Method for manufacturing superconducting coil and superconducting coil

Abstract

To provide a method for manufacturing a superconducting coil with which the performance of the superconducting coil can be easily improved.SOLUTION: In a winding member manufacturing step, a superconducting wire rod and a co-winding wire rod are co-wound around a winding central shaft to manufacture a winding member. The co-winding wire rod is a prepreg including a prepreg base material and a prepreg resin layer. Here, heat treatment of fusing the prepreg resin layer after co-winding the superconducting wire rod and the co-winding wire rod, to fill the prepreg resin layer fused by the heat treatment between the turns of the winding member.SELECTED DRAWING: Figure 3A

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION An embodiment of the present invention relates to a method for manufacturing a superconducting coil and a superconducting coil. [Background technology]

[0002] Superconducting devices that have been put to practical use include magnetic resonance imaging (MRI) devices, superconducting magnetic energy storage (SMES) devices, and single crystal pulling devices. Superconducting devices are equipped with superconducting coils that include winding members around which superconducting wire is wound.

[0003] When fabricating winding members for a superconducting coil, for example, high-temperature superconducting wires with excellent critical current characteristics at high temperatures and in strong magnetic fields are used as the superconducting wires. The high-temperature superconducting wires are tape wires with a multilayer structure, including a laminate in which multiple layers such as an intermediate layer, a superconducting layer, and a protective layer are stacked on a metal substrate, and the periphery of the laminate is covered with a stabilizing layer. In addition, the surface of the high-temperature superconducting wires is covered with, for example, an insulating layer.

[0004] The winding member is impregnated with a resin such as a thermosetting resin, and the spaces between the turns of the superconducting wire are filled with the resin, which allows the winding member to maintain the wound shape of the superconducting wire and also improves the heat transfer characteristics in a vacuum.

[0005] When radial stress is applied to a winding member made of superconducting wire with a multilayer structure, the stress acts on the superconducting wire as a peeling force, which may cause delamination in the superconducting wire. When delamination occurs in the superconducting wire, the superconducting properties of the superconducting coil may deteriorate. For example, when a superconducting coil is cooled to its operating temperature, a difference in thermal contraction rate occurs between the resin filled between the turns and the superconducting wire. This difference in thermal contraction rate may cause a peeling force, potentially resulting in delamination. To resolve this problem, it has been proposed to provide a release layer on the superconducting wire. The release layer reduces the adhesive strength between the superconducting wire and the resin filled between the turns. Therefore, the release layer absorbs the peeling force applied in the stacking direction, preventing delamination and suppressing deterioration of the superconducting properties. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-198469 Summary of the Invention [Problem to be solved by the invention]

[0007] When a winding member is impregnated with resin during the manufacture of a superconducting coil, the resin may not be sufficiently filled between the turns of the superconducting wire, resulting in gaps between the turns, which may result in a deterioration in the performance of the superconducting coil.

[0008] For example, vibrations and electromagnetic forces generated during operation of a superconducting coil can cause the superconducting wires to slide against each other between turns, which can wear away the insulating layer covering the surface of the superconducting wire. As a result, the insulating performance of the superconducting coil can be reduced. Furthermore, gaps between the turns can reduce the thermal conductivity. As a result, thermal runaway can occur in the superconducting coil, which can reduce the reliability of the superconducting coil.

[0009] In particular, when the viscosity of the thermosetting resin with which the winding member is impregnated is high, the possibility of the above-mentioned problems occurring increases.

[0010] As a method for filling the spaces between the turns of the superconducting wire with resin, in addition to the method of impregnating the winding members with resin, there is also a method of winding while dripping resin between the turns, etc. However, even in this case, there is variation in the amount of resin filled between the turns, so it is not easy to obtain sufficient performance from the superconducting coil.

