A resistance-free high-temperature superconducting closed coil

Abstract

The present invention discloses a resistance-free high-temperature superconducting closed coil, and relates to the technical field of high-temperature superconducting coil winding. The resistance-free high-temperature superconducting closed coil comprises: a first coil frame and a first four-pancake coil; the side surface of the first coil frame comprises a first annular region, a second annular region, a third annular region and a fourth annular region sequentially distributed from one end to the other end; the first four-pancake coil is wound by a first resistance-free winding method; the first resistance-free winding method is: winding starts from the right end of the separated superconducting tape, forming a first coil and a fourth coil in the first annular region and the fourth annular region; passing the left end of the superconducting tape between the first coil and the fourth coil, rotating the first coil frame, forming a second coil and a third coil in the second annular region and the third annular region; and then forming a first four-pancake coil. The present invention can eliminate the coil joint, avoid the loss of the joint resistance, and thus reduce the current attenuation of the closed-loop coil.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature superconducting coil winding, in particular to a resistance-free high-temperature superconducting closed coil. Background Art

[0002] Superconducting magnets are widely used in magnetic resonance imaging, superconducting energy storage, and extremely high field scientific research due to their small size and low energy consumption. The current mainstream structure of high-temperature magnets is to generate a higher magnetic field by stacking multiple double-pancake coils. Since the double-pancake coils need to be connected by superconducting joints, the number of joints increases with the increase in the number of coils. Another major factor restricting the development of high-temperature superconducting magnets is the joint problem. Whether it is a brazed joint, a silver diffusion welded joint, or a superconducting joint, there is a certain joint resistance, and the smaller the resistance, the more complicated the manufacturing process of the joint. For this reason, in the application of superconducting magnets, especially in the winding process of the second-generation high-temperature superconducting magnets, the number of superconducting joints should be minimized, or even avoided. Summary of the invention

[0003] The purpose of the present invention is to provide a resistance-free high-temperature superconducting closed coil, which can eliminate coil joints, avoid joint resistance loss, and further reduce current attenuation of the closed-loop coil.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A resistance-free high-temperature superconducting closed coil, comprising:

[0006] A first coil bobbin and a first four-pancake coil;

[0007] The first coil frame includes two double-cake circular ring frames; the end faces of the two double-cake circular ring frames are connected, and the centers of the two double-cake circular ring frames are located on the same straight line; the side surface of the first coil frame includes a first circular ring area, a second circular ring area, a third circular ring area and a fourth circular ring area distributed in sequence from one end to the other end;

[0008] The first four-pancake coil is wound by a first resistance-free winding method;

[0009] The first resistance-free winding method is:

[0010] Separating the superconducting tape along a central dividing line to form two unseparated ends, left and right, and two separated superconducting tapes; the length of the central dividing line is less than the length of the superconducting tape;

[0011] Starting from the right end of the superconducting tape, winding the two separated superconducting tapes at the end is respectively wound around the first circular area and the fourth circular area to form a first coil and a fourth coil;

[0012] Pass the left end of the superconducting tape through between the first coil and the fourth coil, rotate the first coil frame to rotate the right end of the superconducting tape by 180 degrees, and wind the two separated superconducting tapes at this end around the second annular region and the third annular region, respectively, to form a second coil and a third coil;

[0013] The first coil, the second coil, the third coil and the fourth coil constitute the first four-pancake coil.

[0014] Optionally, the left end of the superconducting tape is passed between the first coil and the fourth coil, and the right end of the superconducting tape is rotated 180° by rotating the first coil skeleton, and the two separated superconducting tapes at this end are respectively wound around the second annular region and the third annular region to form a second coil and a third coil, which specifically includes:

[0015] Winding the left end of the superconducting tape on a transition device at a set distance;

[0016] The first coil skeleton is rotated to allow the left end after winding to pass between the first coil and the fourth coil. The right end of the superconducting tape is rotated 180° by rotating the first coil skeleton, and the left end wound on the transition device is released, so that the two separated superconducting tapes at this end are respectively wound on the second circular ring area and the third circular ring area to form a second coil and a third coil.

[0017] Optionally, the set distance is half the length of the superconducting tape.

[0018] Optionally, the transition device is a circular ring-shaped device.

