JP5269556B2 - Superconducting coil manufacturing method and superconducting coil manufacturing apparatus - Google Patents

Description

The present invention relates to a superconducting coil manufacturing method and a superconducting coil manufacturing apparatus.

  As a method for insulating a superconducting coil, a prepreg insulation method, an impregnation insulation method, and the like are mainly known. The prepreg insulation method is an insulation method in which a prepreg insulating material is wound around a superconducting conductor in advance and molded into a coil shape, and the superconducting conductor is strongly brought into surface contact and cured during heat treatment (see, for example, Patent Documents 1 and 2). The impregnation insulation method is an insulation method in which a superconducting conductor is molded into a coil shape, and then an insulating resin is injected and cured in an impregnation container. In particular, a vacuum pressure impregnation method (VPI) is well known (for example, Patent Document 3).

Japanese Patent Laid-Open No. 7-130531 Patent 3739810 JP 2001-189226 A

  In the prepreg insulation method, it is necessary to pressurize the prepreg insulating material in order to obtain sufficient adhesion strength between superconducting conductors, and heat treatment is performed while compressing both in the coil axial direction and the coil radial direction. At this time, the semi-curable resin contained in the prepreg insulating material is extruded, and the dimension between the superconducting conductors changes. For large coils, especially pancake coils with a wide winding width, even if the amount of displacement between turns in the coil radial direction is slight, the amount of displacement cannot be ignored at the innermost or outermost periphery. If the inner peripheral side is displaced due to displacement of the conductor end portion or winding disturbance, distortion occurs in the superconducting conductor and the superconducting characteristics are deteriorated.

  In the impregnation insulation method, the superconducting conductor does not move because the resin is injected after molding the coil, but voids are generated inside the coil (inside the injected resin), causing problems such as cracks due to stress concentration, deterioration of insulation characteristics, and deterioration of heat conduction characteristics. cause. In particular, the tendency is remarkable in the case of a large coil or a coil with a polyimide tape interposed, and the long-term reliability remains uneasy.

The present invention was made in order to solve the above-mentioned problem, suppressing the displacement of the superconducting conductor in the coil radial direction during the heat treatment, while reducing the displacement amount at the innermost periphery and the outermost periphery, An object of the present invention is to provide a method and an apparatus for manufacturing a superconducting coil that realizes sufficient adhesive strength between superconducting conductors and is excellent in insulation characteristics and long-term reliability.

  In order to achieve the above object, according to one aspect of the present invention, a step of covering the outer periphery of a superconducting conductor with a first prepreg insulating member and winding the superconducting conductor, and covering with the first prepreg insulating member is performed. A step of covering at least one of the upper surface and the lower surface of the superconducting conductor with a second prepreg insulating member; and heating the superconducting conductor, the first prepreg insulating member, and the second prepreg insulating member. And filling the gap between the superconducting conductors with the resin in the first prepreg insulating member and the second prepreg insulating member, and the rigidity of the second prepreg insulating member during the heat treatment is The present invention relates to a method of manufacturing a superconducting coil, which is smaller than the rigidity of one prepreg insulating member.

  Further, according to one aspect of the present invention, the outer periphery of the plurality of superconducting conductors is covered with the first prepreg insulating member and wound and arranged in the first direction, and the first prepreg insulating member is covered. Laminating the plurality of superconducting conductors in a second direction perpendicular to the first direction with at least one layer separation with a second prepreg insulating member, the plurality of superconducting conductors, Heat treatment is performed on one prepreg insulating member and the second prepreg insulating member, and the resin in the first prepreg insulating member and the second prepreg insulating member is filled in the gaps of the plurality of superconducting conductors. And manufacturing the superconducting coil, wherein the rigidity of the second prepreg insulating member is smaller than the rigidity of the first prepreg insulating member during the heat treatment. Law on.

  According to the above aspect, in the case of a single-layer superconducting coil, at least the upper and lower surfaces of the superconducting conductor covered with the first prepreg insulating member by coating the outer periphery of the superconducting conductor with the first prepreg insulating member. One is covered with a second prepreg insulating member. In the case of a multi-layer superconducting coil, the outer periphery of the superconducting conductor is covered with a first prepreg insulating member, wound and arranged in the first direction, and the superconducting conductor covered with the first prepreg insulating member. In a second direction perpendicular to the first direction, the second prepreg insulating member separates and laminates at least one place.

  Then, the first prepreg insulating member and the second prepreg insulating member are heat-treated, and the semi-cured resin constituting these prepregs is filled in the gap (for example, between turns) of the superconducting conductor and solidified. I am doing so.