[0011] Therefore, an object of the present invention is to provide a method for manufacturing a superconducting coil that can easily improve the performance of the superconducting coil. [Means for solving the problem]

[0012] A method for manufacturing a superconducting coil according to an embodiment includes a winding member fabrication step of fabricating a winding member by co-winding a superconducting wire material and a co-winding wire material around a winding central axis. The co-winding wire material is a prepreg including a prepreg base material and a prepreg resin layer. When the winding member is fabricated, the prepreg base material has a first prepreg base material surface located on the inner side in the radial direction of the winding central axis and a second prepreg base material surface located on the outer side in the radial direction. The prepreg resin layer is formed of a resin material so as to cover at least one of the first prepreg base material surface and the second prepreg base material surface. In the winding member fabrication step, after co-winding the superconducting wire material and the co-winding wire material, a heat treatment is performed to melt the prepreg resin layer, and the prepreg resin layer melted by the heat treatment is filled between the turns of the winding member. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view schematically showing a partially exploded view of a superconducting coil 10 according to an embodiment. [Figure 2] FIG. 2 is a flow chart showing an example of a method for manufacturing the superconducting coil 10 according to the embodiment. [Figure 3A] FIG. 3A is a cross-sectional view that schematically shows a state when a winding step (ST11) is performed in the winding member fabrication process of the embodiment. [Figure 3B] FIG. 3B is a cross-sectional view that schematically shows a state when a heat treatment step (ST12) is performed in the winding member fabrication process of the embodiment. [Figure 4] FIG. 4 is a partially exploded perspective view of superconducting wire main body 200 constituting superconducting wire 20 in the embodiment. [Figure 5A] FIG. 5A is a cross-sectional view that schematically shows a state when a winding step (ST11) is performed in the winding member fabrication process of Modification 1. FIG. [Figure 5B] FIG. 5B is a cross-sectional view that schematically shows a state when the heat treatment step (ST12) is performed in the winding member fabrication step of Modification 1. As shown in FIG. [Figure 6] FIG. 6 is a cross-sectional view that schematically shows the common winding wire material 30 used in the winding step (ST11) in the second modification. DETAILED DESCRIPTION OF THE INVENTION

[0014] [A] Configuration of superconducting coil 10 An example of the configuration of the superconducting coil 10 according to the embodiment will be described.

[0015] FIG. 1 is a perspective view schematically showing a partially exploded view of a superconducting coil 10 according to an embodiment.

[0016] In this embodiment, the superconducting coil 10 has a winding member 12 and a side plate 14, as shown in FIG.

[0017] [A-1] Winding member 12 The winding member 12 has, for example, a pancake shape, and is produced by winding the superconducting wire material 20 and the co-winding wire material 30 around the bobbin 11 .

[0018] In this embodiment, the reel 11 has a cylindrical shape having a central winding axis AX (central axis).

[0019] The superconducting wire 20 and the co-winding wire 30 are tape wires, and are wound concentrically in the circumferential direction CD around the bobbin 11. That is, the superconducting wire 20 and the co-winding wire 30 are wound together around the winding center axis AX, and multiple turns of the superconducting wire 20 and the co-winding wire 30 are alternately stacked in the radial direction RD of the winding center axis AX.

[0020] The superconducting wire 20 and the co-wound wire 30 will be described in detail later.

[0021] [A-2] Side plate 14 The side plates 14 are installed on the side surfaces of the winding member 12 along the radial direction RD of the winding center axis AX in order to maintain the shape of the winding member 12. The side plates 14 are, for example, ring-shaped plate bodies, and are coaxial with the winding member 12. The side plates 14 are made of an insulating material such as glass fiber reinforced plastic (GFRP).

[0022] A cooling plate (not shown) for conducting cooling of the superconducting coil 10 may be provided on the superconducting coil 10.

[0023] [B] Manufacturing method of superconducting coil 10 FIG. 2 is a flow diagram showing an example of a method for manufacturing the superconducting coil 10 according to the embodiment.

[0024] As shown in FIG. 2, in the winding member fabrication process, a winding step (ST11) and a heat treatment step (ST12) are carried out in sequence to fabricate the winding member 12.

[0025] 3A and 3B are cross-sectional views schematically showing a state where a winding step (ST11) is performed in the winding member fabrication process of the embodiment, and a state where a heat treatment step (ST12) is performed in the winding member fabrication process of the embodiment.

