JPH06176632A - Superconductor - Google Patents

Abstract

PURPOSE:To reduce A.C. loss, and prevent the increase of the quenching phenomena of superconductive wire material and the cooling load to realize an effective superconductive coil system. CONSTITUTION:A stabilizing member 10, provided contactedly with superconductive wire material 1, is sectioned into small rectangular states, and the surface of the stabilizing member 10 is covered by material 11 having relatively electric resistance. Consequently, A.C. loss for a magnetic component even in any direction can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting conductor for forming a superconducting coil or the like.

[0002]

2. Description of the Related Art When a large current is applied to a superconducting wire in a superconducting state and the temperature of the superconducting wire rises for some reason, the superconducting state may shift to a normal conducting state. This phenomenon is called quench.

When quenching occurs, Joule heat is generated at that portion and the superconducting wire may be damaged. In order to prevent such damage, by attaching a stabilizing member made of a good conductor such as pure aluminum to the superconducting wire, if a quench occurs in part of the superconducting wire,
There is a means for bypassing the current by the stabilizing member.

FIG. 2 is a sectional view of a superconducting conductor having such a structure. As shown in the figure, the superconducting conductor 1 is surrounded by a structural member 2, the outer side of which is covered with an insulating member 3, and a stabilizing member 5 is arranged on the superconducting wire 1. In the case of using the integrated stabilizing member 5 as described above, when the superconducting conductor is used in a rapid magnetic field changing state, an induced current is generated in the stabilizing member 5 and the AC loss increases. As a measure for suppressing this increase in AC loss, multilayering of the stabilizing member 5 is considered.

FIG. 3 is a sectional view showing an example thereof. Figure 3
The stabilizing member 5 is divided into a plurality of layers to form a multilayer stabilizing member 6, as shown in FIG.
i, etc. are covered. However, the configuration as shown in FIG. 3 has a drawback that the AC loss for the magnetic field component in the X direction is reduced, but the AC loss for the magnetic field component in the Y direction is not reduced.

[0006]

As described above, the structure shown in FIG. 3 is effective in reducing the AC loss with respect to the magnetic field component in the X direction among the magnetic field changes experienced by the superconducting conductor. There is no reduction effect on the magnetic field component in the Y direction. As a result, AC loss (Joule heat generation) increases,
There is a problem that the quenching phenomenon of the superconducting wire increases and the load on the cooling system becomes excessive and the efficiency of the superconducting coil system decreases.

The present invention can reduce the AC loss with respect to the magnetic field component in any direction, does not cause the quench phenomenon of the superconducting wire, and does not cause an increase in cooling load, and is efficient. It is to provide a superconducting conductor that can realize a superconducting coil system.

[0008]

In order to solve the above-mentioned problems and to achieve the object, the present invention provides a stabilizing member provided in contact with a superconducting wire in the form of a small rectangle, and its surface. To be covered with a material having a relatively high electric resistance.

[0009]

As a result of taking the above-mentioned means, the following effects occur. Since the stabilizing member is divided into small rectangular shapes, when the superconducting conductor is used in a fluctuating magnetic field, both of the X-direction and Y-direction components of the magnetic field component to be experienced are experienced. AC loss can be reduced.

[0010]

1 is a sectional view showing the structure of a superconducting conductor according to an embodiment of the present invention. As shown in FIG. 1, the superconducting wire 1 of this embodiment is surrounded by a structural member 2 having a U-shaped cross section, and the outside of the structural member 2 is covered with an insulating member 3. A stabilizing member 10 is provided inside the structural member 2 so as to contact the superconducting wire 1. The stabilizing member 10 is divided into small rectangular shapes so that the cross-sectional area of the superconducting conductor in the direction perpendicular to the plane of FIG. The stabilizing member 10 is made of a good conductor such as pure aluminum, and the surface thereof is coated with an insulating coating 11 (including coating) using a material having a relatively high electric resistance, for example, CuNi. ing. This includes oxide films and the like.

The superconducting conductor of this embodiment has a stabilizing member 10.
Are arranged in a small rectangular shape, so that when the superconducting conductor is used in a fluctuating magnetic field, the stabilizing member 10 can be applied to both magnetic field components in the X direction and the Y direction.
It is possible to prevent the quench phenomenon of the superconducting wire rod 1 from occurring due to the AC loss (Joule heat generation) generated therein. Further, since it also contributes to reducing the load on the cooling system, the efficiency of the superconducting coil system can be improved. The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0012]

According to the present invention, since the stabilizing member provided in contact with the superconducting wire is divided into small rectangular shapes, it is possible to reduce the AC loss with respect to the magnetic field component in any direction. There is no risk of quenching the superconducting wire, and it does not increase the cooling load.
A superconducting conductor capable of realizing an efficient superconducting coil system can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a superconducting conductor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional superconducting conductor.

FIG. 3 is a cross-sectional view of an example of a conventional superconducting conductor in which a stabilizing member is multilayered.

[Explanation of Codes] 1 ... Superconducting wire 2 ... Structural member 3 Insulating member 10 Stabilizing member 11 Insulating coating

Claims (1)

[Claims] 1. A stabilizing member provided in contact with a superconducting wire is divided into small rectangular shapes, and the surface thereof is
A superconducting conductor characterized by being covered with a material having a relatively high electric resistance.