JPH11144941A - Superconducting coil and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate fabrication and realize excellent stability and easy use, by winding a superconducting multiconductor cable made of a plurality of twisted superconducting cables onto a spool made of an insulator, and electrically connecting the ends of the individual superconducting cables to the ends of the other superconducting cables. SOLUTION: One long superconducting multiconductor cable 1 having a predetermined length is wound a plurality of times onto a bobbin 2 made of a heat insulator such as plastic or the like, thus forming a superconducting coil 20. In this case, a plurality of insulation-coated superconducting cables are spirally twisted to form the one superconducting multiconductor cable 1. After the one superconducting multiconductor cable 1 is wound on the bobbin 2, the plurality of superconducting cables constituting the superconducting multiconductor cable 1 are electrically connected so that the directions of currents I flowing through the individual superconducting cables become the same rotating direction with respect to the bobbin 2. That is, the winding end of an arbitrary superconducting cable is connected to the winding start of the next superconducting cable, and this connection is sequentially repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting coil which is used in parallel with a power supply and generates a strong electric field by utilizing zero resistance of a superconductor in a superconducting state.

[0002]

2. Description of the Related Art The superconducting state is a thermodynamic phase in which the ambient temperature or the magnetic field has a certain value T, respectively.
A superconducting state is realized below c and Hc. In the superconducting state, the electric resistance disappears. Therefore, when a current is passed through the superconducting wire in the superconducting state, a magnetic field can be generated without generating heat. A superconducting coil uses this property to generate a strong electric field.

FIG. 6 is a sectional view of a superconducting coil disclosed in, for example, "Superconducting Engineering", The Institute of Electrical Engineers of Japan (February, 1974), page 121. In FIG. 6, a stainless steel bobbin 8
One continuous superconducting wire 7 covered with formal etc.
However, it is wound in close contact with multiple stages and multiple rows while inserting the interstage insulation 6 for each stage. Also, coil excitation terminal 5
Are connected in parallel to a power supply (not shown). A cooling groove 9 is formed in the main surface of the flange 8a of the winding frame 8 on the superconducting wire 7 side so that a cooling medium, for example, liquid helium enters therein.

The superconducting coil thus formed is immersed in a cooling medium having a boiling point equal to or lower than the transition temperature Tc, such as liquid helium, to realize a superconducting state. In the superconducting state, the electric resistance of superconducting wire 7 is zero, so that current can flow up to the critical current value without generating heat. The critical current is a much larger current than a current that can be supplied to a copper wire or the like. Therefore, a strong electric field can be generated in the inner diameter portion of the superconducting coil.

[0005]

In general, a superconducting coil is used as described above. In order to obtain a predetermined magnetic field in a superconducting state, for example, a long superconducting wire 7 having a predetermined length must be wound around a bobbin 8. No. However, it is not easy to uniformly and neatly wind the long superconducting wire 7 around the winding frame 8.
Also, winding the long superconducting wire 7 around the winding frame 8 many times
Superconducting wire 7 was not excellent in stability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a superconducting coil which is easy to manufacture, has excellent stability, and is easy to use, and a method for manufacturing the same. It is intended for.

[0007]

In the superconducting coil of the present invention, a superconducting multifilamentary wire formed by twisting a plurality of superconducting wires is wound around a bobbin made of an insulator, and each superconducting wire is The end is electrically connected to the end of another superconducting wire.

In the superconducting coil according to the second aspect, the plurality of superconducting wires are connected such that the direction of the current flowing through each superconducting wire is the same as the rotation direction with respect to the bobbin.

In the superconducting coil according to a third aspect, a predetermined number of the superconducting wires are electrically connected in parallel to form a bundle, and the direction of the current flowing through the bundle is the same with respect to the bobbin. They are connected in the direction of rotation.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a superconducting coil, wherein a superconducting multifilamentary wire formed by twisting a plurality of superconducting wires is wound around a bobbin, and an end of each superconducting wire is connected to another superconducting wire. Electrically connecting to the end of the wire.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a sectional view showing a superconducting coil of the present invention. FIG. 2 is a perspective view of the superconducting multi-core wire. FIG. 3 is a sectional view of a superconducting wire. FIG. 4 is an explanatory view showing how the superconducting wires are connected. In FIG. 1, one long superconducting multifilamentary wire 1 having a predetermined length is wound a plurality of times around a bobbin 2 made of a thermal insulator such as plastics to form a superconducting coil 20.
Are formed.

In FIG. 2, a superconducting wire 4 coated with insulation is shown.
Are combined in a spiral form to form one superconducting multifilamentary wire 1. As shown in FIG. 3, one superconducting wire 4 is manufactured by covering a superconducting wire 4 b in which a superconducting element wire is embedded in copper or a high-resistance metal with an insulating coating 4 a.

FIG. 4 shows how each superconducting wire 4 is connected. After one superconducting multi-core wire 1 is wound around the bobbin 2,
As shown in FIG. 4, the plurality of superconducting wires 4 constituting the superconducting multifilamentary wire 1 are electrically connected so that the direction of the current I flowing through each superconducting wire 4 is the same as the rotation direction with respect to the bobbin 2. Connected. That is, the winding end of an arbitrary superconducting wire 4 is connected to the winding starting end of the next superconducting wire 4, and this is sequentially repeated to form one superconducting wire as a whole, and the superconducting coil 20 is formed. . The winding start end of the first superconducting wire 4 and the winding end end of the last superconducting wire 4 are connected to external electric wires as terminals. One connected superconducting wire has a predetermined length as a whole and is configured to obtain a predetermined magnetic field.