[0026] 3A and 3B show a portion corresponding to a cross section (e.g., an xz plane) along the winding central axis AX in FIG. 1. In FIGS. 3A and 3B, the vertical direction (z) corresponds to the axial direction along the winding central axis AX. In FIGS. 3A and 3B, the horizontal direction (x) corresponds to the radial direction RD of the winding central axis AX, with the left side being the inner circumferential side IN and the right side being the outer circumferential side OT. In FIGS. 3A and 3B, the direction (y) perpendicular to the paper surface corresponds to the tangential direction to the circumferential direction (winding direction) of the winding central axis AX. Each step will be described in detail using FIGS. 3A and 3B.

[0027] [B-1] Winding process (ST11) In the winding step (ST11), as shown in Fig. 3A, the superconducting wire 20 and the co-winding wire 30 are wound together. By the co-winding, the superconducting wire 20 and the co-winding wire 30 are wound around the bobbin 11. As a result, the superconducting wire 20 and the co-winding wire 30 are alternately stacked for multiple turns in the radial direction RD of the winding center axis AX.

[0028] The superconducting wire 20 and the co-winding wire 30 used in the winding step (ST11) will be described in detail.

[0029] [B-1-1] Superconducting wire 20 In this embodiment, as shown in FIG. 3A, a tape wire (high-temperature superconducting wire) in which an insulating coating layer 210 and a release layer 220 are provided on a superconducting wire main body 200 is used as superconducting wire 20.

[0030] In the superconducting wire 20, the superconducting wire main body 200 has a rectangular cross section. When the winding step (ST11) is performed, the superconducting wire main body 200 has a first main body surface S201 located on the inner periphery side IN in the radial direction RD and a second main body surface S202 located on the outer periphery side OT in the radial direction RD. The insulating coating layer 210 covers the first main body surface S201 and the second main body surface S202, and also covers portions of the surface of the superconducting wire main body 200 other than the first main body surface S201 and the second main body surface S202. That is, in the superconducting wire 20 of this embodiment, the entire periphery of the superconducting wire main body 200 is covered with the insulating coating layer 210. Superconducting wire 20 of the present embodiment is provided with release layer 220 so as to cover second main body surface S202 with insulating cover layer 210 interposed therebetween.

[0031] In the superconducting wire 20, the insulating coating layer 210 is formed of an insulating material. The insulating material constituting the insulating coating layer 210 is a resin such as polyvinyl formal, polyvinyl butyral, polyester, polyurethane, polyamide, polyamideimide, or polyimide, and a mixture of multiple resins may also be used. The insulating coating layer 210 covers the periphery of the superconducting wire main body 200 with a uniform thickness.

[0032] In superconducting wire 20, release layer 220 is made of a release material. The release material constituting release layer 220 is a resin such as a fluororesin. Here, release layer 220 is formed in advance on superconducting wire 20. Alternatively, release layer 220 may be formed on superconducting wire 20 by applying a release material when performing winding step (ST11).

[0033] The superconducting wire main body 200 will be further described in detail.

[0034] Fig. 4 is an exploded perspective view of a part of superconducting wire main body 200 constituting superconducting wire 20 in the embodiment. Fig. 4 schematically shows the state before winding is performed.

[0035] As shown in FIG. 4, superconducting wire main body 200 has a multilayer structure including, for example, metal substrate 201, orientation layer 202, intermediate layer 203, superconducting layer 204, protective layer 205, and stabilizing layer 206.

[0036] The metal substrate 201 is in the form of a tape and is made of a high-strength metal material such as stainless steel or a nickel alloy such as Hastelloy (registered trademark).

[0037] The alignment layer 202 is laminated on the surface of the metal substrate 201. The alignment layer 202 is made of a material such as magnesium oxide, and is provided to orient the intermediate layer 203.

[0038] Intermediate layer 203 is laminated on the surface of metal substrate 201 with orientation layer 202 interposed therebetween. Intermediate layer 203 is made of a material such as cerium oxide, magnesium oxide, yttrium oxide, or ytterbium oxide. Intermediate layer 203 functions as a buffer layer that alleviates thermal distortion that occurs between metal substrate 201 and superconducting layer 204 due to thermal contraction.

