Superconducting coil

Abstract

To provide a superconducting coil capable of suppressing a delay of a generated magnetic field at the time of excitation / demagnetization.SOLUTION: A superconducting coil 100 comprises a winding part 30 to which a superconducting wire rod 10 is wound. The winding part 30 includes: end part conductive regions 21 and 22 surround by two or more times from at least one end of the superconducting wire rod 10 as a starting point; and an insulation region 23 communicated with the end part conductive regions 21 and 22. End regions 10A and 10B containing the end can be connected to connected parts 25 and 35. The end part conductive regions 21 and 22 are relatively conductively contacted to the superconducting wire rod 10 adjacent to a radial direction of the winding part 30 over the whole length. In the insulation region 23, the insulation material is interposed between both the adjacent superconducting wire rods 10 to the radial direction of the winding part 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a superconducting coil. [Background technology]

[0002] The superconducting coil described in Patent Document 1 includes a superconducting wire wound around a bobbin. In this superconducting coil, an insulating material is partially inserted between the wound superconducting wire. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6491331 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned superconducting coil, there is a possibility that a delay in the generated magnetic field may occur during excitation and demagnetization.

[0005] An object of one embodiment of the present invention is to provide a superconducting coil capable of suppressing delay in a generated magnetic field during excitation and demagnetization. [Means for solving the problem]

[0006] One aspect of the present invention provides a superconducting coil comprising a winding portion around which a superconducting wire is wound, the winding portion having an end conductive region that wraps around the superconducting wire two or more times starting from at least one end of the superconducting wire, and an insulating region that is continuous with the end conductive region, the end region including the end being electrically connectable to a connected portion, the end conductive region being such that adjacent superconducting wires in a radial direction of the winding portion are in conductive contact with each other, and the insulating region being such that an insulating material is interposed between adjacent superconducting wires in a radial direction of the winding portion.

[0007] According to this configuration, since radially adjacent superconducting wires have end conductive regions in which they contact each other to be conductive, even if the superconducting layer at the terminal portion of the superconducting wire is damaged and the superconducting characteristics are reduced, the conductivity between the radially adjacent superconducting wires can be ensured and overcurrent can be bypassed. Therefore, the superconducting coil can be protected. Since the superconducting coil has end conductive regions, the length of the superconducting wire in the insulating region can be sufficiently ensured. Therefore, the delay in the generated magnetic field during excitation and demagnetization can be suppressed.

[0008] It is preferable that the superconducting wire has an intermediate connection portion in which a pair of wire bodies having connection ends are connected to each other, and the winding portion further has an intermediate conductive region that turns one or more times around each of the connection ends of the pair of wire bodies as a starting point.

[0009] The number of turns of the superconducting wire in the end conductive region is preferably 5 or less.

[0010] It is preferable that the length of the superconducting wire in the end conductive region is 1% or less of the length of the superconducting wire in the winding portion. Effect of the Invention

[0011] According to one aspect of the present invention, it is possible to provide a superconducting coil capable of suppressing delay in the generated magnetic field during excitation and demagnetization. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a front view of the superconducting coil of the first embodiment. [Diagram 2] FIG. 2 is a diagram illustrating a first end conduction region of the superconducting coil of the first embodiment. [Diagram 3] 1 is a cross-sectional view of an oxide superconducting wire used in a superconducting coil of a first embodiment. [Figure 4] 3 is a cross-sectional view of a portion of a first end conduction region of the superconducting coil of the first embodiment. FIG. [Diagram 5]3 is a diagram illustrating a schematic diagram of a second end conduction region of the superconducting coil of the first embodiment. FIG. [Figure 6] 4 is a cross-sectional view of a portion of a second end conduction region of the superconducting coil of the first embodiment. FIG. [Figure 7] 1 is a perspective view showing a schematic structure of a superconducting coil according to a first embodiment. [Figure 8] FIG. 11 is a front view of a superconducting coil according to a second embodiment. [Figure 9] FIG. 11 is a diagram showing a schematic diagram of an intermediate conduction region of a superconducting coil according to a second embodiment. [Figure 10] 11 is a cross-sectional view of a portion of an intermediate conductive region of a superconducting coil according to a second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

