Superconducting coil

Abstract

To provide a superconducting coil that is configured by laminating a plurality of coils, and that can reduce the influence of a stress such as an electromagnetic force.SOLUTION: A superconducting coil 100 comprises at least two coil bodies 10A, 10B, and a tape-like connection conductor 20. The coil bodies 10A, 10B are each configured by winding a tape-like superconducting wire rod 30 thereon. The connection conductor 20 electrically connects the two coil bodies 10A, 10B to each other. The two coil bodies 10A, 10B are laminated in a winding axis C direction of the coil bodies 10A, 10B. The connection conductor 20 is wound over the whole circumference of each of the two coil bodies 10A, 10B with a conductive joining layer 25 therebetween. In the superconducting coil 100, the ends of the connection conductors 20 overlap each other in at least part in a circumferential direction of the coil bodies 10A, 10B.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, superconducting coils are used that are constructed by stacking multiple pancake coils each made by winding a tape-shaped superconducting wire. Two pancake coils adjacent in the stacking direction are electrically connected via, for example, a metal plate for connection provided on the outer periphery (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-163026 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a superconducting coil, stress such as electromagnetic force generated during excitation may act, for example, in the radial expansion direction. In the above-mentioned superconducting coil, the stress in the radial expansion direction due to electromagnetic force or the like applied to the superconducting wire becomes discontinuous at the periphery of the metal plate at the boundary between the part where the metal plate is joined and the part where it is not joined, and the stress concentrates and acts on the superconducting wire at the periphery of the metal plate where the metal plate is not joined. As a result, there is a possibility that the superconducting wire may deteriorate and the characteristics of the superconducting coil may deteriorate.

[0005] An object of one embodiment of the present invention is to provide a superconducting coil configured by stacking a plurality of coils, which can reduce the influence of stress such as electromagnetic force. [Means for solving the problem]

[0006] One aspect of the present invention provides a superconducting coil comprising at least two coil bodies formed by winding tape-shaped superconducting wire, and a connecting conductor electrically connecting the two coil bodies, wherein the two coil bodies are stacked in the winding axis direction of the coil bodies, the connecting conductor is wound around the entire outer peripheral surfaces of the two coil bodies via a conductive bonding layer, and the connecting conductors overlap at least a portion of the circumference of the coil bodies.

[0007] The superconducting coil includes a connecting conductor around the entire circumference of the coil body, so that it is possible to prevent stress (such as tensile stress) caused by electromagnetic force in the radial expansion direction from acting unevenly in the circumferential direction of the coil body. This makes it possible to prevent the stress from concentrating on a part of the coil body. This reduces the effect of stress from electromagnetic force, etc., and suppresses deterioration of the characteristics of the superconducting coil.

[0008] The connecting conductor may be wound around an outer circumferential surface of the coil body two or more times.

[0009] According to this configuration, since the connecting conductor is wound around the coil body two or more times, it is possible to prevent the above-mentioned stress (tensile stress, etc.) from being biased in the circumferential direction of the coil body, and therefore it is possible to prevent the deterioration of the characteristics of the superconducting coil caused by the above-mentioned stress.

[0010] The connecting conductor may include a tape-shaped first member wound around the outer peripheral surface of the coil body with both ends facing each other, and a tape-shaped second member overlapping the outer peripheral surface of the first member, and the second member may span from a region including at least one end of the first member to a region including the other end.

[0011] According to this configuration, since the second member is provided in the non-overlapping portion of the first member, it is possible to prevent stress (tensile stress, etc.) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil body.

[0012] The second member may be wound around an outer circumferential surface of the first member one or more times.

[0013] This configuration makes it easy to equalize the mechanical properties of the connecting conductor in the circumferential direction, thereby preventing stress (such as tensile stress) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil body.

[0014] The tape-shaped third member may further overlap the outer peripheral surface of the second member, the second member being wrapped around the outer peripheral surface of the first member with both ends facing each other, and the third member may span from a region including one end of the second member to a region including the other end.

[0015] According to this configuration, since the third member is provided in the non-overlapping portion of the second member, it is possible to prevent stress (tensile stress, etc.) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil body.

[0016] It is preferable that the superconducting wire constituting the coil body has a tape-shaped coil substrate and a coil superconducting layer laminated on the coil substrate, with the coil superconducting layer facing outward, and that the connecting conductor is composed of a superconducting wire having a tape-shaped connecting conductor substrate and a connecting conductor superconducting layer laminated on the connecting conductor substrate, with the connecting conductor superconducting layer facing inward.

[0017] According to this configuration, the connection conductor and the coil body are positioned so that the superconducting layers face each other. Since the superconducting layers of the connection conductor and the coil body are close to each other, the connection characteristics between the connection conductor and the coil body are excellent.

[0018] The first member may be made of a superconducting wire, and the second member may be made of a metal tape.

[0019] According to this configuration, by selecting the metal material constituting the second member, it is possible to impart desired characteristics to the superconducting coil.

[0020] The first member may be wound around an outer circumferential surface of the coil body more than one turn, and the second member may be wound around an outer circumferential surface of the first member more than one turn.

[0021] According to this configuration, the mechanical strength of the first member and the second member can be increased, and therefore the stress (tensile stress, etc.) can be prevented from being concentrated on a part of the coil body.

[0022] The width of the connecting conductor is preferably equal to or smaller than the total width of the two coil bodies in the stacking direction.

[0023] According to this configuration, when a plurality of superconducting coils are stacked, the connection conductors are less likely to interfere with each other.

[0024] Another aspect of the present invention provides a superconducting coil comprising at least two coil bodies formed by winding tape-shaped superconducting wire, and a connecting conductor electrically connecting the two coil bodies, wherein the two coil bodies are stacked in the winding axis direction of the coil bodies, the connecting conductor is wound around the entire inner circumferential surface of the two coil bodies via a conductive bonding layer, and the connecting conductors overlap each other in at least a portion of the circumferential direction of the coil bodies.