[0039] Superconducting layer 204 is laminated on the surface of metal substrate 201, with orientation layer 202 and intermediate layer 203 interposed in that order. Superconducting layer 204 is made of a Re123-based high-temperature superconductor (RE-based oxide superconducting wire material) such as YBCO, DyBCO, or GdBCO.

[0040] Protective layer 205 is laminated on the surface of metal substrate 201 with orientation layer 202, intermediate layer 203, and superconducting layer 204 interposed in that order. Protective layer 205 is made of a material such as silver. Protective layer 205 is provided for the purpose of preventing superconducting layer 204 from being deteriorated due to contact with moisture in the air. Protective layer 205 functions as a bypass path for current commutation when excessive electricity flows in superconducting layer 204.

[0041] Stabilization layer 206 covers the periphery of the laminate of metal substrate 201, orientation layer 202, intermediate layer 203, superconducting layer 204, and protective layer 205. Stabilization layer 206 is made of a conductive material such as copper or silver. Like protective layer 205, stabilization layer 206 functions as a bypass path for commutating current when excessive electricity flows in superconducting layer 204.

[0042] In superconducting wire main body 200, orientation layer 202 and protective layer 205 may be omitted as appropriate depending on the required properties.

[0043] [B-1-2] Co-wound wire material 30 As shown in FIG. 3A, in this embodiment, a tape wire made of prepreg in which a prepreg resin layer 310 is provided on a prepreg base material 300 is used as the co-wound wire material 300.

[0044] In the co-winding wire material 30, when the winding step (ST11) is performed, the prepreg base material 300 has a first prepreg base material surface S301 located on the inner circumferential side IN in the radial direction RD and a second prepreg base material surface S302 located on the outer circumferential side OT in the radial direction RD. A prepreg resin layer 310 is formed on the first prepreg base material surface S301, and another prepreg resin layer 310 is formed on the second prepreg base material surface S302. The prepreg resin layer 310, for example, covers the entire first prepreg base material surface S301 and the entire second prepreg base material surface S302. The prepreg resin layer 310 has a thickness of, for example, 1 μm to 20 μm, and is applied to the surface of the prepreg base material 300 so as to have a uniform thickness.

[0045] In the co-wound wire material 30, the prepreg base material 300 is formed, for example, from a resin material. The resin material constituting the prepreg base material 300 is polyimide, polyethylene terephthalate (PET), aramid resin, or the like, and has insulating properties. In addition to the above, the prepreg base material 300 may also be made from a conductive metal material if insulating properties are not required.

[0046] In the co-winding material 30, the prepreg resin layer 310 is formed of a resin material. The resin material constituting the prepreg resin layer 310 is, for example, a thermosetting resin. The thermosetting resin may be an epoxy resin, an acrylic resin, a formal resin, a urethane resin, or a polyester resin, and a mixture of multiple resins may also be used.

[0047] The resin material constituting the prepreg resin layer 310 may be a thermoplastic resin other than a thermosetting resin. Thermoplastic resins include polyamide, polycarbonate, polyester, polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyurethane, etc., and a mixture of multiple resins may also be used.

[0048] [B-2] Heat treatment process (ST12) As shown in FIG. 2, in the winding member manufacturing process, after the winding step (ST11) is performed, a heat treatment step (ST12) is performed.

[0049] In the heat treatment process (ST12), as shown in FIG. 3B, a side plate 14 is placed on the side of the winding member 12 (see FIG. 3A) in the radial direction RD of the winding center axis AX in which the superconducting wire material 20 and the co-winding wire material 30 are co-wound, and then heat treatment is performed.

[0050] Here, the side plate 14 is a prepreg coated on one surface with an adhesive resin layer 141, and the side plate 14 is attached to the winding member 12 so that the surface of the side plate 14 coated with the adhesive resin layer 141 faces the side surface of the winding member 12. The adhesive resin layer 141 is formed of an adhesive material such as epoxy resin.

