High-temperature superconducting coil and high-temperature superconducting coil device

Abstract

To reduce the risk of property deterioration due to deformation of a high-temperature superconducting wire even when a metal plate is installed around the circumferential surface of the high-temperature superconducting coil.SOLUTION: In a high temperature superconducting coil 10 including a winding portion 12 around which a high-temperature superconducting wire 20 is wound and a side insulating material 19 that is provided on both sides of the winding portion in the direction of the winding axis, the side insulating material includes a first protrusion 17 extending radially outward and / or radially inward of the high temperature superconducting coil on at least a portion of the outermost circumferential surface and / or the innermost circumferential surface of the high temperature superconducting coil.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] Embodiments of the present invention relate to a high-temperature superconducting coil and a high-temperature superconducting coil device using a high-temperature superconducting wire.

Background Art

[0002] In recent years, research on high-temperature superconducting coils using high-temperature superconducting wires represented by REBCO wires such as (RE)Ba2Cu3O7 containing rare earth (RE) has been actively conducted. In particular, a high-temperature superconducting wire (hereinafter also referred to as a "thin film wire") produced by forming a plurality of types of layers on a substrate having a thickness of about 50 to 100 μm has a characteristic that the current capacity under a high magnetic field is large. Therefore, realization of a high-temperature superconducting coil having a high current density and a high allowable stress required for generating a high magnetic field is expected.

[0003] The forming methods of practically used high-temperature superconducting coils can be roughly classified into several types according to the difference in the winding method of tape-shaped high-temperature superconducting wires. Among these forming methods, there is a method in which a pancake coil-shaped high-temperature superconducting coil wound with a high-temperature superconducting wire in a concentric circle shape is laminated in the winding axis direction to form one high-temperature superconducting coil device.

[0004] In the laminated high-temperature superconducting coils, a metal plate (electrode) is installed so as to straddle adjacent high-temperature superconducting coils on either the inner circumference or the outer circumference of the outermost layer, and they are electrically connected. All the laminated high-temperature superconducting coils are formed into one path through which a superconducting current flows by this metal plate. The tape-shaped high-temperature superconducting wire also has a characteristic that the superconducting characteristics are not lost even when a high external force is applied in the tape longitudinal direction.

[0005] On the other hand, this high-temperature superconducting wire is vulnerable to an external force applied in the stacking direction of the plurality of layers described above, and the superconducting characteristics are easily deteriorated by a minute external force. For example, when a bending stress is locally applied to the high-temperature superconducting wire, layer peeling or layer breakage easily occurs, and the superconducting characteristics are deteriorated.

[0006] Conventionally, methods have been employed to mechanically fix high-temperature superconducting wires by impregnating them with resin. Furthermore, measures have been taken to prevent unnecessary distortion of the high-temperature superconducting wires, such as fixing the electrodes connected to the starting end of the wire to the winding frame. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 6548916 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] In the conventional high-temperature superconducting coil described above, when a metal plate (electrode) is installed on the outermost surface of the high-temperature superconducting coil, the high-temperature superconducting wire (thin film wire) located at the outermost turn of the high-temperature superconducting coil cannot extend radially outward beyond the outermost surface of the side insulating material or other structure that maintains the shape of the high-temperature superconducting coil, in order to avoid interference with the metal plate.

[0009] Furthermore, since it is difficult to adjust the radial ends of these structures to perfectly coincide with the outermost surface of the high-temperature superconducting coil, it becomes necessary to adjust the structures to the inner circumference of the radial ends of the high-temperature superconducting coil in order to reliably avoid interference with the metal plate. Consequently, the strength of the structure that mechanically holds the thin film wire located at the outermost turn becomes lower than the strength of the structure that holds the thin film wire at other turns.

[0010] Thus, because the strength of the structure holding the thin-film wire at the outermost circumference of the high-temperature superconducting coil is low, there is a high risk that when the high-temperature superconducting coil deforms due to external forces or electromagnetic forces, the thin-film wire, especially at the outermost turn, will deform and its properties will deteriorate. Furthermore, a similar problem exists when a metal plate is installed on the innermost surface of the high-temperature superconducting coil.