[0025] According to this configuration, it is possible to prevent stress (tensile stress, etc.) generated by electromagnetic force, etc. from acting unevenly in the circumferential direction of the coil body. Therefore, it is possible to prevent the stress from acting concentratedly on a part of the coil body. Therefore, it is possible to reduce the influence of stress from electromagnetic force, etc., and to suppress deterioration of the characteristics of the superconducting coil. Effect of the Invention

[0026] According to one aspect of the present invention, there is provided a superconducting coil configured by stacking a plurality of coils, which is capable of reducing the influence of stress such as electromagnetic force. [Brief description of the drawings]

[0027] [Figure 1] FIG. 2 is a front view of the superconducting coil of the first embodiment. [Diagram 2] FIG. 2 is a side view of the superconducting coil of the first embodiment. [Diagram 3] 1 is a schematic diagram of a coil body constituting a superconducting coil of a first embodiment. [Figure 4] 1 is a cross-sectional view of a portion of a superconducting coil according to a first embodiment. [Diagram 5] 1 is a cross-sectional view of an oxide superconducting wire constituting a superconducting coil of a first embodiment. [Figure 6] FIG. 11 is a front view of a superconducting coil according to a second embodiment. [Figure 7] FIG. 11 is a side view of a superconducting coil according to a second embodiment. [Figure 8] FIG. 11 is a front view of a superconducting coil according to a third embodiment. [Figure 9] FIG. 11 is a side view of a superconducting coil according to a third embodiment. [Figure 10] FIG. 13 is a front view of a superconducting coil according to a fourth embodiment. [Figure 11] FIG. 11 is a cross-sectional view of a portion of a superconducting coil according to a fourth embodiment. [Figure 12] FIG. 13 is a front view of a superconducting coil according to a fifth embodiment. [Figure 13] FIG. 13 is a side view of a superconducting coil according to a fifth embodiment. [Figure 14] FIG. 13 is a front view of a superconducting coil according to a sixth embodiment. [Figure 15] FIG. 13 is a side view of a superconducting coil according to a sixth embodiment. [Figure 16] FIG. 13 is a front view of a superconducting coil according to a seventh embodiment. [Figure 17] FIG. 13 is a side view of a superconducting coil according to a seventh embodiment. [Figure 18] FIG. 13 is a front view of a superconducting coil according to an eighth embodiment. [Figure 19] FIG. 13 is a side view of a superconducting coil according to an eighth embodiment. [Figure 20] FIG. 13 is a cross-sectional view of a portion of a superconducting coil according to an eighth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

[0029] [Superconducting coil] (First embodiment) FIG. 1 is a front view of a superconducting coil 100 of the first embodiment. FIG. 2 is a side view of the superconducting coil 100. FIG. 3 is a schematic diagram of a coil body 10 constituting the superconducting coil 100. FIG. 4 is a cross-sectional view of a portion of the superconducting coil 100. FIG. 4 is a cross-sectional view taken along line II shown in FIG. 1. FIG. 5 is a cross-sectional view of an oxide superconducting wire 30 constituting the superconducting coil 100. FIG. 5 is a cross-sectional view of the oxide superconducting wire 30 perpendicular to the longitudinal direction.

[0030] 1 and 2, the superconducting coil 100 includes a plurality of (two in this embodiment) coil bodies 10 and a connecting conductor 20. The two coil bodies 10 are referred to as a first coil body 10A and a second coil body 10B, respectively.

[0031] As shown in FIG. 3, the coil body 10 is composed of an oxide superconducting wire 30 (superconducting wire). The coil body 10 is a multi-layer wound coil in which the oxide superconducting wire 30 is stacked in the thickness direction and wound multiple times. "C" shown in FIGS. 2 and 3 is the winding axis of the coil body 10. The coil body 10 is, for example, a circular pancake coil. Hereinafter, the positional relationship of each component may be described with the top in FIG. 2 as the top and the bottom as the bottom. The direction around the winding axis C is the circumferential direction of the coil body 10.

[0032] 4, the first coil body 10A may be configured by co-wounding an oxide superconducting wire 30 and an insulating tape 40. The first coil body 10A may be impregnated with a resin such as an epoxy resin.

[0033] As shown in FIG. 5, an oxide superconducting wire 30 includes a superconducting laminate 5 and a stabilization layer 6. The superconducting laminate 5 and the stabilization layer 6 are made of a material selected from the group consisting of tungsten carbide and tantalum oxide. The superconducting laminate 5 includes a 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 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 substrate 1.

[0034] Regarding the coil body 10 (10A, 10B), the substrate 1 is an example of a "coil substrate". The intermediate layer 2 is an example of a "coil intermediate layer". The oxide superconducting layer 3 is an example of a "coil oxide superconducting layer". The protective layer 4 is an example of a "coil protective layer".

[0035] The oxide superconducting wire 30 is formed in a tape shape. The Y direction is the thickness direction of the oxide superconducting wire 30, and is the direction in which each layer, such as the substrate 1, intermediate layer 2, oxide superconducting layer 3, and protective layer 4, is laminated. The X direction is the width direction of the oxide superconducting wire 30, and is the direction perpendicular to the longitudinal direction and thickness direction of the oxide superconducting wire 30.

[0036] The substrate 1 is made of, for example, a metal. Specific examples of metals constituting the substrate 1 include nickel alloys such as Hastelloy (registered trademark); stainless steel; and oriented Ni-W alloys in which texture is introduced into nickel alloys. The thickness of the 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 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.

[0037] The intermediate layer 2 is provided between the substrate 1 and the oxide superconducting layer 3. The intermediate layer 2 is formed on the first main surface 1a of the 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 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. The intermediate layer 2 is not an essential component of the oxide superconducting wire 30, and the intermediate layer 2 may not be formed when the substrate 1 itself has orientation.

[0038] The diffusion prevention layer has a function of preventing some of the components of the 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.

[0039] A bed layer may be formed on the diffusion prevention layer in order to reduce the reaction at the interface between the 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.

[0040] 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).

[0041] 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.

[0042] 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 substrate 1 side).

[0043] 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.

[0044] 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 facing the oxide superconducting layer 3. Reference numeral 5b denotes a side surface of the superconducting laminate 5 (the side surface of the 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 substrate 1), which is the surface opposite to the first main surface 5a.

