A superconducting tape and coil former tight form modular racetrack coil

Abstract

The application discloses a superconducting tape and coil skeleton close type modular runway-shaped coil and belongs to the technical field of power generation, power transformation or power distribution. The modular runway-shaped coil comprises a coil support, at least one electrode terminal and at least one layer of tape coil; the coil support comprises a coil skeleton, at least one layer of tape coil is wound on the coil skeleton, and the current lead-out wire of each layer of tape coil is welded on an electrode terminal and then led out; the coil skeleton is configured in a rectangular round corner and arc line profile on the outside, which is composed of four circular arc segments and four connecting segments, at least one connecting segment is an arc segment, the circles where the two circular arc segments adjacent to the arc segment are located are inscribed in the arc line where the arc segment is located, the tape coil is closely combined with the coil skeleton, and the compactness of the coil structure is improved.

Description

TECHNICAL FIELD

[0001] The application discloses a superconducting tape and coil skeleton close type modular racetrack-shaped coil, relates to electrical and mechanical transmission equipment, and belongs to the technical field of power generation, power transformation or power distribution. BACKGROUND

[0002] With the continuous development of superconducting materials and low-temperature application technology, superconducting coils are widely applied in nuclear magnetic equipment, magnetic confinement fusion devices, accelerators and electrical equipment. According to different application occasions, the superconducting coils are designed and manufactured into shapes such as a circular pie, a D shape, a spiral shape, a saddle shape and a racetrack shape. Since the racetrack-shaped coil has long and short straight line segments and arc line segments, the winding of the superconducting tape is difficult, and in particular, the superconducting tape in the long straight line segment is difficult to closely adhere to the coil skeleton, so that the racetrack-shaped coil is prone to turn-to-turn displacement and friction in a complex electromagnetic environment, and thus the risk of quench of the superconducting coil is increased.

[0003] Chinese patent CN108809052A discloses a superconducting motor adopting a racetrack-shaped superconducting sheet stacked coil. The prepared racetrack-shaped coil is fixed on a boss of a magnetic yoke, and the gap between the racetrack-shaped coil and the boss is filled with epoxy resin. Although a racetrack-shaped superconducting coil structure is drawn in the accompanying drawings, in fact, it is only an ideal coil diagram without considering the mechanical properties of the superconducting tape. In fact, due to the existence of mechanical stress of the superconducting tape, the long straight line segment of the coil will definitely protrude, resulting in an inevitable gap between the racetrack-shaped coil and the boss of the magnetic yoke, and thus the epoxy resin has to be used for filling. This not only increases the process and cost, but also causes additional mechanical stress due to different low-temperature shrinkage rates of materials, threatening the safe and reliable operation of the superconducting coil. Chinese patent CN106535079A discloses a forming method and forming device of a racetrack-shaped coil. The elliptical coil is sleeved on a pair of fixed support columns, and a pair of extrusion tools extrude the coil from the outside of the coil to the inside at the same time, so that the forming quality of the racetrack-shaped coil can be improved. Obviously, the patent is not applicable to high-temperature superconducting tapes which are sensitive to mechanical tension or pressure, and it is also difficult to guarantee the close adhesion of the racetrack-shaped coil to the coil skeleton. Meanwhile, since the superconducting tape is wound on the coil skeleton, the coil skeleton with a reasonable structure is beneficial to cooling, and is the key to guarantee the reliable operation and efficient cooling of the modular racetrack-shaped coil. However, the currently disclosed coil skeletons for racetrack-shaped coils mainly have a single rectangular round corner shape, which is very unfavorable for the winding of the superconducting tape.

[0004] The application aims to provide a superconducting tape and coil skeleton close type modular racetrack-shaped coil to overcome the deficiencies of the prior art, and has important theoretical significance and application value for improving the close adhesion of the superconducting tape to the coil skeleton and enhancing the overall mechanical strength of the modular racetrack-shaped coil. SUMMARY

[0005] The application aims to solve the technical problems of the traditional racetrack-shaped coil and the difficulty in close contact with the framework, the large amount of wire used at the end, and the low compactness of the coil structure, and to achieve the purpose of close contact between the superconducting tape and the framework.

