Superconducting electromagnet

Abstract

To provide a superconducting electromagnet in which a manufacturing of a connection part of both superconducting electromagnets is facilitated without applying deviation of a permission deviation amount or larger in a large-sized superconducting electromagnet for a nuclear fusion reactor.SOLUTION: A superconducting electromagnet according to the present disclosure, comprises: a plurality of superconducting electromagnet wires that is wound at a same core shape, and is laminated to a radial direction to a shaft to be wound; and a plurality of connection terminals that is provided to at least one end part of the plurality of superconducting electromagnet wires, and connects the adjacent superconducting electromagnet wires. The plurality of superconducting electromagnet wires is one that is wound to the radial direction to the shaft where each single wire is wound by one layer, and is combined in order from an inner side of the radial direction or an outside of the radial direction. The adjacent superconducting electromagnet wires are connected to any one of a connection terminal provided to one side of the shaft direction to be wound and a connection terminal provided to the other side, and include at least any one of an inner connection part that is arranged so as to be closer to the shaft to which both of the connection terminals are wound and are connected and an outer side connection part that is arranged so as to be separated from the shaft to which both of the connection terminals are wound and are connected.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This disclosure relates to large superconducting electromagnets for nuclear fusion reactors. [Background technology]

[0002] Electromagnets for nuclear fusion reactors are large, with external dimensions of the order of 10 m. A large current is required to generate a strong magnetic field with an electromagnet, and materials capable of generating a strong magnetic field with low loss are suitable. For this reason, superconducting electromagnets using superconducting wires (composite conductors containing superconducting materials) that can pass a large current with zero or low loss are used for electromagnets for nuclear fusion reactors. Examples of superconducting wires include composite conductors containing superconducting materials such as Nb3Sn and Nb3Al, which are intermetallic compounds. Nb3Sn and Nb3Al are used for applications that generate a strong magnetic field, and in order to use intermetallic compound superconducting wires as superconducting electromagnets for nuclear fusion reactors, they must be bent within a bending range (allowable strain) in which the characteristics of the superconducting wire do not deteriorate after heat treatment.

[0003] Generally, the winding work for winding the intermetallic compound superconducting wire into the shape of an electromagnet is performed before the heat treatment. After the heat treatment, the heat-treated superconducting wire is subjected to assembly work such as insulation and connection of the conductor. However, since the intermetallic compound superconducting wire has a small allowable strain after the heat treatment, it is difficult to configure a superconducting electromagnet with multiple layers and a large number of windings from a single superconducting wire due to the strain applied to the superconducting wire during the work. Patent Document 1 discloses a technology in which the superconducting wire is wound in the axial direction of the winding for one layer, and the winding is configured in multiple layers. With such a configuration, it is possible to increase the number of windings in multiple layers of the superconducting electromagnet, and a strong magnetic field can be generated. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 3-178103 Summary of the Invention [Problem to be solved by the invention]

[0005] When constructing a superconducting electromagnet with multiple layers of windings, it is necessary to connect the superconducting wires together, but Patent Document 1 does not specifically describe how to connect the superconducting wires together. Since superconducting electromagnets for nuclear fusion reactors use superconducting wires with a small allowable strain, the joints between the superconducting wires must be manufactured by butting the end faces of the superconducting wires together. However, this method has the problem of increasing the difficulty of manufacturing the joints between the superconducting wires.

[0006] The present disclosure is devised to solve the above-mentioned problems, and provides a superconducting electromagnet with a structure that makes it easy to manufacture connections between superconducting wires, does not require the conductor to bend or stretch beyond the allowable strain, and can suppress deterioration of the conductor's superconducting properties. [Means for solving the problem]

[0007] The superconducting electromagnet according to the present disclosure comprises a plurality of superconducting wires wound concentrically and stacked radially with respect to the axis around which they are wound, and a plurality of connection terminals provided at at least one end of the plurality of superconducting wires and connecting adjacent superconducting wires to each other, each of the plurality of superconducting wires being wound in a single layer radially with respect to the axis around which a single wire is wound, and the plurality of superconducting wires are combined in order from the radially inside or the radially outside, and adjacent superconducting wires are connected by at least one of a connection terminal provided on one side in the axial direction around which they are wound and a connection terminal provided on the other side, and has at least one of an inner connection portion where the connection terminals are arranged and connected close to the axis around which they are wound, and an outer connection portion where the connection terminals are arranged and connected away from the axis around which they are wound. Effect of the Invention