[0045] 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 thickness of the stabilization layer 6 is, for example, about 10 to 300 μm. The stabilization layer 6 functions as a bypass section for diverting an overcurrent that occurs 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, and silver. The stabilization layer 6 can be formed by plating (e.g., electrolytic plating).

[0046] As shown in FIG. 4, oxide superconducting wire 30 is wound with substrate 1 facing the inner periphery and oxide superconducting layer 3 facing the outer periphery.

[0047] The second coil body 10B has a similar configuration to the first coil body 10A. The second coil body 10B is, for example, a circular pancake coil (see FIG. 3). The outer diameter of the first coil body 10A and the outer diameter of the second coil body 10B are the same. As shown in Fig. 2, the second coil body 10B has a common winding axis C with the first coil body 10A. The first coil body 10A and the second coil body 10B are stacked in the direction of the winding axis C. The first coil body 10A and the second coil body 10B are adjacent to each other in the direction of the winding axis C. As shown in Fig. 4, an insulating spacer 41 (insulating sheet) is provided between the first coil body 10A and the second coil body 10B.

[0048] 2 and 4, the connecting conductor 20 is tape-shaped. As shown in Fig. 1, one end in the length direction of the connecting conductor 20 is called a first end 20a. The other end in the length direction of the connecting conductor 20 is called a second end 20b.

[0049] As shown in FIGS. 2 and 4, the connecting conductor 20 is made of, for example, a REBCO-based oxide superconductor, a BSCCO-based oxide superconductor, a metal (copper, a copper alloy, a silver alloy, etc.), or the like. In the superconducting coil 100, the connecting conductor 20 is made of an oxide superconducting wire 50 (superconducting wire) similar to the oxide superconducting wire 30 (see FIG. 5).

[0050] 4, an oxide superconducting wire 50 includes a superconducting laminate 5 and a stabilization layer 6. The superconducting laminate 5 includes a substrate 1, an intermediate layer 2, an oxide superconducting layer 3, and a protective layer 4. In the connecting conductor 20, the substrate 1 is an example of a "connecting conductor substrate". The intermediate layer 2 is an example of a "connecting conductor intermediate layer". The oxide superconducting layer 3 is an example of a "connecting conductor oxide superconducting layer". The protective layer 4 is an example of a "connecting conductor protective layer".

[0051] 2 and 4, the connecting conductor 20 is wound around the outer peripheral surfaces 11A, 11B of the first coil body 10A and the second coil body 10B in the circumferential direction of the coil bodies 10A, 10B. As shown in Fig. 4, the connecting conductor 20 is wound around the coil bodies 10A, 10B with the substrate 1 facing the outer periphery and the oxide superconducting layer 3 facing the inner periphery. The connecting conductor 20 and the coil bodies 10A, 10B are oriented such that the oxide superconducting layer 3 sides face each other. Since the connecting conductor 20 and the oxide superconducting layers 3 of the coil bodies 10A, 10B are close to each other, the connection characteristics between the connecting conductor 20 and the coil bodies 10A, 10B are excellent.

[0052] As shown in FIG. 4, an area including a first side edge 21a (one end in the width direction) of an inner circumferential surface 21 of the connecting conductor 20 (a winding portion 22 described later) is in contact with an outer circumferential surface 11A of the first coil body 10A via a bonding layer 25. An area including a second side edge 21b (the other end in the width direction) of the inner circumferential surface 21 of the connecting conductor 20 is in contact with an outer circumferential surface 11B of the second coil body 10B via a bonding layer 25. The connecting conductor 20 spans from the outer circumferential surface 11A of the first coil body 10A to the outer circumferential surface 11B of the second coil body 10B. The connecting conductor 20 electrically connects the first coil body 10A and the second coil body 10B.

[0053] The connecting conductor 20 is preferably provided in the center of a width W3 in the stacking direction of the two coil bodies 10 (i.e., the total width of the first coil body 10A, the second coil body 10B, and the spacer 41). This makes the joint area between the first coil body 10A and the connecting conductor 20 the same as the joint area between the second coil body 10B and the connecting conductor 20, thereby making it possible to reduce the electrical resistance between the first coil body 10A and the second coil body 10B.

[0054] The width W1 of the connecting conductor 20 is preferably equal to or less than the total width W3 of the two coil bodies 10. If the width W1 of the connecting conductor 20 is greater than the width W3 of the two coil bodies 10, the connecting conductors 20 may interfere with each other when stacking a plurality of superconducting coils 100. If the width W1 is equal to or less than the width W3, such interference is unlikely to occur. It is also preferable that the width W1 of the connecting conductor 20 and the width W3 of the two coil bodies 10 are substantially the same. This makes it possible to suppress deformation of the oxide superconducting wires 30 of the coil bodies 10A, 10B, such that the oxide superconducting wires 30 fall outward, when a stress such as an electromagnetic force acts in the radial expansion direction of the coil bodies 10A, 10B.

[0055] The "bonding layer" is a conductive layer formed of a conductive material such as metal. The bonding layer is made of, for example, solder, brazing material, etc. The bonding layer 25 bonds the connection conductor 20 and the coil bodies 10A and 10B. The bonding layer 26 bonds the first length region 20A and the second length region 20B. In FIG. 4, the bonding layer 25 has the same width as the connecting conductor 20, but the bonding layer may be in a form in which it wets and spreads in the width direction beyond the width of the connecting conductor on the outer circumferential surface of the coil body.

[0056] 1, the connecting conductor 20 is wound around the first coil body 10A and the second coil body 10B. The connecting conductor 20 has a length that exceeds one turn around the outer circumferential surfaces 11A, 11B of the first coil body 10A and the second coil body 10B. Therefore, the connecting conductor 20 turns around the coil bodies 10A, 10B in the circumferential direction once, and an excess portion (hereinafter referred to as a second length region 20B) is overlapped on a portion of the length of this one turn (hereinafter referred to as a turn portion 22).

