JPS6348402B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the winding of a superconducting coil, and particularly to the connection of superconducting wire used in the winding.

In general, when a superconducting coil is made by winding a superconducting wire around a conventional winding frame, the problem of connecting the superconducting wire does not occur when a single long superconducting wire is wound. When winding a relatively large superconducting coil with a wire, it is necessary to connect the superconducting wire, for example, a wire with a diameter of 1 m,
If a 1 m long coil is wound with superconducting wire with a cross section of 1 mm x 1 mm, and the required number of turns is 10,000 turns, the required length of superconducting wire will be approximately 30 km. With current technology, a superconducting wire with a cross section of about 1 mm x 1 mm can be made with a continuous length of 5 to 10 km, so a coil like this example requires at least three superconducting wires. It is necessary to connect them at two places.

Conventionally, such a superconducting coil 1 has a superconducting wire 3 wound around a winding frame 2, and a connecting portion 4 provided inside the coil winding portion, as shown in FIG. 1 of the accompanying drawings. There is. FIG. 2 shows the windings and connection portions 4 of this superconducting coil 1 shown in FIG.
As shown in FIG. 2, two superconducting wires 3 are generally connected in parallel by soldering, crimping, or the like. Such a connection 4 is shown enlarged in FIG. 3, and arrows indicate the direction of current flow. As is clear from these figures, the connection portion 4 of the superconducting wire 3
In this case, even if the space is electrically equivalent to one turn, physically the space is required to be equivalent to two turns. Therefore, since the connection part of such a conventional superconducting coil is configured as described above, one turn is lost, which creates a dead space for one turn, and the winding There are disadvantages in that the uniformity of the magnetic field is disturbed and the uniformity of the generated magnetic field is deteriorated.
In particular, this is a fatal defect in coils that require a highly uniform magnetic field.

Therefore, an object of the present invention is to provide a connection portion of a superconducting coil outside the coil winding portion and to allow current to flow through the connection of the superconducting wire in a looped manner, in order to eliminate such conventional drawbacks. Therefore, it is an object of the present invention to provide a superconducting coil which prevents loss of one turn in the coil winding and also prevents a decrease in the uniformity of the generated magnetic field.

According to this invention, in a superconducting coil in which a plurality of superconducting wires are connected and wound continuously, the connecting portions of the superconducting wires are connected to each other outside the coil winding portion. The superconducting wires are connected so that the current flowing through them is turned around.

Other objects, features and advantages of the present invention will become apparent from the detailed description taken in conjunction with the following drawings.

FIG. 4 shows an embodiment of the superconducting coil according to the present invention, and shows the first embodiment of the superconducting coil according to the present invention.
Identical or equivalent parts to those in the figures are given the same reference numerals. In the illustrated embodiment, the superconducting coil 1 of the present invention is made up of a superconducting wire 3 wound around a winding frame 2, and the connecting portion 4 connects the coil winding when the first layer coil finishes winding and enters the second layer winding. It is located outside the department. In this manner, since the connecting portion 4 is located outside the coil winding, no loss of one turn occurs within the coil winding. Furthermore, as shown in an enlarged view in FIG. 5, the connection at the connection part 4 is made by folding two superconducting wires 3 in parallel and is made by soldering, crimping, etc. Since current flows in two directions, the overall current becomes zero,
Almost no magnetic field is generated in the connecting portion 4. Therefore,
The magnetic field generated by the superconducting coil 1 is not disturbed by the connecting portion 4 at all, and the uniformity of the superconducting coil 1 is improved.

In addition, in this example, the superconducting wires are connected at the transition from the first layer winding to the second layer winding in the superconducting coil, but in relation to the continuous length of the superconducting wire 3, it is possible to connect the superconducting wires at any convenient point. Needless to say, the superconducting wires can be suitably connected when moving from one layer to the next layer.

As described above, according to the present invention, since the superconducting wire is connected outside the coil winding, there is no dead space for one turn in the coil winding at the connection part, and the uniformity of the winding is improved. There is no disturbance, and as a result, the uniformity of the generated magnetic field is improved, and since the current flows through the connections of the superconducting wires in a folded manner, almost no magnetic field is generated at the connections of the superconducting wires, and the magnetic field is uniform. You can achieve effects such as getting better once.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram of a conventional superconducting coil, Figure 2 is a diagram of the principle of connection of the winding and superconducting wire in Figure 1, Figure 3 is an enlarged view of the connection part in Figure 2, and Figure 4 is A schematic explanatory diagram of a superconducting coil according to the present invention, FIG. 5 is an enlarged view of the connection portion in FIG. 4. In the figure, 1... superconducting coil, 2... winding frame, 3...
...Superconducting wire, 4... Connection part. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1 In a superconducting coil in which multiple superconducting wires are connected and wound continuously, the connection part of the superconducting wire is
A superconducting coil, characterized in that the two superconducting wires are connected to each other so that the current flowing through the two superconducting wires is connected to each other outside the main winding portion of the coil.