JPS601812A - Superconductive coil - Google Patents

Abstract

PURPOSE:To prevent easy movement in the axial direction of a superconductive wire by tapering the inner diameter of a spool for a layer winding circular superconducting coil bilaterally symmetrically. CONSTITUTION:Winding shaft sections 3'<4>, 4'<4> are formed in bilaterally symmetrical tapered structure. Consequently, when superconductive wires are wound by spools 4, the superconductive wires are brough close to the central surfaces of coils and wound tightly. As a result, there is no space in which the superconductive wires can move toward the central surfaces of the coils on conduction, and there is no normal conductive transfer of the coils with the movement of the superconductive wires. When currents are flowed through the coils wound on the spools 3, electromagnetic force works to the superconducting coils so as to be moved in the direction of the central surfaces of the coils. Since the winding shafts are thickened in the direction of the central surfaces of the coils, however, the superconductive wires can not move. Accordingly, there is no normal conductive transfer of the coils with the movement of the superconductive wires even in this case.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to the structure of a winding frame for a layer-wound circular coil.

[Prior Art and its Problems] Conventionally, a layer-wound circular coil is wound around a winding frame 1 having a U-shaped cross section, as shown in FIG. A radial electromagnetic force and an axial electromagnetic force act on the superconducting wire 2. The radial force is handled by the tension of the superconducting wire itself, but the axial force acts in the direction of gathering the superconducting wire toward the center plane of the coil. 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 present invention provides 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 providing the winding shaft portion 1' of the winding frame with a tapered structure.

[Embodiments of the Invention] Specific embodiments of the invention will be described based on the drawings. FIG. 2 and FIG. 3 show specific examples, and the winding shaft portion a#
, 4/jF K It has a symmetrical tenon structure.

When winding superconducting wire with the winding frame shown in Figure 2, the superconducting wire will be tightly wound close to the center plane of the coil. Therefore, there is no room for the superconducting wire to move toward the center plane of the coil during energization, and there is no normal conduction transition of the coil due to the movement of the superconducting wire.

Furthermore, when a current is passed through the coil wound around the winding frame shown in FIG. 3, an electromagnetic force acts on the superconducting wire to move it toward the center plane of the coil. However, since the winding axis is thick in the direction of the center plane of the coil, the superconducting wire cannot move, and in the end, there is no normal conduction transition of the coil due to the movement of the superconducting wire.

[Effects of the Invention] By carrying out the present invention, a coil that is difficult to undergo normal conduction transition can be easily obtained without increasing the manufacturing cost.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a winding frame of a conventional superconducting coil, and FIGS. 2 and 3 are cross-sectional views showing a winding frame of a superconducting coil according to an embodiment of the present invention. 3#, 4/I...Tapered winding shaft according to the present invention Patent attorney Kensuke Chika (and 1 other person)

Claims (1)

[Claims] A layer-wound circular superconducting coil characterized by having a symmetrical taper on the inner diameter of the winding frame.