[0008] The superconducting electromagnet according to the present disclosure has a structure that makes it easy to manufacture the connections between the superconducting wires, and when combining adjacent windings, the connection terminals are positioned so that they do not interfere with each other in the direction in which the combination proceeds. This prevents the conductor from having to bend or stretch beyond the allowable strain, thereby suppressing deterioration of the conductor's superconducting properties. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing an overview of a superconducting electromagnet according to a first embodiment of the present disclosure. [Diagram 2] 1 is a cross-sectional view showing an arrangement of superconducting wires of a superconducting electromagnet according to a first embodiment of the present disclosure. [Diagram 3] 2 is a cross-sectional view showing the arrangement of superconducting wires during assembly of the superconducting electromagnet according to the first embodiment of the present disclosure. FIG. [Figure 4] FIG. 2 is a cross-sectional view showing an insulation process for the superconducting electromagnet according to the first embodiment of the present disclosure. [Diagram 5] 2 is a schematic diagram showing an arrangement of connection terminals of a superconducting electromagnet according to a first embodiment of the present disclosure. FIG. [Figure 6] FIG. 11 is a cross-sectional view showing a configuration of a superconducting electromagnet according to a second embodiment of the present disclosure. [Figure 7] FIG. 11 is a schematic diagram showing a configuration of a superconducting electromagnet according to a third embodiment of the present disclosure. [Figure 8] FIG. 11 is a cross-sectional view showing an arrangement of superconducting wires of a superconducting electromagnet according to a fourth embodiment of the present disclosure. [Figure 9] FIG. 11 is a cross-sectional view showing the arrangement of superconducting wires during assembly of a superconducting electromagnet according to a fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a superconducting electromagnet according to an embodiment will be described in detail with reference to the drawings.

[0011] Embodiment 1 FIG. 1 is a schematic diagram showing an overview of a superconducting electromagnet according to the first embodiment of the present disclosure. FIG. 2 is a cross-sectional view showing the arrangement of superconducting wires of the superconducting electromagnet according to the first embodiment of the present disclosure. As shown in FIGS. 1 and 2, the superconducting electromagnet 1 according to the first embodiment of the present disclosure includes a plurality of superconducting wires 10a, 10b, 10c, and 10d (hereinafter also collectively referred to as "superconducting wires 10") that are concentrically wound and stacked in a radial direction with respect to an axis around which the wires are wound, and connection terminals 20a, 20b, 20c, 20d, 30b, and 30c that are provided at at least one end of the superconducting wires 10 and connect adjacent superconducting wires 10 to each other. In this case, the connection terminals 20a, 20b, 20c, and 20d are provided at the ends of the superconducting wires 10a, 10b, 10c, and 10d from the outside toward the inside in the radial direction with respect to the axis of the winding. The connection terminals 30b and 30c are provided at the ends of the superconducting wires 10b and 10c, from the inside to the outside in the radial direction relative to the axis of the winding. The connection terminals 10b and 10c are provided at both ends of the superconducting wire 10c, and are arranged so that the attachment angles of the connection terminals 10b and 10c are different in the circumferential direction relative to the axis of the winding. The connection terminal 10d is provided opposite the connection terminal 10c.

[0012] The superconducting wire 10 is a composite conductor containing a superconducting material such as Nb3Sn. The superconducting wires 10a, 10b, 10c, and 10d are each covered with an insulating material 70 (not shown). That is, the superconducting wires 10a, 10b, 10c, and 10d are adjacent to each other in the radial direction with the insulating material 70 interposed therebetween. The insulating material 70 is, for example, an insulating sheet or insulating tape. Power supply connection terminals 80 are provided on both ends of the superconducting electromagnet 1, and a magnetic field is generated by passing a current through the power supply connection terminals 80.

[0013] Although the superconducting electromagnet 1 in the first embodiment of the present disclosure is shown as being configured with four layers, it may be configured with four or more layers, or four or less layers.

