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

Abstract

To make it possible to stably energize a high-temperature superconducting coil even under a strong magnetic field.SOLUTION: A high-temperature superconducting coil device has a high-temperature superconducting coil 11 that includes a winding portion 16 composed of high-temperature superconducting wire wound around a winding frame, a lead electrode 12A that is electrically connected directly or indirectly to the high-temperature superconducting wire at one end part of at least one of an inner circumferential side and an outer circumferential side of the winding portion, and a reinforcing cover 13 that is arranged to sandwich the lead electrode from both sides between the winding portion and the reinforcing cover. The reinforcing cover is configured by being mechanically fixed on the lead electrode and directly or indirectly mechanically fixed to the winding portion.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] Embodiments of the present invention relate to a high-temperature superconducting coil device having a high-temperature superconducting coil formed by winding a high-temperature superconducting wire around a winding frame, and a stacked high-temperature superconducting coil device in which a plurality of high-temperature superconducting coils are stacked in the coil central axis direction.

Background Art

[0002] A high-temperature superconducting coil device having a high-temperature superconducting coil formed by winding a high-temperature superconducting wire around a winding frame, and a stacked high-temperature superconducting coil device in which a plurality of high-temperature superconducting coils are stacked in the coil central axis direction are subjected to electromagnetic forces by self-magnetic fields and external magnetic fields during energization. Due to such electromagnetic forces, so-called hoop stress, which is an electromagnetic stress in the direction of swelling in the coil diameter direction, and axial compressive stress are generated in the high-temperature superconducting coil, and the winding portion of the high-temperature superconducting coil tends to deform in the radial and axial directions.

[0003] On the other hand, an electromagnetic force of I×B×L, which is represented by the product of the current I, the magnetic field B, and the electrode length L, acts on the outlet electrode provided at the end of the winding portion of the high-temperature superconducting coil for inputting and outputting current from outside the coil. Furthermore, since the outlet electrode is responsible for electrical connection with the outside of the coil, an external force due to handling also acts during attachment and detachment, and thermal stress is generated due to thermal contraction during cooling from room temperature to the operating temperature.

[0004] In a state where the above-described electromagnetic force, external force, and thermal stress act, local stress is generated in the high-temperature superconducting wire located at the end of the winding portion directly or indirectly connected to the outlet electrode.

[0005] In recent years, rare-earth-based high-temperature superconducting wire materials such as RE1B2C3O7, which have been actively developed, enable current conduction at a higher current density than before in a high magnetic field. However, since the superconducting layer is a thin film of oxide, it is extremely vulnerable to peeling and cracking. Therefore, due to the above-mentioned local stress, the high-temperature superconducting wire material near the lead-out electrode has its superconducting characteristics degraded or lost, and it transitions from the superconducting state with zero electrical resistance to the normal-conducting state with finite resistance. As a result, local temperature rise occurs due to Joule heating, and in the worst case, thermal runaway occurs and the wire burns out, rendering the high-temperature superconducting coil unable to conduct electricity.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] For example, in Patent Document 1, an intermediate electrode called a conductive protrusion is electrically connected to the outer peripheral side end portion in the winding portion of a pancake coil, and this conductive protrusion is connected to the lead-out electrode. As a configuration in which the lead-out electrode is mechanically fixed to a flange adjacent to the coil side surface, a proposed configuration has been proposed.

[0008] However, although the lead-out electrode is fixed, when current flows through the conductive protrusion, it receives the above-mentioned electromagnetic force of I×B×L. In addition, an electromagnetic force that generates the above-mentioned hoop stress in the direction of swelling in the coil diameter direction and axial compressive stress acts on the winding portion. Due to this electromagnetic force, since the conductive protrusion is not supported, local stress is generated in the high-temperature superconducting wire material at the end portion of the winding portion electrically connected to this conductive protrusion.

[0009] In particular, when a high electromagnetic force is generated by a strong magnetic field, the above-mentioned local stress increases, and the high-temperature superconducting wire at the end of the winding part connected to the conductive protrusion due to this local stress has a high risk of deterioration of superconducting characteristics, locally increases in temperature due to Joule heating, and in the worst case, thermal runaway occurs and it burns out, and there is a risk that the high-temperature superconducting coil becomes inoperable.

