersecting the length direction of the core material 3, or the slit may have the same meaning. Therefore, what is provided in the core material 3 is not limited to a long slit, but may be a through hole that is not included in the concept of a slit. However, no matter what shape the hole is made or in what direction it extends, as mentioned above, it must be determined within a range that does not impair the function of the core material 3 as a tensile strength member as much as possible. .

Effects of the Invention As mentioned above, the superconducting conductor according to the present invention has holes in its core material. Therefore, due to the presence of this hole, a large eddy current loop is cut, so that the eddy currents generated are very small. Therefore, eddy current loss at the ends of the superconducting magnet can be significantly suppressed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional superconducting S conductor, and FIG. 2 is a sectional view thereof. FIG. 3 is a cross-sectional view showing a superconducting magnet wound with a superconducting conductor, and lines of magnetic force are indicated by arrows. FIG. 4 is an enlarged view showing the relationship between the superconducting conductor located at the end of the superconducting magnet shown in FIG. 3 and lines of magnetic force. FIG. 5 is a perspective view showing a core material of a superconducting conductor according to the present invention. In the figure, 1 is a superconducting conductor, 2 is a superconducting strand,
3 indicates a core material, and 4 indicates a slit.

Claims (2)

[Claims] (1) A superconducting conductor consisting of a core material and superconducting strands arranged around the core material, characterized in that the core material is provided with a hole. (2) The superconducting conductor according to claim 1, wherein the hole is an elongated slit.