JPH0638368B2 - Superconducting coil - Google Patents

Description

TECHNICAL FIELD The present invention relates to a large-capacity superconducting coil used for nuclear fusion, power storage, and the like.

[Conventional technology]

FIG. 4 is a perspective view of an insulated conductor used in a conventional superconducting coil disclosed in, for example, Japanese Patent Application Laid-Open No. 59-29404, in which (1) is a superconducting wire and (2) is a superconducting wire (1 ), An insulating material wound around the superconducting wire (1) and the insulating material (2), and (4) is open to the surface of the superconducting wire (1). It is a cooling passage.

Next, the operation will be described. An insulating spacer (3) is wound around the surface of the superconducting wire (1), and an insulating sheet (2) is further wound around this. When this superconducting wire (1) is wound into a coil and immersed in a refrigerant (generally, liquid helium at a temperature of 4.2K), the refrigerant cools the surface of the superconducting wire (1) through a cooling passage (4). , The superconducting state is maintained.

[Problems to be solved by the invention]

Since the conventional superconducting coil has the insulating spacer (3) and the insulating material (2) wound around the surface of the superconducting wire (1) as described above,
When the heat treatment temperature of the superconducting wire reaches a high temperature such as the compound superconducting wire (1) and the function of the insulating material (2) is deteriorated, or when the strain is applied after the heat treatment, the superconducting property is significantly deteriorated. Had a problem that special treatment was required to provide the insulating material (2) and the cooling passage (4), workability was poor, and the manufacturing cost was high.

The present invention has been made to solve the above problems, and to obtain a superconducting coil that can perform electrical insulation without giving harmful strain to a superconducting wire and can manufacture a necessary cooling passage at low cost. With the goal.

[Means for solving problems]

A superconducting coil according to the present invention comprises an insulating spacer wound around a reinforcing base material with a gap, and a reinforcing material composed of these is combined with a plurality of superconducting wires so that the reinforcing material is on the outer diameter side. It was wound with.

[Action]

Instead of one superconducting wire in the present invention, a plurality of superconducting wires are used so as to have the same cross-sectional area as that of the superconducting wire so as to have low rigidity and prevent harmful strain during winding. Furthermore, since the conductive wire can be wound together with the reinforcing material while giving a predetermined tension, it is not necessary to apply tension to the superconducting wire, and it is possible to prevent the superconducting wire from receiving harmful strain during winding. However, the superconducting wire can be firmly wound. Further, the reinforcing material 26 firmly supports the electromagnetic force generated when the wound superconducting wire is energized from the outer diameter side of the superconducting wire. The gap between the insulating spacers wound around the reinforcing base material forms a refrigerant passage for the superconducting wire.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, (21) is a superconducting wire comprising a compound superconducting material N _b3 S _n or the like produced formed by heat treatment, (22) reinforcing base material such as stainless steel, for example, (23) reinforcing substrate (22) Insulation material made by wrapping Kapton tape in half, (24) is an insulation spacer wound around the insulation material (23) with a gap, and (25) is a cooling created by the gap of the insulation spacer (24). The passages (26) are reinforcing members formed by insulating these.

A method of winding the superconducting wire (21) and the reinforcing material (26) having the structure shown in FIG. 1 will be described. In Fig. 2, (31) is a superconducting wire.
(21) Superconducting wire winding drum that supplies (21), (32) Reinforcement material (26)
And a coil bobbin (33) for winding the superconducting wire (21) and the reinforcing material (26). FIG. 3 is an explanatory view of a superconducting coil manufactured by the above coil winding. (41) is a coil interlayer spacer.