In the superconducting coil having such a configuration, the superconducting multifilamentary wire 1 formed by joining a plurality of superconducting wires 4 is wound around the bobbin 2, so that the number of times of winding is reduced and fabrication is easy. is there. In addition, since the superconducting multifilamentary wires 1 in which the superconducting wires 4 are twisted in advance are used, each superconducting wire 4 can be wound uniformly and neatly to form a superconducting coil having excellent stability.

Embodiment 2 FIG. 5 is an explanatory view showing how to connect superconducting wires showing another example of the superconducting coil of the present invention. In the present embodiment, after the superconducting multifilamentary wire 1 is wound around the bobbin 2, the plurality of superconducting wires 4 constituting the superconducting multifilamentary wire 1 are, as shown in FIG. Of superconducting wires 4 are connected at the winding start end and the winding end end and are electrically connected in parallel, and a plurality of electrically parallel bundles are produced. It is connected so that the direction of the flowing current I is in the same rotation direction with respect to the bobbin 2. The connection portion at the winding start end of the first bundle and the connection portion at the winding end end of the last bundle are connected to external electric wires as terminals. One connected superconducting wire is configured so as to obtain a predetermined magnetic field as a whole. In the example of FIG. 5, the number of superconducting wires 4 electrically connected in parallel is two, but the number is not limited to two, and the number is appropriately increased in accordance with the power supply to be used. Other configurations are the same as those of the first embodiment.

In the superconducting coil having such a configuration, a superconducting multifilamentary wire 1 formed by joining a plurality of superconducting wires 4 is wound around a bobbin 2, and a predetermined number of them are connected in parallel according to the power supply. Therefore, a superconducting coil having a predetermined magnetic field and current value can be easily manufactured. Also, by appropriately changing the number of connected coils, a predetermined magnetic field and current value can be obtained, and a superconducting coil having various characteristics can be obtained without making a large design change.

[0017]

According to the superconducting coil of the present invention, a superconducting multi-core wire formed by twisting a plurality of superconducting wires is wound around a bobbin made of an insulator, and the end of each superconducting wire is connected to the other end. Is electrically connected to the end of the superconducting wire. Therefore, a superconducting wire twisted in advance is used,
The number of windings is reduced, and fabrication is easy. Further, a plurality of superconducting wires can be wound uniformly and orderly, and a superconducting coil having excellent stability can be obtained.

In the superconducting coil according to the second aspect, the plurality of superconducting wires are connected such that the direction of current flowing through each superconducting wire is the same as the rotation direction with respect to the bobbin. Therefore, a superconducting coil having a superconducting wire of a predetermined length and capable of obtaining a predetermined magnetic field can be easily manufactured.

In the superconducting coil according to a third aspect of the present invention, a plurality of superconducting wires are electrically connected in parallel to form a bundle, and the direction of current flowing through the bundle is the same with respect to the bobbin. They are connected in the direction of rotation. Therefore, a superconducting coil having a predetermined magnetic field and current value can be easily manufactured. Also, by appropriately changing the number of connected coils, a predetermined magnetic field and current value can be obtained, and a superconducting coil having various characteristics can be obtained without making a large design change.

In the method of manufacturing a superconducting coil according to a fourth aspect, a step of winding a superconducting multicore wire formed by twisting a plurality of superconducting wires around a bobbin, and setting the end of each superconducting wire to another superconducting wire. Electrically connecting to the end of the wire. For this reason, since a superconducting multi-core wire twisted in advance is used, the number of windings is reduced and fabrication is easy. Also, multiple superconducting wires can be wound uniformly and orderly,
A superconducting coil having excellent stability can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a superconducting coil of the present invention.

FIG. 2 is a perspective view of a superconducting multi-core wire.

FIG. 3 is a cross-sectional view of a superconducting wire.

FIG. 4 is an explanatory diagram showing how a superconducting wire is connected.

FIG. 5 is an explanatory view showing how to connect superconducting wires showing another example of the superconducting coil of the present invention.

FIG. 6 is a sectional view showing a conventional superconducting coil.

[Explanation of symbols]

1 superconducting multi-core wire, 2 winding frames, 4 superconducting wires, 20 superconducting coils.

Claims (4)

[Claims] 1. A superconducting multifilamentary wire formed by twisting a plurality of superconducting wires is wound around a bobbin made of an insulator, and the end of each superconducting wire is electrically connected to the end of the other superconducting wire. A superconducting coil characterized by being electrically connected. 2. The plurality of superconducting wires are connected such that the direction of current flowing through each superconducting wire is the same as the rotation direction with respect to the bobbin. The superconducting coil as described. 3. A plurality of said superconducting wires are electrically connected in parallel to form a bundle, and a direction of a current flowing through the bundle is the same direction of rotation with respect to the bobbin. The superconducting coil according to claim 1, wherein the superconducting coil is connected in such a manner as described above. 4. A step in which a superconducting multi-core wire formed by twisting a plurality of superconducting wires is wound around a bobbin, and an end of each of the superconducting wires is electrically connected to an end of the other superconducting wire. And a method for producing a superconducting coil.