[0014] [Superconducting coil] (First embodiment) FIG. 1 is a front view of a superconducting coil 100 of a first embodiment. FIG. 2 is a diagram showing a first end conduction region 21 of the superconducting coil 100. FIG. 3 is a cross-sectional view of an oxide superconducting wire 10 used in the superconducting coil 100. FIG. 4 is a cross-sectional view of a portion of the first end conduction region 21 of the superconducting coil 100. FIG. 5 is a diagram showing a second end conduction region 22 of the superconducting coil 100. FIG. 6 is a cross-sectional view of a portion of the second end conduction region 22 of the superconducting coil 100. FIG. 7 is a perspective view showing a schematic structure of the superconducting coil 100.

[0015] As shown in FIG. 1, superconducting coil 100 includes a plurality of winding portions 30 (see FIG. 7). The winding section 30 is composed of an oxide superconducting wire 10 (superconducting wire). The winding section 30 is a multi-layer wound coil in which the oxide superconducting wire 10 is wound multiple times around a winding core. "C" is the winding axis of the winding section 30. The winding section 30 is, for example, an annular pancake coil. The direction around the winding axis C is the circumferential direction of the winding section 30. The winding section 30 may be configured such that the oxide superconducting wire 10 and an insulating tape are wound together. The winding section 30 may be impregnated with a resin such as an epoxy resin. The multiple winding portions 30 are stacked in the direction of the winding axis C (see FIG. 7).

[0016] As shown in Fig. 3, the oxide superconducting wire 10 includes a superconducting laminate 5 and a stabilization layer 6. The oxide superconducting wire 10 is a specific example of a "superconducting wire".

[0017] The superconducting laminate 5 includes a metal substrate 1, an intermediate layer 2, an oxide superconducting layer 3, and a protective layer 4. The superconducting laminate 5 has a structure in which the oxide superconducting layer 3 and the protective layer 4 are formed on the metal substrate 1 via the intermediate layer 2. That is, the superconducting laminate 5 has a configuration in which the intermediate layer 2, the oxide superconducting layer 3, and the protective layer 4 are laminated in this order on one surface of the tape-shaped metal substrate 1.

[0018] The oxide superconducting wire 10 is formed in a tape shape. The Y direction is the thickness direction of the oxide superconducting wire 10, and is the direction in which the metal substrate 1, the intermediate layer 2, the oxide superconducting layer 3, and the protective layer 4 are laminated. The X direction is the width direction of the oxide superconducting wire 10, and is a direction perpendicular to the length direction and thickness direction of the oxide superconducting wire 10.

[0019] The metal substrate 1 is made of a metal. Specific examples of the metal constituting the metal substrate 1 include nickel alloys such as Hastelloy (registered trademark); stainless steel; and oriented Ni-W alloys in which a texture is introduced into a nickel alloy. The thickness of the metal substrate 1 may be appropriately adjusted depending on the purpose, and is, for example, in the range of 10 to 500 μm. One surface of the metal substrate 1 (the surface on which the intermediate layer 2 is formed) is referred to as a first main surface 1a, and the surface opposite to the first main surface 1a is referred to as a second main surface 1b.

[0020] The intermediate layer 2 is provided between the metal substrate 1 and the oxide superconducting layer 3. The intermediate layer 2 is formed on the first main surface 1a of the metal substrate 1. The intermediate layer 2 may have a multi-layer structure, and may have, for example, a diffusion prevention layer, a bed layer, an orientation layer, a cap layer, etc., in this order from the metal substrate 1 side to the oxide superconducting layer 3 side. These layers are not necessarily provided one by one, and some layers may be omitted, or two or more layers of the same type may be repeatedly laminated. Note that the intermediate layer 2 is not an essential component of the oxide superconducting wire 10, and if the metal substrate 1 itself has orientation, the intermediate layer 2 may not be formed.