[0051] Then, heat treatment is performed to melt the prepreg resin layer 310 constituting the common winding material 30 and the adhesive resin layer 141 provided on the side plate 14. The prepreg resin layer 310 melted by the heat treatment fills the spaces between the turns of the winding member 12 (between the Nth turn and the adjacent (N+1)th turn), and the adhesive resin layer 141 provided on the side plate 14 fills the spaces between the winding member 12 and the side plate 14. If the prepreg resin layer 310 and the adhesive resin layer 141 are thermosetting resins, the thermosetting resin is hardened by the heat treatment. As a result, the turns of the winding member 12 are bonded together, and the winding member 12 and the side plate 14 are bonded together, thereby completing the winding member 12. Note that the heat treatment step (ST12) may be performed after the winding step (ST11) is performed with the side plate 14 placed on the reel 11.

[0052] [C] Summary As described above, in this embodiment, the superconducting wire 20 and the co-winding wire material 30 are wound together around the winding central axis AX to produce the winding member 12. In this embodiment, the co-winding wire material 30 is a prepreg in which the prepreg resin layer 310 is formed on the prepreg base material 300.

[0053] In this embodiment, the superconducting wire 20 and the co-winding wire material 30, which is a non-adhesive prepreg, are co-wound, making winding easy. After co-winding the superconducting wire 20 and the co-winding wire material 30, a heat treatment is performed to melt the prepreg resin layer 310, and the prepreg resin layer 310 formed by the heat treatment fills the spaces between the turns of the winding member 12. That is, in this embodiment, the winding member is not impregnated with a resin such as a thermosetting resin, but the prepreg resin layer 310 formed in advance on the prepreg base material 300 is melted and filled between the turns. Therefore, in this embodiment, the resin is sufficiently and accurately filled between the turns, preventing gaps from being formed between the turns. As a result, this embodiment can improve the performance of the superconducting coil 10. Specifically, this embodiment can prevent the insulating layer formed on the surface of the superconducting wire 20 from wearing between the turns due to vibrations and electromagnetic forces generated during operation of the superconducting coil 10, thereby preventing a deterioration in the insulating performance of the superconducting coil 10. Furthermore, in this embodiment, it is possible to prevent a decrease in thermal conductivity due to gaps between the turns, and therefore it is possible to suppress the occurrence of thermal runaway in the superconducting coil 10, thereby improving the reliability of the superconducting coil 10.

[0054] In the superconducting coil 10 of this embodiment, the superconducting wire main body 200 constituting the superconducting wire 20 has a multilayer structure in which multiple layers are stacked in the stacking direction. As already mentioned, when stress is applied as a peeling force in the stacking direction (radial direction) to the superconducting wire main body 200, delamination may occur. If delamination occurs in the superconducting wire main body 200, the superconducting characteristics of the superconducting coil 10 may deteriorate. For example, when the superconducting coil 10 is cooled to an operating temperature, a difference in thermal contraction rate occurs between the molten prepreg resin layer 310 and the superconducting wire 20 between the turns. This difference in thermal contraction rate may cause a peeling force, potentially resulting in delamination. However, in the superconducting coil 10 of this embodiment, the superconducting wire 20 includes a release layer 220. In this embodiment, the release layer 220 acts to reduce the adhesive force between the superconducting wire 20 and the melted prepreg resin layer 310 in the co-wound wire 30. Therefore, in this embodiment, the peeling force is absorbed by the release layer 220. Therefore, in this embodiment, it is possible to effectively prevent delamination, thereby suppressing deterioration of the superconducting characteristics.

[0055] [D] Variation A modification of the above embodiment will now be described.

[0056] [D-1] Variation 1 Fig. 5A is a cross-sectional view schematically showing a state when a winding step (ST11) is performed in the winding member fabrication process of Modification 1. Fig. 5B is a cross-sectional view schematically showing a state when a heat treatment step (ST12) is performed in the winding member fabrication process of Modification 1.

[0057] 5A and 5B, similar to the cases of Figures 3A and 3B, show a portion corresponding to a part of a cross section (e.g., an xz plane) along the central winding axis AX in Figure 1. Details of each step will be explained in order using Figures 5A and 5B.

[0058] [D-1-1] Winding process (ST11) In the winding step (ST11) (see FIG. 2) of this modified example, as shown in FIG. 5A, superconducting wire 20 and co-winding wire 30 are co-wound, as in the case of the above embodiment (see FIG. 3A). However, in this modified example, the configurations of superconducting wire 20 and co-winding wire 30 used in the winding step (ST11) are different from those in the above embodiment (see FIG. 3A).