[0006] To achieve the above-mentioned application purposes, the application adopts the following technical solutions:

[0007] A superconducting tape and coil framework close type modular racetrack-shaped coil, comprising: a coil support, at least one electrode terminal, and at least one layer of tape coil; the coil support comprises a coil framework, and at least one layer of tape coil is wound on the coil framework; each layer of tape coil is welded on an electrode terminal; the coil framework is configured in a rectangular round corner and arc line profile on the outside, consisting of four circular arc segments and four connecting segments; at least one connecting segment is an arc segment, and the circles where the two circular arc segments adjacent to the arc segment are located are inscribed in the arc where the arc segment is located.

[0008] As a further optimization scheme of the superconducting tape and coil framework close type modular racetrack-shaped coil, the ratio of the arch height to the chord length of the arc line where the arc segment is located is 1 / 100~1 / 50.

[0009] As a further optimization scheme of the superconducting tape and coil framework close type modular racetrack-shaped coil, the coil support further comprises: an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are respectively located on the upper side and the lower side of the coil framework, and the upper cover plate and the lower cover plate are both provided with cover plate bolt holes and plate holes.

[0010] As a further optimization scheme of the superconducting tape and coil framework close type modular racetrack-shaped coil, the coil framework is provided with coil framework bolt holes.

[0011] As a further optimization scheme of the superconducting tape and coil framework close type modular racetrack-shaped coil, the upper cover plate and the lower cover plate are further provided with at least one pair of electrode bolt holes, each pair of electrode bolt holes comprises two electrode bolt holes, and an electrode limiting groove is provided between the two electrode bolt holes.

[0012] As a further optimization scheme of the superconducting tape and coil framework close type modular racetrack-shaped coil, the upper side of the electrode terminal is provided with a fastening bolt hole and an electrode limiting edge, the front side of the electrode terminal is provided with a current lead fixing bolt hole, and the electrode limiting edge is located between the adjacent two fastening bolt holes; when the electrode terminal is placed in the space area between the upper cover plate and the lower cover plate, the electrode limiting edge is engaged with the electrode limiting groove.

[0013] As a further optimization scheme of the superconducting tape and the coil skeleton close type modular racetrack coil, the coil support member further comprises at least one intermediate partition plate arranged outside the coil skeleton, and each intermediate partition plate is used for spacing the adjacent two layers of tape coils.

[0014] As a further optimization scheme of the superconducting tape and the coil skeleton close type modular racetrack coil, the intermediate partition plate is a hollow rectangular structure, and the hollow rectangular structure is provided with an intermediate partition plate middle section opening and an intermediate partition plate front section opening.

[0015] As a further optimization scheme of the superconducting tape and the coil skeleton close type modular racetrack coil, after at least one layer of tape coils is wound on the coil skeleton, the components in the coil support member are fastened through the fastening assembly.

[0016] As a further optimization scheme of the superconducting tape and the coil skeleton close type modular racetrack coil, each layer of tape coils is welded on the front side of an electrode terminal, the current lead is led out from the current lead fixing bolt hole, and the electrode terminal is fastened and connected with the coil support member through the fastening member.

[0017] The technical scheme of the present application has the following beneficial effects:

[0018] (1) The modular racetrack coil has the following beneficial effects: the straight line section of the coil skeleton is designed in an arc shape to obtain a skeleton structure with a rectangular round corner and an arc line profile on the outside, and the skeleton structure has the structural characteristics of a short end portion and a circular arc in the middle portion, thereby saving the amount of end portion tape, realizing close fitting of the tape coil and the coil skeleton, improving the compactness of the coil structure, and reducing the risk of quenching of the superconducting coil in a complex electromagnetic environment.

[0019] (2) The modular racetrack coil has the following beneficial effects: the straight line section of the coil skeleton is designed in an arc shape to obtain a skeleton structure with a rectangular round corner and an arc line profile on the outside, and the skeleton structure has the structural characteristics of a short end portion and a circular arc in the middle portion, thereby saving the amount of end portion tape, realizing close fitting of the tape coil and the coil skeleton, improving the compactness of the coil structure, and reducing the risk of quenching of the superconducting coil in a complex electromagnetic environment.