[0021] The diffusion prevention layer has a function of preventing some of the components of the metal substrate 1 from diffusing and being mixed as impurities into the oxide superconducting layer 3. The diffusion prevention layer is made of, for example, Si3N4, Al2O3, GZO (Gd2Zr2O7), etc. The thickness of the diffusion prevention layer is, for example, 10 to 400 nm.

[0022] A bed layer may be formed on the diffusion prevention layer in order to reduce the reaction at the interface between the metal substrate 1 and the oxide superconducting layer 3 and to improve the orientation of the layer formed thereon. Examples of materials for the bed layer include Y2O3, Er2O3, CeO2, Dy2O3, Eu2O3, Ho2O3, and La2O3. The thickness of the bed layer is, for example, 10 to 100 nm.

[0023] The orientation layer is formed from a biaxially oriented material to control the crystal orientation of the cap layer thereon. Examples of materials for the orientation layer include metal oxides such as Gd2Zr2O7, MgO, ZrO2-Y2O3 (YSZ), SrTiO3, CeO2, Y2O3, Al2O3, Gd2O3, Zr2O3, Ho2O3, and Nd2O3. The orientation layer is preferably formed by IBAD (Ion-Beam-Assisted Deposition).

[0024] The cap layer is formed on the surface of the above-mentioned orientation layer and is made of a material that allows crystal grains to self-orient in the in-plane direction. Examples of materials for the cap layer include CeO2, Y2O3, Al2O3, Gd2O3, ZrO2, YSZ, Ho2O3, Nd2O3, and LaMnO3. The thickness of the cap layer is in the range of 50 to 5000 nm.

[0025] The oxide superconducting layer 3 is made of an oxide superconductor. The oxide superconductor is not particularly limited, but for example, the oxide superconductor represented by the general formula REBa2Cu3O X The RE-Ba-Cu-O oxide superconductor (REBCO oxide superconductor) represented by (RE123) can be used. The rare earth element RE can be one or more of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. Among them, one of Y, Gd, Eu, and Sm, or a combination of two or more of these elements is preferred. In general, X is 7-x (oxygen deficiency amount x: about 0 to 1). The oxide superconducting layer 3 has a thickness of, for example, about 0.5 to 5 μm. This thickness is preferably uniform in the longitudinal direction. The oxide superconducting layer 3 is formed on the main surface 2a of the intermediate layer 2 (the surface opposite to the metal substrate 1).

[0026] The protective layer 4 has functions such as bypassing an overcurrent that occurs in the event of an accident and suppressing a chemical reaction that occurs between the oxide superconducting layer 3 and a layer provided on the protective layer 4. Examples of materials for the protective layer 4 include silver (Ag), copper (Cu), gold (Au), an alloy of gold and silver, other silver alloys, copper alloys, and gold alloys. The protective layer 4 covers at least the main surface 3a (the surface opposite to the intermediate layer 2) of the oxide superconducting layer 3. The thickness of the protective layer 4 is not particularly limited, but may be, for example, about 1 to 30 μm.

[0027] Reference numeral 5a denotes a first main surface of the superconducting laminate 5 (main surface 4a of protective layer 4). The first main surface 5a is the surface of the superconducting laminate 5 on which the oxide superconducting layer 3 is formed. Reference numeral 5b denotes a side surface of the superconducting laminate 5 (the side surface of the metal substrate 1, the side surface of the intermediate layer 2, the side surface of the oxide superconducting layer 3, and the side surface of the protective layer 4). Reference numeral 5c denotes a second main surface of the superconducting laminate 5 (second main surface 1b of the metal substrate 1), which is the surface opposite to the first main surface 5a. The second main surface 5c is the surface of the superconducting laminate 5 on which the metal substrate 1 is formed.