[0059] The superconducting wire 20 and the co-wound wire 30 used in this modification will be described.

[0060] [D-1-1-1] Superconducting wire 20 5A, a tape wire (high-temperature superconducting wire) having an insulating coating layer 210 provided on a superconducting wire main body 200 is used as superconducting wire 20. However, in this modification, unlike the above embodiment, superconducting wire 20 is not provided with release layer 220 (see FIG. 3A).

[0061] [D-1-1-2] Co-wound wire material 30 5A, the present modification uses a tape wire made of prepreg in which a prepreg resin layer 310 is provided on a prepreg base material 300 as the co-wound wire material 30. However, in the present modification, the prepreg resin layer 310 is formed on the second prepreg base material surface S302 of the prepreg base material 300, but unlike the above embodiment, the prepreg resin layer 310 is not formed on the first prepreg base material surface S301 of the prepreg base material 300 (see FIG. 3A).

[0062] [D-2] Heat treatment process (ST12) In the winding member manufacturing process of this modified example, after the winding step (ST11) is performed, a heat treatment step (ST12) is also performed (see FIG. 2).

[0063] 5B , in the heat treatment step (ST12) of this modified example, side plates 14 are placed on the side surfaces of winding member 12, in which superconducting wire 20 and co-winding wire material 30 are wound together, and then the heat treatment is performed. As a result, the turns of winding member 12 are bonded together and winding member 12 is bonded to side plates 14, thereby producing winding member 12.

[0064] [D-3] Actions and Effects As described above, in this modification, as in the above embodiment, the winding member 12 is fabricated by co-winding the superconducting wire material 20 and the prepreg co-winding wire material 30. Therefore, in this modification, as in the above embodiment, it is possible to prevent gaps from being present between turns, thereby improving the reliability of the superconducting coil 10.

[0065] As described above, in this modification, superconducting wire 20 does not have release layer 220 on the side of second main body surface S202, unlike the above embodiment. Co-winding wire 30 does not have prepreg resin layer 310 on first prepreg base surface S301 of prepreg base material 300, unlike the above embodiment (see FIG. 3A ). Therefore, in winding member 12 of this modification, the surface of superconducting wire 20 facing second main body surface S202 is not bonded to first prepreg base surface S301 of prepreg base material 300 by molten prepreg resin layer 310. In other words, in winding member 12 of this modification, insulating coating layer 210 covering the surface of superconducting wire 20 and prepreg base material 300 constituting co-winding wire 30 are not bonded in the radial direction RD, and include a portion where they can be separated from each other. This separable portion functions in the same manner as release layer 220. Therefore, in this modification, superconducting wire 20 is not provided with release layer 220, but it is possible to prevent delamination in superconducting wire 20, similar to the above embodiment in which superconducting wire 20 is provided with release layer 220.

[0066] As can be seen from this modification, in the co-wound wire material 30, the prepreg resin layer 310 may be provided on both the first prepreg base material surface S301 and the second prepreg base material surface S302, or it may be provided on one of the first prepreg base material surface S301 and the second prepreg base material surface S302. In other words, it is sufficient that the prepreg resin layer 310 is formed so as to cover at least one of the first prepreg base material surface S301 and the second prepreg base material surface S302.

[0067] As can be seen from this modification, superconducting wire 20 does not necessarily have to be provided with release layer 220. In addition to being provided on second main body surface S202 of superconducting wire 20, release layer 220 may also be provided on first main body surface S201, or on both first main body surface S201 and second main body surface S202. That is, release layer 220 may be provided on at least one of first main body surface S201 and second main body surface S202. However, it is preferable that release layer 220 not be provided on the portion of the surface of superconducting wire 20 to which side plate 14 is attached, in order to prevent peeling of side plate 14. Peeling of side plate 14 may reduce heat transfer performance and result in insufficient conduction cooling.

[0068] [D-2] Variation 2 FIG. 6 is a cross-sectional view that schematically shows the common winding wire material 30 used in the winding step (ST11) in the second modification.