[0011] The embodiments of the present invention have been made to solve these problems, and aim to provide a high-temperature superconducting coil and a high-temperature superconducting coil device that can reduce the risk of performance degradation due to deformation of thin-film wire even when a metal plate is installed on the circumferential surface of the high-temperature superconducting coil. [Means for solving the problem]

[0012] To solve the above problems, the high-temperature superconducting coil according to this embodiment Device This comprises a winding section around which a high-temperature superconducting wire is wound, and side insulating materials provided on the winding axis axial sides on both sides of the winding section. A high-temperature superconducting coil comprising, and electrodes provided on the outermost and / or innermost circumferential surfaces of the high-temperature superconducting coil, High-temperature superconducting coil having Device In this configuration, the side insulating material has a first projection extending radially outward and / or radially inward of the high-temperature superconducting coil on at least a portion of the outermost and / or innermost circumferential surface of the high-temperature superconducting coil. Furthermore, a notched recess that engages with the first protrusion is provided on the circumferential surface of the electrode. It is characterized by the following: [Effects of the Invention]

[0014] According to embodiments of the present invention, even when a metal plate is installed on the circumferential surface of a high-temperature superconducting coil, the risk of performance degradation due to deformation of the high-temperature superconducting wire can be reduced. [Brief explanation of the drawing]

[0015] [Figure 1] A diagram illustrating the typical configuration of a high-temperature superconducting wire. [Figure 2] A perspective view of a typical high-temperature superconducting coil. [Figure 3] Cross-sectional view along line II-II in Figure 2. [Figure 4] Enlarged view of the Ω region in Figure 3. [Figure 5] Perspective view of a typical high-temperature superconducting coil device with electrodes attached. [Figure 6] Perspective view of a typical high-temperature superconducting coil assembly with stacked high-temperature superconducting coils. [Figure 7] Figure 6 is a plan view of the high-temperature superconducting coil device. [Figure 8] (a) and (b) are enlarged cross-sectional views at position A in FIG. 7, and (c) is an enlarged cross-sectional view at position B in FIG. 7. [Figure 9] (a) to (c) are enlarged cross-sectional views of the high-temperature superconducting coil device according to the first embodiment. [Figure 10] Enlarged cross-sectional view of the high-temperature superconducting coil device according to the second embodiment. [Figure 11] Enlarged cross-sectional view of the high-temperature superconducting coil device according to the third embodiment.

Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the high-temperature superconducting coil and the high-temperature superconducting coil device according to the present invention will be described based on the accompanying drawings.

[0017] (Configuration of High-Temperature Superconducting Wire) First, the configuration of a general high-temperature superconducting wire (thin film wire) 20 will be described using FIG. 1. As shown in FIG. 1, the high-temperature superconducting wire 20 generally has a structure in which tape-shaped thin film layers are laminated.

[0018] The high-temperature superconducting wire 20 includes, for example, a substrate 22 made of a high-strength metal material such as a nickel-based alloy, stainless steel, or copper, an intermediate layer 24 formed on the substrate 22, an orientation layer 23 made of magnesium or the like for orienting the intermediate layer 24 on the surface of the substrate 22, a superconducting layer 25 made of a rare metal oxide such as a REBCO wire formed on the intermediate layer 24, a protective layer 26 composed of silver, gold, or platinum, and a stabilizing layer 21 made of a highly conductive metal such as copper or aluminum.

[0019] The intermediate layer 24 prevents thermal distortion caused by thermal contraction between the substrate 22 and the superconducting layer 25. The protective layer 26 protects the superconducting layer 25 by preventing oxygen contained in the superconducting layer 25 from diffusing from it. The stabilizing layer 21 prevents thermal runaway by acting as a bypass path for excess current supplied to the superconducting layer 25. However, the types and number of layers constituting the high-temperature superconducting wire 20 are not limited to these and may be increased or decreased as needed.

[0020] (High-temperature superconducting coil) Figure 2 is a perspective view showing an example of the configuration of a typical high-temperature superconducting coil 10, and Figure 3 is a cross-sectional view of the coil radial direction B along the line II-II in Figure 2. Figure 4 is an enlarged cross-sectional view of the Ω region in Figure 3.

[0021] The high-temperature superconducting coil 10 shown in Figures 2 and 3 is obtained by winding a high-temperature superconducting wire 20 onto a winding frame 14 to form a pancake-shaped winding section 12 having a space that penetrates the central axis of the winding shaft. A coil formed in a pancake shape by winding a high-temperature superconducting wire 20 concentrically is called a pancake coil.

