JPS601811A - Superconductive coil - Google Patents

Abstract

PURPOSE:To prevent easy movement in the axial direction of a superconductive wire by taperng the inner diameters of mutual spools of a pair of layer winding circular superconducting coils receiving mutually attractive or repulsive electromagnetic force and facing tapers each other. CONSTITUTION:Winding shaft sections 3'<4>, 4'<4> are formed in tapered structure. Consequently, when superconducting wires are wound so that mutual coils attract by spools 3, the superconducting wires are brought close to flanges 3' and wound tightly. As a result, there is no space in which the superconductive wires can move toward the flanges 3' on conduction, and there is no normal conductive transfer of coils with the movement of the superconductive wires. When currents in the direction of currents in which the wound coils are repulsed are flowed, electromagnetic force works to the superconducting wires so as to be moved in the directions of the flanges 3''. Since winding shafts are thickened in the direction of the flanges 3'', however, the superconducting wires can not move. Accordingly, there is no normal conductive transfer of the coils with the movement of the superconducting wires even in this case. There are no movement in the axial direction of the superconducting wires and normal conductive transfer with the movement of the wires even on the attraction of mutual coils and on their repulsion in the same manner as the spools 3 in spools 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a circular superconducting coil, ie, a split coil, which receives a pair of electromagnetic forces that attract or repel each other.

[Prior art and its problems] Conventionally, a split coil has been wound around a winding frame l having a double-shaped cross section, as shown in FIG. A radial electromagnetic force and an axial electromagnetic force act on the superconducting wire 2. The force in the radial direction is handled by the tension of the superconducting wire itself, but the force in the axial direction is absorbed by the superconducting wire at the flange 1' (when the coils are attracted to each other).
Or try to wash the flange 1' (if the coils repel each other). For this reason, the superconducting wire may move in the axial direction, and the accompanying heat may cause the superconducting wire to transition to normal conductivity.

[Object of the Invention] The object of the present invention is to provide a coil structure that makes it difficult for a superconducting wire to move in the axial direction.

[Summary of the Invention] The object of the present invention is achieved by forming the winding shaft portion l# of the winding frame into a tapered structure.

[Embodiments of the Invention] Specific embodiments of the invention will be explained with reference to the drawings. FIG. 2 and FIG. 3 show specific examples, and each of the winding shaft portion 3#
, 4# has a tapered structure. When winding superconducting wire in a case where the coils attract each other with the winding frame shown in Figure 2, the superconducting wire will be tightly wound close to the flange. Become. Therefore, there is no room for the superconducting wire to move toward the flange 3' during energization, and there is no normal conduction transition of the coil due to the movement of the superconducting wire.

In addition, if a current is passed in a direction that causes repulsion in the coil wound around the winding frame shown in Figure 2, the flange 3"
Electromagnetic force acts to move in the direction.

However, since the winding shaft is thick in the direction of the flange 3', the superconducting wire cannot move, and in this case as well, there is no normal conduction transition of the coil due to the movement of the superconducting wire.

In the case of the winding frame shown in Fig. 3, as in the case of the winding frame shown in Fig. 2, there is no axial movement of the superconducting wire and the accompanying transition to normal conductivity, whether the coils attract or repel each other. Effects of the Invention] By carrying out the present invention, a split coil that is difficult to undergo normal conduction transition can be easily obtained without increasing the manufacturing cost.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a winding frame of a superconducting coil showing a conventional example, and FIGS. 2 and 3 are cross-sectional views of a winding frame of a superconducting coil showing an embodiment of the present invention.

Claims (1)

[Claims] A superconducting coil characterized in that a pair of layer-wound circular superconducting coils are subjected to electromagnetic forces that attract or repel each other, and the inner diameters of the respective winding frames are tapered so that the tapers face each other.