[0057] The winding portion 22 of the connecting conductor 20 is provided around the entire circumference of the outer circumferential surfaces 11A, 11B. The winding portion 22 is in contact with the outer circumferential surfaces 11A, 11B of the coil bodies 10A, 10B via a bonding layer 25. The second length region 20B (excess length portion) of the connecting conductor 20 is overlapped on the outer circumferential surface of the first length region 20A of the winding portion 22 via a bonding layer 26. The first length region 20A is a length region including the first end 20a. The second length region 20B is a length region including the second end 20b. In this way, the connecting conductor 20 overlaps with the coil bodies 10A, 10B in a part (the first length region 20A and the second length region 20B) in the circumferential direction. The length of the overlapping portion is, for example, 10 mm or more.

[0058] In the superconducting coil 100, stress such as electromagnetic force generated during excitation may act in the radial direction of the coil bodies 10A, 10B. Since the superconducting coil 100 includes the connecting conductors 20 around the entire circumference of the coil bodies 10A, 10B, it is possible to prevent the stress (tensile stress, etc.) generated by the electromagnetic force from acting unevenly in the circumferential direction of the coil bodies 10A, 10B. This makes it possible to prevent the stress (tensile stress, etc.) from concentrating on and acting on a part of the coil bodies 10A, 10B. This reduces the effect of the stress such as electromagnetic force, and suppresses deterioration of the characteristics of the superconducting coil 100.

[0059] The connecting conductor 20 has a length that exceeds one turn around the outer circumferential surfaces 11A, 11B, and some length regions 20A, 20B overlap, so that even if the outer diameter of the coil bodies 10A, 10B increases due to stress such as electromagnetic force, the winding of the connecting conductor 20 can be ensured over the entire circumference. This makes it possible to prevent the stress (such as tensile stress) from concentrating on a portion of the coil bodies 10A, 10B.

[0060] Since the connecting conductor 20 is made up of one oxide superconducting wire 50, it can be easily installed by simply winding the oxide superconducting wire 50 around the coil bodies 10A, 10B.

[0061] [Superconducting coil] (Second embodiment) Fig. 6 is a front view of a superconducting coil 200 of the second embodiment. Fig. 7 is a side view of the superconducting coil 200. Note that the same components as those in the other embodiments are given the same reference numerals and the description thereof will be omitted.

[0062] As shown in Fig. 6 and Fig. 7, superconducting coil 200 includes a plurality of coil bodies 10 and a connecting conductor 120. Connecting conductor 120 is made of oxide superconducting wire 50. Connecting conductor 120 is formed to be longer than connecting conductor 20 (see Fig. 1 and Fig. 2). Other configurations of superconducting coil 200 are the same as those of superconducting coil 100 shown in Fig. 1 and Fig. 2.

[0063] The connecting conductor 120 is wound around the coil bodies 10A and 10B. The connecting conductor 120 is in contact with the outer peripheral surfaces 11A and 11B of the coil bodies 10A and 10B via a bonding layer 125. The connecting conductor 120 electrically connects the first coil body 10A and the second coil body 10B.

[0064] The connecting conductor 120 has a length that exceeds two turns around the outer circumferential surfaces 11A, 11B of the coil bodies 10A, 10B. Therefore, the connecting conductor 120 turns around the coil bodies 10A, 10B twice in the circumferential direction, and the excess length is overlapped with the turning portion 122 of this two-layer structure. Of the winding portion 122 of the connecting conductor 120, a first layer 122A including the first end 120a is provided over the entire circumference of the outer circumferential surfaces 11A, 11B. The first layer 122A is in contact with the outer circumferential surfaces 11A, 11B of the coil bodies 10A, 10B via a bonding layer 125. Of the winding portion 122, a second layer 122B is layered on the outer circumferential surface of the first layer 122A via a bonding layer 126. A second length region 120B (excess length portion) including the second end 120b is layered on the outer circumferential surface of the second layer 122B via a bonding layer 127.

[0065] Since the superconducting coil 200 includes the connecting conductor 120 around the entire circumference of the coil bodies 10A and 10B, it is possible to prevent stress (such as tensile stress) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil bodies 10A and 10B. Therefore, it is possible to suppress deterioration of the characteristics of the superconducting coil 200 caused by the stress.

[0066] Since some length regions of the connecting conductor 120, i.e., the second layer 122B and the second length region 120B, overlap the first layer 122A, winding around the entire circumference of the connecting conductor 120 can be ensured even if the outer diameter of the coil bodies 10A, 10B becomes larger due to stress such as electromagnetic force.

[0067] In the superconducting coil 200, the connecting conductor 120 is composed of one oxide superconducting wire 50, and therefore the superconducting coil 200 can be easily installed by simply winding the oxide superconducting wire 50 around the coil bodies 10A, 10B.

[0068] Since the connecting conductor 120 is wound around the coil bodies 10A, 10B two or more times, it is possible to prevent the above-mentioned stress (tensile stress, etc.) from being biased in the circumferential direction of the coil bodies 10A, 10B, and therefore it is possible to prevent the deterioration of the characteristics of the superconducting coil 200 caused by the above-mentioned stress.

[0069] [Superconducting coil] (Third embodiment) Fig. 8 is a front view of a superconducting coil 300 of the third embodiment. Fig. 9 is a side view of the superconducting coil 300. Note that the same components as those in the other embodiments are given the same reference numerals and the description thereof will be omitted.

[0070] 8 and 9, the superconducting coil 300 includes a plurality of coil bodies 10 and a connecting conductor 220. The connecting conductor 220 includes a first connecting conductor 220A (first member) and a second connecting conductor 220B (second member). The first connecting conductor 220A and the second connecting conductor 220B are formed of an oxide superconducting wire 50.

[0071] The first connecting conductor 220A is wound around the coil bodies 10A and 10B. The first connecting conductor 220A is in contact with the outer circumferential surfaces 11A and 11B of the coil bodies 10A and 10B via a bonding layer 225. The first connecting conductor 220A electrically connects the first coil body 10A and the second coil body 10B.

[0072] The first connecting conductor 220A has a length that makes one turn around the outer circumferential surfaces 11A, 11B of the coil bodies 10A, 10B. Therefore, the first connecting conductor 220A makes one turn around the coil bodies 10A, 10B in the circumferential direction. The first connecting conductor 220A is in contact with the outer circumferential surfaces 11A, 11B over the entire circumference via a bonding layer 225. The first end 220Aa and the second end 220Ab of the first connecting conductor 220A face each other. That is, both ends of the first connecting conductor 220A face each other. The first end 220Aa and the second end 220Ab may be butted against each other.