[0022] Here, as shown in Figure 2, the direction parallel to the winding axis of the high-temperature superconducting coil 10 is called the winding axis direction C, the direction in which the high-temperature superconducting wire 20 is wound is called the coil circumferential direction A, and the direction in which the high-temperature superconducting wire 20 is stacked by winding is called the coil radial direction B. Also, the gap between adjacent turns of high-temperature superconducting wire 20 in the high-temperature superconducting coil 10 is simply called the coil turn interval.

[0023] As shown in Figure 4, an inter-turn insulating material 33 is inserted between adjacent coil turns of the high-temperature superconducting wire 20 to provide insulation between them. Generally, an insulating tape made of polyimide or the like is used as the inter-turn insulating material 33. The tape-shaped inter-turn insulating material 33 is inserted between coil turns by being wound together with the high-temperature superconducting wire 20.

[0024] Furthermore, the high-temperature superconducting coil 10 may be impregnated with an adhesive insulating material such as epoxy resin. By impregnating with an adhesive resin, adjacent high-temperature superconducting wires 20 within the high-temperature superconducting coil 10 are fixed together by the inter-turn insulating material 33, thereby improving the thermal conductivity and mechanical strength of the high-temperature superconducting coil 10.

[0025] In addition, adhesive insulating materials such as epoxy resin can also function as inter-turn insulating material 33 when inserted between coil turns. However, for reliable insulation between coil turns, it is preferable to reliably insulate the coil turns with insulating tape such as polyimide tape.

[0026] Insulating sheets 16 are provided on the upper and lower sides of the winding section 12 to insulate it from other high-temperature superconducting coils adjacent to it. Epoxy resin or fiber-reinforced plastic is preferably used as the insulating sheet 16. Alternatively, an adhesive insulating resin layer 18, such as epoxy resin, may be formed between the winding section 12 and the insulating sheet 16.

[0027] Note that if either the insulating sheet 16 or the insulating resin layer 18 is formed, the winding portion 12 can be insulated from other adjacent superconducting coils, etc. However, as shown in Figure 4, both the insulating sheet 16 and the insulating resin layer 18 may be formed. A component consisting of both or either the insulating sheet 16 and the insulating resin layer 18 is called a side insulating material 19.

[0028] (Single-layer high-temperature superconducting coil device) As part of the high-temperature superconducting coil device 100, when energizing the high-temperature superconducting coil 10, electrodes 40 are connected to the circumferential surface of the high-temperature superconducting wire 20 at the outermost or innermost turn of the winding section 12, as shown in Figure 5. The electrodes 40 are electrically connected to the high-temperature superconducting wire 20 by soldering or the like, and allow the current I flowing through the high-temperature superconducting coil 10 to flow in or out. The electrodes 40 are preferably made of, for example, copper, silver, gold, indium, or alloys thereof.

[0029] (Multilayer high-temperature superconducting coil device) As shown in Figure 6, multiple high-temperature superconducting coils 10 may be stacked concentrically in the winding axis direction to form a multilayer high-temperature superconducting coil device 100.

[0030] The high-temperature superconducting coil apparatus 100 shown in Figure 6 has a metal plate 41 that is installed between two adjacent high-temperature superconducting coils 10, which are stacked. The metal plate 41 is electrically connected to the thin film wire 20 by soldering or the like, and allows the current I flowing out of one of the two installed high-temperature superconducting coils 10 to flow into the other high-temperature superconducting coil 10. The metal plate 41 is preferably made of, for example, copper, silver, gold, indium, or an alloy thereof.

[0031] The difference between the electrode 40 and the metal plate 41 described above is whether they are connected to one high-temperature superconducting coil 10 or connected across two high-temperature superconducting coils 10. Since both are metallic components for allowing current to flow in and out of the high-temperature superconducting coils 10, they can be considered substantially the same. In the embodiments described below, the metal plate 41 is used, but similar effects can be obtained by replacing it with the electrode 40.

[0032] Here, as shown in Figure 7, the circumferential surface where the metal plate (electrode) 41 is provided spanning the two stacked high-temperature superconducting coils 10A and 10B is called region 1, and the circumferential surface where the metal plate 41 is not provided is called region 2.