[0010] Embodiments of the present invention have been made in consideration of the above circumstances, and an object thereof is to provide a high-temperature superconducting coil device and a laminated high-temperature superconducting coil device that can stably energize a high-temperature superconducting coil even under a strong magnetic field.

Means for Solving the Problems

[0011] The high-temperature superconducting coil device according to an embodiment of the present invention includes a winding part formed by winding a high-temperature superconducting wire around a winding frame the insulating bobbin provided on the inner peripheral side of this winding portion, and the inner peripheral electrode electrically connected to the high-temperature superconducting wire at the inner peripheral side end portion of the winding portion a high-temperature superconducting coil having, and the winding part on the outer peripheral side of at the end of the high-temperature superconducting wire in directly or at the inner peripheral side end portion of the winding portion, to the high-temperature superconducting wire through the inner peripheral electrode indirectly respectively electrically connected outlet electrodes, and a reinforcing cover arranged to sandwich the outlet electrodes from both sides between the winding part and the reinforcing cover, the reinforcing cover is mechanically fixed to the outlet electrodes, and to the winding part directly mechanically fixed to or indirectly mechanically fixed to the winding portion by being mechanically fixed to at least one of the bobbin and the inner peripheral electrode and is characterized in being configured.

[0012] The laminated high-temperature superconducting coil device according to an embodiment of the present invention includes a winding part formed by winding a high-temperature superconducting wire around a winding frame the insulating bobbin provided on the inner peripheral side of this winding portion, and the inner peripheral electrode electrically connected to the high-temperature superconducting wire at the inner peripheral side end portion of the winding portion a plurality of high-temperature superconducting coils laminated in the central axis direction of this winding part, and the winding parts of the high-temperature superconducting coils arranged at both ends in the lamination direction on the outer peripheral side of at the end of the high-temperature superconducting wire in directly or at the inner peripheral side end portion of the winding portion of the high-temperature superconducting coil arranged at both ends in the stacking direction, to the high-temperature superconducting wire through the inner peripheral electrode indirectly respectivelyIt has an outlet electrode electrically connected thereto and a reinforcing cover disposed so as to sandwich the outlet electrode from both sides between the winding portions of the high-temperature superconducting coil disposed at both ends in the stacking direction. The reinforcing cover is mechanically fixed to the outlet electrode and is also fixed to the winding portions of at least one of the stacked high-temperature superconducting coils. directly mechanically fixed to or indirectly mechanically fixed to the winding portion of at least one of the stacked high-temperature superconducting coils by being mechanically fixed to at least one of the bobbin and the inner peripheral electrode and is configured as such.

Advantages of the Invention

[0013] According to an embodiment of the present invention, it is possible to stably energize a high-temperature superconducting coil even under a strong magnetic field.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. [A] First Embodiment (FIGS. 1 to 5) FIG. 1 shows a high-temperature superconducting coil device according to the first embodiment, where (A) is an overall perspective view and (B) is a cross-sectional view of the high-temperature superconducting coil in FIG. 1(A). The high-temperature superconducting coil device 10 shown in this FIG. 1 includes a high-temperature superconducting coil 11 having a winding frame 15, a winding portion 16, and an inner peripheral electrode 17 (FIG. 4), a conductive lead-out electrode 12 (12A, 12B) for flowing current into and out of the high-temperature superconducting coil 11 from the outside, and reinforcing covers 13 and 14 for mechanically supporting the lead-out electrode 12.

[0016] The high-temperature superconducting coil 11 is formed by winding a high-temperature superconducting wire (high-temperature superconducting tape wire) 18 shown in FIG. 2 in a spiral around the winding frame 15 together with an insulating wire (insulating tape wire) 19 to form a so-called pancake-shaped winding portion 16. Since the winding portion 16 of this high-temperature superconducting coil 11 has a pancake shape, it is called a so-called pancake coil.

