JPS603545Y2 - superconducting winding - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the cooling structure of a superconducting conductor in a superconducting winding.

Compared to superconducting windings cooled in liquid helium or normal conducting windings, those with the same dimensions can carry a large current and generate a strong magnetic field.

Therefore, a large electromagnetic force acts on the superconducting conductor, and the electromagnetic force increases as the dimensions of the superconducting winding become larger.

Conventionally, various structures have been used to support this electromagnetic force. In particular, in order to reduce stress in the circumferential direction of the superconducting conductor caused by radial force, a structure in which reinforcing bands are wound in parallel with the superconducting conductor has been used. It is being

This reinforcing band is made of a material having higher mechanical strength than the superconducting conductor, such as stainless steel.

Figure 1 shows a part of a superconducting winding, in which 1 is a superconducting conductor made of superconducting wire such as NbTi alloy wire and a stabilizing material such as oxygen-free steel, and 2 is a superconducting conductor made of mechanically strong material such as stainless steel. The reinforcing band 3 made of a high quality material is an interlayer insulation for insulating between the superconducting conductor 1 and the reinforcing band 2, and is an insulating material such as glass epoxy resin.

Generally, a superconducting conductor 1, a reinforcing band 2, and a glabellar insulation 3 are stacked in parallel to form one turn, and several hundred turns to several thousand turns are wound to form a superconducting winding.

Therefore, the stress in the circumferential direction of the superconducting conductor 1 is distributed to the reinforcing band 2 and reduced, making it possible to withstand increased electromagnetic force.

However, since the cooling area of the superconducting conductor 1 is only on both sides, there is not enough cooling area to stabilize the superconducting magnet, that is, to quickly return to superconducting when a part of the superconducting winding becomes normal conductive. However, there was a drawback that the cooling area was small to increase the size.

The present invention was devised in view of the above-mentioned drawbacks, and an object of the present invention is to provide a superconducting winding in which the cooling area of the superconducting conductor is greatly expanded.

An embodiment of the present invention shown in the drawings will be described below.

In FIG. 2, parts having the same functions as those in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted.

4 is a tape-shaped insulator that is interlayer insulation and has compressive strength even at the critical temperature of liquid helium, which is a cooling medium;
For example, it is made of glass epoxy resin and is wound around the reinforcing band 2 at intervals 2a with a pitch larger than the tape width.

The reinforcing band 2 wrapped with this interlayer insulation 3 and the superconducting conductor 1 are stacked to form one tan, and are wound around a winding wire to form a superconducting winding wire.

Next, the effect will be explained.

The reinforcing band 2 receives a portion of the strong electromagnetic force acting on the superconducting conductor 1, and reduces the circumferential stress of the superconducting conductor, which has weak mechanical strength, as in the conventional case.

The interval 2a of the interlayer insulation 4 remains clear even when the superconducting conductors 1 overlap, so if the width of one pitcher of the interlayer insulation 4 is B, the cooling area of the superconducting conductor 1 on the upper and lower surfaces is approximately (1-B/
The increase in the cooling area has a very large effect on stabilizing the superconducting conductor 1.

That is, when a superconducting conductor breaks down from its superconducting state for some reason and becomes a normal conducting state, current flows through the copper portion, generating Joule heat.

In order to return to the normal conductive state, it is necessary to sufficiently cool the generated Joule heat, and the superconducting conductor 1 must be brought below a critical temperature.

Therefore, if the cooling area of the superconducting conductor 1 increases and the cooling capacity increases, the superconducting state can be easily returned.

Further, since the superconducting conductor 1 is inclined and the interlayer insulation 3 is in contact with the superconductor 1 at an angle, the generated liquid helium bubbles rise obliquely along the side surface of the interlayer insulation 4, so that there is no stagnation of the bubbles and cooling is good.

Furthermore, even if a strong electromagnetic force is generated in the superconducting conductor 1 and a compressive force acts between each layer, the contact with the interlayer insulation 4 on the upper and lower surfaces of the superconducting conductor 1 crosses each other, so the bending stress against the compressive force is It is not large and has sufficient mechanical strength.

FIG. 3 shows another embodiment in which the interlayer insulation 4 is double-wound, and since the slope of the interlayer insulation 4 is increased, bubbles of liquid helium can be easily removed and the cooling performance is improved.

This is particularly effective when the width of the electromotive conductor 1 is large.

Note that it is of course possible to use a plurality of volumes.

As described above, according to the present invention, in the superconducting winding, tape-shaped insulators are wound in parallel with the superconducting conductor at intervals and reinforcing bands wrapped with interlayer insulation are overlapped.
In addition to the side surfaces of the superconducting conductor, the gap between the interlayer insulation on the top and bottom surfaces also becomes a cooling area, improving the cooling capacity, making it easier to remove bubbles from liquid helium, stabilizing electromotive conduction faster, and making it easier to manufacture and larger. It has excellent effects such as being suitable for

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional perspective view of a conventional superconducting winding, and FIG. 2 is a partial cross-sectional perspective view showing an embodiment of the superconducting winding of the present invention.
FIG. 3 is a partially sectional perspective view showing another embodiment. 1...Superconducting conductor, 2...Reinforcement band, 4
・・・・・・Interlayer insulation.

Claims (1)

[Scope of utility model registration request] In a superconducting winding formed by overlapping and winding a superconducting conductor, interlayer insulation, and reinforcing band, the interlayer insulation includes tape-shaped insulators arranged on the reinforcing band at a pitch larger than the tape width;
A superconducting winding characterized by being formed by winding at intervals.