JPS60217606A - Superconductive coil - Google Patents

Abstract

PURPOSE:To obtain a superconductive coil to generate small eddy current loss, etc. to be generated according to the change of a magnetic field, and moreover having a coil helium vessel of sufficient strength even at an extremely low temperature by a method wherein spacers are arranged on the periphery of a winding part formed by winding round circularly with a superconductive conductor, a glass fibrous body containing plastics is wound around the outside thereof, and the plastics is hardened. CONSTITUTION:Spacers 6 manufactured of FRP are arranged at the places of the plural number in the circumferential direction of a winding part 2, and thin plates 7 manufactured of FRP are arranged extending over the mutual spacers 6 thereof. The spacers 6 have notch parts 8 to serve both as paths and reservoir parts for bubbles of helium. A glass fiber tape 9 permeated with plastics of epoxy resin, etc. is wound around on the thin plates 7 arranged between the spacers 6 up to the prescribed thickness as to obtain sufficient strength, and is hardened to form a coil helium vessel 10. After then, patches are put on the flat parts on the outer periphery of the coil helium vessel 10, and dried making the parts thereof as not to be expanded to form a superconductive coil.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to superconducting coils, such as voloidal magnetic field coils for nuclear fusion devices.

[Technical background of the invention and its problems]

The voloidal magnetic field coil of a nuclear fusion device is a coil that maintains and controls the excited heating plasma of the plasma current.
Since this is a superconducting coil, a container (hereinafter referred to as a coil helium container) for storing liquid helium and the coil winding 4 is required. The voloidal magnetic field coil makes rapid changes in current when exciting plasma current. The current is also changed to maintain plasma balance. For this reason, if a coiled helium container is made of metal such as stainless steel, a very large eddy current will occur in the container, resulting in a huge loss of liquid helium and causing the coil to transition from a superconducting state to a normal conducting state. , the operation of the fusion device becomes impossible. Even if the superconducting state is to be maintained, the consumed amount of liquid helium must be immediately replenished, which requires a fairly large helium freezing and liquefaction device.

As described above, a coiled helium container cannot be made of metal because of the large eddy current loss. Therefore, FR of insulator
It is being considered that it will be made from P (fiber reinforced plastic). As shown in Figures 1 and 2, a coil winding part 2 is housed in a ring container 1 made of FRP and has a concave cross section.
A method has been considered in which the coiled helium container 4 is manufactured by layering the FRP upper cover 68 with epoxy resin or the like.
As mentioned above, the coiled helium container 4 is cooled to an extremely low temperature, liquid helium temperature of 4.2K, and heated up to room temperature through a so-called heat cycle, which causes a crack in the joint 5, and liquid helium and helium gas leak from that part. [Objective of the Invention] The object of the present invention is to provide a superconducting coil having a coil helium container that has little loss such as eddy current due to magnetic field fluctuations and has sufficient strength even under cryogenic liquid helium temperatures. It is to provide.

[Summary of the invention]

In order to achieve the above object, the superconducting coil of the present invention has the following features:
A spacer is placed around the winding part in which a super 6 conductive wire is wound in a ring, and a glass fiber body containing a synthetic resin is wound around the outside of this spacer, and the synthetic resin is hardened, and the coil helium container is made into an insulator. Create one piece by.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to No. 8@.

FRP spacers 6 are provided at multiple locations in the circumferential direction of the winding portion 2.
and FR between these spacers 6.
A thin plate 7 made of P is arranged. The spacer 6 has a notch 8 that also serves as a passage and reservoir for helium bubbles. A glass fiber tape 9 impregnated with a synthetic resin such as an epoxy resin is wound onto a thin plate 7 placed between the spacers 6 to a predetermined thickness sufficient for strength to form a coiled helium container 10.

Thereafter, a pad is applied to the flat part of the outer periphery of the coil helium container 10, and the superconducting coil is completed by air drying or heating drying while preventing this part from swelling.

2. The spacers 16 may be spaced narrowly so that the glass fiber tape 9 is directly wound without providing the thin plate 17. Moreover, a glass fiber string may be used instead of the glass fiber tape. Furthermore, the synthetic resin may be either liquid or semi-cured.

〔Effect of the invention〕

In the superconducting coil of the present invention, a spacer is attached to the coil winding part, and a glass fiber body containing synthetic resin is wound directly on the thin plate spanning the spacer to create a coiled helium container, which has no connecting part. This prevents helium loss and provides sufficient strength even at extremely low temperatures.

Further, since such a coiled helium container naturally has high electrical insulation, eddy current loss can be reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional superconducting coil, FIG. 2 is a cross-sectional view taken along the line -■ in FIG. 1, and FIG. 3 is a cutaway perspective view of a superconducting coil according to an embodiment of the present invention. 2... Winding portion, 6... Spacer, 9... Glass fiber tape. Agent Patent Attorney Rules Yu Yu (and 1 other person) Figure 1-ar Figure 2

Claims (1)

[Claims] A superconducting coil, characterized in that a spacer is arranged around a winding portion of a superconducting wire wound in the form of a lump, and a glass fiber body containing a synthetic resin is wrapped around the outside of the spacer, and the synthetic resin is cured. .