[0014] The superconducting wires 10a, 10b, 10c, and 10d are stacked in such a way that the distance from the winding axis increases, i.e., in the radial direction. Hereinafter, the superconducting wires 10a, 10b, 10c, and 10d are also referred to as the first superconducting wire 10a, the second superconducting wire 10b, the third superconducting wire 10c, and the fourth superconducting wire 10d, in order from the one located radially inward with respect to the winding axis. In addition, hereinafter, among the connection terminals 20a, 20b, 20c, 20d, 30b, and 30c, the connection terminals 20a, 20b, 20c, and 20d located on one side in the axial direction in which the superconducting wire 10 is wound are also referred to as the first connection terminals 20a, 20b, 20c, and 20d, and the connection terminals 30a and 30b located on the other side are also referred to as the second connection terminals 30a and 30b.

[0015] A first connection terminal 20a is provided at one end of the first superconducting wire 10a. A first connection terminal 20b is provided at one end of the second superconducting wire 10b, and a second connection terminal 30b is provided at the other end. A first connection terminal 20c is provided at one end of the third superconducting wire 10c, and a second connection terminal 30c is provided at the other end. A first connection terminal 20d is provided at one end of the fourth superconducting wire 10d.

[0016] The first superconducting wire 10a and the second superconducting wire 10b are electrically connected to each other by the adjacent first connection terminals 20a, 20b on one side of the axial direction in which they are wound. The second superconducting wire 10b and the third superconducting wire 10c are electrically connected to each other by the adjacent second connection terminals 30b, 30c on the other side of the axial direction in which they are wound. The third superconducting wire 10c and the fourth superconducting wire 10d are electrically connected to each other by the adjacent first connection terminals 20c, 20d on one side of the axial direction in which they are wound. In this way, the superconducting electromagnet 1 is configured by connecting all the superconducting wires 10.

[0017] 3 is a cross-sectional view showing the arrangement of superconducting wires during assembly of the superconducting electromagnet according to the first embodiment of the present disclosure. The superconducting electromagnet 1 in this embodiment is assembled by stacking superconducting wires 10 located radially inward from the top to the bottom of the page. The second superconducting wire 10b is wound in advance so as to run along the first superconducting wire 10a located radially innermost.

[0018] The first connection terminal 20a connected to one end of the first superconducting wire 10a and the first connection terminal 20b connected to one end of the second superconducting wire 10b are arranged adjacent to each other on one side of the axial direction of the winding, so that the connection terminals 20a and 20b can be assembled while being in contact with each other during assembly. At this time, the outer connection part to which the first connection terminal 20a and the first connection terminal 20b are connected is arranged away from the axis of the winding. In other words, the positions of the connection terminals 20a and 20b, which are the outer connection parts, and the relative positions of the corresponding superconducting wires 10a and 10b are shifted differently toward the outside in the radial direction. Here, the connection part refers to the point where the connection terminals are connected to each other. With this structure, it is possible to assemble the superconducting wires 10a and 10b and the connection terminals 20a and 20b without interference with anything other than the objects to be contacted.

[0019] Also, the second connection terminal 30b connected to the other end of the second superconducting wire 10b is disposed on the other side in the axial direction of the winding. The first superconducting wire 10a and the second superconducting wire 10b are electrically connected by connecting the first connection terminal 20a and the first connection terminal 20b adjacent to each other on one side in the axial direction of the winding.

[0020] The third superconducting wire 10c is wound in advance so as to be along the second superconducting wire 10b. The second connection terminal 30b connected to the other end of the second superconducting wire 10b and the second connection terminal 30c connected to the other end of the third superconducting wire 10c are arranged so as to be adjacent to each other on one side of the axial direction of the winding, so that the connection terminals 30c and 30b can be assembled while being brought into contact with each other during assembly. At this time, the inner connection part to which the second connection terminal 30b and the second connection terminal 30c are connected is arranged so as to be close to the axis of the winding. In other words, the positions of the connection terminals 30b and 30c, which are the inner connection parts, and the positions of the corresponding superconducting wires 10b and 10c are shifted differently toward the inside in the radial direction. With this structure, it is possible to assemble the superconducting wires 10b and 10c and the connection terminals 30b and 30c without interference with anything other than the objects to be contacted.

[0021] Moreover, the first connection terminal 20c connected to one end of the third superconducting wire 10c is disposed on one side in the axial direction of the winding. At this time, the first connection terminal 20c is disposed so as not to interfere with the other first connection terminals 20a, 20b. The second connection terminal 30c connected to the other end of the third superconducting wire 10c is disposed so as to be adjacent to the second connection terminal 30b on the other side in the axial direction of the winding. The second superconducting wire 10b and the third superconducting wire 10c are made conductive by connecting the second connection terminal 30b and the second connection terminal 30c adjacent to each other on the other side in the axial direction of the winding.