  At this time, the rigidity of the second prepreg insulating member during the heat treatment is made smaller than the rigidity of the first prepreg insulating member. Therefore, it is possible to sufficiently secure the adhesive strength between the plurality of superconducting conductors while suppressing the superconducting conductor during the heat treatment from being displaced in the turn direction or the first direction. Accordingly, it is possible to provide a superconducting coil having good superconducting characteristics free from turbulence or distortion by sufficiently reducing the amount of displacement at the end of the superconducting coil finally obtained, that is, the innermost or outermost circumference. it can.

  Also, unlike the impregnation insulation method, resin is not injected after the superconducting coil is molded, but the resin contained in the prepreg insulating member is flowed out and filled in the gap in the molding process of the superconducting coil by the heat treatment described above. It is hard for voids to occur. Therefore, it is possible to reduce risks such as cracks due to stress concentration, deterioration of insulation characteristics, and deterioration of heat conduction characteristics. For this reason, the superconducting coil excellent in long-term reliability can be provided.

  The first direction and the second direction correspond to a radial direction and an axial direction in a so-called pancake coil, respectively. The turn direction (row direction) and the layer direction correspond to a radial direction and an axial direction in a so-called pancake coil, respectively. Further, “at least one place” means that, for example, when the superconducting coil is composed of four layers, the second prepreg insulating member is disposed between the first layer and the second layer and between the third layer and the fourth layer. However, in addition to the so-called thinning out in which the second prepreg insulating member is not disposed between the second layer and the third layer, the second prepreg insulating member exists in a part of the adjacent layer. In such a case, it has both meanings.

  As an example of the above aspect, instead of covering the outer periphery of the superconducting conductor, the first prepreg insulating member is disposed between the superconducting conductors adjacent in the first direction, and the superconducting conductor A solid insulating member covering the outer periphery can be provided. In this case, the superconducting conductor can be surely insulated, which is particularly advantageous when the superconducting coil is enlarged. The solid insulating member can be composed of a polyimide film or the like.

  Even in this case, since the rigidity of the second prepreg insulating member during the heat treatment is made smaller than the rigidity of the first prepreg insulating member, similarly to the above, The first prepreg insulating member can sufficiently secure the adhesive strength between the superconducting conductors while suppressing displacement of the superconducting conductors in the first direction. Accordingly, it is possible to provide a superconducting coil having good superconducting characteristics free from turbulence or distortion by sufficiently reducing the amount of displacement at the end of the superconducting coil finally obtained, that is, the innermost or outermost circumference. it can.

  Similarly, voids are unlikely to occur in the resin, and risks such as cracks due to stress concentration, deterioration of insulation characteristics, and deterioration of heat conduction characteristics can be reduced. For this reason, the superconducting coil excellent in long-term reliability can be provided.

  In addition, in the present invention, “lamination” means that superconducting conductors completely separated from each other are stacked, and layer formation is performed using a single continuous superconducting conductor or a combination of different superconducting conductors. It also means the case where it is multi-layered. For example, after a single superconducting conductor is wound and arranged in the first direction to form the first superconducting conductor, the superconducting conductor is extended upward, and further on the first layer. It refers to the case where a second layer of superconducting conductor is formed by winding and arranging in the first direction. Alternatively, after the superconducting conductor is wound and arranged in the first direction to form the first superconducting conductor, the superconducting conductor is extended upward, and another superconducting conductor is connected to the first layer. It also refers to the case where a second layer of superconducting conductor is formed by further winding on the eye and arranging in the first direction.

  Another embodiment of the present invention relates to a superconducting coil, which is manufactured based on the above manufacturing method.

  Furthermore, an aspect of the present invention is the above-described superconducting coil manufacturing apparatus, a frame housing a superconducting conductor having a multilayer multi-row structure, heating means for heating the superconducting conductor having a multi-layer multi-row structure, and the heat treatment The present invention relates to an apparatus for manufacturing a superconducting coil, comprising: an exhaust means for reducing the pressure inside the frame and reducing the pressure between the superconducting conductors to lower than atmospheric pressure.

As described above, according to the present invention, it is possible to suppress the displacement of the superconducting conductor in the turn direction or the first direction during the heat treatment, and reduce the displacement amount at the innermost periphery and the outermost periphery. It is possible to provide a method and an apparatus for manufacturing a superconducting coil that realizes sufficient bonding strength between superconducting conductors and is excellent in insulation characteristics and long-term reliability.