[0017] The winding frame 15 is provided on the inner peripheral side of the winding portion 16 and is composed of an insulating material such as glass fiber reinforced plastic or reinforced PTFE (polytetrafluoroethylene). Further, the inner peripheral electrode 17 (Fig. 4) is electrically connected to the high-temperature superconducting wire 18 at the inner peripheral side end of the winding portion 16 and the lead-out electrode 12B described later. Insulating layers 20 are fixed to both side surfaces 16A and 16B of the winding portion 16 in the coil central axis O direction of the above-described winding portion 16. When stacking a plurality of high-temperature superconducting coils 11, this insulating layer 20 insulates and protects the winding portion 16 from the winding portions 16 of other high-temperature superconducting coils 11.

[0018] Furthermore, the high-temperature superconducting coil 11 is integrally impregnated and cured with a resin such as epoxy (not shown). This impregnation and curing suppresses the mechanical movement of the high-temperature superconducting wire 18 during the use of the high-temperature superconducting coil 11 to maintain the coil strength, and also provides insulation protection between turns of the high-temperature superconducting wire 18, preventing a "quench" in which the superconducting state of the high-temperature superconducting coil 11 is broken.

[0019] Here, as shown in Fig. 2, the high-temperature superconducting wire 18 has at least a tape substrate 2, an intermediate layer 3, and a superconducting layer 4, and both sides thereof are covered with a stabilizing layer 5. Further, if necessary, an alignment layer 6 may be provided between the tape substrate 2 and the intermediate layer 3, and a protective layer 7 may be provided between the superconducting layer 4 and the stabilizing layer 5, respectively.

[0020] The tape substrate 2 is formed of a material such as a high-strength metal such as Hastelloy (registered trademark) or a Ni-based alloy containing NiW. The intermediate layer 3 is a diffusion prevention layer and is made of a material such as cerium oxide, YSZ, magnesium oxide, yttrium oxide, ytterbium oxide, barium zirconia, etc., and is formed on the tape substrate 2.

[0021] The superconducting layer 4 has, for example, a RE123-based composition (such as RE1B2C3O7) or Bi2Sr2Ca2Cu3O 10+xIt is composed of a thin film of an oxide superconductor having a bismuth-based composition such as a wire. In "RE1B2C3O7", "RE" means at least one of rare earth elements (for example, neodymium (Nd), gadolinium (Gd), holmium (Ho), samarium (Sm), etc.) and yttrium element, "B" means barium (Ba), "C" means copper (Cu), and "O" means oxygen (O). Further, the stabilizing layer 5 is provided for the purpose of preventing the superconducting layer 4 from burning when excessive electricity flows through the superconducting layer 4, and is formed of conductive silver or the like.

[0022] The alignment layer 6 is provided for the purpose of aligning the intermediate layer 3 on the tape substrate 2 and is formed of magnesium oxide (MgO) or the like. When an aligned tape substrate 2 is used, the alignment layer 6 can be omitted. Further, the protective layer 7 is provided for the purpose of preventing the superconducting layer 4 from deteriorating by coming into contact with moisture in the air, etc., and is formed of silver or the like. The protective layer 7 also functions to prevent the superconducting layer 4 from burning when excessive electricity flows through the superconducting layer 4.

[0023] The tape width w of such a high-temperature superconducting wire (high-temperature superconducting tape wire) 18 having a multilayer structure is, for example, 4 to 12 mm, and the tape thickness t is 0.1 to 0.2 mm. Further, the high-temperature superconducting wire (high-temperature superconducting tape wire) 18 has the characteristic of being excellent in mechanical strength in the longitudinal direction while being fragile in the tensile stress (peeling stress) in the direction perpendicular to the tape surface. Further, it may be a high-temperature superconducting wire with an insulating coating in which the periphery of the high-temperature superconducting wire 18 is coated with an insulating material such as polyimide or polyimide amide.