[0022] The fourth superconducting wire 10d is wound in advance along the third superconducting wire 10c. The first connection terminal 20c connected to one end of the third superconducting wire 10c and the first connection terminal 20d connected to one end of the fourth superconducting wire 10d are arranged adjacent to each other on one side of the axial direction of the winding, so that the connection terminals 20c and 20d can be assembled while being in contact with each other. At this time, the outer connection part to which the first connection terminal 20c and the first connection terminal 20d are connected is arranged away from the axis of the winding. With this structure, it is possible to assemble the superconducting wires 10c and 10d and the connection terminals 20c and 20d without interfering with anything other than the object to be contacted. The fourth superconducting wire 10d is electrically connected to the third superconducting wire 10c by connecting the first connection terminal 20c and the first connection terminal 20d arranged on one side of the axial direction of the winding.

[0023] In this way, the superconducting wire 10 is alternately connected layer by layer between the first connection terminals 20a, 20b, 20c, 20d arranged on one side in the axial direction and the second connection terminals 30b, 30c arranged on the other side in the axial direction. At this time, the outer connection parts are arranged away from the axis around which the wire is wound, and the inner connection parts are arranged close to the axis around which the wire is wound. By connecting in this way, the superconducting wire 10 can be assembled while preventing contact between the superconducting wire 10 and other connection terminals.

[0024] FIG. 4 is a cross-sectional view showing an insulation process of a superconducting electromagnet according to the first embodiment of the present disclosure. When a superconducting electromagnet is manufactured using a superconducting wire of an intermetallic compound, the allowable strain is small, so a process of winding the superconducting wire into a winding and subjecting the winding to a heat treatment is required. (a) of FIG. 4 shows a second superconducting wire 10b wound into the shape of a superconducting electromagnet after heat treatment. At this time, each layer of the superconducting wire 10b is in close contact with each other. (b) of FIG. 4 shows a process of insulating the second superconducting wire 10b after heat treatment. A first connection terminal 20b is connected to one end of the second superconducting wire 10b, and a second connection terminal 30b is connected to the other end. At this time, the outer connection portion is arranged so as to be away from the axis around which the wire is wound, and the inner connection portion is arranged so as to be close to the axis around which the wire is wound. By lowering the superconducting wire from the top to the bottom of the paper, gaps can be sequentially provided between the superconducting wires. The second superconducting wire 10b is covered by winding the insulating material 70 in the gap generated at this time. By covering the superconducting wire 10 with the insulating material 70 in this manner, the superconducting wire 10 can be insulated with the gap expansion amount suppressed to the allowable strain amount of the superconducting wire 10 or less.

[0025] 4 shows an example in which insulating material 70 is wound around only second superconducting wire 10b, but when multiple superconducting wires 10 are used, insulating material 70 is wound around each of the multiple superconducting wires 10. Thus, according to the superconducting electromagnet according to embodiment 1 of the present disclosure, the superconducting wire can be accessed from both sides, making conductor insulation easy. Furthermore, since the superconducting wire can be accessed from both sides, conductor insulation is possible even when the expansion amount of the gap between the superconducting wires is small, and it is possible to manufacture a superconducting electromagnet with an expansion amount equal to or less than the allowable strain amount.

[0026] FIG. 5 is a schematic diagram showing the arrangement of the connection terminals of the superconducting electromagnet according to the first embodiment of the present disclosure. As shown in FIG. 5, the first superconducting wire 10a and the second superconducting wire 10b are wound concentrically and arranged in order from the inside in the radial direction. The first connection terminal 20a and the first connection terminal 20b are connected to each other at the side surfaces along the circumferential direction along which the superconducting wires are wound. At this time, the positions of the connection terminals 20a and 20b and the corresponding positions of the superconducting wires 10a and 10b are shifted so as to be different toward the outside in the radial direction. That is, the superconducting wires 10a and 10b are arranged so that the outer connection parts to which the connection terminals 20a and 20b are connected are separated from the axis around which they are wound. By shifting the positions of the connection terminals 20a and 20b and the corresponding positions of the superconducting wires 10a and 10b in this way, the superconducting wires 10 can be easily connected to each other. Furthermore, by connecting the circumferential side surface of the first connection terminal 20a and the circumferential side surface of the first connection terminal 20b, the contact area can be made larger than when the end faces of the superconducting wire 10 are butted together.