  Hereinafter, details of the present invention, other features, and advantages will be described based on embodiments.

(First embodiment)
FIG. 1 is a partially cutaway view showing a schematic configuration of a superconducting coil according to this embodiment, and FIG. 2 is a winding of a superconducting conductor as shown in a region “A” constituting the superconducting coil shown in FIG. FIG. 4 is a process diagram in a manufacturing process for realizing a stacked state. In this embodiment, a so-called pancake type superconducting coil is shown.

  As shown in FIGS. 1 and 2, the superconducting coil 10 of this aspect has superconducting conductors 11 laminated in two layers in the axial direction, and is arranged in five rows in the radial direction. The outer periphery of the superconducting conductor 11 is covered with the first prepreg insulating member 12, and the layers are separated by the second prepreg insulating member 13 in the stacking direction of the superconducting conductor 11, that is, the axial direction. The lower surface of the superconducting conductor 11 located in the lower layer and the upper surface of the superconducting conductor 11 located in the upper layer are covered with the second prepreg insulating member 13.

  The superconducting coil 10 can be two superconducting conductors completely separated from each other. In addition, after forming the first layer superconducting conductor with a single continuous superconducting conductor, the superconducting conductor extends upward and is further wound on the first layer to be arranged in the first direction. Thus, a second layer superconducting conductor can be formed. Alternatively, after the first superconductor is formed with a single superconductor, the superconductor is extended upward and further wound on the first layer while connecting another superconductor. A second layer of superconducting conductors may be formed in the first direction.

  The superconducting conductor 11 is separated from each other in the radial direction by a plate-like insulating member 14. As an example, the insulating member 14 can be an FRP spacer having a thickness of about 0.5 mm. The shape may be a plate shape, a sheet shape, a tape shape, a string shape, or a nonwoven fabric, and the material may be FRP, glass, polyimide, or the like.

  In this aspect, it is necessary that the rigidity of the second prepreg insulating member 13 is smaller than the rigidity of the first prepreg insulating member 12 during the heat treatment. Satisfying such a requirement can be easily realized, for example, by making the resin content of the second prepreg insulating member 13 larger than the resin content of the first prepreg insulating member 12.

  Specifically, the resin content of the second prepreg insulating member 13 is 50% by weight or more, and the resin content of the first prepreg insulating member 12 is less than 50% by weight. More preferably, the resin content of the second prepreg insulating member 13 is about 70% by weight, and the resin content of the first prepreg insulating member 12 is about 20 to 40% by weight. As a result, the following effects can be realized easily and more effectively.

  As an example, the first prepreg insulating member 12 is a tape in which a polyimide film having a thickness of about 0.03 mm is sandwiched between glass tapes having a thickness of about 0.03 mm and prepreg processing is performed by containing about 40% by weight of an epoxy resin. Can be formed by winding one layer in a 1/2 layer. The second prepreg insulating member 13 can be an insulating sheet obtained by performing prepreg processing by adding about 70% by weight of an epoxy resin to a polyester felt having a thickness of about 2 mm.

  In this embodiment, the laminated body in the state shown in FIG. For example, the laminate is held at 80 ° C. for 10 hours and then held at 130 ° C. for 10 hours. At this time, by the above heat treatment, the semi-cured resin constituting the first prepreg insulating member 12 and the second prepreg insulating member 13 flows out and flows into the gap (for example, between turns) of the superconducting conductor 11 to be embedded. Thereafter, it is cured to form an insulating layer. Note that the heat treatment can be performed in a reduced-pressure atmosphere or under atmospheric pressure.

  At this time, since the rigidity of the second prepreg insulating member 13 during the heat treatment is smaller than the rigidity of the first prepreg insulating member 12, it is displaced preferentially in the axial direction rather than in the radial direction. Further, since the resin flowing out from the second prepreg insulating member is filled in the gap between the superconducting conductors 11, for example, between turns, the superconducting conductor 11 is prevented from being displaced in the radial direction, and between the conductors of the superconducting conductor 11. Produces sufficient and uniform surface pressure and exhibits sufficient adhesive strength without unevenness. Therefore, the end portion of the superconducting coil 10 finally obtained, that is, the amount of displacement at the innermost circumference or the outermost circumference is sufficiently reduced to provide the superconducting coil 10 having good superconducting characteristics free from winding disturbance and distortion. be able to.