[0024] The lead-out electrode 12 is electrically connected directly or indirectly to the high-temperature superconducting wire 18 at at least one end of the outer peripheral side and the inner peripheral side of the winding portion 16 of the superconducting coil 11. In the present embodiment, as shown in FIGS. 1 and 3, the lead-out electrode 12A is electrically connected directly to the high-temperature superconducting wire 18 at the end of the outer peripheral side of the winding portion 16. Further, as shown in FIGS. 1 and 4, the lead-out electrode 12B is electrically connected indirectly to the high-temperature superconducting wire 18 at the end of the inner peripheral side of the winding portion 16 via the inner peripheral electrode 17. Currents flow in and out from the outside using these lead-out electrodes 12A and 12B.

[0025] As shown in FIGS. 1 and 3, the reinforcing cover 13 is formed in a U-shape in plan view and is arranged so as to sandwich the lead-out electrode 12A from both sides between it and the winding portion 16. This reinforcing cover 13 is mechanically fixed to the lead-out electrode 12A using an adhesive and is also mechanically fixed directly to the winding portion 16 using an adhesive. Thereby, the winding portion 16, the lead-out electrode 12A, and the reinforcing cover 13 are integrally connected, and the lead-out electrode 12A is mechanically supported in a state of being pressed from the outer peripheral side of the winding portion 16 by the reinforcing cover 13.

[0026] As shown in FIGS. 1 and 4, the reinforcing cover 14 is formed in a U-shape in plan view and is arranged so as to sandwich the lead-out electrode 12B from both sides between it and the winding portion 16. This reinforcing cover 14 is mechanically fixed to the lead-out electrode 12B using an adhesive and is fixed to the inner peripheral electrode 17 using an adhesive, thereby being mechanically fixed to the winding portion 16 indirectly. Thereby, the winding portion 16, the lead-out electrode 12B, and the reinforcing cover 14 are integrally connected, and the lead-out electrode 12B is mechanically supported in a state of being pressed from the inner peripheral side of the winding portion 16 by the reinforcing cover 14.

[0027] Note that, as shown in FIG. 5, the reinforcing cover 14A as a deformed form of the reinforcing cover 14 is mechanically fixed to the winding frame 15 and the inner peripheral electrode 17 using an adhesive material. Thereby, the lead-out electrode 12B is mechanically supported more firmly on the inner peripheral side of the winding portion 16.

[0028] Here, as the material of the reinforcing covers 13, 14, and 14A, insulating materials such as glass fiber reinforced plastic (GFRP), carbon fiber reinforced plastic (CRFP), aramid fiber reinforced plastic (AFRP), reinforced PTFE (polytetrafluoroethylene), and polycarbonate are suitable. Since the reinforcing covers 13, 14, and 14A are made of the above-described insulating materials, they are not affected by electromagnetic force.

[0029] Also, the thickness of the reinforcing covers 13, 14, and 14A can increase the mechanical support strength as it gets thicker. However, in this case, the thermal stress due to the thermal shrinkage of the reinforcing covers 13, 14, and 14A increases. On the other hand, it is also possible to make the reinforcing covers 13, 14, and 14A thin in a sheet shape. In this case, although the mechanical support strength decreases, it becomes possible to suppress the thermal stress due to the thermal shrinkage of the reinforcing covers 13, 14, and 14A.

[0030] Due to being configured as described above, according to the first embodiment, the following effect (1) is achieved. (1) The outgoing electrode 12A is mechanically supported by being sandwiched from both sides between the winding portion 16 of the high-temperature superconducting coil 11 and the reinforcing cover 13. Also, the reinforcing cover 13 is mechanically fixed to the outgoing electrode 12A and directly mechanically fixed to the winding portion 16. Further, the outgoing electrode 12B is mechanically supported by being sandwiched from both sides between the winding portion 16 of the high-temperature superconducting coil 11 and the reinforcing covers 14 and 14A. Also, the reinforcing covers 14 and 14A are mechanically fixed to the outgoing electrode 12B and indirectly mechanically fixed to the winding portion 16 via at least one of the inner peripheral electrode 17 and the winding frame 15.