[0073] The connecting conductor can be considered to have wound around the outer periphery of the coil body if it is wound around 95% or more of the circumference of the outer periphery of the coil body. In this case, the connecting conductor can be considered to have been wound around the entire circumference of the coil body.

[0074] The second connecting conductor 220B is layered on the outer peripheral surface of the first connecting conductor 220A via a bonding layer 226. The second connecting conductor 220B spans the circumferential direction from the first length region 220A1 to the second length region 220A2 of the first connecting conductor 220A. The first length region 220A1 is a length region of the first connecting conductor 220A that includes the first end 220Aa. The second length region 220A2 is a length region of the first connecting conductor 220A that includes the second end 220Ab.

[0075] Since the superconducting coil 300 includes the connecting conductor 220 around the entire circumference of the coil bodies 10A, 10B, it is possible to prevent stress (such as tensile stress) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil bodies 10A, 10B. Therefore, it is possible to suppress the deterioration of the characteristics of the superconducting coil 300 caused by the stress.

[0076] Since the second connecting conductor 220B overlaps the first connecting conductor 220A, the connecting conductor 220 can be wound around the entire circumference even if the outer diameter of the coil bodies 10A, 10B increases due to stress such as electromagnetic force.

[0077] The connecting conductor 220 has a first connecting conductor 220A wound with both ends facing each other. Since the superconducting coil 300 is provided with a second connecting conductor 220B in a non-overlapping portion of the first connecting conductor 220A, it is possible to prevent stress (such as tensile stress) due to an electromagnetic force or the like from acting unevenly in the circumferential direction of the coil bodies 10A, 10B.

[0078] [Superconducting coil] (fourth embodiment) Fig. 10 is a front view of a superconducting coil 400 of the fourth embodiment. Fig. 11 is a cross-sectional view of a part of the superconducting coil 400. Fig. 11 is a cross-sectional view taken along II-II shown in Fig. 10. Note that the same components as those in the other embodiments are given the same reference numerals and the description thereof will be omitted.

[0079] 10 and 11, superconducting coil 400 includes a plurality of coil bodies 10 and a connecting conductor 320. Connecting conductor 320 includes a first connecting conductor 220A (see FIGS. 8 and 9), a second connecting conductor 320B (second member), and a third connecting conductor 320C (third member).

[0080] The first connecting conductor 220A is made of an oxide superconducting wire 50. The second connecting conductor 320B and the third connecting conductor 320C are made of a metal tape. Examples of metals that make up the metal tape include nickel alloys (such as Hastelloy (registered trademark)), copper, copper alloys, and silver alloys.

[0081] The second connecting conductor 320B is layered on the outer peripheral surface of the first connecting conductor 220A with a bonding layer 326 interposed therebetween. The second connecting conductor 320B has a length that makes one revolution around the outer circumferential surface of the first connecting conductor 220A. Therefore, the second connecting conductor 320B makes one revolution around the first connecting conductor 220A in the circumferential direction. The first end 320Ba and the second end 320Bb of the second connecting conductor 320B face each other. That is, both ends of the second connecting conductor 320B face each other. The first end 320Ba and the second end 320Bb may be butted together.

[0082] The circumferential positions of the ends 220Aa, 220Ab of the first connecting conductor 220A are different from the circumferential positions of the ends 320Ba, 320Bb of the second connecting conductor 320B. The ends 220Aa, 220Ab of the first connecting conductor 220A and the ends 320Ba, 320Bb of the second connecting conductor 320B are positioned, for example, 180° apart in the circumferential direction.

[0083] The third connecting conductor 320C is overlapped on the outer peripheral surface of the second connecting conductor 320B with a bonding layer 327 interposed therebetween. The third connecting conductor 320C spans the circumferential direction from the first length region 320B1 to the second length region 320B2 of the second connecting conductor 320B. The first length region 320B1 is a length region of the second connecting conductor 320B that includes the first end 320Ba. The second length region 320B2 is a length region of the second connecting conductor 320B that includes the second end 320Bb.

[0084] As shown in Fig. 11, the width W2 of the second connecting conductor 320B is larger than the width W1 of the first connecting conductor 220A. The width W2 of the second connecting conductor 320B is preferably equal to or smaller than the total width W3 of the coil bodies 10A, 10B and the insulating spacer 41 (i.e., equal to or smaller than the width W3). The first side edge 320Bc (one end in the width direction) of the second connecting conductor 320B is at the same height as the upper surface of the first coil body 10A or is located lower than the upper surface. The second side edge 320Bd (the other end in the width direction) of the second connecting conductor 320B is at the same height as the lower surface of the second coil body 10B or is located higher than the lower surface. 11, the width W2 of the second connecting conductor 320B is smaller than the combined width W3 of the coil bodies 10A and 10B. The first side edge 320Bc of the second connecting conductor 320B is located lower than the upper surface of the first coil body 10A. The second side edge 320Bd of the second connecting conductor 320B is located higher than the lower surface of the second coil body 10B.

[0085] The width W2 of the second connecting conductor 320B is preferably approximately the same as the total width W3 of the coil bodies 10A, 10B and the insulating spacer 41. As a result, even if the width W1 of the first connecting conductor 220A is smaller than the width W3, when stress such as electromagnetic force generated during excitation acts in the radial expansion direction of the coil bodies 10A, 10B, the outer circumferential surfaces of the coil bodies 10A, 10B can be supported over a wide range in the width direction. Therefore, deformation such as outward collapse of the oxide superconducting wire 30 can be suppressed.

[0086] When the width W2 of the second connecting conductor 320B is equal to or smaller than the combined width W3 of the coil bodies 10A, 10B, the second connecting conductor 320B can be easily prevented from contacting other second connecting conductors 320B (not shown) adjacent to each other in the winding axis C direction. The width of the third connecting conductor 320C (see FIG. 10) may be the same as the width of the second connecting conductor 320B.

