A current bridge of double-pancake coil and combined double-pancake coil

Abstract

The present invention provides a current bridge for a double-pancake coil, which is used to connect coil wiring, including a first mounting plate, a second mounting plate, and a superconducting tape; the first mounting plate and the second mounting plate are arranged opposite to each other, and the upper and lower edges of the surface of the first mounting plate facing the second mounting plate are respectively provided with a first wiring surface and a second wiring surface; the superconducting wire is fixed on the surface of the second mounting plate facing the first mounting plate, and extends from the projection of the first wiring surface on the second mounting plate to the projection of the second wiring surface on the second mounting plate; when the two coil wirings are respectively fixed to the first wiring surface and the second wiring surface, the superconducting tape is in electrical contact with the two coil wirings to form a superconducting path. The current bridge for the double-pancake coil of the present invention can conveniently form a current bridge between the two double-pancake coils, without the need to bend the coil wiring with a small radius in order to connect the double-pancake coils, thereby avoiding the bending of the coil wiring with ceramic properties, which may cause the superconducting performance to degrade or even be damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of superconducting coils, and in particular relates to a current bridge of a double-pancake coil and a combined double-pancake coil. Background Art

[0002] The rotor of a superconducting motor is its core component, consisting of multiple double-panel coils and a supporting frame. These coils play a vital role in the motor's operation. Each double-panel coil is finely wound from a ribbon of wire. As the rotor rotates, the resulting coil generates a strong magnetic field, driving the motor. After the coils are wound, two wires are left in each coil to ensure efficient current transfer between them, connecting them to the preceding and following coils.

[0003] In the design of superconducting motors, the bending restrictions of the ribbon wires at the coil connections have become a pressing issue. This problem is mainly due to the special physical properties of superconducting ribbons. These wires are generally made of ceramic materials. Although they have high superconducting properties, they are also brittle and have low ductility, making them prone to cracking or breaking when bent at small curvatures.

[0004] When a wire is bent to a small curvature, stress concentration occurs within the material, potentially leading to loss of superconductivity, degradation of electrical performance, or even breakage of the connecting wire. Therefore, when designing conductive devices, consideration must be given to avoiding small bends to ensure the coil is not damaged during operation.

[0005] This bending restriction not only affects the performance of the motor but can also increase the complexity of the manufacturing process. If the coils cannot be flexibly arranged, the overall design freedom of the motor will be limited, affecting its compactness and adaptability, and thus increasing production costs. Therefore, developing a conductive connection device that can overcome this limitation will help improve the reliability of superconducting motors and reduce production complexity, thereby improving the reliability and economic benefits of power transmission. Summary of the Invention

[0006] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to at least solve one or more of the above-mentioned problems in the prior art, or to provide a current bridge and a combined double-pancake coil of a double-pancake coil that meet one or more of the above-mentioned needs.

[0007] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a double-pancake coil current bridge for connecting coil wiring, comprising a first mounting plate, a second mounting plate, and a superconducting tape;

[0009] The first mounting plate and the second mounting plate are arranged opposite to each other, and the first connection surface and the second connection surface are respectively provided on the upper and lower edges of the surface of the first mounting plate facing the second mounting plate. The superconducting wire is fixed to the surface of the second mounting plate facing the first mounting plate and extends from the projection of the first connection surface on the second mounting plate to the projection of the second connection surface on the second mounting plate. When the two coil connections are respectively fixed to the first connection surface and the second connection surface, the superconducting tape is in electrical contact with the two coil connections, forming a superconducting path.

[0010] As a preferred embodiment, the first wiring surface and the second wiring surface are sunken to form a groove for accommodating coil wiring.

[0011] As a preferred embodiment, the middle portion of the second mounting plate is sunken to form a groove for accommodating the superconducting tape.

[0012] As a preferred embodiment, the superconducting tape is composed of several superconducting wires arranged side by side.

[0013] As a preferred embodiment, the current bridge of the double-pancake coil further includes an insulating shell;

[0014] The insulating shell includes an insulating top plate and an insulating bottom plate. The first mounting plate and the second mounting plate are clamped between the insulating top plate and the insulating bottom plate. The edge of the insulating top plate is vertically bent to form an insulating side wall to block the top of the first mounting plate and the second mounting plate.

[0015] As a further preferred embodiment, a mounting screw hole is provided in the middle of the insulating base plate, and screws are passed through the mounting screw hole to fix the insulating base plate to the double-pancake coil.

[0016] As a further preferred embodiment, corresponding through holes are provided at both ends of the insulating top plate, the insulating bottom plate, the first mounting plate and the second mounting plate, and screws are fixedly connected through the through holes.

[0017] As a preferred embodiment, the superconducting tape and the coil connection are superconductingly welded.

[0018] On the other hand, the present invention also provides a combined double-pancake coil, including several double-pancake coils, each double-pancake coil having two coil connections, and also including several current bridges of the double-pancake coils as described above; the first connection surface of each current bridge is electrically contacted with the coil connection of one double-pancake coil, and the second connection surface is electrically contacted with the coil connection of another double-pancake coil, thereby electrically connecting the several double-pancake coils in sequence.

