JPS6215804A - Superconductive flat-molded stranded wire - Google Patents

Abstract

PURPOSE:To obtain an insulating layer, in which refrigerant can flow without imparing respective functions, by functionally applying two pieces of insulating tapes for electric insulation and molding bonding, which are wound around the outer surface of a superconductive flat-molded stranded wire. CONSTITUTION:As an insulating tape of a superconductive rectangular molded stranded wire 2, an organic synthesized film 4 is wound for electric insulation. A thermosetting synthetic resin undergoes prepreg treatment under a B stage on only one side of a film for coil molding bonding, and an organic synthesized film 5 is obtained. The film 5 is wound on the outside of the organic synthesized film 4 in a spiral shape. Thereafter, heat treatment is performed, and then pressure is applied. A gap is formed as a cooling path by the spirally wound organic synthesized film 5. A refrigerant readily flows in the superconductive rectangular molded stranded wire. Since the organic synthesized film 4 is not treated, liquid helium and the like used as the refrigerant readily penetrate in the inside of the stranded wire. Since the superconductor wires 1 is directly cooled, the superconductor coil having stable characteristics can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to superconducting coils, and more particularly to insulation suitable for superconducting rectangular shaped stranded wires.

[Background of the invention]

As an insulation for superconducting rectangular shaped stranded wires, for example, JP-A-58
As shown in Japanese Patent No. 105-105, a method is known in which a synthetic resin adhesive is applied to one side of an organic synthetic film, this applied side is wound around the outside of the wire, and after winding, heating and pressure are applied.

According to this method, sufficient adhesion is obtained between the coil-forming special insulating tapes, so the coil shape is reliably maintained until it is assembled into the magnet structure. is obstructed by the insulating tape integrated with synthetic resin.

[Purpose of the invention]

An object of the present invention is to provide wire insulation that allows a coolant to flow through the internal voids of a superconducting rectangular shaped stranded wire.

[Summary of the invention]

The present invention has the effect of obtaining an insulating layer through which a refrigerant can flow without impeding each function by separately applying insulating tapes wrapped around the outer circumference of superconducting rectangular shaped stranded wires for electrical insulation and for forming adhesion. There is.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

As the field of application of superconducting electromagnets expands, electromagnets that require high excitation speeds or pulse operation are also becoming superconducting.

Because the conductor of such a superconducting electromagnet coil has a problem of alternating current loss due to its excitation properties, superconducting rectangular shaped stranded wire is generally used.

FIG. 2 shows a perspective view of a superconducting rectangular shaped strand. A plurality of superconducting wires 1 in which superconducting wires are pressed into a stabilizing base material are twisted together and then formed into a rectangular shape to form a superconducting rectangular stranded wire 2.

In the superconducting rectangular shaped stranded wire 2 formed in this way, gaps 3 exist between adjacent superconducting wires 1.

In order to maintain stable superconducting properties, it is necessary that a coolant circulate through the voids 3 as well.

Due to its structure, the superconducting rectangular shaped stranded wire 2 has a disadvantage that its rigidity as a conductor is low, and if it is removed from the coil form after being wound on a coil form, it is difficult to maintain a predetermined shape and dimensions.

As a way to compensate for this drawback, one side of an organic synthetic film is coated with a synthetic resin and treated with prepreg as an insulating tape to be wrapped around superconducting rectangular shaped stranded wires.

Wind the wire so that the treated surface is on the outside, and after winding the coil,
It is known to firmly bond insulating tapes together by applying heat and pressure.

Since the outer periphery of the superconducting rectangular shaped stranded wire of the coil thus obtained is uniformly covered with a cured synthetic resin, it becomes difficult for the refrigerant to flow into the void 3 even if the coil is immersed in the refrigerant.
Because the partial heat generation of the superconducting alloy is incompletely cooled, the superconducting properties become unstable.

The insulation of superconducting rectangular shaped strands according to the invention is shown in FIG.

An organic synthetic film 4 is wrapped around the superconducting rectangular shaped stranded wire 2 as an insulating tape to provide electrical insulation.

Here, the organic synthetic film 4 is not treated with a resin for adhesion. On the outside of the organic synthetic film 4, an organic synthetic film 5 prepared by prepreg-processing a thermosetting synthetic resin in a B-stage state is further wound spirally on one side for coil forming adhesion, with the synthetic resin layer on the outside of the wire. be.

After the insulated superconducting rectangular shaped twisted strands 111A2 are wound in a coil shape in an aligned manner and then heated and pressurized, each adjacent turn is formed by a thermosetting layer coated on the surface of the organic synthetic film 5 on the surface where the organic synthetic films 5 overlap each other. If the helical winding pitch of Shape 5 is less than twice the width of the film tape, the non-wrapped surface of the film will form a cooling passage, and the refrigerant will be easily absorbed. It flows between two superconducting rectangular shaped strands. Since the organic synthetic film is not treated, liquid helium or the like used as a refrigerant easily penetrates into the inside of the superconducting rectangular shaped stranded wire through the overlaps of the film 4. Thereby, the superconducting wire 1 is cooled by direct contact with the refrigerant, so that a superconducting coil with stable characteristics can be obtained.

〔Effect of the invention〕

According to the present invention, since it is possible for a coolant to flow through the internal voids of the superconducting rectangular shaped stranded wire, it is possible to obtain a superconducting coil with stable characteristics.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an insulated superconducting rectangular shaped stranded wire according to an embodiment of the present invention, and FIG. 2 is a perspective view of the superconducting rectangular shaped stranded wire before insulation. 1... Superconducting wire, 2... Superconducting rectangular shaped stranded wire, 3...
... Void, 4... Organic synthetic film, 5... Thermosetting synthetic resin prepreg treated organic synthetic film.

Claims (1)

[Claims] 1. Wrap insulating tape around the outer circumference of the superconducting rectangular shaped stranded wire,
In the superconducting coil that is aligned and wound on a coil former, heated and pressurized to maintain a predetermined size and shape, and then incorporated into an electromagnetic structure, an organic synthetic film is wound inside as the insulating tape, and then A superconductor characterized in that an organic synthetic film prepreg-treated with a thermosetting synthetic resin on only one side in a B-stage state is wound spirally with insulation tapes spaced apart from each other with the synthetic resin layer on the outside of the wire. Flat shaped stranded wire.