[0031] Therefore, even when a high electromagnetic force is generated by a strong magnetic field, in the high-temperature superconducting wire 18 at the end of the winding portion 16 that is directly or indirectly electrically connected to the outgoing electrodes 12A and 12B, it is possible to prevent a decrease in superconducting characteristics due to local stress. As a result, it is possible to stably energize the high-temperature superconducting coil 11 even under a strong magnetic field.

[0032] [B] Second Embodiment (Fig. 6) FIG. 6 is a cross-sectional view showing the periphery of the reinforcement cover in the high-temperature superconducting coil device according to the second embodiment. For the parts similar to those in the first embodiment in this second embodiment, the same reference numerals as those in the first embodiment are given to simplify or omit the description.

[0033] The difference between the high-temperature superconducting coil device 25 of this second embodiment and the first embodiment is that the insulating reinforcement cover 26 is composed of a composite of a first cover element 27 made of a metal material and a second cover element 28 made of an insulating material that covers the surfaces of the lead-out electrode 12B and the winding frame 15 and the inner peripheral electrode 17 of the high-temperature superconducting coil 11 on the surface of the first cover element 27.

[0034] As the material of the first cover element 27, for example, non-magnetic metal materials such as copper, copper alloy, and stainless steel are suitable. By using a non-magnetic metal material that does not receive electromagnetic force as the first cover element 27 in this way, the mechanical strength of the reinforcement cover 26 is improved compared to the first embodiment. Also, as the material of the second cover element 28, insulating materials such as polyimide, epoxy resin, and glass fiber reinforced plastic are suitable. The second cover element 28 ensures insulation between the reinforcement cover 26 and the lead-out electrode 12B.

[0035] Due to being configured as described above, according to this second embodiment, the following effect (2) is achieved. (2) The reinforcement cover 26 can improve the mechanical support strength compared to the first embodiment by the first cover element 27 while ensuring insulation from the lead-out electrode 12B by the second cover element 28. For this reason, in the high-temperature superconducting wire 18 at the end of the winding portion 16 connected to the inner peripheral electrode 17, it is possible to more reliably prevent the degradation of the superconducting characteristics due to local stress than in the first embodiment, and it is possible to stably energize the high-temperature superconducting coil 11 even under a strong magnetic field.

[0036] [C] Third Embodiment (FIG. 7) FIG. 7 is a cross-sectional view showing the periphery of a reinforcing cover in the high-temperature superconducting coil device according to the third embodiment. Regarding the parts similar to those in the first embodiment in this third embodiment, the description will be simplified or omitted by assigning the same reference numerals as those in the first embodiment.

[0037] The difference between the high-temperature superconducting coil device 30 of this third embodiment and the first embodiment is that the insulating reinforcing cover 31 is formed in a flat plate shape in plan view, and at least one of the winding frame 15 and the inner peripheral electrode 17 of the superconducting coil 11 (the winding frame 15 in FIG. 7) is mechanically fixed by at least one of an adhesive and a bolt 32 (an adhesive and a bolt 32 in FIG. 7). Instead of the bolt 32, other fastening means such as screws, rivets, and pins may be used.

[0038] Due to being configured as described above, according to this third embodiment, the following effect (3) is achieved. (3) Since the reinforcing cover 31 is mechanically coupled to the winding frame 15 by fastening the bolt 32, compared with the first and second embodiments, the mechanical support strength for the lead-out electrode 12B can be further improved. Therefore, in the high-temperature superconducting wire 18 at the inner peripheral side end of the winding portion 16 electrically connected to the lead-out electrode 12B via the inner peripheral electrode 17, it is possible to more reliably prevent the deterioration of the superconducting characteristics due to local stress than in the case of the first and second embodiments. As a result, it is possible to stably energize the high-temperature superconducting coil 11 even under a strong magnetic field.

[0039] [D] Fourth Embodiment (FIGS. 8 to 9) FIG. 8 is a partial cross-sectional view including a reinforcing cover in the laminated high-temperature superconducting coil device according to the fourth embodiment. Regarding the parts similar to those in the first embodiment in this fourth embodiment, the description will be simplified or omitted by assigning the same reference numerals as those in the first embodiment.