[0019] The present invention also provides another resistance-free high-temperature superconducting closed coil, comprising:

[0020] a second coil bobbin and a second four-piece coil;

[0021] The second coil skeleton includes a first single-cake circular ring skeleton, a second single-cake circular ring skeleton, a third single-cake circular ring skeleton and a fourth single-cake circular ring skeleton; the first single-cake circular ring skeleton, the second single-cake circular ring skeleton, the third single-cake circular ring skeleton and the fourth single-cake circular ring skeleton are sequentially connected through end faces, and the centers of the first single-cake circular ring skeleton, the second single-cake circular ring skeleton, the third single-cake circular ring skeleton and the fourth single-cake circular ring skeleton are located on the same straight line;

[0022] The second four-pancake coil is wound by a second resistance-free winding method;

[0023] The second resistance-free winding method is:

[0024] Separating the superconducting tape along a central dividing line to form two unseparated ends, left and right, and two separated superconducting tapes; the length of the central dividing line is less than the length of the superconducting tape;

[0025] Starting from the right end of the superconducting tape, by rotating the first single-disk circular ring frame and the fourth single-disk circular ring frame, the two separated superconducting tapes at this end are respectively wound on the arc surface of the first single-disk circular ring frame and the arc surface of the fourth single-disk circular ring frame to form a fifth coil and an eighth coil;

[0026] Then, winding starts from the left end of the superconducting tape, and by rotating the second single-disk circular ring frame and the third single-disk circular ring frame, the two separated superconducting tapes at this end are respectively wound on the arc surface of the second single-disk circular ring frame and the arc surface of the third single-disk circular ring frame to form a sixth coil and a seventh coil;

[0027] The fifth coil, the sixth coil, the seventh coil and the eighth coil constitute the second four-pancake coil;

[0028] Among them, the rotation direction of the first single-cake circular ring skeleton and the fourth single-cake circular ring skeleton is a first direction, and the rotation direction of the second single-cake circular ring skeleton and the third single-cake circular ring skeleton is a second direction; the first direction and the second direction are opposite.

[0029] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0030] The present invention discloses a resistance-free high-temperature superconducting closed coil, comprising a coil frame and a four-pancake coil; wherein the coil frame adopts two double-pancake circular ring frames or four single-pancake circular ring frames, and the superconducting tape separated along the central dividing line is wound on the coil frame by a resistance-free winding method, and the first coil, the second coil, the third coil and the fourth coil are formed in sequence, and the four coils formed above constitute the four-pancake coil. The resistance-free high-temperature superconducting closed coil of the present invention uses the resistance-free winding method to replace the existing original joints with intact endpoints, and after the resistance-free high-temperature superconducting closed coil is energized, the generation of resistance is avoided, and the current attenuation of the closed-loop coil is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 This is a schematic structural diagram of a double-pancake ring skeleton used in a resistance-free high-temperature superconducting closed coil of the present invention;

[0033] Figure 2 It is a schematic diagram of cutting the superconducting tape of the resistance-free high-temperature superconducting closed coil of the present invention;

[0034] Figure 3 A diagram showing the winding process of the resistance-free high-temperature superconducting closed coil of the present invention using a transition device;

[0035] Figure 4 This is a schematic structural diagram of a resistance-free high-temperature superconducting closed coil of the present invention using a single-pancake ring skeleton.

[0036] Explanation of symbols:

[0037] 1-right end; 2-left end; 3-double-cake circular ring skeleton; 4-separated superconducting tape; 5-superconducting tape; 6-center dividing line; 7-transition device; 8-first single-cake circular ring skeleton; 9-second single-cake circular ring skeleton; 10-third single-cake circular ring skeleton; 11-fourth single-cake circular ring skeleton. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The purpose of the present invention is to provide a resistance-free high-temperature superconducting closed coil, which can eliminate coil joints, avoid joint resistance loss, and further reduce current attenuation of the closed-loop coil.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] like Figure 1 As shown, an embodiment of the present invention provides a resistance-free high-temperature superconducting closed coil, comprising:

[0042] A first coil skeleton and a first four-pancake coil.

[0043] The first coil skeleton includes two double-cake circular ring skeletons 3; the end faces of the two double-cake circular ring skeletons 3 are connected, and the centers of the two double-cake circular ring skeletons 3 are located on the same straight line; the side surface of the first coil skeleton includes a first circular ring area, a second circular ring area, a third circular ring area and a fourth circular ring area distributed in sequence from one end to the other end; the first four-cake coil is wound by a first resistance-free winding method.

[0044] The first resistance-free winding method is:

[0045] In the first step, the superconducting tape 5 is separated along the central dividing line 6 to form two unseparated ends on the left and right and two separated superconducting tapes 4; the length of the central dividing line 6 is less than the length of the superconducting tape 5, such as Figure 2 shown.

[0046] The second step is to start winding from the right end portion 1 of the superconducting tape 5 so that the two separated superconducting tapes 4 at this end are respectively wound around the first circular area and the fourth circular area to form a first coil and a fourth coil.