[0033] Figures 8(a) and 8(b) are enlarged cross-sectional views of region 1 where the metal plate 41 is provided (position A in Figure 7), and Figure 8(c) is an enlarged cross-sectional view of region 2 where the metal plate 41 is not provided (position B in Figure 7).

[0034] In Figures 8(a) to 8(c), each high-temperature superconducting coil 10A and 10B has multiple turns of high-temperature superconducting wire 20 and inter-turn insulating material 33 wound around it, and side insulating material 19 consisting of insulating sheet 16 and insulating resin layer 18 is formed on its upper and lower sides. Figure 8(b) is a cross-sectional view when the radial end of the coil is located radially inward from the radial end of the high-temperature superconducting wire 20A of the outermost turn.

[0035] Furthermore, in Figures 8(a) to (c), 20A refers to the outermost turn of the high-temperature superconducting wire 20, and 20B refers to the turn immediately preceding it. The operation of the general high-temperature superconducting coil device 100 described above will be explained later.

[0036] [First Embodiment] The high-temperature superconducting coil and high-temperature superconducting coil apparatus according to the first embodiment will be explained with reference to Figures 9(a) to (c).

[0037] (composition) Figures 9(a) to 9(c) are enlarged cross-sectional views of a high-temperature superconducting coil device 100A, which consists of two stacked high-temperature superconducting coils 10A and 10B. Both are enlarged cross-sectional views of the area where a metal plate (electrode) 41 is attached across the two high-temperature superconducting coils 10A and 10B (see position A in Figure 7).

[0038] As shown in Figure 9(a), the high-temperature superconducting coil device 100A according to this first embodiment is provided with a side insulating material 19 consisting of an insulating sheet 16 and an insulating resin layer 18 on the surface where the two high-temperature superconducting coils 10A and 10B are stacked, and the side insulating material 19 has a first projection 17 that extends outward in the radial direction of the coil, and the first projection 17 fits into a notched recess 45 formed on the inner circumference of the metal plate 41.

[0039] In the example shown in Figure 9(a), the first protrusion 17 is fitted into the notched recess 45 with virtually no gap. However, the shapes of the first protrusion 17 and the notched recess 45 do not need to perfectly match. As shown in Figure 9(b), the size of the first protrusion 17 in the coil radial direction may be made smaller than the size of the notched recess 45 in the coil radial direction to form a predetermined gap. Furthermore, as shown in Figure 9(c), the notched recess 45 may be formed such that a predetermined gap is created between it and the first protrusion 17 in the coil axial direction.

[0040] What is important here is that the first projection 17 extends radially outward from the position of the high-temperature superconducting wire 20A at the outermost turn, and the metal plate 41 has a notched recess 45 formed in a shape that does not interfere with the first projection 17.

[0041] Specifically, the thickness of the high-temperature superconducting wire 20 is approximately 0.1 mm to 0.2 mm, and the thickness of the inter-turn insulating material 33 is approximately 0.03 mm to 0.1 mm. Therefore, the radial size per turn of a typical high-temperature superconducting coil 10 is approximately 0.1 mm to 0.3 mm.

[0042] Therefore, in order to provide a first projection 17 with a size equivalent to one turn on the outer circumference of the thin film wire 20A, it is desirable that the size of the first projection 17 in the coil radial direction be 0.1 mm or more, and more preferably 0.3 mm or more.

[0043] On the other hand, although there is no upper limit to the size of the first protrusion 17 in the coil radial direction, if it is made unnecessarily large, the size of the notched recess 45 in the coil radial direction must also be increased accordingly, unnecessarily narrowing the cross-sectional area of ​​the metal plate 41 and increasing the electrical resistance of the metal plate 41. It is also conceivable to increase the size of the metal plate 41 in the coil radial direction in order to increase the cross-sectional area of ​​the metal plate 41, but this would lead to increased costs for the metal plate 41 and an overall increase in the size of the device. Therefore, it is preferable to set the size of the first protrusion 17 in the coil radial direction to a value smaller than the radial size of the metal plate 41.

[0044] Specifically, since a thickness of approximately 1 mm to 5 mm in the coil radial direction of the metal plate 41 is generally sufficient, it is desirable that the size of the first protrusion 17 in the coil radial direction be 1 mm or less, more preferably 0.5 mm or less.