[0019] As a preferred embodiment, a current bridge mounting slot is provided on the side of each double-pancake coil, and two coil wirings are respectively led out from the left and right side slot walls of the current bridge mounting slot.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention's double-pancake coil current bridge conveniently connects two double-pancake coils, eliminating the need for tight bends in the coil wiring to connect them. This avoids the degradation or even damage to superconducting performance that can occur with ceramic coil wiring due to bending. The present invention's combined double-pancake coil current bridge ensures convenient and stable connection, improves the reliability of the superconducting motor, reduces production complexity, and thus enhances the reliability and economic benefits of power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 1 is a schematic diagram of a current bridge assembly of a double-pancake coil according to an embodiment of the present invention;

[0023] Figure 2 2 is a schematic structural diagram of a double-pancake coil according to an embodiment of the present invention;

[0024] Figure 3 is a structural schematic diagram of a first mounting plate according to an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a second mounting plate and a superconducting tape according to an embodiment of the present invention;

[0026] Figure 5 is a schematic structural diagram of an insulating housing according to an embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the structure of the combined double-pancake coil according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1-first mounting plate, 101-first wiring surface, 102-second wiring surface, 103-through hole, 2-second mounting plate, 201-superconducting tape mounting groove, 202-through hole, 3-superconducting tape, 4-insulating top plate, 401-insulating side wall, 402-through hole, 5-insulating bottom plate, 501-mounting screw hole, 502-through hole. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] Specific embodiments of the present invention are described below with reference to the accompanying drawings. The following description, with reference to the accompanying drawings, is provided to aid understanding of example embodiments of the present invention as defined by the claims and their equivalents. Various specific details are included to aid understanding, but they are to be considered as illustrative only. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Furthermore, for clarity and brevity, detailed descriptions of functions and configurations well known in the art may be omitted.

[0032] like Figure 1 The figure shows a schematic diagram of a current bridge of a double-pancake coil according to an embodiment of the present invention. The current bridge is used to connect any two coils as shown in FIG. Figure 2 The coil wiring is connected between the double pancake coils shown.

[0033] See the schematic diagram of the structure of the current bridge components for Figure 3 、 Figure 4 .in, Figure 3 The figure shows the structure of the first mounting plate 1. The center of one side of the first mounting plate 1 is convex, while the upper and lower sides are recessed, forming two parallel grooves extending horizontally from left to right. The bottom surface of the upper groove serves as the first wiring surface 101, and the bottom surface of the lower groove serves as the second wiring surface 102. The depth of the recesses in the first and second wiring surfaces 101 and 102 is equal to the thickness of the coil wiring. When the coil wiring is installed on the first or second wiring surface 101, 102, it is flush with the protruding center portion.

[0034] Figure 4 (a) is a schematic structural diagram of the second mounting plate 2. The middle portion of the second mounting plate 2 is sunken, and the left and right sides are convex, forming a superconducting tape mounting groove 201 extending longitudinally from the top to the bottom.

[0035] Figure 4 (b) shows the superconducting tape 3 installed on the second mounting plate 2. The superconducting tape 3 is longitudinally installed in the superconducting tape installation groove 201. The depth of the superconducting tape installation groove 201 is equal to the thickness of the superconducting tape 3. This ensures that when the superconducting tape 3 is installed on the second mounting plate 2, it is flush with the protruding ends of the second mounting plate 2.

[0036] Therefore, when the first mounting plate 1 and the second mounting plate 2 are attached to each other, the coil connections installed on the first connection surface 101 and the second connection surface 102 and the superconducting tape 3 installed in the superconducting tape installation groove 201 are all clamped between the first mounting plate 1 and the second mounting plate 2.

[0037] According to the above structure, when two Figure 2When connecting the double-pancake coils, the coil connection of the upper double-pancake coil is inserted horizontally into the groove where the first connection surface 101 is located, and the coil connection of the lower double-pancake coil is inserted horizontally into the groove where the second connection surface 102 is located. Then, the first mounting plate 1 and the second mounting plate 2 are abutted, so that the top end of the superconducting tape 3 is abutted against the coil connection installed on the first connection surface 101, and the bottom end is abutted against the coil connection installed on the second connection surface 102, forming a superconducting path with the two coil connections, thereby connecting the upper and lower double-pancake coils.

[0038] The first mounting plate 1 and the second mounting plate 2 are made of metal and are fixedly connected to the coil wiring and the superconducting tape 3 by welding.

[0039] Superconducting welding can be used to connect the coil wiring to the superconducting tape 3, creating a conductive connection between the coil wiring and the superconducting surface of the tape 3. This welding method results in minimal joint resistance, enabling the current bridge to achieve optimal superconducting performance. Alternatively, brazing can be used between the coil wiring and the superconducting tape 3. Although this increases the joint resistance, it still meets the resistance requirements of the current bridge. Furthermore, brazing offers a simple, low-cost process and improved operability.

[0040] The present invention also provides a structural example of the superconducting tape 3, see Figure 4 (b) Multiple superconducting wires are arranged side by side to form a vertical strip, connecting the coils at the upper and lower ends.