[0047] In the third step, the left end 2 of the superconducting tape 5 is passed between the first coil and the fourth coil, and the right end 1 of the superconducting tape 5 is rotated 180° by rotating the first coil frame, and the two separated superconducting tapes 4 at this end are respectively wound around the second annular region and the third annular region to form a second coil and a third coil. The first coil, the second coil, the third coil and the fourth coil constitute the first four-pancake coil.

[0048] The third step of the first resistance-free winding method specifically includes:

[0049] like Figure 3 As shown, the left end 2 of the superconducting tape 5 is wound on the transition device 7 at a set distance. The first coil frame is rotated to allow the wound left end 2 to pass between the first coil and the fourth coil. The right end 1 of the superconducting tape is rotated 180° by rotating the first coil frame, and the left end 2 wound on the transition device is released, so that the two separated superconducting tapes 4 at this end are respectively wound on the second annular region and the third annular region to form a second coil and a third coil.

[0050] Specifically, when the first coil skeleton is rotated, the double-ring skeleton 3 whose two end faces are connected and whose skeleton centers are located on the same straight line rotates in the same direction. When the first coil skeleton is rotated, the transition device 7 rotates in a set direction at the same time; the set direction is determined by the direction in which the left end 2 of the superconducting tape 5 is wound around the transition device 7.

[0051] As a preferred embodiment, the set distance is half of the length of the superconducting tape. The transition device 7 is a circular ring device. The length and width of the superconducting tape are determined by the set number of turns and the set diameter of the four-pancake coil. This is not an example, and the set distance and transition device can be selected accordingly according to the needs in actual applications.

[0052] In this embodiment, the four-piece coils wound by the first resistance-free winding method all use "outer joints", that is, the first coil, the second coil, the third coil and the fourth coil are wound on the side surface of the first coil frame, and are distributed and connected in sequence from one end to the other end. After the closed-loop current is passed through such a four-piece coil, not only is the connection from the inside of the coil to be avoided, thereby avoiding the generation of resistance, but also after the four-piece coil is separated left and right, the magnetic field can be enhanced to each other.

[0053] like Figure 4 As shown, the present invention also provides another resistance-free high-temperature superconducting closed coil, comprising:

[0054] A second coil skeleton and a second four-piece coil.

[0055] The second coil skeleton includes a first single-cake circular ring skeleton 8, a second single-cake circular ring skeleton 9, a third single-cake circular ring skeleton 10 and a fourth single-cake circular ring skeleton 11; the first single-cake circular ring skeleton 8, the second single-cake circular ring skeleton 9, the third single-cake circular ring skeleton 10 and the fourth single-cake circular ring skeleton 11 are connected in sequence through end faces, and the centers of the first single-cake circular ring skeleton 8, the second single-cake circular ring skeleton 9, the third single-cake circular ring skeleton 10 and the fourth single-cake circular ring skeleton 11 are located on the same straight line; the second four-cake coil is wound by a second resistance-free winding method.

[0056] The second resistance-free winding method is:

[0057] In the first step, the superconducting tape 5 is separated along the central dividing line 6 to form two unseparated left and right ends and two separated superconducting tapes 4 ; the length of the central dividing line 6 is less than the length of the superconducting tape 5 .

[0058] The second step is to start winding from the right end portion 1 of the superconducting tape 5, by rotating the first single-cake circular ring skeleton 8 and the fourth single-cake circular ring skeleton 11, so that the two separated superconducting tapes 4 at this end are respectively wound on the arc surface of the first single-cake circular ring skeleton 8 and the arc surface of the fourth single-cake circular ring skeleton 11 to form the fifth coil and the eighth coil.

[0059] The third step is to start winding from the left end portion 2 of the superconducting tape 5, and by rotating the second single-cake circular ring skeleton 9 and the third single-cake circular ring skeleton 10, the two separated superconducting tapes 4 at this end are respectively wound on the arc surface of the second single-cake circular ring skeleton 9 and the arc surface of the third single-cake circular ring skeleton 10 to form the sixth coil and the seventh coil; the fifth coil, the sixth coil, the seventh coil and the eighth coil constitute the second four-cake coil; wherein, the rotation direction of the first single-cake circular ring skeleton 8 and the fourth single-cake circular ring skeleton 11 is the first direction, and the rotation direction of the second single-cake circular ring skeleton 9 and the third single-cake circular ring skeleton 10 is the second direction; the first direction is opposite to the second direction.

[0060] As a preferred embodiment, the length and width of the superconducting tape are determined by the set number of turns and the set diameter of the four-pancake coil. This is not an example, and the set distance and transition device can be selected accordingly according to the needs of actual applications.