  Also, unlike the impregnation insulation method, resin is not injected after the superconducting coil is molded, but the resin contained in the prepreg insulating member is flowed out and filled in the gap in the molding process of the superconducting coil by the heat treatment described above. It is hard for voids to occur. Therefore, it is possible to reduce risks such as cracks due to stress concentration, deterioration of insulation characteristics, and deterioration of heat conduction characteristics. For this reason, the superconducting coil excellent in long-term reliability can be provided.

  In the above heat treatment, it is preferable to reduce the pressure between the superconducting conductors 11 to be lower than the atmospheric pressure. Thereby, the resin can be easily and efficiently filled in the gap (for example, between turns) of the superconducting conductor 11.

  Moreover, it is preferable to apply pressure to the superconducting conductor 11 in at least one of the radial direction and the axial direction. In particular, when pressure is applied in the axial direction, the second prepreg insulating member 13 is compressed, and the resin that flows out of the insulating member 13 is filled between the gaps of the superconducting conductor 11, for example, between turns. Thereby, the surface pressure between the superconducting conductors 11 can be increased more effectively while suppressing the displacement of the superconducting conductors 11 in the radial direction, and a coil having higher adhesive strength can be provided. Even when the pressure is applied isotropically, the rigidity of the second prepreg insulating member 13 during the heat treatment is smaller than the rigidity of the first prepreg insulating member 12, so that the displacement is preferentially displaced in the axial direction rather than in the radial direction. And the same operation effect can be obtained.

  In this embodiment, the superconducting coil 10 is configured such that the superconducting conductors 11 are laminated in two layers in the axial direction and arranged in five rows in the radial direction. However, the number of arrangements and the number of laminations are arbitrary as required. A single layer may be used. Moreover, the superconducting conductor 11 may be single or plural.

  Moreover, although this embodiment demonstrated the case where one superconducting coil was manufactured independently, it can be applied also to a plurality of superconducting coils having substantially the same inner and outer diameters. In this case, after winding a plurality of superconducting coils, the plurality of superconducting coils can be simultaneously manufactured under the same effect as described above by stacking in the layer direction and simultaneously performing the heat treatment.

(Second Embodiment)
FIG. 3 is a process diagram according to this embodiment. FIG. 3 corresponds to FIG. 2 in the first embodiment.

  In this embodiment, instead of covering the outer periphery of the superconducting conductor 11 with the first prepreg insulating member 12, the outer periphery is covered with an insulating member 14 such as polyimide. On the other hand, the first prepreg insulating member 12 is disposed between the superconducting conductors 11 adjacent in the radial direction of the superconducting coil 10.

  Also in this case, for example, the first prepreg insulating member 12 and the second prepreg insulating member 13 are formed by heat treatment in which the laminate is held at 80 ° C. for 10 hours and then held at 130 ° C. for 10 hours. The cured resin flows out, flows into the gap (for example, between turns) of the superconducting conductor 11 and embeds it, and then hardens to form an insulating layer.

  Since the rigidity of the second prepreg insulating member 13 during the heat treatment is smaller than the rigidity of the first prepreg insulating member 12, the superconducting conductor 11 is prevented from being displaced in the radial direction while suppressing the superconducting conductor 11 from being displaced in the radial direction. Sufficient and uniform surface pressure is generated between the conductors to exhibit a sufficient adhesive strength without unevenness. Therefore, the end portion of the superconducting coil 10 finally obtained, that is, the amount of displacement at the innermost circumference or the outermost circumference is sufficiently reduced to provide the superconducting coil 10 having good superconducting characteristics free from winding disturbance and distortion. be able to.

  Also, unlike the impregnation insulation method, resin is not injected after the superconducting coil is molded, but the resin contained in the prepreg insulating member is flowed out and filled in the gap in the molding process of the superconducting coil by the heat treatment described above. It is hard for voids to occur. Therefore, it is possible to reduce risks such as cracks due to stress concentration, deterioration of insulation characteristics, and deterioration of heat conduction characteristics. For this reason, the superconducting coil excellent in long-term reliability can be provided.

  In the heat treatment, it is preferable to reduce the pressure between the superconducting conductors 11 to lower than the atmospheric pressure, and it is preferable to apply pressure to the superconducting conductor 11 in at least one of the radial direction and the axial direction. Moreover, this aspect can be applied not only to one superconducting coil but also to a plurality of superconducting coils.

  According to this aspect, the superconducting conductor 11 can be surely insulated, which is particularly advantageous when the superconducting coil 10 is enlarged.