[0027] As described above, the superconducting electromagnet 1 according to the first embodiment of the present disclosure includes a plurality of superconducting wires wound concentrically and stacked radially with respect to the axis around which they are wound, and a plurality of connection terminals provided at at least one end of the plurality of superconducting wires to connect adjacent superconducting wires. Each of the plurality of superconducting wires is a single wire wound in a single layer radially with respect to the axis around which it is wound, and is assembled in order from the radial inside or the radial outside. Adjacent superconducting wires are connected by at least one of a connection terminal provided on one side of the axis around which they are wound and a connection terminal provided on the other side, and have at least one of an inner connection part where the connection terminals are arranged and connected to each other so as to be close to the axis around which they are wound, and an outer connection part where the connection terminals are arranged and connected to each other so as to be away from the axis around which they are wound. Therefore, the conductor bending and stretching work beyond the allowable strain amount does not occur, and deterioration of the superconducting properties of the conductor can be suppressed.

[0028] Furthermore, according to the superconducting electromagnet 1 according to the first embodiment of the present disclosure, the windings are wound one layer at a time to form a multilayer structure, which allows assembly without significant deformation, and therefore has the effect of facilitating the manufacture of the superconducting electromagnet 1 using the superconducting wire 10 containing an intermetallic compound with a small allowable strain. Here, the superconducting wire containing an intermetallic compound is Nb3Sn, Nb3Al, or the like.

[0029] Furthermore, since the superconducting electromagnet 1 according to the first embodiment of the present disclosure is formed by winding the superconducting wires 10a, 10b, 10c, and 10d, which are single wires, in one layer (one turn), insulation between the superconducting wires is easily achieved, making it easier to manufacture the superconducting electromagnet.

[0030] Furthermore, according to the superconducting electromagnet 1 according to the first embodiment of the present disclosure, the superconducting wires are assembled in one direction by moving the superconducting wires of each layer from top to bottom, so that a large device for performing the assembly work while moving the superconducting wires up and down is not required, and therefore costs can be reduced. In addition, the work itself can be simplified, so the work period can be shortened.

[0031] Furthermore, according to the superconducting electromagnet 1 according to the first embodiment of the present disclosure, a cooling medium can be caused to flow from the connection between the connection terminals, thereby reducing pressure loss of the cooling medium and improving cooling efficiency. Also, it is possible to change the superconducting wire for each layer of the superconducting electromagnet to one suited to the magnetic field strength and critical current characteristics, which allows for cost reduction by reducing the amount of expensive superconducting wire used.

[0032] Embodiment 2 In the second embodiment, the same components as those in the first embodiment of the present disclosure are designated by the same reference numerals, and the description of the same or corresponding parts will be omitted. Hereinafter, the superconducting electromagnet 1b according to the second embodiment will be described with reference to the drawings.

[0033] FIG. 6 is a cross-sectional view showing the configuration of a superconducting electromagnet according to embodiment 2 of the present disclosure. As shown in FIG. 6, the superconducting electromagnet 1b according to embodiment 2 of the present disclosure includes a plurality of superconducting wires 10a, 10b, 10c, and 10d that are concentrically wound and stacked radially with respect to the axis around which they are wound, as in embodiment 1, and connection terminals 20a, 20b, 20c, 20d, 30b, and 30c that are provided at at least one end of the superconducting wires 10 and connect adjacent superconducting wires 10 to each other. In embodiment 1, an example was shown in which the superconducting wires 10 are stacked in order from the inside in the radial direction with respect to the axis around which the superconducting wires 10 are wound. In contrast, in the superconducting electromagnet 1b according to embodiment 2 of the present disclosure, the superconducting wires 10 are stacked in order from the outside in the radial direction.