[0061] In this embodiment, the four-piece coils wound by the second resistance-free winding method all use "outer joints", that is, the fifth coil, the sixth coil, the seventh coil and the eighth coil are wound on the side surface of the second coil frame and are distributed and connected in sequence from one end to the other end. After the closed-loop current is passed through such a four-piece coil, not only is the connection from the inside of the coil avoided, thereby avoiding the generation of resistance, but also after the four-piece coil is separated left and right, the magnetic field can be enhanced to each other.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A resistance-free high-temperature superconducting closed coil, characterized in that: include: A first coil bobbin and a first four-pancake coil; The first coil frame includes two double-cake circular ring frames; the end faces of the two double-cake circular ring frames are connected, and the centers of the two double-cake circular ring frames are located on the same straight line; the side surface of the first coil frame includes a first circular ring area, a second circular ring area, a third circular ring area and a fourth circular ring area distributed in sequence from one end to the other end; The first four-pancake coil is wound by a first resistance-free winding method; The first resistance-free winding method is: Separating the superconducting tape along a central dividing line to form two unseparated ends, left and right, and two separated superconducting tapes; the length of the central dividing line is less than the length of the superconducting tape; Starting from the right end of the superconducting tape, winding the two separated superconducting tapes at the end is respectively wound around the first circular area and the fourth circular area to form a first coil and a fourth coil; Pass the left end of the superconducting tape through between the first coil and the fourth coil, rotate the first coil frame to rotate the right end of the superconducting tape by 180 degrees, and wind the two separated superconducting tapes at this end around the second annular region and the third annular region, respectively, to form a second coil and a third coil; The first coil, the second coil, the third coil and the fourth coil constitute the first four-pancake coil; The step of passing the left end of the superconducting tape through between the first coil and the fourth coil, rotating the first coil skeleton to rotate the right end of the superconducting tape by 180°, and winding the two separated superconducting tapes at the end around the second annular region and the third annular region to form a second coil and a third coil specifically includes: Winding the left end of the superconducting tape on a transition device at a set distance; The first coil skeleton is rotated to allow the left end after winding to pass between the first coil and the fourth coil. The right end of the superconducting tape is rotated 180° by rotating the first coil skeleton, and the left end wound on the transition device is released, so that the two separated superconducting tapes at this end are respectively wound on the second circular ring area and the third circular ring area to form a second coil and a third coil.

2. The resistance-free high-temperature superconducting closed coil according to claim 1, characterized in that: The set distance is half of the length of the superconducting tape.

3. The resistance-free high-temperature superconducting closed coil according to claim 1, characterized in that: The transition device is a circular ring device.

4. A resistance-free high-temperature superconducting closed coil, characterized in that: include: a second coil frame and a second four-piece coil; The second coil skeleton includes a first single-cake circular ring skeleton, a second single-cake circular ring skeleton, a third single-cake circular ring skeleton and a fourth single-cake circular ring skeleton; the first single-cake circular ring skeleton, the second single-cake circular ring skeleton, the third single-cake circular ring skeleton and the fourth single-cake circular ring skeleton are sequentially connected through end faces, and the centers of the first single-cake circular ring skeleton, the second single-cake circular ring skeleton, the third single-cake circular ring skeleton and the fourth single-cake circular ring skeleton are located on the same straight line; The second four-pancake coil is wound by a second resistance-free winding method; The second resistance-free winding method is: Separating the superconducting tape along a central dividing line to form two unseparated ends, left and right, and two separated superconducting tapes; the length of the central dividing line is less than the length of the superconducting tape; Starting from the right end of the superconducting tape, by rotating the first single-disk circular ring frame and the fourth single-disk circular ring frame, the two separated superconducting tapes at this end are respectively wound on the arc surface of the first single-disk circular ring frame and the arc surface of the fourth single-disk circular ring frame to form a fifth coil and an eighth coil; Then, winding starts from the left end of the superconducting tape, and by rotating the second single-disk circular ring frame and the third single-disk circular ring frame, the two separated superconducting tapes at this end are respectively wound on the arc surface of the second single-disk circular ring frame and the arc surface of the third single-disk circular ring frame to form a sixth coil and a seventh coil; The fifth coil, the sixth coil, the seventh coil and the eighth coil constitute the second four-pancake coil; Among them, the rotation direction of the first single-cake circular ring skeleton and the fourth single-cake circular ring skeleton is a first direction, and the rotation direction of the second single-cake circular ring skeleton and the third single-cake circular ring skeleton is a second direction; the first direction and the second direction are opposite.

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