[0069] 6 shows a cross section (e.g., xy plane) along the longitudinal direction of the common winding material 30 before winding. In Fig. 6, the vertical direction (x) substantially corresponds to the radial direction RD of the winding member 12, the horizontal direction (y) substantially corresponds to the circumferential direction (winding direction) of the winding member 12, and the direction perpendicular to the paper surface (z) substantially corresponds to the axial direction of the winding member 12.

[0070] The common winding material 30 of this modified example is formed on the prepreg base material 300 so that, when the winding member 12 is produced, a plurality of prepreg resin layers 310 are positioned at intervals in the winding direction of the winding member 12 (here, the y direction; the longitudinal direction of the common winding material 30). In other words, the prepreg resin layers 310 are applied to the prepreg base material 300 so that the prepreg base material 300 includes a portion where the first prepreg base material surface S301 is exposed and a portion where the second prepreg base material surface S302 is exposed.

[0071] Therefore, in the winding member 12 produced using the co-winding wire material 30 of this modification, similar to the case of modification 1, the superconducting wire material 20 and the co-winding wire material 30 are not bonded to each other and include a portion where the two can be separated. As described in modification 1, this portion where the superconducting wire material 20 can be separated functions in the same way as the release layer 220. Therefore, in this modification, it is possible to more effectively prevent delamination from occurring in the superconducting wire material 20.

[0072] [D-3] Other variations In the above embodiment, the case where the surface of the superconducting wire 20 is covered with the insulating coating layer 210 has been exemplified, but this is not limiting. The superconducting wire 20 may not have the insulating coating layer 210 depending on the required insulating properties. When the insulating coating layer 210 is provided to obtain sufficient insulating properties between turns, it is preferable to cover at least one of the first main body surface S201 and the second main body surface S202 with the insulating coating layer 210.

[0073] <Other> Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0074] 10: superconducting coil, 11: winding frame, 12: winding member, 14: side plate, 20: superconducting wire, 30: co-winding wire, 200: superconducting wire main body, 201: metal substrate, 202: orientation layer, 203: intermediate layer, 204: superconducting layer, 205: protective layer, 206: stabilizing layer, 210: insulating coating layer, 220: release layer, 300: prepreg base material, 310: prepreg resin layer, S201: first main body surface, S202: second main body surface, S301: first prepreg base material surface, S302: second prepreg base material surface, AX: winding central axis

Claims

1. A winding member manufacturing process in which a winding member is manufactured by co-winding a superconducting wire material and a co-winding wire material around a winding central axis. A method for manufacturing a superconducting coil, comprising: The co-winding wire material is a prepreg base material having, when the winding member is produced, a first prepreg base material surface located on the inner circumferential side in a radial direction of the winding central axis and a second prepreg base material surface located on the outer circumferential side in the radial direction; a prepreg resin layer formed of a resin material so as to cover at least one of the first prepreg base material surface and the second prepreg base material surface; A prepreg comprising: In the winding member fabrication step, after the superconducting wire material and the co-winding wire material are co-wound, a heat treatment is performed to melt the prepreg resin layer, and the prepreg resin layer melted by the heat treatment is filled between the turns of the winding member. A method for manufacturing a superconducting coil.

2. The superconducting wire is a superconducting wire main body portion having a first main body surface located on an inner circumferential side in the radial direction and a second main body surface located on an outer circumferential side in the radial direction when the winding member is fabricated in the winding member fabrication step; an insulating coating layer formed of an insulating material so as to cover at least one of the first body surface and the second body surface; Equipped with The method for manufacturing a superconducting coil according to claim 1.

3. The superconducting wire is a release layer formed of a release material on at least one of the first body surface and the second body surface; Further comprising: The method for manufacturing a superconducting coil according to claim 2.

4. The co-winding wire material is the prepreg resin layers are formed on the prepreg base material such that, when the winding member is fabricated in the winding member fabrication step, the plurality of prepreg resin layers are positioned at intervals in the winding direction of the winding member; The method for manufacturing a superconducting coil according to claim 1.

5. a side plate provided on a side surface of the winding member along the radial direction of the winding central axis; Equipped with 5. The superconducting coil according to claim 1.

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