First, a composite material made of copper, niobium, a copper-tin alloy or the like before heat treatment is wound around a superconducting wire winding drum (31) and subjected to a predetermined heat treatment. The result is a compound-based superconducting wire (2
1). Next, in order to strengthen the coil winding against electromagnetic force, for example, a polyimide film tape which is very thin with respect to the plate thickness of the reinforcing base material (22) is provided on the surface of the reinforcing base material (22) made of stainless steel, for example. It is the insulating material (23) that makes a 1/2 turn winding and electrically insulates between the coil turns. Further, a space is formed on this surface, and for example, an aramid paper tape or the like is spirally wound to form an insulating spacer (24). The insulating spacer (24) forms a cooling passage (25) through which liquid helium passes between the superconducting wire (21) and the reinforcing material (26). When the coil winding is performed as shown in Fig. 2 by using the above, the superconducting wire (21) is configured so that a plurality of superconducting wires have the same sectional area instead of using one superconducting wire in order to reduce rigidity. The tension is not applied to the superconducting wire (21)
Superconducting wire winding drum (31) and reinforcing material winding drum together with superconducting wire (21) while applying a predetermined tension T to (26).
By winding from (32) around the coil bobbin (33),
Since the superconducting wire (21) is tightly wound around the coil bobbin (33) without being subjected to harmful distortion, it is possible to manufacture a superconducting coil with little deterioration in superconducting characteristics.

Further, the coil manufactured as described above is an electrically safe coil because the function of the insulating material is sufficiently retained. As described above, the insulation treatment and the taping for the cooling passage in the present invention can be applied to the reinforcing material (26) alone.
As a result, the insulating tape does not have to be a highly heat-resistant inorganic material, and a conventional organic material having good workability can be used. Furthermore, when the superconducting wire (21) after the heat treatment is wound in a coil shape, the step of deteriorating the superconducting characteristics and the complicated steps of electrical insulation and cooling passage construction are unnecessary.

In addition, although the compound-based superconducting wire (21) has been shown in the above-mentioned examples, an alloy-based superconducting wire (21) such as niobium titanium may be used.

Further, although the stranded superconducting wire (21) is illustrated in the above embodiment, it may be a monolithic superconducting wire (21).

Further, although the insulating material (23) is used in the above embodiment, it may be omitted if the refrigerant and the insulating spacer (24) function as an electric insulating material.

Further, although the pancake winding type superconducting coil is shown in FIG. 3 of the embodiment, other winding type may be used.

〔The invention's effect〕

As described above, according to the present invention, an insulating spacer is wound around a reinforcing base material with a gap therebetween, and the gap is used as a cooling passage, and a plurality of reinforcing members formed such that the reinforcing member is on the outer diameter side. Since it is wound in combination with the superconducting wire of
It can firmly support the electromagnetic force generated when energized,
Since the reinforcing material and the superconducting wire are combined and wound, the superconducting wire can be firmly wound without causing harmful strain, and a strong superconducting coil having excellent superconducting characteristics can be obtained. Of course, the superconducting wire is efficiently cooled by the refrigerant passage formed by the gap between the insulating spacers wound around the reinforcing material, and the stability of the superconducting characteristics is improved also from this point.

[Brief description of drawings]

FIG. 1 is a perspective view of a superconducting coil according to an embodiment of the present invention, FIG. 2 is a conceptual diagram for explaining a winding method according to the present invention, and FIG. 3 shows an embodiment of a superconducting coil according to the present invention. FIG. 4 is a perspective view showing a conventional superconducting coil. In the figure, (21) is a superconducting wire, (22) is a reinforcing base material, (24) is an insulating spacer, (25) is a cooling passage, and (26) is a reinforcing material. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-59-90905 (JP, A) JP-A-55-76598 (JP, A) JP-A-55-163812 (JP, A) JP-A 52- 53692 (JP, A) Actually opened 58-120614 (JP, U) Actually opened 58-120613 (JP, U)

Claims (2)

[Claims] 1. A reinforcing material having a reinforcing base material and an insulating spacer wound in a linear shape at intervals so as to form a coolant channel on the reinforcing base material, and a plurality of superconducting wires. A superconducting coil in which a reinforcing material is combined and wound so as to be on the outer diameter side of the plurality of superconducting wires. 2. The superconducting coil according to claim 1, wherein the reinforcing base material is insulated.