JPS5945205B2 - superconducting coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting coil formed by winding a superconducting winding. In particular, the present invention relates to a superconducting coil formed by winding a superconducting winding.
The purpose is to prevent movement, collapse, etc.

Conventionally, a cylindrical superconducting coil has had the configuration shown in FIG.

That is, in the figure, 1 is a winding frame, 2 is a superconducting winding wound around this winding frame 1, and 3 is a reinforcing winding made of high-tensile metal wire or tape. It is provided for fixation. When the superconducting coil made up of the above components is excited, an electromagnetic mechanical force proportional to the product of the current flowing through the superconducting winding 2 and the magnetic field generated in the coil acts on the superconducting winding 2 of the coil.

That is, as shown in FIG. 2, an electromagnetic mechanical force that compresses the superconducting winding 2 in the axial direction and an electromagnetic mechanical force that expands the superconducting winding 2 in the radial direction are generated. For example, if the coil is relatively large, with a diameter and length of 20 degrees or more, and the generated magnetic field is 5T or more, the accumulated electromagnetic mechanical force will be intense, especially in the compression direction. The electromagnetic mechanical force generated often exceeds 10 tons, and this electromagnetic mechanical force increases as the length of the coil increases. The reinforcing winding 3 is provided to prevent the superconducting winding 2 from breaking, moving, breaking, etc. due to these electromagnetic mechanical forces. However, in conventional superconducting coils, the reinforcing winding 3 prevents the superconducting winding 2 from separating from the winding frame 1 by suppressing the electromagnetic mechanical force that expands in the radial direction. The suppressing force is weak and has no effect on electromagnetic mechanical force compressing in the axial direction.

For this reason, as shown in FIG. 3, the superconducting winding 2 was contracted in the axial direction. For example, according to experiments conducted by the present inventors, the inner diameter is 1507lt, the outer diameter is 235n)
After a superconducting coil with a length of 200n was excited to 3.5T, axial contraction of about 6n was confirmed in the winding 2 of the superconducting coil. Such a phenomenon causes mechanical damage to the superconducting coil and causes a significant decrease in the performance of the superconducting coil. The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional ones. The present invention provides a superconducting coil with excellent performance in which movement or deformation of the superconducting winding does not occur by adding .

The invention will now be described with reference to illustrated embodiments.

In FIG. 4, 4 is a winding shaft around which the superconducting winding 2 is wound;
Reference numeral 5 denotes a flange that is integrally formed with the winding shaft 4, and 6 is a flange that has a slide portion 7 and slides along the winding shaft 3. Together with the flange 5, it serves as a support for the axial end of the superconducting winding 2 It forms the In the superconducting coil having the above-mentioned components, first, the flange 6 is temporarily fixed to the winding shaft 2, and the superconducting wire 2 is wound on the winding frame made up of the flange 5, the flange 5, and the winding shaft 4.

Then, an axis of a predetermined value equal to or greater than the cumulative maximum electromagnetic mechanical force applied to the superconducting winding 2 during excitation is applied to the superconducting winding 2 held between the pair of flanges 5 and 6 via the flange 6. The superconducting winding 2 is contracted by applying a directional compressive force, and then the slide portion 7 is fixed by welding or the like to integrate the flange 6 and the winding shaft 4. In the superconducting coil of the present invention manufactured in this way, even if excitation is applied, the superconducting winding 2 does not contract in the axial direction due to electromagnetic mechanical force. Therefore, movement and deformation of the superconducting winding 2 due to this can be prevented, and excellent excitation characteristics can be obtained. FIG. 5 compares the excitation characteristics of the superconducting coil according to the present invention obtained based on the above with those of a conventional superconducting coil.
In the figure, points A and N are the excitation characteristics of the superconducting coil according to the present invention, and the superconducting coil has an inner diameter of 15011 and an outer diameter of 2.
3511, a length of 200 n, and a diameter of 1.4211, which are wound 3880 times, and an axial compressive force of approximately 10 tons is applied to this superconducting winding 2 via a movable flange 6. On the other hand, points B and B' are the excitation characteristics of the conventional superconducting coil, and assuming that the inner diameter, outer diameter, winding diameter, and number of turns are the same as the superconducting coil according to the present invention, the coil length is 1931! 1. As is clear from the above diagram, the superconducting coil according to the present invention is sealed during the first excitation and obtains the excitation characteristics of the current and magnetic field values at point A, whereas the conventional superconducting coil obtains excitation characteristics at point B. After several excitations, the coil of the present invention finally reaches a point N near the locus 10 of the critical current of the superconducting winding.
While the current flows up to
It can be seen that the water flows only up to point B', which is about 2 points. In addition, in the conventional type, separation of the winding 2 and the winding frame was observed due to contraction of the winding 2 in the axial direction after excitation, but this was not observed at all in the inventive type, and it exhibited excellent performance as described above. We were able to.
In the above embodiment, a predetermined value of axial compressive force is applied to the superconducting winding 2 held between the flanges 5 and 6 to prevent axial contraction during excitation. As another example, after tightening the reinforcing outer cylinder 8 made of a non-magnetic material around the outer periphery of the winding 2, compressive force in the axial direction can be applied via the flange 6, and this reinforcing outer cylinder 8 This prevents local deformation of the winding 2 when applying compressive force in the axial direction, and also prevents breakage and movement of the winding 2 due to electromagnetic mechanical force that diffuses in the radial direction during excitation. This is particularly effective.

Further, in the above embodiment, the flange 6 that slides along the winding shaft 4 is fixed by welding, but the present invention is not limited to this, and other fixing devices may be used.

Furthermore, the superconducting coil according to the present invention can be widely applied to race track coils and oval coils in addition to cylindrical coils.

As described above, according to the present invention, the superconducting winding is sandwiched between a pair of flanges and a predetermined compressive force in the axial direction is applied, so that the winding does not move or break due to electromagnetic mechanical force. Superconducting coils with superior performance can be obtained.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing a conventional superconducting coil, Fig. 2 is a conceptual diagram showing the direction of electromagnetic mechanical force applied to the superconducting coil shown in Fig. A conceptual diagram showing shrinkage of a wire, FIG. 4 is a vertical cross-sectional view showing a superconducting coil according to an embodiment of the present invention, and FIG. 5 is a graph showing the characteristics of the superconducting coil according to the present invention in comparison with a conventional superconducting coil. , FIG. 6 is a longitudinal sectional view showing a superconducting coil according to another embodiment of the present invention. 2... Superconducting winding, 4... Winding shaft, 5,
6...flange, 8...reinforced outer cylinder, and the same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A winding frame comprising a winding shaft, a pair of flanges formed at both ends of the winding shaft and supporting the axial ends of the superconducting winding, and the winding shaft and the pair of flanges. 1. A superconducting coil, comprising: a superconducting coil that is wound, the superconducting coil being sandwiched between the pair of flanges and applying a predetermined compressive force in the axial direction. 2. The superconducting coil according to claim 1, wherein the flange is fixed to the winding shaft by welding. 3. The superconducting coil according to claim 1 or 2, characterized in that a reinforcing outer cylinder made of a non-magnetic material is provided around the outer periphery of the superconducting winding.