[0028] The stabilization layer 6 covers the first main surface 5a, the side surfaces 5b, 5b and the second main surface 5c of the superconducting laminate 5. The stabilization layer 6 is formed to surround the superconducting laminate 5. The stabilization layer 6 functions as a bypass section that diverts an overcurrent that is generated when the oxide superconducting layer 3 transitions to a normal conducting state. Examples of materials constituting the stabilization layer 6 include metals such as copper, copper alloys (e.g., Cu-Zn alloys, Cu-Ni alloys, etc.), aluminum, aluminum alloys, silver, etc. The thickness of the stabilization layer 6 is, for example, about 10 to 300 μm. The stabilization layer 6 can be formed by plating (e.g., electrolytic plating).

[0029] In winding portion 30 (see FIG. 1), oxide superconducting wire 10 is desirably wound with metal substrate 1 facing the outer periphery and oxide superconducting layer 3 facing the inner periphery.

[0030] As shown in Fig. 1, the winding section 30 is composed of oxide superconducting wire 10 wound n times (n is an integer equal to or greater than 6, for example). The winding section 30 has n winding portions. These winding portions are referred to as a first winding portion 31, a second winding portion 32, a third winding portion 33 (see Fig. 4), ... an n-2th winding portion 43 (see Fig. 6), an n-1th winding portion 42, and an nth winding portion 41, from the inner circumference side to the outer circumference side.

[0031] The winding portion 30 includes a first end conductive region 21, a second end conductive region 22, and an insulating region 23. The first end conductive region 21 and the second end conductive region 22 are specific examples of "end conductive regions." The insulating region is also called a non-conducting region.

[0032] 1 and 2, first end conduction region 21 is a region that includes inner circumferential end 10a of oxide superconducting wire 10. Inner circumferential end 10a is one end of oxide superconducting wire 10 that constitutes winding portion 30.

[0033] As shown in FIG. 2, the first end conductive region 21 is made of the oxide superconducting wire 10 that is wound around the inner circumferential end 10a twice. The first end conductive region 21 has a first winding portion 31 and a second winding portion 32. The first winding portion 31 is a portion that extends from the inner circumferential end 10a, turns once, and reaches a first intermediate point 31a that overlaps with the inner circumferential end 10a when viewed from the radial direction. The second winding portion 32 is a portion that extends from the first intermediate point 31a, turns once, and reaches a second intermediate point 32a that overlaps with the first intermediate point 31a when viewed from the radial direction. The second winding portion 32 is overlapped on the outer circumferential surface of the first winding portion 31. The first winding portion 31 and the second winding portion 32 are adjacent to each other in the radial direction of the winding portion 30.

[0034] Of the first winding portion 31, an end region 10A including the inner circumferential end 10a can be connected to a sheet-like connected portion 25. The connected portion 25 is a connector or an electrode connected to another winding portion 30. The connected portion 25 is formed of a conductor such as a metal. The inner circumferential surface of the end region 10A is joined to one surface of the connected portion 25 by a bonding material 26 such as solder (see FIG. 4), and is electrically connected to the connected portion 25.

[0035] 4, the oxide superconducting wire 10 of the first winding portion 31 and the oxide superconducting wire 10 of the second winding portion 32 are in contact with each other over the entire length. The first winding portion 31 and the second winding portion 32 are electrically conductive.

[0036] 1 and 5, second end conduction region 22 is a region that includes outer peripheral end 10b of oxide superconducting wire 10. Outer peripheral end 10b is the other end of oxide superconducting wire 10 that constitutes winding portion 30.

[0037] As shown in FIG. 5, the second end conductive region 22 is made of the oxide superconducting wire 10 that turns twice around the outer peripheral end 10b. The second end conductive region 22 has an n-th turn portion 41 and an n-1-th turn portion 42. The n-th turn portion 41 is a portion that extends from the outer peripheral end 10b, turns once, and reaches a first intermediate point 41a that overlaps with the outer peripheral end 10b when viewed from the radial direction. The n-1-th turn portion 42 is a portion that extends from the first intermediate point 41a, turns once, and reaches a second intermediate point 42a that overlaps with the first intermediate point 41a when viewed from the radial direction. The n-1-th turn portion 42 is overlapped on the inner peripheral surface of the n-th turn portion 41. The n-th turn portion 41 and the n-1-th turn portion 42 are adjacent to each other in the radial direction of the winding portion 30.