[0087] Since the superconducting coil 400 includes the connecting conductor 320 around the entire circumference of the coil bodies 10A and 10B, it is possible to prevent stress (such as tensile stress) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil bodies 10A and 10B. Therefore, it is possible to suppress deterioration of the characteristics of the superconducting coil 400 caused by the stress.

[0088] In the connecting conductor 320, the second connecting conductor 320B overlaps the first connecting conductor 220A. Furthermore, the third connecting conductor 320C overlaps the second connecting conductor 320B. Therefore, even if the outer diameter of the coil bodies 10A, 10B increases due to stress such as electromagnetic force, winding over the entire circumference of the connecting conductor 320 can be ensured.

[0089] In the superconducting coil 400, the second connecting conductor 320B is wound around the first connecting conductor 220A for one turn, which makes it easy to equalize the mechanical properties of the connecting conductor 320 in the circumferential direction. This makes it possible to prevent stress (such as tensile stress) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil bodies 10A, 10B.

[0090] Since the superconducting coil 400 has the third connecting conductor 320C provided in the non-overlapping portion of the second connecting conductor 320B, stress (such as tensile stress) due to electromagnetic force or the like can be prevented from acting unevenly in the circumferential direction of the coil bodies 10A, 10B.

[0091] Since superconducting coil 400 includes second connecting conductor 320B and third connecting conductor 320C made of metal tape, desired characteristics can be imparted to superconducting coil 400 by selecting the metal material making up connecting conductors 320B, 320C. For example, if the metal constituting the connecting conductors 320B and 320C is a nickel alloy (such as Hastelloy (registered trademark)), the mechanical strength of the connecting conductors 320B and 320C will be high, which is advantageous in reducing the influence of the stress. If the metal constituting the connecting conductor 320B is a metal with good conductivity (such as copper, a copper alloy, or a silver alloy), the function of the connecting conductor 320B as a bypass part can be improved.

[0092] [Superconducting coil] (Fifth embodiment) Fig. 12 is a front view of a superconducting coil 500 of the fifth embodiment. Fig. 13 is a side view of the superconducting coil 500. Note that the same components as those in the other embodiments are given the same reference numerals and the description thereof will be omitted.

[0093] 12 and 13, the superconducting coil 500 includes a plurality of coil bodies 10 and a connecting conductor 420. The connecting conductor 420 includes a first connecting conductor 220A (see FIGS. 8 and 9) and a second connecting conductor 420B (second member). The first connecting conductor 220A and the second connecting conductor 420B are formed of an oxide superconducting wire 50.

[0094] The second connecting conductor 420B is layered on the outer peripheral surface of the first connecting conductor 220A with a bonding layer 426 interposed therebetween. The second connecting conductor 420B has a length that makes one revolution around the outer circumferential surface of the first connecting conductor 220A. Therefore, the second connecting conductor 420B makes one revolution around the first connecting conductor 220A in the circumferential direction. The first end 420Ba and the second end 420Bb of the second connecting conductor 420B face each other. That is, both ends of the second connecting conductor 420B face each other. The first end 420Ba and the second end 420Bb may be butted together. The second connecting conductor may be wound around the outer circumferential surface of the first connecting conductor more than once, in which case the second connecting conductors overlap each other over a portion of their length.

[0095] The circumferential positions of the ends 220Aa, 220Ab of the first connecting conductor 220A are different from the circumferential positions of the ends 420Ba, 420Bb of the second connecting conductor 420B. The ends 220Aa, 220Ab of the first connecting conductor 220A and the ends 420Ba, 420Bb of the second connecting conductor 420B are positioned, for example, 180° apart in the circumferential direction.

[0096] Since the superconducting coil 500 includes the connecting conductor 420 that covers the entire circumference of the coil bodies 10A and 10B, it is possible to prevent stress (such as tensile stress) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil bodies 10A and 10B. Therefore, it is possible to suppress deterioration of the characteristics of the superconducting coil 500 caused by the stress.

[0097] Since the second connecting conductor 420B overlaps the first connecting conductor 220A, the connecting conductor 420 can be wound around the entire circumference even if the outer diameter of the coil bodies 10A, 10B increases due to stress such as electromagnetic force.

[0098] The connecting conductor 420 is configured such that the first connecting conductor 220A makes one turn around the coil bodies 10A and 10B, and the second connecting conductor 420B makes one turn around the first connecting conductor 220A, so that the deviation of the mechanical properties in the circumferential direction can be reduced, and thus the deterioration of the properties of the superconducting coil 500 caused by the stress can be suppressed.

[0099] [Superconducting coil] (Sixth embodiment) Fig. 14 is a front view of a superconducting coil 600 of the sixth embodiment. Fig. 15 is a side view of the superconducting coil 600. Note that the same components as those in the other embodiments are given the same reference numerals and the description thereof will be omitted.

[0100] 14 and 15, the superconducting coil 600 includes a plurality of coil bodies 10 and a connecting conductor 520. The connecting conductor 520 includes a first connecting conductor 220A (see FIGS. 8 and 9) and a second connecting conductor 520B (second member). The second connecting conductor 520B is made of a metal tape. Examples of metals that make up the metal tape include copper, copper alloys, silver alloys, and nickel alloys (Hastelloy (registered trademark), etc.).

[0101] The second connecting conductor 520B is layered on the outer peripheral surface of the first connecting conductor 220A with a bonding layer 526 interposed therebetween. The second connecting conductor 520B has a length that makes one revolution around the outer circumferential surface of the first connecting conductor 220A. Therefore, the second connecting conductor 520B makes one revolution around the first connecting conductor 220A in the circumferential direction. The first end 520Ba and the second end 520Bb of the second connecting conductor 520B face each other. That is, both ends of the second connecting conductor 520B face each other. The first end 520Ba and the second end 520Bb may be butted together.

[0102] The circumferential positions of the ends 220Aa, 220Ab of the first connecting conductor 220A are different from the circumferential positions of the ends 520Ba, 520Bb of the second connecting conductor 520B. The ends 220Aa, 220Ab of the first connecting conductor 220A and the ends 520Ba, 520Bb of the second connecting conductor 520B are positioned, for example, 180° apart in the circumferential direction.