(Third embodiment)
In this embodiment, an apparatus used for manufacturing the above-described superconducting coil 10 will be described. FIG. 4 is a schematic configuration diagram illustrating an example of an apparatus for manufacturing the superconducting coil 10.

  As shown in FIG. 4, the manufacturing apparatus 20 in this embodiment includes a bottom plate 21, a pair of side walls 22 provided so as to extend in the vertical direction so as to be connected to the bottom plate 21, and a side wall facing the bottom plate 21. 22 and an upper plate 23 provided so as to be in contact with 22. These constitute a frame, and a superconducting coil 10 in the manufacturing process (specifically, a laminated body as shown in FIGS. 2 and 3) is arranged inside the frame.

  A heater 25 is embedded in the bottom plate 21, and a pump 26 is connected to the right side wall 22 via a valve 26A.

  When the superconducting coil 10 is heated by the heater 25 using the apparatus 20 shown in FIG. 4, as described above, the semi-cured resin constituting the first prepreg insulating member 12 and the second prepreg insulating member 13 flows out, The superconducting conductor 11 flows into a gap (for example, between turns) and embeds, and the effects described in the first embodiment and the second embodiment are exhibited.

  In addition, since the pressure between the superconducting conductors 11 can be reduced by the pump 26 via the valve 26A and can be made lower than the atmospheric pressure, as described above, the gap between the superconducting conductors 11 (for example, between turns) can be simply and efficiently. Resin can flow.

  In addition, you may comprise so that a high temperature fluid may flow through the side wall 22 instead of the heater 25 mentioned above. Moreover, you may comprise so that the whole frame may be heated from the outside by radiation or gas convection.

  The bottom plate 21, the side wall 22, and the top plate 23 can be fixed to each other, but can also be configured to be slidable. In this case, even if the superconducting conductor 11 is displaced during the heat treatment of the superconducting coil 10, the bottom plate 21 and the like can follow the displacement, so that the surface pressure between the conductors of the superconducting conductor 11 is kept uniform. be able to. Therefore, as described above, a sufficient and uniform surface pressure is generated between the conductors of the superconducting conductor 11 to exhibit a sufficient adhesive strength without unevenness.

  As shown in FIG. 4, instead of connecting the pump 26 directly to the side wall 22, a frame made of the bottom plate 21 or the like is put in an airbag or the like, the inside of the airbag is decompressed by the pump 26, and the superconducting conductor It is also possible to indirectly reduce the pressure between the eleven.

  FIG. 5 is a schematic configuration diagram illustrating another example of the manufacturing apparatus for the superconducting coil 10. The manufacturing apparatus 30 shown in FIG. 5 is different from the manufacturing apparatus 20 shown in FIG. 4 in that a pressure plate 28, a bolt 28A, and a disc spring 28B are provided, and the other points are similarly configured. .

  According to the manufacturing apparatus 30 shown in FIG. 5, the superconducting conductor 11 can be constrained in the radial direction and the axial direction by the pressurizing operation described above, so that the displacement of the superconducting conductor 11 in the radial direction is suppressed. On the other hand, the surface pressure between the superconducting conductors 11 can be increased more effectively, and the above-described operational effects can be exhibited more remarkably.

  Since the manufacturing apparatus 30 shown in FIG. 5 has the same configuration as the manufacturing apparatus 20 shown in FIG. 4 except that a pressurizing mechanism is added, the same function and effect as the manufacturing apparatus shown in FIG. 4 is achieved. become.

  FIG. 6 is a schematic configuration diagram illustrating another example of the manufacturing apparatus of the superconducting coil 10. The manufacturing apparatus 40 shown in FIG. 6 is provided with a pressure plate 28 and a bolt 28 </ b> A with respect to the manufacturing apparatus 20 shown in FIG. 4, and injects a fluid S between the superconducting coil 10 and the pressure plate 28 via a valve 29. Is configured to do.

  According to the manufacturing apparatus 40 shown in FIG. 6, the superconducting conductor 11 is pressurized by the injected fluid S and can be constrained in the radial direction and the axial direction. The surface pressure between the superconducting conductors 11 can be more effectively increased while suppressing the displacement to the above, and the above-described operational effects can be exhibited more remarkably.

  Since the manufacturing apparatus 40 shown in FIG. 6 has the same configuration as the manufacturing apparatus 20 shown in FIG. 4 except that a pressurizing mechanism is added, the same effects as the manufacturing apparatus shown in FIG. 4 are achieved. become.

  The present invention has been described in detail based on the above specific examples. However, the present invention is not limited to the above specific examples, and various modifications and changes can be made without departing from the scope of the present invention.