[0038] Of the nth winding portion 41, an end region 10B including the outer circumferential end 10b can be connected to a sheet-shaped connected portion 35. The connected portion 35 is a connector or an electrode connected to another winding portion 30. The connected portion 35 is formed of a conductor such as a metal. The outer circumferential surface of the end region 10B is joined to one surface of the connected portion 35 by a bonding material 26 such as solder (see FIG. 6 ), and is electrically connected to the connected portion 35.

[0039] 6, the oxide superconducting wire 10 of the n-th turn portion 41 and the oxide superconducting wire 10 of the n-1-th turn portion 42 are in contact with each other over the entire length. Therefore, the n-th turn portion 41 and the n-1-th turn portion 42 can be electrically connected to each other.

[0040] The length of oxide superconducting wire 10 in first end conduction region 21 and second end conduction region 22 is desirably 1% or less of the length of oxide superconducting wire 10 constituting winding portion 30. When the length ratio of the oxide superconducting wire 10 in the end conductive regions 21, 22 to the oxide superconducting wire 10 is 1% or less, the length of the oxide superconducting wire 10 in the insulating region 23 can be sufficiently secured, thereby suppressing delay in the generated magnetic field during excitation and demagnetization.

[0041] 4 and 6, insulating region 23 is made of oxide superconducting wire 10 from third winding portion 33 to n-2th winding portion 43. An insulating material 60 (spacer) is interposed between adjacent winding portions among third winding portion 33 to n-2th winding portion 43. Insulating material 60 is formed, for example, in a sheet shape and is made of an insulating material such as a resin such as polyimide.

[0042] As shown in Fig. 4, an insulating material 60 is interposed between the third winding portion 33 and the fourth winding portion 34 over the entire length of the winding portions 33, 34. As shown in Fig. 6, an insulating material 60 is interposed between the n-3th winding portion 44 and the n-2th winding portion 43 over the entire length of the winding portions 43, 44. Therefore, in the insulating region 23, oxide superconducting wires 10 adjacent to each other in the radial direction of the winding portion 30 are not electrically connected in the radial direction.

[0043] 4, an insulating material 60 is interposed between the outermost winding portion (second winding portion 32) of the first end conductive region 21 and the innermost winding portion (third winding portion 33) of the insulating region 23 over the entire length of the winding portions 32, 33. Therefore, the second winding portion 32 and the third winding portion 33 are not electrically connected in the radial direction. 6, an insulating material 60 is interposed between the outermost turn portion (the n-2th turn portion 43) of the insulating region 23 and the innermost turn portion (the n-1th turn portion 42) of the second end conductive region 22 over the entire length of the turn portions 42, 43. Therefore, the n-2th turn portion 43 and the n-1th turn portion 42 are not electrically connected in the radial direction.

[0044] Insulating region 23 is formed by oxide superconducting wire 10 continuing from first end conduction region 21 and second end conduction region 22 .

[0045] When the connected parts 25, 35 are connectors connected to other winding parts 30, the oxide superconducting wire 10 is connected to the other winding parts 30 (for example, the winding parts 30 adjacent in the stacking direction in FIG. 7) via the connected parts 25, 35. When the connected parts 25, 35 are electrodes, the oxide superconducting wire 10 can pass electricity via these electrodes.

[0046] [Effects of the superconducting coil according to the first embodiment] When a large current is passed through the superconducting coil 100, an electromagnetic force is applied to the superconducting coil 100 in the radially outward direction, which may cause a tensile force to act on the oxide superconducting wire 10. Therefore, at the terminals where the connected parts 25, 35 and the oxide superconducting wire 10 are connected, there is a possibility that a large stress is applied to the oxide superconducting layer 3 of the oxide superconducting wire 10.