[0020] (3) The modular racetrack coil has the following beneficial effects: the upper and lower cover plates of the coil support member are designed to have electrode bolt holes and limiting grooves for mounting and fixing electrode terminals, thereby reducing the local displacement of the tape coil caused by the fastening of the electrode bolt and realizing reliable leading out of the current lead of the tape coil. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The present application is a three-dimensional view of the superconducting tape and the coil skeleton close type modular racetrack coil.

[0022] Figure 2Exploded view of the superconducting tape and coil former close type modular racetrack coil of the present invention.

[0023] Figure 3 Schematic view of the upper cover plate of the superconducting tape and coil former close type modular racetrack coil of the present invention.

[0024] Figure 4 Schematic view of the upper cover plate from above.

[0025] Figure 5 Schematic view of the electrode limiting slot of the upper cover plate.

[0026] Figure 6 Schematic view of the coil former of the superconducting tape and coil former close type modular racetrack coil of the present invention.

[0027] Figure 7 Schematic view of the coil former from above.

[0028] Figure 8 Schematic view of the tape coil after winding on the coil former.

[0029] Figure 9 Schematic view of the middle separation plate of the superconducting tape and coil former close type modular racetrack coil of the present invention.

[0030] Figure 10 Schematic view of the electrode terminal of the superconducting tape and coil former close type modular racetrack coil of the present invention.

[0031] Explanation of reference numerals in the attached drawings: 1. Upper cover plate; 2. Intermediate partition plate; 3. Lower cover plate; 4. Upper strip coil; 5. Lower strip coil; 6. First electrode terminal; 7. Second electrode terminal; 8. Fastener; 9. Coil frame; 101. Plate hole; 102. Cover plate bolt hole; 103. Electrode bolt hole; 104. Electrical limit groove; 201. Front opening of the intermediate partition plate; 202. Middle opening of the intermediate partition plate; 601. Current lead fixing bolt hole; 602. Fastening bolt hole; 603. Electrical limit edge; 8010. First fastening bolt; 8020. Second fastening bolt; 8030. Third fastening bolt; 8040. Fourth fastening bolt; 8050. Fifth fastening bolt; 8060. Sixth fastening bolt. Fastening bolts, 8070, seventh fastening bolt, 8080, eighth fastening bolt, 8090, ninth fastening bolt, 80100, tenth fastening bolt, 8011, first fastening nut, 8021, second fastening nut, 8031, third fastening nut, 8041, fourth fastening nut, 8051, fifth fastening nut, 8061, sixth fastening nut, 8071, seventh fastening nut, 8081, eighth fastening nut, 8091, ninth fastening nut, 80110, tenth fastening nut, 901, coil frame bolt hole, 902, coil frame arc segment, 9031, first arc segment, 9032, second arc segment, 9033, third arc segment, 9034, fourth arc segment. Detailed Implementation

[0032] The technical solution of the invention will now be described in detail with reference to the accompanying drawings.

[0033] Without loss of generality, and to facilitate the explanation of the invention, the following steps are taken: Figure 1 The diagram shows an xyz rectangular coordinate system, where -y direction is the front, y direction is the back, x direction is the right, -x direction is the left, z direction is the top, and -z direction is the bottom.

[0034] Figure 1 and Figure 2 The images show a three-dimensional view and an exploded view of the modular racetrack-shaped coil with the superconducting tape and coil skeleton tightly attached, as described in this invention. The modular racetrack-shaped coil includes: an upper cover plate 1, a middle partition plate 2, a lower cover plate 3, an upper tape coil 4, a lower tape coil 5, a first electrode terminal 6, a second electrode terminal 7, a fastener 8, and a coil skeleton 9. The fastener 8 serves to secure the various components and thus improve the overall integrity of the modular racetrack-shaped coil. The upper cover plate 1, the middle partition plate 2, the lower cover plate 3, and the coil skeleton 9 constitute the coil support for winding the superconducting tape.

[0035] The coil support can be made of one or more of 6061 aluminum alloy, epoxy glass fiber, copper, stainless steel and other non-magnetic, high mechanical strength materials, preferably the same material to avoid local stress concentration and cracking due to different low temperature shrinkage rates of the materials. The coil skeleton 9 is located at the center of the coil support, the upper cover plate 1 and the lower cover plate 3 are located on the upper side and the lower side of the coil skeleton 9 respectively, and the middle partition plate 2 is sleeved on the outer side of the coil skeleton 9. After the upper layer of tape coil 4 and the lower layer of tape coil 5 are wound on the coil skeleton 9, the middle partition plate 2 plays a role in spacing the upper layer of tape coil 4 and the lower layer of tape coil 5.