[0034] As in the first embodiment of the present disclosure, when a superconducting electromagnet is manufactured using a superconducting wire of an intermetallic compound, the allowable strain is small, so the superconducting wire is wound into a winding and the winding is required to be heat-treated. In the superconducting electromagnet 1b, the fourth superconducting wire 10d, which is a winding that has been subjected to heat treatment, is arranged first. Next, the third superconducting wire 10c, which is a winding that has been subjected to heat treatment, is arranged so that the first connection terminal 20d connected to one end of the fourth superconducting wire 10d and the first connection terminal 20c connected to one end of the third superconducting wire 10c are adjacent to each other. Next, the second superconducting wire 10b, which is a winding that has been subjected to heat treatment, is arranged so that the second connection terminal 30c arranged at the other end of the third superconducting wire 10c and the second connection terminal 30b arranged at the other end of the second superconducting wire 10b are adjacent to each other. Then, the superconducting wire 10a, which is a heat-treated winding, is arranged so that the first connection terminal 20b provided at one end of the second superconducting wire 10b and the connection terminal 20a provided at one end of the first superconducting wire 10a are adjacent to each other. In this manner, all the superconducting wires are made conductive via the connection terminals to form the superconducting electromagnet 1b.

[0035] At this time, connection terminals 20a, 20b, 20c, and 20d are provided at the ends of superconducting wires 10a, 10b, 10c, and 10d from the radially outward side relative to the axis of the winding. Connection terminals 30b and 30c are provided at the ends of superconducting wires 10b and 10c from the radially outward side relative to the axis of the winding to the radially inward side. In other words, in the second embodiment of the present disclosure, the arrangement of the connection terminals is reversed compared to the first embodiment.

[0036] As described above, the superconducting electromagnet 1b according to the first embodiment of the present disclosure includes, as in the first embodiment, a plurality of superconducting wires that are concentrically wound and stacked radially with respect to the axis around which they are wound, and a plurality of connection terminals that are provided at at least one end of the plurality of superconducting wires and connect adjacent superconducting wires to each other, and each of the plurality of superconducting wires is wound in a single layer radially with respect to the axis around which a single wire is wound, and is assembled in order from the radial inside or the radial outside, and adjacent superconducting wires are connected by at least one of a connection terminal provided on one side of the axial direction around which the wires are wound and a connection terminal provided on the other side, and has at least one of an inner connection part where the connection terminals are arranged and connected to each other so as to be close to the axis around which the wires are wound, and an outer connection part where the connection terminals are arranged and connected to each other so as to be away from the axis around which the wires are wound. This makes it possible to connect the superconducting wires to each other without applying a strain greater than the allowable strain amount.

[0037] Furthermore, since the same effect as in the first embodiment can be achieved even if the superconducting electromagnet 1b is arranged from the radially outer side as described above, the superconducting electromagnet 1b can be manufactured without being limited by the order of assembling the superconducting wire 10.

[0038] Embodiment 3 In the third embodiment, the same components as those in the first embodiment of the present disclosure are designated by the same reference numerals, and the description of the same or corresponding parts will be omitted. Hereinafter, a superconducting electromagnet 1c according to the third embodiment will be described with reference to the drawings.

[0039] FIG. 7 is a schematic diagram showing the configuration of a superconducting electromagnet according to the third embodiment of the present disclosure. The superconducting electromagnet 1c according to the third embodiment of the present disclosure includes a plurality of superconducting wires 10a, 10b, 10c, and 10d that are wound concentrically and stacked radially with respect to the axis around which they are wound, as in the first embodiment, and connection terminals 20a, 20b, 20c, 20d, 30b, and 30c that are provided at at least one end of the superconducting wires 10 and connect adjacent superconducting wires 10 to each other. However, the superconducting wires 10c and 10d and the connection terminals 20c, 20d, 30b, and 30c are not shown. In the superconducting electromagnet 1c according to the third embodiment of the present disclosure, as shown in FIG. 7, the connection terminals 20a and 20b are provided perpendicular to the circumferential direction in which the superconducting wires are wound. By providing the connection terminals in this manner, it is possible to avoid interference between the superconducting wires by shifting the connection terminals during manufacturing. Even when the connection terminal is provided perpendicular to the circumferential direction in which the conductive wire is wound, the inner connection portion and the outer connection portion can be formed by moving the connection portion closer to or farther from the axis.