[0047] The superconducting coil 100 has a first end conductive region 21 and a second end conductive region 22 where radially adjacent oxide superconducting wires 10 contact each other to allow electrical continuity. Therefore, even if the oxide superconducting layer 3 at the end portion is damaged by the above-mentioned tensile force and the superconducting properties of the oxide superconducting wire 10 are reduced, electrical continuity between the radially adjacent oxide superconducting wires 10 can be ensured and an overcurrent can be bypassed. Therefore, the superconducting coil 100 can be protected. Since superconducting coil 100 includes end conductive regions 21 and 22, it is possible to ensure a sufficient length of oxide superconducting wire 10 in insulating region 23. This makes it possible to suppress delay in the generated magnetic field during excitation and demagnetization.

[0048] The first end conductive region 21 (see FIG. 2) and the second end conductive region 22 (see FIG. 5) are each formed of two turns of oxide superconducting wire 10, but the number of turns of the superconducting wire constituting the end conductive region is not particularly limited. The number of turns of the superconducting wire constituting the end conductive region is preferably two or more and five or less. By having two or more turns, sufficient conduction between adjacent superconducting wires in the end conductive region can be ensured. By having five or less turns, a sufficient length can be provided for oxide superconducting wire 10 in insulating region 23. Thus, delay in the generated magnetic field can be suppressed.

[0049] [Superconducting coil] (Second embodiment) Fig. 8 is a front view of a superconducting coil 200 of the second embodiment. Fig. 9 is a schematic diagram of an intermediate conduction region 24 of the superconducting coil 200. Fig. 10 is a cross-sectional view of a portion of the intermediate conduction region 24 of the superconducting coil 200. Configurations common to the first embodiment are given the same reference numerals and description thereof will be omitted.

[0050] As shown in Fig. 8, superconducting coil 200 includes winding section 130 instead of winding section 30 (see Fig. 1). Winding section 130 is made of oxide superconducting wire 110 (superconducting wire).

[0051] The winding portion 130 includes a first end conductive region 21, a second end conductive region 22, an insulating region 23, and an intermediate conductive region 24. The winding portion 130 differs from the winding portion 30 shown in FIG.

[0052] In the oxide superconducting wire 110, two wire bodies 111 (a pair of wire bodies) are connected to each other via a connector 112. A portion where the wire bodies 111 are connected to each other via the connector 112 is referred to as an intermediate connection portion 113. The wire bodies 111 and the connector 112 may have a configuration similar to that of the oxide superconducting wire 10 (see FIG. 3), for example. The two wire bodies 111 are arranged with their connection ends 111a facing each other. The connector 112 is joined to one surface of each of the two wire bodies 111, and is electrically connected to these wire bodies 111. Therefore, the two wire bodies 111 are electrically connected to each other via the connector 112. Of the two wire bodies 111, the wire body 111 on the inner periphery is referred to as a first wire body 111A. Of the two wire bodies 111, the wire body 111 on the outer periphery is referred to as a second wire body 111B.

[0053] As shown in FIG. 9, the intermediate conductive region 24 consists of an oxide superconducting wire 110 that wraps around the inner circumference starting from the connection end 111a of the first wire 111A, and an oxide superconducting wire 110 that wraps around the outer circumference starting from the connection end 111a of the second wire 111B.

[0054] The portion of the first wire 111A that makes one turn from the connection end 111a to the inner circumference side is referred to as the "kth turn portion 51" (k is an integer, for example, greater than or equal to 4 and less than or equal to n-4). The portion of the second wire 111B that makes one turn from the connection end 111a to the outer circumference side is referred to as the "k+1th turn portion 52." The oxide superconducting wire 110 that constitutes the intermediate conductive region 24 has a total of two turns.

[0055] The k+1-th winding portion 52 is overlapped on the outer peripheral surface of the k-th winding portion 51. The k-th winding portion 51 and the k+1-th winding portion 52 are adjacent to each other in the radial direction of the winding portion 130. The oxide superconducting wire 110 of the k-th winding portion 51 and the oxide superconducting wire 110 of the k+1-th winding portion 52 are in contact with each other over their entire lengths. The k-th winding portion 51 and the k+1-th winding portion 52 are electrically conductive.