It is a partially cutaway view showing a schematic configuration of a superconducting coil according to the first embodiment. It is one process figure of the manufacturing process for implement | achieving the winding of the superconducting conductor which comprises the superconducting coil shown in FIG. 1, and a lamination | stacking state. It is one process figure of the manufacturing process for implement | achieving the winding of the superconducting conductor which comprises the superconducting coil concerning 2nd Embodiment, and a lamination | stacking state. It is a schematic block diagram which shows an example of the manufacturing apparatus of a superconducting coil. It is a schematic block diagram which shows the other example of the manufacturing apparatus of a superconducting coil. It is a schematic block diagram which shows the other example of the manufacturing apparatus of a superconducting coil.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Superconducting coil 11 Superconducting conductor 12 1st prepreg insulating member 13 2nd prepreg insulating member 14 Insulating member 20, 30, 40 Superconducting coil manufacturing apparatus 21 Bottom plate 22 Side wall 23 Upper plate 25 Heating means 26 Pump 28 Pressure plate 29 Valve S fluid

Claims (12)

Covering the outer periphery of the superconducting conductor with a first prepreg insulating member and winding the superconducting conductor;
Coating at least one of the upper surface and the lower surface of the superconducting conductor covered with the first prepreg insulating member with a second prepreg insulating member;
The superconducting conductor, the first prepreg insulating member, and the second prepreg insulating member are subjected to heat treatment, and the resin in the first prepreg insulating member and the second prepreg insulating member is transferred to the superconducting conductor. A process of filling the gap,
A method of manufacturing a superconducting coil, wherein the rigidity of the second prepreg insulating member during heat treatment is smaller than the rigidity of the first prepreg insulating member. Covering the outer periphery of the superconducting conductor with the first prepreg insulating member and winding and arranging in the first direction;
Laminating the superconducting conductor coated with the first prepreg insulating member in a second direction perpendicular to the first direction with at least one or more layers separated by a second prepreg insulating member; and
The superconducting conductor, the first prepreg insulating member, and the second prepreg insulating member are subjected to heat treatment, and the resin in the first prepreg insulating member and the second prepreg insulating member is converted into the plurality of superconducting members. And filling the gap between the conductors,
A method of manufacturing a superconducting coil, wherein the rigidity of the second prepreg insulating member during heat treatment is smaller than the rigidity of the first prepreg insulating member.   The method of manufacturing a superconducting coil according to claim 2, wherein the second prepreg insulating member covers at least one of an uppermost layer and a lowermost layer of the plurality of superconducting conductors. Instead of covering the outer periphery of the superconducting conductor, the first prepreg insulating member is disposed between the superconducting conductors adjacent in the first direction,
The method for manufacturing a superconducting coil according to any one of claims 1 to 3, wherein a solid insulating member that covers the outer periphery of the superconducting conductor is provided.   The said solid insulation member contains a polyimide film, The manufacturing method of the superconducting coil as described in any one of Claims 1-4 characterized by the above-mentioned.   The superconductivity according to any one of claims 1 to 5, wherein a resin content of the second prepreg insulating member is higher than a resin content of the first prepreg insulating member before the heat treatment. Coil manufacturing method.   The resin content of the second prepreg insulating member is 50% by weight or more, and the resin content of the first prepreg insulating member is less than 50% by weight. A method for producing a superconducting coil according to claim 1.   The superconducting coil manufacturing method according to any one of claims 1 to 7, further comprising a step of reducing the pressure between the superconducting conductors during the heat treatment so as to make the pressure lower than the atmospheric pressure.   The superconducting coil according to any one of claims 1 to 8, further comprising a step of pressurizing the superconducting conductor in at least one of the first direction and the second direction during heat treatment. Production method. A superconducting coil manufacturing apparatus used in the method of manufacturing a superconducting coil according to any one of claims 1 to 9,
A frame that houses the superconducting conductor of the multilayer multi-row structure;
Heating means for heating the superconducting conductors of the multi-layered multi-row structure; and exhaust means for reducing the pressure inside the frame during the heat treatment and reducing the pressure between the superconducting conductors to lower than the atmospheric pressure;
A superconducting coil manufacturing apparatus comprising:   The superconducting coil manufacturing apparatus according to claim 10, further comprising means for pressurizing the superconducting conductor in the first direction during the heat treatment.   The superconducting coil manufacturing apparatus according to claim 10 or 11, further comprising means for pressurizing the superconducting conductor in the second direction during the heat treatment.

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