[0040] The superconducting electromagnet 1c according to the third embodiment of the present disclosure also includes, as in the first embodiment, a plurality of superconducting wires that are concentrically wound and stacked radially with respect to the axis around which they are wound, and a plurality of connection terminals that are provided at at least one end of the plurality of superconducting wires and connect adjacent superconducting wires to each other, and each of the plurality of superconducting wires is wound in a single layer radially with respect to the axis around which a single wire is wound, and is assembled in order from the radial inside or the radial outside, and adjacent superconducting wires are connected by at least one of a connection terminal provided on one side of the axial direction around which they are wound and a connection terminal provided on the other side, and has at least one of an inner connection part where the connection terminals are arranged and connected to each other so as to be close to the axis around which they are wound, and an outer connection part where the connection terminals are arranged and connected to each other so as to be away from the axis around which they are wound. This makes it possible to connect the superconducting wires to each other without applying a strain greater than the allowable strain amount.

[0041] In addition, in the superconducting electromagnet 1c, the connection terminals 20a and 20b are provided perpendicular to the circumferential direction in which the superconducting wire is wound. Therefore, by shifting the connection terminals during manufacturing, interference between the superconducting wires can be avoided.

[0042] In addition, in the superconducting electromagnet 1c according to the third embodiment of the present disclosure, an example has been shown in which the connection terminals 20a and 20b are arranged perpendicular to the circumferential direction in which the superconducting wire is wound, but the connection terminals 20c, 20d, 30b, and 30c may also be connected in this manner.

[0043] Embodiment 4 In the fourth embodiment, the same components as those in the first embodiment of the present disclosure are designated by the same reference numerals, and the description of the same or corresponding parts will be omitted. Hereinafter, a superconducting electromagnet 1d according to the fourth embodiment will be described with reference to the drawings.

[0044] 8 is a cross-sectional view showing the arrangement of superconducting wires in a superconducting electromagnet according to embodiment 4 of the present disclosure. While superconducting electromagnet 1 according to embodiment 1 is constituted by winding superconducting wires 10a, 10b, 10c, and 10d, which are single wires, in one layer each, superconducting electromagnet 1d according to embodiment 4 of the present disclosure is constituted by winding superconducting wires 40e, 40f, and 40g, which are single wires, in two layers (two turns) concentrically each. In superconducting electromagnet 1d, superconducting wires 40e, 40f, and 40g are stacked in order from the radially inner side.

[0045] As shown in FIG. 8, in the superconducting electromagnet 1d according to the fourth embodiment of the present disclosure, a connection terminal 50e is connected to an end of the outer layer of the two layers formed of the superconducting wire 40e. A connection terminal 60f is connected to an end of the inner layer of the two layers formed of the superconducting wire 40f. A connection terminal 50f is connected to an end of the outer layer of the two layers formed of the superconducting wire 40f. A connection terminal 60g is connected to an end of the inner layer of the two layers formed of the superconducting wire 40g. The superconducting wires 40e and 40f are electrically connected by connecting the connection terminals 50e and 60f. The superconducting wires 40f and 40g are electrically connected by connecting the connection terminals 50f and 60g. At this time, the connection terminals 50e and 60f and the connection terminals 50f and 60g are connected to each other at a connection portion so as to be separated from the axis around which the wire is wound. With this structure, it is possible to assemble the superconducting wires 40e, 40f, and 40g, and the connection terminals 50e, 50f, 60f, and 60g without interference with anything other than the objects to which they are to be contacted.

[0046] Fig. 9 is a cross-sectional view showing the arrangement of superconducting wires when assembling a superconducting electromagnet according to the fourth embodiment of the present disclosure. In Fig. 9, superconducting wire 40e and superconducting wire 40f are assembled from the top to the bottom of the paper of Fig. 9, with superconducting wire 40f assembled along the outer layer of superconducting wire 40e. At this time, since connection terminal 50e of superconducting wire 40e and connection terminal 60f of superconducting wire 40f are arranged to be in contact with each other, the connection terminals do not interfere with each other, and the superconducting wires can be stacked without straining them. The same applies to superconducting wire 40f and superconducting wire 40g.