[0103] Since the superconducting coil 600 includes the connecting conductor 520 around the entire circumference of the coil bodies 10A and 10B, it is possible to prevent stress (such as tensile stress) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil bodies 10A and 10B. Therefore, it is possible to suppress deterioration of the characteristics of the superconducting coil 600 caused by the stress.

[0104] Since the second connecting conductor 520B overlaps the first connecting conductor 220A, the connecting conductor 520 can be wound around the entire circumference even if the outer diameter of the coil bodies 10A, 10B increases due to stress such as electromagnetic force.

[0105] The connecting conductor 520 is configured such that the first connecting conductor 220A makes one turn around the coil bodies 10A, 10B, and the second connecting conductor 520B makes one turn around the first connecting conductor 220A, so that the deviation of the mechanical properties in the circumferential direction can be reduced, and thus the deterioration of the properties of the superconducting coil 600 caused by the stress can be suppressed.

[0106] Since the superconducting coil 600 includes the second connecting conductor 520B made of a metal tape, the selection of the metal material constituting the second connecting conductor 520B can impart desired characteristics to the superconducting coil 600. For example, if the metal constituting the second connecting conductor 520B is a metal with good electrical conductivity (e.g., copper, a copper alloy, a silver alloy, etc.), the function of the second connecting conductor 520B as a bypass section can be improved.

[0107] [Superconducting coil] (Seventh embodiment) Fig. 16 is a front view of a superconducting coil 700 of the seventh embodiment. Fig. 17 is a side view of the superconducting coil 700. Note that the same components as those in the other embodiments are given the same reference numerals and the description thereof will be omitted.

[0108] 16 and 17, the superconducting coil 700 includes a plurality of coil bodies 10 and a connecting conductor 620. The connecting conductor 620 includes a first connecting conductor 20 (see FIGS. 1 and 2) and a second connecting conductor 620B (second member). The second connecting conductor 620B is made of a metal tape. Examples of metals that make up the metal tape include copper, copper alloys, silver alloys, and nickel alloys (Hastelloy (registered trademark), etc.).

[0109] The second connecting conductor 620B is layered on the outer peripheral surface of the first connecting conductor 20 with a bonding layer 626 interposed therebetween. The second connecting conductor 620B has a length that exceeds one turn of the first connecting conductor 20. Therefore, the second connecting conductor 620B turns once around the first connecting conductor 20 in the circumferential direction, and an excess length portion (second length region 620D) is overlapped with this turning portion 622. The second length region 620D (excess length portion) of the second connecting conductor 620B is overlapped on the outer peripheral surface of the first length region 620C of the turning portion 622 via a bonding layer 627.

[0110] Since the superconducting coil 700 includes the connecting conductor 620 around the entire circumference of the coil bodies 10A and 10B, it is possible to prevent stress (such as tensile stress) due to electromagnetic force or the like from acting unevenly in the circumferential direction of the coil bodies 10A and 10B. Therefore, it is possible to prevent the deterioration of the characteristics of the superconducting coil 700 caused by the stress.

[0111] The connecting conductor 620 includes the first connecting conductor 20 and the second connecting conductor 620B having a length exceeding one turn, and therefore it is possible to increase the mechanical strength of the first connecting conductor 20 and the second connecting conductor 620B. This makes it possible to prevent the stress (such as tensile stress) from concentrating on a portion of the coil bodies 10A, 10B.

[0112] Since the superconducting coil 700 includes the second connecting conductor 620B made of a metal tape, the selection of the metal material constituting the second connecting conductor 620B can impart desired characteristics to the superconducting coil 700. For example, if the metal constituting the second connecting conductor 620B is a metal with good electrical conductivity (e.g., copper, a copper alloy, a silver alloy, etc.), the function of the second connecting conductor 620B as a bypass section can be improved.

[0113] [Superconducting coil] (Eighth embodiment) Fig. 18 is a front view of a superconducting coil 800 of the eighth embodiment. Fig. 19 is a side view of the superconducting coil 800. Fig. 20 is a cross-sectional view of a part of the superconducting coil 800. Fig. 20 is a cross-sectional view taken along line III-III shown in Fig. 18. Note that the same components as those in the other embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

[0114] 18 and 19, superconducting coil 800 includes a plurality of coil bodies 10 and a connecting conductor 720. Connecting conductor 720 is tape-shaped. As shown in Fig. 18, one end in the length direction of connecting conductor 720 is referred to as first end 720a. The other end in the length direction of connecting conductor 720 is referred to as second end 720b.

[0115] The connecting conductor 720 is made of, for example, a REBCO-based oxide superconductor, a BSCCO-based oxide superconductor, a metal (copper, a copper alloy, a silver alloy, etc.), or the like. In superconducting coil 800, connecting conductor 720 is made of oxide superconducting wire 50 similar to oxide superconducting wire 30 (see FIG. 5).

[0116] 20, the connecting conductor 720 is provided on the inner circumferential surfaces 12A, 12B of the first coil body 10A and the second coil body 10B along the circumferential direction of the coil bodies 10A, 10B. The connecting conductor 720 is oriented such that the substrate 1 faces the inner circumferential side and the oxide superconducting layer 3 faces the outer circumferential side. The connecting conductor 720 and the coil bodies 10A, 10B are oriented such that the oxide superconducting layer 3 sides face each other.

[0117] An area of ​​the inner circumferential surface 721 of the connecting conductor 720 including a first side edge 721a (one end in the width direction) is in contact with the inner circumferential surface 12A of the first coil body 10A via a bonding layer 725. An area of ​​the inner circumferential surface 721 of the connecting conductor 720 including a second side edge 721b (the other end in the width direction) is in contact with the inner circumferential surface 12B of the second coil body 10B via a bonding layer 725. The connecting conductor 720 spans from the inner circumferential surface 12A of the first coil body 10A to the inner circumferential surface 12B of the second coil body 10B. The connecting conductor 720 electrically connects the first coil body 10A and the second coil body 10B.

[0118] 18, the connecting conductor 720 has a length that exceeds one turn around the inner circumferential surfaces 12A, 12B of the first coil body 10A and the second coil body 10B. Therefore, the connecting conductor 720 turns around the coil bodies 10A, 10B once in the circumferential direction, and the excess length is overlapped with the turn portion 722.