[0045] The first protrusion 17 is provided on a part of the circumferential surface of the high-temperature superconducting coils 10A and 10B, but it may also be formed around the entire circumference of the high-temperature superconducting coil 10. If the first protrusion 17 is formed around the entire circumference of the high-temperature superconducting coil 10, after forming the first protrusion 17, the size of only the first protrusion 17 in region 1 (see Figure 7) may be adjusted to be smaller in the coil radial direction in order to fit into the notched recess 45, so that the size of the first protrusion 17 in region 1 in the coil radial direction is smaller than the size of the first protrusion 17 in region 2 (see Figure 7) in the coil radial direction.

[0046] Furthermore, the first protrusion may be formed around the entire circumference of region 1 with the same dimensions as the first protrusion, or the first protrusion may be formed only in region 1.

[0047] (action) First, using Figures 8(a) to 8(c), we will explain the operation of a conventional high-temperature superconducting coil device 100, which consists of two stacked high-temperature superconducting coils 10A and 10B.

[0048] Figure 8(a) is an enlarged cross-sectional view of the section where the metal plate 41 is installed (position A in Figure 7), where the radial ends of the coil of the side insulating material 19, which consists of an insulating sheet 16 and an insulating resin layer 18, and the radial ends of the coil of the high-temperature superconducting wire 20A at the outermost turn are aligned at the same position in the radial direction.

[0049] In this configuration, the outermost turn of the high-temperature superconducting wire 20A lacks the side insulating material 19 on its radially outer side. As a result, it has lower mechanical strength compared to the high-temperature superconducting wire 20B of the previous turn, and there is a high risk of deformation such as bending or twisting due to electromagnetic force or thermal stress. Furthermore, instead of the next turn being located radially outside the high-temperature superconducting wire 20A, a metal plate 41 is installed by soldering or other means. While this improves mechanical strength, it does not reduce the risk of deformation due to thermal stress generated during the soldering of the metal plate 41.

[0050] Figure 8(b) is a cross-sectional view at position A in Figure 7, where the radial end of the side insulating material 19 is located radially inward from the radial end of the high-temperature superconducting wire 20A of the outermost turn.

[0051] In order to maximize the strength for holding the high-temperature superconducting wire 20 while avoiding interference between the metal plate 41 and the side insulating material 19, it is desirable that the radial position of the coil radial end of the side insulating material 19 and the coil radial end of the outermost turn of the high-temperature superconducting wire 20A be aligned, as shown in Figure 8(a). However, in order to reliably avoid interference between the metal plate 41 and the side insulating material 19, in practice, the coil radial end of the side insulating material 19 must be adjusted so that it is positioned at least slightly further inward than the coil radial end of the high-temperature superconducting wire 20A. In this case as well, the cross-sectional area of ​​the side insulating material 19 that holds the high-temperature superconducting wire 20 becomes even smaller than in Figure 8(a), resulting in an even greater decrease in mechanical strength compared to the case in Figure 8(a).

[0052] Figure 8(c) is an enlarged cross-sectional view of the high-temperature superconducting coils 10A and 10B in the portion where the metal plate 41 is not installed (position B in Figure 7). In principle, it is possible to form the first protrusion 17 at position B, but in order to reliably avoid interference with the metal plate 41, there must be a region where no protrusion is formed, extending at least 1 mm from the circumferential end of the metal plate 41.

[0053] Therefore, as shown in Figure 8(c), there are small sections where the first protrusion 17 is not formed and the metal plate 41 is not installed. In such places, the mechanical strength improvement effect achieved by installing the metal plate 41 by soldering or the like, as described above, cannot be expected, and the mechanical strength will be even lower than in the case of Figure 8(a).

[0054] Next, the operation of the high-temperature superconducting coil device 100A according to this first embodiment will be described. In this first embodiment, as shown in Figures 9(a) to 9(c), the radial end of the side insulating material 19 extends radially outward from the high-temperature superconducting wire 20A to form the first protrusion 17. Therefore, when electromagnetic force or thermal stress is applied to the outermost turn of the high-temperature superconducting wire 20A, the force holding the high-temperature superconducting wire 20 becomes larger compared to the conventional high-temperature superconducting coil device 100 shown in Figure 8(a).

[0055] Furthermore, since the metal plate 41 has a notched recess 45 that fits with the first protrusion 17, the metal plate 41 can be attached to the high-temperature superconducting wire 20 without interfering with the first protrusion 17.