[0040] This fourth embodiment relates to a stacked high-temperature superconducting coil device 40 in which a plurality of high-temperature superconducting coils 11 are stacked in the coil central axis O direction of the winding portion 16. In this stacked high-temperature superconducting coil device 40, the outlet electrode 12B is directly or indirectly (indirectly through the inner peripheral electrode 17 in FIG. 8) electrically connected to the high-temperature superconducting wire 18 at at least one of the outer peripheral side or the inner peripheral side (the inner peripheral side in FIG. 8) of the end portion of the winding portion 16 of the high-temperature superconducting coil 11 disposed at both ends in the stacking direction (the upper end in FIG. 8).

[0041] As shown in FIGS. 8 and 9, the insulating reinforcing cover 41 that mechanically supports the outlet electrode 12B is disposed so as to sandwich the outlet electrode 12B from both sides between the winding portion 16 of the high-temperature superconducting coil 11 disposed at both ends in the stacking direction (the upper end in FIGS. 8 and 9). And this reinforcing cover 41 is fixed to the outlet electrode 12B using an adhesive. Further, the reinforcing cover 41 is mechanically connected directly or indirectly (indirectly through the inner peripheral electrode 17 in FIGS. 8 and 9) to the winding portion 16 of at least one stacked high-temperature superconducting coil 11 (the high-temperature superconducting coil 11 to which the outlet electrode 12B is electrically connected and the high-temperature superconducting coil 11M adjacent to this high-temperature superconducting coil 11 in FIGS. 8 and 9).

[0042] Due to being configured as described above, according to this fourth embodiment, the following effect (4) is achieved. (4) The reinforcing cover 41 is not only mechanically fixed to the winding portion 16 of the high-temperature superconducting coil 11 to which the outlet electrode 12B is electrically connected through the inner peripheral electrode 17, but also mechanically fixed to the winding portion 16 of the high-temperature superconducting coil 11M adjacent to the high-temperature superconducting coil 11 through the inner peripheral electrode 17. For this reason, the mechanical support strength of the outlet electrode 12B by the reinforcing cover 41 can be improved as compared with the cases of the first to third embodiments. Therefore, in the high-temperature superconducting wire 18 at the inner peripheral side end portion of the winding portion 16 of the high-temperature superconducting coil 11 electrically connected to the outlet electrode 12B through the inner peripheral electrode 17, it is possible to more reliably prevent the degradation of the superconducting characteristics due to local stress as compared with the cases of the first to third embodiments. As a result, it is possible to stably energize the high-temperature superconducting coil 11 even under a strong magnetic field.

[0043] [E]Fifth Embodiment (FIG. 10) FIG. 10 is a partial cross-sectional view including a reinforcing cover in a stacked high-temperature superconducting coil device according to the fifth embodiment, and (B) is a cross-sectional view taken along the line X-X of FIG. 10(A). For parts similar to those in the first embodiment in this fifth embodiment, the description is simplified or omitted by assigning the same reference numerals as those in the first embodiment.

[0044] In the stacked high-temperature superconducting coil device 50 of this fifth embodiment, the lead-out electrode 12B is electrically connected directly or indirectly (indirectly via the inner peripheral electrode 17 in FIG. 10) to the high-temperature superconducting wire 18 at least at one of the outer peripheral side or the inner peripheral side (the inner peripheral side in FIG. 10) of the end portion of the winding portion 16 of the high-temperature superconducting coil 11 disposed at both ends in the stacking direction (the lower end in FIG. 10).

[0045] Further, the insulating reinforcing cover 51 that mechanically supports the lead-out electrode 12B is disposed so as to sandwich the lead-out electrode 12B from both sides between itself and the winding portion 16 of the high-temperature superconducting coil 11 disposed at both ends in the stacking direction (the lower end in FIG. 10). And this reinforcing cover 51 is fixed to the lead-out electrode 12B using an adhesive.