[0047] As described above, the superconducting electromagnet 1d of the present disclosure includes a plurality of superconducting wires wound concentrically and stacked radially with respect to the axis around which they are wound, and a plurality of connection terminals provided at at least one end of the plurality of superconducting wires to connect adjacent superconducting wires to each other, each of the plurality of superconducting wires being wound in two layers radially with respect to the axis around which a single wire is wound, and being assembled in order from the radially inner side or the radially outer side, adjacent superconducting wires being connected to at least one of the connection terminals provided on one side of the axis around which they are wound and the connection portion where the connection terminals are connected to each other is arranged away from the axis around which they are wound. As a result, as in the first embodiment, the conductor bending and stretching work beyond the allowable strain amount does not occur, and deterioration of the superconducting characteristics of the conductor can be suppressed. Furthermore, since the number of connections between the superconducting wires is reduced, the connection resistance of the superconducting electromagnet can be reduced.

[0048] In the superconducting electromagnet of the present disclosure, the procedure for assembling the superconducting wires in each layer after the insulation is completed has been described. However, a method can also be employed in which, after the insulation and assembly of the superconducting wires in a certain layer is completed, the combination is assembled while the insulation of the next layer is being performed.

[0049] Furthermore, while the superconducting wire in the superconducting electromagnet of the present disclosure has been described in the above embodiment as having a rectangular cross-sectional shape, the cross-sectional shape may be a circle, an ellipse, or the like.

[0050] Additionally, while the shape of the superconducting electromagnets in the present disclosure has been described as being circular, the electromagnets may be D-shaped, rectangular, racetrack, or the like.

[0051] The configurations shown in the above embodiments are merely examples of the contents of the present disclosure, and may be combined with other known techniques. Furthermore, parts of the configurations may be omitted or modified without departing from the scope of the present disclosure. [Explanation of symbols]

[0052] 1 1b 1c 1d superconducting magnet, 10a 10b 10c 10d 40e 40f 40g superconducting wire, 20a 20b 20c 20d 30a 30b 30c30d 50e 50f 60f 60g connection terminal, 70 insulating material, 80 power connection terminal

Claims

1. A plurality of superconducting wires wound concentrically and stacked radially with respect to an axis around which they are wound; a plurality of connection terminals provided at at least one end of the plurality of superconducting wires and connecting adjacent ones of the superconducting wires to each other; The plurality of superconducting wires are each formed by winding a single wire in one layer in the radial direction around the winding axis, and are combined in order from the radially inner side or the radially outer side, and adjacent superconducting wires are connected by at least one of the connection terminals provided on one side of the winding axial direction and the connection terminals provided on the other side, A superconducting electromagnet having at least one of an inner connection portion in which the connection terminals are arranged and connected to each other so as to be closer to the axis around which the magnet is wound, and an outer connection portion in which the connection terminals are arranged and connected to each other so as to be away from the axis around which the magnet is wound.

2. 2. The superconducting electromagnet according to claim 1, wherein the plurality of superconducting wires at least comprise, in order from the inside in the radial direction, a first superconducting wire, a second superconducting wire, and a third superconducting wire, the first superconducting wire and the second superconducting wire are connected by the connection terminal provided on one side of the axis around which the wire is wound, and the second superconducting wire and the third superconducting wire are connected by the connection terminal provided on the other side of the axis around which the wire is wound.

3. 3. The superconducting electromagnet according to claim 1, wherein the material of the superconducting wire contains Nb3Sn.

4. 3. The superconducting electromagnet according to claim 1, wherein the plurality of connection terminals are connected to each other on side surfaces along a circumferential direction in which the superconducting wire is wound.

5. 3. The superconducting electromagnet according to claim 1, wherein the connection terminals are provided perpendicular to a circumferential direction in which the superconducting wire is wound.

6. 3. The superconducting electromagnet according to claim 1, wherein the cross-sectional shape of the superconducting wire includes at least one of a rectangle, a circle, and an ellipse.

7. 3. The superconducting electromagnet according to claim 1, wherein the superconducting wire is wound to have at least one of a circle, a D-shape, a rectangle, and a racetrack shape.

8. A plurality of superconducting wires wound concentrically and stacked radially with respect to an axis around which they are wound; a plurality of connection terminals provided at at least one end of the plurality of superconducting wires and connecting adjacent ones of the superconducting wires to each other; a superconducting electromagnet characterized in that each of the multiple superconducting wires is a single wire wound in two layers in the radial direction around the winding axis, and is combined in order from the radial inside or the radial outside, adjacent superconducting wires are connected to at least one of the connection terminal provided on one side of the winding axial direction and the connection terminal provided on the other side, and a connection portion where the connection terminals are connected to each other is positioned away from the winding axis.

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