[0056] Furthermore, as shown in Figure 9(a), if the size of the first protrusion 17 in the coil axis direction is formed to be approximately the same as the size of the notched recess 45 in the axial direction, and the assembly is made such that the surface of the first protrusion 17 perpendicular to the coil axis direction substantially coincides with the surface of the notched recess 45 perpendicular to the coil axis direction, then it can be expected that the force holding the high-temperature superconducting wire 20A will be further strengthened by suppressing the displacement of the side insulating material 19 in the coil axis direction.

[0057] Furthermore, as mentioned above, if the size of the first protrusion 17 in the coil radial direction in region 1 of Figure 7 is too large, there is a disadvantage that the size of the notched recess 45 in the coil radial direction will also increase, so it is necessary to adjust it to an appropriate size. However, there is no such disadvantage in region 2, so the size of the first protrusion 17 in the coil radial direction may be made larger than in region 1. This ensures sufficient strength to hold the high-temperature superconducting wire 20 in region 2.

[0058] Furthermore, the high-temperature superconducting coil device 100A shown in Figures 9(b) and (c) also performs the same function as described above. In addition, by providing a predetermined gap between the first protrusion 17 and the notched recess 45 in the coil axial direction and / or radial direction, thermal expansion can be absorbed, and a margin of error during assembly can be provided.

[0059] (effect) As described above, according to this first embodiment, by providing a first projection 17 on the side insulating material 19 of the high-temperature superconducting coils 10A and 10B that can be fitted into a notched recess 45 provided on the inner circumference of the metal plate 41, deformation when electromagnetic force or thermal stress is applied to the high-temperature superconducting wire 20 can be suppressed, and the risk of deterioration of the characteristics of the high-temperature superconducting wire 20 can be reduced.

[0060] [Second Embodiment] A high-temperature superconducting coil and a high-temperature superconducting coil device according to the second embodiment will be described with reference to Figure 10. Components identical or similar to those in the first embodiment are denoted by the same reference numerals, and redundant explanations are omitted.

[0061] In the high-temperature superconducting coil device 100A according to the second embodiment, as shown in Figure 10, the first projection 17 of the side insulating material 19 extends in the direction of the coil axis and has a second projection 27 formed along the radially outer surface of the outermost turn high-temperature superconducting wire 20A.

[0062] This structure can be obtained, for example, by forming an insulating resin layer 18 along the radially outer surface of the high-temperature superconducting wire 20A. The larger the size of the second protrusion 27 in the coil axis direction, the larger the bonding area between the first protrusion 17 and the high-temperature superconducting wire 20A can be, but the area of ​​the bonding surface between the high-temperature superconducting wire 20A and the metal plate 41 becomes smaller.

[0063] Therefore, it is necessary to set the dimensions within a range that does not significantly hinder the adhesion between the high-temperature superconducting wire 20A and the metal plate 41. Specifically, while the width of a typical high-temperature superconducting wire 20 is about 2 mm to 12 mm, for example, in the case of a high-temperature superconducting wire 20A with a width of 4 mm, the size of the second protrusion 27 in the coil axial direction is preferably about 0.2 mm to 1 mm, and more preferably about 0.2 mm to 0.5 mm.

[0064] According to this second embodiment, in addition to the effects of the first embodiment, the second protrusion 27 holds a part of the outer peripheral surface of the high-temperature superconducting wire 20A in the coil radial direction, thereby further enhancing the effect of holding the outermost turn of the high-temperature superconducting wire 20A. This makes it possible to suppress deformation of the high-temperature superconducting wire 20A when electromagnetic force or thermal stress is applied, compared to conventional examples, thereby reducing the risk of degradation of the high-temperature superconducting wire 20A's properties.

[0065] [Third Embodiment] A high-temperature superconducting coil and a high-temperature superconducting coil device according to the third embodiment will be described with reference to Figure 11. Components identical or similar to those in the above embodiments are denoted by the same reference numerals, and redundant explanations are omitted.

[0066] In the high-temperature superconducting coil device 100A according to the third embodiment, as shown in Figure 11, a conductive spacer 30 is placed between the radially outer surface of the outermost turn of the high-temperature superconducting wire 20A and the metal plate 41.