[0056] 10, an insulating material 60 is interposed between the k-th turn portion 51, which is the innermost turn portion of the intermediate conductive region 24, and the k-1-th turn portion 50 adjacent to the inner circumferential side of the k-th turn portion 51, over the entire length of the turn portions 50, 51. Therefore, the k-1-th turn portion 50 and the k-th turn portion 51 are not electrically connected in the radial direction. Between the k+1th winding portion 52, which is the outermost winding portion of the intermediate conductive region 24, and the k+2th winding portion 53 adjacent to the outer circumferential side of the k+1th winding portion 52, an insulating material 60 is interposed over the entire length of the winding portions 52, 53. Therefore, the k+1th winding portion 52 and the k+2th winding portion 53 are not electrically connected in the radial direction.

[0057] [Effects of the superconducting coil according to the second embodiment] Since the superconducting coil 200 has the first end conductive region 21 and the second end conductive region 22, the superconducting coil 200 can be protected even if the superconducting properties of the oxide superconducting wire 110 at the terminal portion are deteriorated due to the above-mentioned tensile force. Since superconducting coil 200 includes end conductive regions 21 and 22, it is possible to ensure a sufficient length of oxide superconducting wire 10 in insulating region 23. This makes it possible to suppress delay in the generated magnetic field during excitation and demagnetization.

[0058] Since the superconducting coil 200 includes the intermediate conductive region 24, even if the oxide superconducting layer 3 is damaged by the above-mentioned tensile force at the intermediate joint 113 and the superconducting properties of the oxide superconducting wire 110 are reduced, the oxide superconducting wires 110 can maintain electrical continuity and bypass an overcurrent, thereby protecting the superconducting coil 200.

[0059] While the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention. For example, the superconducting coil 100 shown in FIG. 1 has a first end conduction region 21 and a second end conduction region 22, but the superconducting coil may have only one of the first end conduction region 21 and the second end conduction region 22. The number of turns of the superconducting wire constituting the end conduction region may be 2 or more.The number of turns of the superconducting wire constituting the intermediate conduction region may be 2 or more.

[0060] 8 includes an intermediate conductive region 24 including an intermediate joint 113 where wires 111 are connected to each other, but the configuration of the superconducting coil of the embodiment is not limited to this. Even when the oxide superconducting wire includes an intermediate joint, the superconducting coil of the embodiment does not need to have an intermediate conductive region. The structure of the superconducting laminate of the superconducting wire is not limited to the above-mentioned structure. The superconducting laminate does not need to have a protective layer. The superconducting laminate may include layers other than the metal substrate, the intermediate layer, the oxide superconducting layer, and the protective layer. [Explanation of symbols]

[0061] 10...oxide superconducting wire (superconducting wire), 10A, 10B...end region, 21...first end conductive region, 22...second end conductive region, 23...insulating region, 24...intermediate conductive region, 25, 35...connected portion, 30, 130...winding portion, 100, 200...superconducting coil, 111...wire body, 111a...connection end, 113...intermediate connection portion.

Claims

1. A winding portion is provided in which a superconducting wire is wound, The winding portion includes: an end conductive region that turns around two or more times starting from at least one end of the superconducting wire; an insulating region connected to the end conductive region; The end region including the end is electrically connectable to a connected portion, In the end conductive region, the superconducting wires adjacent in a radial direction of the winding portion are in contact with each other so as to be conductive therebetween, In the insulating region, an insulating material is interposed between the superconducting wires adjacent to each other in a radial direction of the winding portion. Superconducting coil.

2. the superconducting wire includes an intermediate joint at which a pair of wires having connection ends are connected to each other, The winding portion further includes intermediate conductive regions each of which winds around one or more times starting from the connection ends of the pair of wire bodies.

2. The superconducting coil according to claim 1.

3. The number of turns of the superconducting wire in the end conductive region is 5 or less.

3. The superconducting coil according to claim 1 or 2.

4. a length of the superconducting wire in the end conduction region is 1% or less of a length of the superconducting wire in the winding portion; The superconducting coil according to any one of claims 1 to 3.

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