[0046] Furthermore, the reinforcing cover 51 is mechanically fixed directly or indirectly to the winding portion 16 of at least one stacked high-temperature superconducting coil. That is, the reinforcing cover 51 is mechanically fixed to the winding portion 16 of the high-temperature superconducting coil 11 to which the lead-out electrode 12B is electrically connected via the inner peripheral electrode 17 using an adhesive. Also, the reinforcing cover 51 is mechanically fixed to the winding portion 16 of the high-temperature superconducting coil 11N adjacent to the high-temperature superconducting coil 11 via the winding frame 15 and the inner peripheral electrode 17 using an adhesive and fastening means (for example, bolts 52). The above-mentioned bolts 52 couple the reinforcing cover 51 to the winding frame 15 of the high-temperature superconducting coil 11N.

[0047] Note that the reinforcing cover 51 may be configured such that the first cover piece 51A to which the bolt 52 is screwed and the second cover piece 51B adhered to the inner peripheral electrode 17 are separate bodies and adhered and integrated during installation, or may be configured as an integral structure from the beginning.

[0048] Due to being configured as described above, according to this fifth embodiment, the following effect (5) is achieved. (5) The reinforcing cover 51 is not only mechanically fixed to the winding portion 16 of the high-temperature superconducting coil 11 electrically connected to the outgoing electrode 12B via the inner peripheral electrode 17 using an adhesive, but also to the winding portion 16 of the high-temperature superconducting coil 11N adjacent to the high-temperature superconducting coil 11 via the inner peripheral electrode 17 using an adhesive and mechanically fixed using an adhesive and the bolt 52 via the winding frame 15.

[0049] Therefore, the mechanical support strength of the outgoing electrode 12B by the reinforcing cover 41 can be improved compared to the cases of the first to fourth embodiments. Accordingly, in the high-temperature superconducting wire 18 at the inner peripheral side end of the winding portion 16 of the high-temperature superconducting coil 11 electrically connected to the outgoing electrode 12B via the inner peripheral electrode 17, a decrease in superconducting characteristics due to local stress can be more reliably prevented compared to the cases of the first to fourth embodiments. As a result, the high-temperature superconducting coil 11 can be stably energized even under a strong magnetic field.

[0050] [F] Sixth Embodiment (FIG. 11) FIG. 11 is a partial cross-sectional view including a reinforcing cover in a laminated high-temperature superconducting coil device according to the sixth embodiment. Regarding the parts similar to those in the first and fifth embodiments in this sixth embodiment, the description is simplified or omitted by assigning the same reference numerals as those in the first and fifth embodiments.

[0051] The difference between the stacked high-temperature superconducting coil device 60 of the sixth embodiment and the fifth embodiment is that a flange 62 is provided adjacent to the winding portion 16 of the high-temperature superconducting coil 11 disposed at one or both ends (the lower end in FIG. 11) in the stacking direction, and a reinforcing cover 61 that mechanically supports the outlet electrode 12B is mechanically fixed to the outlet electrode 12B, the inner peripheral electrode 17, the winding frame 15, and the flange 62 using fastening means such as bolts 63.

[0052] With the above configuration, according to the sixth embodiment, the following effect (6) is achieved. (6) Since the reinforcing cover 61 is mechanically fixed not only to the outlet electrode 12B, the inner peripheral electrode 17, and the winding frame 15 but also to the flange 62, the mechanical support strength for the outlet electrode 12B can be further improved compared to the first to fifth embodiments. Therefore, in the high-temperature superconducting wire 18 at the inner peripheral side end of the winding portion 16 of the high-temperature superconducting coil 11 electrically connected to the outlet electrode 12B via the inner peripheral electrode 17, it is possible to more reliably prevent the degradation of the superconducting characteristics due to local stress than in the case of the first to fifth embodiments. As a result, it is possible to stably energize the high-temperature superconducting coil 11 even under a strong magnetic field.

[0053] Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the gist of the invention. Also, those replacements, changes, and combinations are included in the scope and gist of the invention, and are included in the invention described in the claims and its equivalent scope.