[0036] The upper cover plate and the lower cover plate in the superconducting tape and coil skeleton close type modular racetrack coil of the application are generally the same in shape and structure, so as to facilitate batch processing and manufacturing. The upper cover plate or the lower cover plate as a whole has a thin plate structure and a racetrack shape, and has a certain thickness, which is generally greater than 1 mm to ensure mechanical strength. Hereinafter, the structure of the upper cover plate and the lower cover plate of the application will be exemplarily described by taking the upper cover plate as an example. Figure 3 As shown, the upper cover plate 1 is provided with a plate hole 101, a cover plate bolt hole 102 and an electrode bolt hole 103. The main function of the plate hole 101 is to reduce the weight of the upper cover plate itself and improve the contact area of the superconducting tape and the coolant. When designing the weight reduction, the shape and position of the hole need to be considered to avoid the peripheral area and the corner area of the fastener as much as possible. Under the premise of ensuring mechanical strength, the cover plate bolt hole 102 and the electrode bolt hole 103 are generally designed as counterbores to reduce the thickness and volume of the entire modular racetrack coil and improve the surface flatness of the entire modular racetrack coil.

[0037] Figure 4 And Figure 5 The upper cover plate is shown in the schematic view and the partial schematic view. The electrode limiting groove 104 is preferably designed between the adjacent electrode bolt holes 103. In this embodiment, the electrode limiting groove on the upper cover plate 1 is formed by opening a groove body with a height of 0.5 mm, a width of 0.5 mm and a length of 30 mm. The size of the groove body needs to be determined in combination with the size of the electrode terminal and the thickness and mechanical strength of the upper and lower cover plates.

[0038] Figure 6 And Figure 7This is a schematic diagram of the coil skeleton in the modular racetrack-shaped coil where the superconducting tape and coil skeleton are closely attached, according to the present invention. The inner side of the coil skeleton 9 presents a rectangular rounded corner outline, namely four arc segments and four straight line segments; the outer side of the coil skeleton 9 presents a rectangular rounded corner and arc outline, namely four arc segments, two straight line segments, and two arc segments. The two straight line segments are located on the short side, and the two arc segments are located on the long side, that is, there are two coil skeleton arc segments 902. The arc of the arc segment can be a circular arc or an elliptical arc, but it must be ensured that the circles of the two adjacent arc segments are inscribed in the arc. That is, the circles of the first arc segment 9031 and the third arc segment 9033 are inscribed in the arc of one line segment skeleton arc segment 902, and the circles of the second arc segment 9032 and the fourth arc segment 9034 are inscribed in the arc of another line segment skeleton arc segment 902, so as to ensure the continuity of the arc. The coil frame 9 has 6 coil frame bolt holes 901, which are generally through holes or threaded holes.

[0039] This embodiment also provides an optimized design scheme for the arc segment of the coil frame, such as... Figure 7 As shown, the arc at the location of the line segment skeleton arc segment 902 is defined as C2, with its center at o2 and radius at R2; the arc at the rounded corner of the rectangle is defined as C1, with its center at o1 and radius at R1. Generally, R2 is much larger than R1, and h2 is the arch height of C2. The ratio of h2 to the chord length determined by C2 is 1 / 100 to 1 / 50. The arch height design ensures that the arc at the location of the coil skeleton arc segment is inscribed in the circles containing the two adjacent arcs, allowing the strip of the arc segment to exhibit a slightly curved state. This allows the strip to fit as closely as possible to the coil skeleton arc segment without causing significant changes in the coil skeleton dimensions. The arc and the two adjacent arcs should both meet the requirement of minimum curvature of the strip bending.

[0040] Figure 8 This is a top view of the strip coil wound on the coil frame. Taking the upper strip coil 4 as an example, it can be seen that the inner side of the upper strip coil 4 also maintains the same curvature as the arc segment 902 of the coil frame, which can ensure that the upper strip coil 4 is in close contact with the coil frame 9. The inner curvature of the upper strip coil 4 is naturally formed when the superconducting strip is wound layer by layer, which has the advantages of uniform stress distribution and tight winding.

