JPS61182203A - Superconductive coil - Google Patents

Abstract

PURPOSE:To improve cooling performance by leading terminal boards of winding ends of winding layers radially formed in a plurality and connecting winding layers one another by the boards. CONSTITUTION:Superconductive leads 3 are formed in a structure that the leads are first wound axially of a bobbin 1 and the ends of the leads 3 are led outside a terminal board 2. The ends of a coil are led from the hole 5 of the board 2, and connected with the end of the next layer. The number of turns is (integer number +1/8) per one layer, and the connecting portion of the board 2 is displaced at 45 deg. in the circumferential direction. In this structure, since there is no crossover track between the layers, no wasteful space is provided in the winding, and since a connecting portion is disposed outside the board 2, the cooling performance of the connecting portion 4 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a superconducting coil, and particularly to a superconducting coil formed by winding a superconducting wire in a solenoid shape.

[Background of the invention]

In recent years, superconducting coils have become larger year by year, and there are various problems that must be taken into account, such as increasing electromagnetic force and ensuring stability.

For example, regarding upsizing, refer to the document rENGINEERIN.
GFORMANUFACTURING Tl(E GE
NERAL DYNAMIC8CONVAIR/IGC
MAGNET FORTHE LARGE C0IL[
”ROGRAN J b.Large size as seen7.
I'm starting to feel like I need it.

There are two types of winding methods for large coils: pancake winding and solenoid winding. Pancake wrapping is a method in which one or two layers in the axial direction are prepared in advance and then connected at the outer circumferential side. This pancake wrapping is effective for short items in the axial direction, but has drawbacks such as increasing the number of connection points for long items and making stacking (firm fixation in the axial direction) difficult. Therefore, for long ones, it is advantageous to use solenoid winding, that is, a structure in which one layer in the radial direction is wound in the axial direction, and the next layer is overlapped. In the conventional solenoid-wound coil, as shown in the above-mentioned document, a winding frame is prepared and the wire is wound while forming a radial glabella crossing. An example is shown in FIG. In this method,
Because the transition part of superconducting wire 3 to the next layer is diagonal,
A spacer with a complicated structure must be inserted, and the number of turns is also reduced by the amount of transition.

In particular, in the case of compound-based superconducting wires that require low bending strain, the space of one turn may be used for crossing, which may be wasted.

In addition, since the connection will occur inside the winding,
Cooling performance is also not good.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object thereof is to provide a superconducting coil that does not take up much space and has a winding structure with good cooling performance.

[Summary of the invention]

In the present invention, a superconducting wire is wound around a bobbin in the axial direction, and the wound ends of each layer of the wound superconducting wire are formed in multiple layers in the radial direction to the outside of the end plate. The intended purpose is achieved by connecting the winding layers.

[Embodiments of the invention]

Ru.

FIG. 1 shows a coil according to one embodiment of the present invention. In the figure, the superconducting wire 3 is first wound around the bobbin 1 in the axial direction,
The structure is such that the end portion of the superconducting wire 3 is exposed outside the end plate 2. FIG. 2 is a diagram of this coil viewed from direction A, and FIG. 3 is a diagram of this coil viewed from direction B.

As shown in these figures, an opening 5 is formed in the end plate 2, and the end portion of the coil is taken out. This is connected to the end portion of the next layer on the outside of the end plate 2.

In addition, the number of turns is (integer +-) turns per layer, so as you can see from Figures 2 and 3, the connection point of the end 2 is shifted by a constant angle of 45@ in the direction of the center. There is. Moreover, as can be seen from FIG. 3, the lead line portion has returned to the same position in the circumferential direction. This is the divisor 8 of the number of layers 8
The connecting portion is shifted by an angle of 45° across 360'1, depending on λ, which may be 90'' or 180'.

The configuration of this embodiment has the following effects. First, since there is no cross-layering,
There is no wasted space within the winding. Next, since the connection part 4 is exposed at the end, the connection part 4 can be cooled extremely well, and the stability of the superconducting wire 3 is increased. Furthermore, since this structure uses a solenoid coil with one layer at a time, the axial feeding direction can be made the same during winding work. That is,
In the previous examples, if one layer is wound from the A side in FIG. 1, the next layer must be wound from the B side, but in the case of this structure, the next layer can also be wound from the A side. Normally, superconducting coils are pressurized in the axial direction to suppress movement of the windings, but if the windings are wound from only one direction, the end plate 2
can be wound using the actual machine as is, and the winding is also strong. Further, since the connecting parts 4 are shifted by a certain angle, the connecting parts 4 do not overlap, and workability is extremely good. Furthermore, since the number of turns per layer resulting from shifting is exactly the same for each layer, there is no need to adjust the length in the axial direction using a spacer. In addition, since the constant angle is 45 degrees, the position of the lead wire is the same for those from the innermost turn and the outermost turn, which is very advantageous in terms of connection to the current lead. The error magnetic field due to this is also small. Furthermore, with this structure, grading of each layer is easy, and the amount of superconducting material used can be reduced compared to conventional methods.

〔Effect of the invention〕

According to the superconducting coil of the present invention described above, the winding ends of each layer are exposed outside the end plate, and the layers are connected outside the end plate, so cooling performance is good, and there is no crossing space. This has the effect of creating a compact, rigid, and strong superconducting coil.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the superconducting coil of the present invention, and FIG. 2 is a view seen from six directions of FIG. 1.
Aperture.

Claims (1)

[Claims] 1. A superconducting wire is wound around a bobbin in the axial direction, the wound superconducting wire is formed in multiple layers in the radial direction, and an end plate is provided at the axial end of the wound superconducting wire. A superconducting coil characterized in that a winding end of each layer is exposed outside the end plate, and the winding layers are connected outside the end plate. 2. The superconducting coil according to claim 1, wherein the connection positions between the winding layers outside the end plate are shifted by a constant angle in the circumferential direction of the end plate. 3. The connection position between the winding layers is set at an angle of 360° divided by a divisor of the number of turns, or an integral multiple thereof (however, 360°
3. The superconducting coil according to claim 2, wherein the end plate is shifted by a constant angle in the circumferential direction of the end plate.