[0054] For example, in each of the above-described embodiments, the case where the high-temperature superconducting coil 11 is a circular single-pancake coil has been described. However, it is not limited to a circular shape, and a non-circular high-temperature superconducting coil such as a saddle shape, an elliptical shape, or a three-dimensional shape may be used. Further, the high-temperature superconducting coil 11 of each embodiment may be a so-called double-pancake coil in which the high-temperature superconducting wire materials of the high-temperature superconducting coils adjacent to each other are continuously connected in the coil axis direction at the innermost circumference of the two-layered high-temperature superconducting coil.

Explanation of Reference Numerals

[0055] 10… High-temperature superconducting coil device, 11… High-temperature superconducting coil, 12, 12A, 12B… Outlet electrode, 13, 14, 14A… Reinforcing cover, 15… Winding frame, 16… Winding part, 17… Inner peripheral electrode, 18… High-temperature superconducting wire material, 25… High-temperature superconducting coil device, 26… Reinforcing cover, 27… First cover element, 28… Second cover element, 30… High-temperature superconducting coil device, 31… Reinforcing cover, 32… Bolt, 40… Stacked high-temperature superconducting coil device, 41… Reinforcing cover, 50… Stacked high-temperature superconducting coil device, 51… Reinforcing cover, 60… Stacked high-temperature superconducting coil device, 61… Reinforcing cover, 62… Flange, O… Coil central axis

Claims

1. A high-temperature superconducting coil comprising a winding portion in which a high-temperature superconducting wire is wound around a winding frame, the insulating winding frame provided on the inner peripheral side of the winding portion, and an inner peripheral electrode electrically connected to the high-temperature superconducting wire at the inner peripheral side end portion of the winding portion, a lead-out electrode electrically connected directly to the high-temperature superconducting wire at the outer peripheral side end portion of the winding portion or indirectly through the inner peripheral electrode to the high-temperature superconducting wire at the inner peripheral side end portion of the winding portion, and a reinforcing cover arranged to sandwich the lead-out electrode from both sides between the winding portion, wherein the reinforcing cover is mechanically fixed to the lead-out electrode and is mechanically fixed directly to the winding portion or indirectly to the winding portion by being mechanically fixed to at least one of the winding frame and the inner peripheral electrode. A high-temperature superconducting coil device characterized by this configuration.

2. The high-temperature superconducting coil device according to claim 1, wherein the reinforcing cover is composed of a first cover element made of a metal material and a second cover element made of an insulating material covering the surfaces of the first cover element facing the lead-out electrode and the high-temperature superconducting coil, which are combined.

3. The high-temperature superconducting coil device according to claim 1 or 2, wherein the reinforcing cover is mechanically fixed to the high-temperature superconducting coil by at least one of an adhesive and fastening means.

4. A plurality of high-temperature superconducting coils laminated in the central axis direction of the winding portion, comprising a winding portion in which a high-temperature superconducting wire is wound around a winding frame, the insulating winding frame provided on the inner peripheral side of the winding portion, and an inner peripheral electrode electrically connected to the high-temperature superconducting wire at the inner peripheral side end portion of the winding portion, a lead-out electrode electrically connected directly to the high-temperature superconducting wire at the outer peripheral side end portion of the winding portion of the high-temperature superconducting coils arranged at both ends in the lamination direction or indirectly through the inner peripheral electrode to the high-temperature superconducting wire at the inner peripheral side end portion of the winding portion of the high-temperature superconducting coils arranged at both ends in the lamination direction, and a reinforcing cover arranged to sandwich the lead-out electrode from both sides between the winding portions of the high-temperature superconducting coils arranged at both ends in the lamination direction. The reinforcing cover is mechanically fixed to the outlet electrode, directly mechanically fixed to the winding portion of at least one of the stacked high-temperature superconducting coils, or indirectly mechanically fixed to the winding portion of at least one of the stacked high-temperature superconducting coils by being mechanically fixed to at least one of the winding frame and the inner peripheral electrode, and the stacked high-temperature superconducting coil device is configured as such.

5. The laminated high-temperature superconducting coil device according to claim 4, wherein a flange is provided adjacent to the winding portion of the high-temperature superconducting coil disposed at one or both ends in the stacking direction, and a reinforcing cover is mechanically fixed to the flange.

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