[0041] Figure 9 This is a schematic diagram of the intermediate partition plate in the modular racetrack-shaped coil in which the superconducting tape and coil skeleton are closely attached. The intermediate partition plate 2 has a thin plate structure and a racetrack shape, and has a certain thickness, generally greater than 1 mm, to ensure mechanical strength. It serves to separate the upper tape coil 4 and the lower tape coil 5. The inner contour of the intermediate partition plate 2 is slightly larger than the outer contour of the coil skeleton 9 by 0.1~0.5 mm, so that the intermediate partition plate 2 can be placed on the outside of the coil skeleton 9.

[0042] The middle partition plate 2 is provided with a middle partition plate middle section opening 202 in one long side, so as to provide a path for the superconducting tape when the middle partition plate 2 is placed outside the coil former 9.

[0043] The middle partition plate 2 is provided with a middle partition plate front section opening 201 in one short side, and the aperture can be set according to the need, generally about 1 mm, so as to facilitate the leading out and partial fixing of the voltage leads in the upper tape coil 4 and the lower tape coil 5. The positions of the middle partition plate middle section opening 202 and the middle partition plate front section opening 201 can be adjusted according to the positions of the voltage leads in the tape coil and the need of winding.

[0044] Figure 10 The electrode terminal in the superconducting tape and coil former close type modular racetrack coil of the application is shown in the schematic diagram, the number of motor terminals is 2, and the material is generally red copper or oxygen-free copper. The first electrode terminal 6 and the second electrode terminal 7 are provided with a fastening bolt hole 602 and an electrode limiting edge 603 on the upper side, and a current lead fixing bolt hole 601 is provided on the front side. The electrode limiting edge 603 is located in the middle of the adjacent two fastening bolt holes 602, and the height, width and length of the electrode limiting edge are generally less than the height, width and length of the aforementioned electrode limiting groove 104, so as to ensure smooth installation and fixing.

[0045] The electrode limiting groove 104 and the electrode limiting edge 603 additionally serve as the limiting mechanism of the first electrode terminal 6 and the second electrode terminal 7, that is, after the front side of the first electrode terminal 6 and the second electrode terminal 7 is reliably welded with the upper tape coil 4 and the lower tape coil 5, the first electrode terminal 6 and the second electrode terminal 7 need to be fastened, and the current lead also needs to be fastened on the first electrode terminal 6 and the second electrode terminal 7. If the limiting mechanism is missing, the above fastening process will definitely cause the first electrode terminal 6 and the second electrode terminal 7 to shake, which will cause the partial displacement of the upper tape coil 4 and the lower tape coil 5, and even cause the irreversible twisting, bending and damage of the superconducting tape, and in severe cases, will cause the loss of superconducting coil. Therefore, the electrode limiting groove 104 and the electrode limiting edge 603 are also an important innovation of the application.

[0046] The mounting relationship of each component in the superconducting tape and coil former close type modular racetrack coil is clearly shown by the above explanation of the drawings, which is beneficial to the person skilled in the art to implement the present application. The first fastening bolt 8010 and the first fastening nut 8011 constitute a set of fasteners. Similarly, the second fastening bolt 8020 and the second fastening nut 8021 constitute a second set of fasteners, and the tenth fastening bolt 80100 and the tenth fastening nut 80110 constitute a tenth set of fasteners. After the upper tape coil 4 and the lower tape coil 5 are wound on the coil former 9, the coil support is fastened by the first to sixth sets of fasteners. Specifically, the fastening bolt is fastened and connected with the fastening nut after passing through the bolt hole on the lower cover plate, the coil former bolt hole, and the bolt hole on the lower cover plate. The front side of the first electrode terminal 6 and the second electrode terminal 7 is respectively welded with the upper tape coil 4 and the lower tape coil 5. The current lead is drawn out from the current lead fixing bolt hole 601 of the electrode terminal, and the electrode terminal is fastened and connected with the coil support by the seventh to tenth sets of fasteners. Specifically, the fastening bolt is fastened and connected with the fastening nut after passing through the electrode bolt hole on the lower cover plate, the fastening bolt hole 602 of the electrode terminal, and the electrode bolt hole on the lower cover plate.

