JPH0529127A - Superconducting coil device - Google Patents

Abstract

PURPOSE:To eliminate nonuniformity of bearing distribution on a superconducting coil when introducing initial compressive force in a shaft direction. CONSTITUTION:A superconducting coil device is provided with edge plates 14, which clamp a super conducting coil 11 wound around a winding core 12, in the shaft direction of the winding core 12. A curved plane spacer 16 which has the curvature corresponding to the warpage when clamped by the edge plates 14 is inserted between the superconducting coil 11 and the edge plate 14, the internal stress of the superconducting coil when the initial compressive force is introduced in the shaft direction is uniformized and the loosening in the coil when electromagnetic force is operated is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil structure of a toroidal type superconducting coil device.

[0002]

2. Description of the Related Art The structure of a conventional toroidal type superconducting coil device is shown in FIG. As shown in FIG. 5, the toroidal superconducting coil device includes a superconducting coil 11 and a superconducting coil 1.
It comprises a winding core 12 for winding the wire 1, an outer peripheral reinforcing band 13 for tightening the superconducting coil 11 from the outside, an end plate 14 for tightening the superconducting coil 11 in the axial direction of the winding core 12, and a tightening bolt 15.

By the way, an electromagnetic force acts on the superconducting coil 11 when energized. This electromagnetic force is roughly classified into a radial direction (expansion force) and an axial direction. FIG. 4 shows the concept of the action of the electromagnetic force in the axial direction acting on the coil. This electromagnetic force 17 causes the compressive displacement 18 in the axial direction of the superconducting coil 11. When the axial compressive displacement 18 occurs in the superconducting coil 11, quenching (transition phenomenon from superconducting state to normal conducting state) occurs in the superconducting coil 11 due to internal frictional heat generation or heat generation by induced current.

Therefore, it is very important in designing and manufacturing the superconducting coil to suppress the displacement 18 of the superconducting coil 11 as small as possible. Therefore, in general, an end plate 14 is provided on the side surface of the superconducting coil 11, and the end plate 14 is provided.
Is pressed in the axial direction of the winding core 12 by the tightening bolt 15, so that the initial compression force is introduced.

[0005]

However, in the above-mentioned conventional structure, as shown in FIG. 6, the internal compression force 20 is unevenly distributed due to the bending of the end plate 14 due to the tightening force 19 (dotted line in the drawing). . Therefore, in a region where the initial compression internal force 20 is insufficient, the superconducting coil 11 is loosened when the electromagnetic force is applied, which causes quenching.

The present invention has been made in view of the above points, and provides a superconducting coil device capable of eliminating the non-uniformity of the surface pressure distribution at the time of introducing the axial initial compressive force in the superconducting coil. The purpose is to

[0007]

SUMMARY OF THE INVENTION The present invention is a superconducting coil device provided with an end plate member for tightening a superconducting coil wound around a winding core in the axial direction of the winding core, wherein the end plate member is tightened. A curved surface space having a curvature corresponding to the bending at the time.
By arranging the support member between the superconducting coil and the end plate member, the internal stress of the superconducting coil when the initial axial compressive force is introduced is made uniform, and the inside of the coil is loosened when the electromagnetic force acts. Is to prevent.

[0008]

The nonuniform distribution of the coil compression internal force in the conventional structure is caused by the bending deformation of the end plate member. In the present invention, the curved spacer member is inserted between the superconducting coil and the end plate member. By doing so, the internal compression force can be made uniform.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A superconducting coil device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front partial sectional view of a toroidal type superconducting coil device according to an embodiment of the present invention, and FIG. 2 is a side partial sectional view thereof. 1 and 2, the superconducting coil 11 wound around the core 12 and the core 12
Other than the end plate 14 for tightening in the axial direction, the tightening bolt 15 and the outer peripheral reinforcing band 13 are the same as those in the prior art. In the present invention, a point different from the conventional one is that the curved spacer 16 is provided.

That is, in this embodiment, when the initial compressive force in the axial direction is introduced into the superconducting coil 11 by tightening the end plate 14, the internal compression force 20 as shown in FIG. End plates 14 on both sides of the conductive coil 11
A curved surface spacer 16 is provided between each of the two.
The curved spacer 16 has a donut shape having a flat surface on the side in contact with the side surface of the superconducting coil 11 and an outwardly convex curved surface on the side in contact with the end plate 14. The shape dimension of this curved surface is obtained by a deformation analysis of the end plate 14 in consideration of the rigidity of the superconducting coil 11 and the rigidity of the end plate 14.

With this structure, even if the end plate 14 is bent by the tightening force 19 as shown in FIG. 3 (dotted line in the figure),
Since the end plate 14 contacts the curved surface of the curved spacer 16 on average, the compression internal force 20 can be made uniform as a result. Thereby, it is possible to prevent the occurrence of quench due to loosening of the superconducting coil 11.

[0013]

As described above, according to the present invention, between the superconducting coil and the end plate member as the axial compression introducing jig, there is a curved surface having a curvature corresponding to the bending when the end plate member is tightened. By inserting the spacer, the axial compression internal force introduced into the superconducting coil is made uniform, and the following effects are obtained. (1) Prevention of coil dielectric breakdown in the high surface pressure region. (2) Prevents quenching due to coil loosening when electromagnetic force acts in the low surface pressure region. Due to the above effect, the performance of the coil is significantly improved.

[Brief description of drawings]

FIG. 1 is a front view showing the configuration of a superconducting coil device according to an embodiment of the present invention.

FIG. 2 is a side view showing the configuration of the superconducting coil device of the same embodiment.

FIG. 3 is a diagram for explaining a distribution of a coil initial compression internal force in the embodiment.

FIG. 4 is a diagram for explaining an acting electromagnetic force in a toroidal superconducting coil.

FIG. 5 is a side view schematically showing the configuration of a conventional superconducting coil device.

FIG. 6 is a diagram for explaining a distribution of a conventional coil initial compression internal force.

[Explanation of symbols]

11 ... Superconducting coil, 12 ... Winding core, 13 ... Perimeter reinforcement band, 14 ... End plate, 15 ... Tightening bolt, 16 ... Curved space
S, 17 ... Electromagnetic force, 18 ... Axial compression displacement, 19 ... Tightening force, 20 ... Internal compression force.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihide Nakano 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Kobe Shipyard

Claims (1)

Claim: What is claimed is: 1. A superconducting coil wound around a winding core, an end plate member for tightening the superconducting coil in the axial direction of the winding core, and a flexure of the end plate member during tightening. And a curved spacer member disposed between the superconducting coil and the end plate member, the superconducting coil device having a curvature corresponding to.