[0067] The conductive spacer 30 is positioned to eliminate the difference in radial size between the two high-temperature superconducting coils 10A and 10B on which the metal plate 41 is mounted, when their radial sizes are different. The conductive spacer is preferably made of copper, silver, gold, indium, or alloys thereof. The size W0 of the conductive spacer 30 in the coil axial direction is preferably about the same as the size W1 of the high-temperature superconducting wire 20.

[0068] Furthermore, as shown in Figure 10, if a second protrusion 27 is present, the size of the second protrusion 27 in the coil axial direction is W2, and the size W0 of the conductive spacer 30 in the coil axial direction may be W0 = W1 - W2 (when the second protrusion 27 is formed only on one side in the width direction of the thin film wire 20A) or W0 = W1 - W2 × 2 (when the second protrusion 27 is formed on both sides in the width direction of the thin film wire 20A).

[0069] Furthermore, it is preferable that the size of the conductive spacer 30 in the circumferential direction of the coil be larger than or about the same as the size of the metal plate 41 in the circumferential direction of the coil. In addition, the conductive spacer 30 may be formed by dividing it radially.

[0070] According to this third embodiment, the effects of the above embodiment can be obtained even when the radial heights of adjacent high-temperature superconducting coils 10A and 10B are different. This makes it possible to suppress deformation of the outermost high-temperature superconducting wire 20A when electromagnetic force or thermal stress is applied, compared to conventional examples, thereby reducing the risk of performance degradation of the high-temperature superconducting wire 20A.

[0071] (modified version) In the first to third embodiments described above, an example was given in which the first protrusion 17 is extended radially outward from the high-temperature superconducting coil 10. However, if the metal plate (electrode) 41 is provided on the innermost circumferential surface of the high-temperature superconducting coil 10, the first protrusion 17 may be extended radially inward from the high-temperature superconducting coil 10. This configuration and its effects are the same as in the first to third embodiments, so a further explanation is omitted.

[0072] While embodiments of the present invention have been described above, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, and combinations are possible without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents.

[0073] For example, in the above embodiment, a circular high-temperature superconducting coil was used as an example of the coil shape, but the applicable winding section is not limited to a circular pancake coil, and can also be applied to non-circular shaped coils such as saddle-shaped or elliptical coils. [Explanation of symbols]

[0074] 10, 10A, 10B... High-temperature superconducting coil, 12... Winding section, 14... Winding frame, 15... Normal conducting section, 16... Insulating sheet, 17... First protrusion, 18... Insulating resin layer, 19... Side insulating material, 20, 20A, 20B... High-temperature superconducting wire (thin film wire), 21... Stabilizing layer, 22... Substrate, 23... Orientation layer, 24... Intermediate layer, 25... High-temperature superconducting layer, 26... Protective layer, 27... Second protrusion, 30... Conductive spacer, 33... Inter-turn insulating material, 40... Electrode, 41... Metal plate (electrode), 45... Notched recess, 100, 100A... High-temperature superconducting coil device

Claims

1. A high-temperature superconducting coil device comprising a high-temperature superconducting coil consisting of a winding portion around which a high-temperature superconducting wire is wound, and side insulating materials provided on the winding axis axial sides on both sides of the winding portion, and electrodes provided on the outermost and / or innermost circumferential surfaces of the high-temperature superconducting coil, The high-temperature superconducting coil device is characterized in that the side insulating material has a first projection extending radially outward and / or radially inward of the high-temperature superconducting coil on at least a portion of the outermost circumferential surface and / or innermost circumferential surface of the high-temperature superconducting coil, and the electrode circumferential surface is provided with a notched recess that fits with the first projection.

2. The high-temperature superconducting coil device according to claim 1, comprising a plurality of stacked high-temperature superconducting coils and an electrode provided spanning the outermost and / or innermost circumferential surfaces of adjacent high-temperature superconducting coils, wherein a first projection of a side insulating material in contact with the plurality of high-temperature superconducting coils fits into a notched recess formed on the circumferential surface of the electrode.

3. The high-temperature superconducting coil device according to claim 1 or 2, characterized in that when the side insulating material is fitted into the notched recess, a predetermined air gap is formed in the radial and / or axial direction.

4. The high-temperature superconducting coil device according to claim 1 or 2, characterized in that the first protrusion is provided with a second protrusion extending in the winding axis direction.

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