[0047] The above description is only one embodiment of the present application, which is more specifically an embodiment of a modular racetrack coil with two layers of superconducting coils, i.e., the upper tape coil 4 and the lower tape coil 5, having an upper cover plate 1, an intermediate partition plate 2, a lower cover plate 3, a coil former 9, two electrode terminals, and ten sets of fasteners. The structural diagram and combination relationship of each component are given. However, this embodiment is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application, such as replacing the upper tape coil 4 and the lower tape coil 5 with other number of layers, e.g., one layer, three layers, four layers, five layers, etc., providing an intermediate partition plate between the adjacent two layers of tape coils, updating the four straight line segments of the coil former 9 to arc line segments, or modifying the fasteners to other shapes or technologies to fasten each component, should be included in the protection scope of the present application.

[0048] It should be noted that in the embodiment, directional nouns such as "upper side", "lower side", "left side", "right side", "front side", "rear side", "outer side", "inner side", and quantity pronouns such as "one" are introduced, which should not be understood as a limitation of the present application, but for the convenience of explaining the combination relationship of different components and the specific details of the present application.

[0049] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the underlying principles illustrated and supported by the described examples can be employed in other embodiments without departing from the true scope of the application. Therefore, the present application is not intended to be limited to the described embodiments but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Claims

1. A modular racetrack-shaped coil with superconducting tape and coil frame tightly attached, characterized in that, The application relates to a coil support, at least one electrode terminal and at least one layer of strip coil; the coil support comprises a coil framework, the at least one layer of strip coil is wound on the coil framework, each layer of strip coil is welded on an electrode terminal, the coil framework is a structure composed of four circular arc segments and four connecting segments, the outer side presents a rectangular circular corner and an arc line contour, the four connecting segments comprise two straight line segments and two arc line segments, the two straight line segments are located at short side segments, the two arc line segments are located at long side segments, and the circles where the two circular arc segments adjacent to the arc line segments are located are inscribed in the arc lines where the arc line segments are located. The ratio of the arch height to the chord length of the arc line is 1 / 100-1 / 50.

2. The superconducting tape and former tight form modular racetrack coil of claim 1 wherein, The coil support further comprises an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are respectively located on the upper side and the lower side of the coil framework, and cover plate bolt holes and plate holes are formed in the upper cover plate and the lower cover plate.

3. The superconducting tape and former tight form modular racetrack coil of claim 1 or 2, wherein, Coil framework bolt holes are formed in the coil framework.

4. The superconducting tape and former tight form modular racetrack coil of claim 3 wherein, At least one pair of electrode bolt holes are further formed in the upper cover plate and the lower cover plate, each pair of electrode bolt holes comprises two electrode bolt holes, and an electrode limiting groove is formed between the two electrode bolt holes.

5. The superconducting tape and former tight form modular racetrack coil of claim 4 wherein, The upper side of the electrode terminal is provided with fastening bolt holes and an electrode limiting edge, the front side of the electrode terminal is provided with a current lead fixing bolt hole, the electrode limiting edge is located in the middle of the two adjacent fastening bolt holes, and the electrode limiting edge is clamped with the electrode limiting groove when the electrode terminal is arranged in the space region between the upper cover plate and the lower cover plate.

6. The superconducting tape and former tight form modular racetrack coil of claim 5 wherein, The coil support further comprises at least one middle partition plate arranged outside the coil framework, and each middle partition plate is used for spacing two adjacent layers of strip coils.

7. The tightly nested modular racetrack coil of superconducting tape and former of claim 6, wherein, The middle partition plate is a hollow rectangular structure, and middle partition plate middle segment openings and middle partition plate front segment openings are formed in the hollow rectangular structure.

8. The superconducting tape and former tight form modular racetrack coil of claim 7 wherein, After the at least one layer of strip coil is wound on the coil framework, the components in the coil support are fastened through a fastening assembly.

9. The tightly nested modular racetrack-shaped coil of superconducting tape and former of claim 8, wherein, Each layer of strip coil is welded on the front side of an electrode terminal, a current lead is led out from the current lead fixing bolt hole, and the electrode terminal is fastened and connected with the coil support through a fastening member.

10. The superconducting tape and former tight form modular racetrack coil of claim 8 wherein, ​

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