[0119] The winding portion 722 of the connecting conductor 720 is provided around the entire circumference of the inner circumferential surfaces 12A, 12B. The winding portion 722 is in contact with the inner circumferential surfaces 12A, 12B of the coil bodies 10A, 10B via a bonding layer 725. The second length region 720B (excess length portion) of the connecting conductor 720 is overlapped on the inner circumferential surface of the first length region 720A of the winding portion 722 via a bonding layer 726. The first length region 720A is a length region that includes the first end 720a. The second length region 720B is a length region that includes the second end 720b.

[0120] Since superconducting coil 800 includes connecting conductors 720 around the entire circumference of coil bodies 10A, 10B, it is possible to prevent stress (tensile stress, etc.) due to electromagnetic force, etc. from acting unevenly in the circumferential direction of coil bodies 10A, 10B. This makes it possible to prevent the stress (tensile stress, etc.) from concentrating on a portion of coil bodies 10A, 10B. This reduces the effect of stress due to electromagnetic force, etc., and suppresses deterioration of the characteristics of superconducting coil 800.

[0121] The connecting conductor 720 has a length that exceeds one revolution around the inner surfaces 12A, 12B, and some length regions 720A, 720B overlap, so that winding around the entire circumference of the connecting conductor 720 can be ensured even if the inner diameter of the coil bodies 10A, 10B becomes larger due to stress such as electromagnetic force.

[0122] In superconducting coil 800, connecting conductor 720 is made of one oxide superconducting wire 50, and therefore can be easily installed.

[0123] 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. Although the superconducting coil 100 shown in Fig. 2 and Fig. 4 is configured by stacking two coil bodies 10, the superconducting coil may be configured by stacking any number of coil bodies, three or more. For example, a configuration in which four coil bodies are stacked, a configuration in which six coil bodies are stacked, and a configuration in which eight coil bodies are stacked can be exemplified. In this case, the connection conductor contacts the outer peripheral surfaces of at least two adjacent coil bodies over the entire circumference. The connection conductor is wound around the coil body so that the connection conductor overlaps with each other at least partially in the circumferential direction of the coil body. In this way, the connection conductor electrically connects the two adjacent coil bodies.

[0124] The superconducting coil of the embodiment may have a configuration in which a connecting conductor is provided on the outer circumferential surface of the coil body (see FIG. 1, etc.) and also a connecting conductor is provided on the inner circumferential surface of the coil body (see FIG. 18, etc.). For example, the following configuration can be exemplified. The superconducting coil exemplified here is configured by stacking four coil bodies (first to fourth coil bodies) in this order in the winding axis direction. A first connecting conductor is provided on the outer circumferential surfaces of the first and second coil bodies. A second connecting conductor is provided on the inner circumferential surfaces of the second and third coil bodies. A third connecting conductor is provided on the outer circumferential surfaces of the third and fourth coil bodies. [Explanation of symbols]

[0125] 1...Substrate (coil substrate, connecting conductor substrate), 3...Oxide superconducting layer (coil superconducting layer, connecting conductor superconducting layer), 10...Coil body, 10A...First coil body, 10B...Second coil body, 11A, 11B...Outer peripheral surface, 12A, 12B...Inner peripheral surface, 20, 120, 220, 320, 420, 520, 620, 720...Connecting conductor, 20A...First length region (region including one end), 20B...Second length region (region including the other end), 30...Oxide superconducting wire (superconducting wire), 50...Oxide superconducting wire (superconducting wire), 100, 200, 300, 40 0,500,600,700,800...superconducting coil, 220A...first connecting conductor (first member), 220Aa...first end (one end), 220Ab...second end (other end), 220B, 320B, 420B, 520B, 620B...second connecting conductor (second member), 320B1...first length region (region including one end), 320B2...second length region (region including the other end), 320Ba, 420Ba, 520Ba...first end (one end), 320Bb, 420Bb, 520Bb...second end (other end), 320C...third connecting conductor (third member), C...winding axis.

Claims

1. At least two coil bodies formed by winding a tape-shaped superconducting wire, and a tape-shaped connecting conductor that electrically connects the two coil bodies, The two coil bodies are stacked in a winding axis direction of the coil bodies, the connecting conductor is wound around the outer circumferential surfaces of the two coil bodies over the entire circumference via a conductive bonding layer; the connecting conductors overlap each other at least in a circumferential portion of the coil body, The connecting conductor includes a tape-shaped first member wound around an outer circumferential surface of the coil body and having both ends facing each other; a tape-like second member overlapping an outer peripheral surface of the first member; The second member spans at least a region including one end of the first member to a region including the other end of the first member, The second member is wound around the outer circumferential surface of the first member one or more times. Superconducting coil.

2. 2. The superconducting coil according to claim 1, wherein the connecting conductor is wound around the outer circumferential surface of the coil body two or more times.

3. Further comprising a tape-shaped third member overlapping an outer peripheral surface of the second member, the second member is wound around the outer circumferential surface of the first member such that both ends face each other, 2. The superconducting coil according to claim 1, wherein the third member spans from a region including one end of the second member to a region including the other end of the second member.

4. The superconducting wire constituting the coil body has a tape-shaped coil base material and a coil superconducting layer laminated on the coil base material, and is oriented so that the coil superconducting layer faces outward, The superconducting coil according to any one of claims 1 to 3, wherein the connection conductor is composed of a superconducting wire having a tape-shaped connection conductor substrate and a connection conductor superconducting layer laminated on the connection conductor substrate, and is oriented with the connection conductor superconducting layer facing inward.

5. the first member is made of a superconducting wire; The superconducting coil according to any one of claims 1 to 4, wherein the second member is made of a metal tape.

6. The first member is wound around the outer circumferential surface of the coil body more than once, 6. The superconducting coil according to claim 5, wherein said second member is wound around an outer circumferential surface of said first member more than once.

7. 7. The superconducting coil according to claim 1, wherein the width of the connecting conductor is equal to or smaller than the total width of the two coil bodies in the stacking direction.

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