[0041] See also Figure 1 and Figure 5 In order to ensure that the current bridge of the present invention is only connected to the coil wiring of the upper and lower double-pancake coils to avoid short circuit with other parts of the double-pancake coils or other current bridges, the current bridge of the present invention is also provided with an insulating shell.

[0042] Specifically, the insulating shell is made of Figure 5 (a) shows the insulating top plate 4 and the Figure 5 (b) shows an insulating bottom plate 5, sandwiched between the first and second mounting plates 1 and 2. The upper edge of the insulating top plate is bent 90 degrees to form an insulating sidewall 401 that shields the first and second mounting plates 1 and 2, the superconducting tape 3, and the coil wiring from above. When multiple current bridges of this embodiment are sequentially installed within a series of double-pancake coils, the insulating housing ensures insulation between the current bridges and the double-pancake coils, and the insulating sidewall 401 provides insulation between adjacent current bridges.

[0043] See also Figure 5 (b) A row of mounting screw holes 501 is provided in the middle of the insulating base plate 5 , and screws are used to fix the insulating base plate 5 to the double-pancake coil through the mounting screw holes 501 .

[0044] See also Figure 3 、 Figure 4 and Figure 5 At both ends of the first mounting plate 1, the second mounting plate 2, the insulating top plate 4, and the insulating bottom plate 5, corresponding through holes 103, 202, 402, and 502 are respectively provided. The first mounting plate 1, the second mounting plate 2, the insulating top plate 4, and the insulating bottom plate 5 can be fixed by using screws to pass through the through holes 402, 103, 202, and 502 in sequence.

[0045] Another embodiment of the present invention further provides a combined double-pancake coil, see Figure 6 The combined double-pancake coil includes four double-pancake coils connected in sequence by the above-mentioned current bridge, and insulating baffles are set on the upper and lower end surfaces.

[0046] Each double-pancake coil has two coil connections and further includes a current bridge disposed between two adjacent double-pancake coils, such as the double-pancake coil of the above embodiment;

[0047] A current bridge mounting slot is located in the middle of each pancake coil's side, with two coil wires extending from the left and right walls of the slot. Regardless of the coil size, the width of the current bridge slot remains constant, allowing the current bridge to connect pancake coils of varying winding sizes.

[0048] In each current bridge, the coil connection of the upper double-pancake coil extends horizontally from the upper left into the first connection surface between the first mounting plate and the second mounting plate, contacts and is welded to the superconducting tape, and the coil connection of the lower double-pancake coil extends horizontally from the lower right into the second connection surface between the first mounting plate and the second mounting plate, contacts and is welded to the superconducting tape, thereby electrically connecting the four double-pancake coils shown in the figure in sequence.

[0049] The above is only an exemplary embodiment of the present disclosure and cannot be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure herein, those skilled in the art will easily think of the implementation scheme of the present disclosure. The present invention is intended to cover any variation, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not recorded in the present disclosure. The description and examples are to be regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A current bridge for a double-pancake coil, used to connect coil wiring, characterized in that: It comprises a first mounting plate (1), a second mounting plate (2), and a superconducting tape (3); The first mounting plate (1) and the second mounting plate (2) are arranged opposite to each other, and a first connection surface (101) and a second connection surface (102) are respectively provided on the upper and lower edges of the surface of the first mounting plate (1) facing the second mounting plate (2); the superconducting tape (3) is fixed on the surface of the second mounting plate (2) facing the first mounting plate (1), and extends from the projection of the first connection surface (101) on the second mounting plate (2) to the projection of the second connection surface (102) on the second mounting plate (2); when two coil connections are respectively fixed to the first connection surface (101) and the second connection surface (102), the superconducting tape (3) is in electrical contact with the two coil connections, forming a superconducting path.

2. A double-pancake coil current bridge as claimed in claim 1, characterized in that: The first wiring surface (101) and the second wiring surface (102) are sunken to form a groove for accommodating the coil wiring.

3. The double-pancake coil current bridge according to claim 1, characterized in that: The middle portion of the second mounting plate (2) sinks to form a groove for accommodating the superconducting tape (3).

4. The double-pancake coil current bridge according to claim 1, characterized in that: The superconducting tape (3) is composed of a plurality of superconducting wires arranged side by side.

5. The double-pancake coil current bridge according to claim 1, characterized in that: The current bridge of the double-pancake coil also includes an insulating shell; The insulating housing comprises an insulating top plate (4) and an insulating bottom plate (5); the first mounting plate (1) and the second mounting plate (2) are sandwiched between the insulating top plate (4) and the insulating bottom plate (5); the edges of the insulating top plate are vertically bent to form insulating side walls (401) to shield the upper parts of the first mounting plate (1) and the second mounting plate (2).

6. A double-pancake coil current bridge as claimed in claim 5, characterized in that: A mounting screw hole (501) is provided in the middle of the insulating base plate (5), and a screw is passed through the mounting screw hole (501) to fix the insulating base plate (5) to the double-pancake coil.

7. The double-pancake coil current bridge according to claim 5, characterized in that: Corresponding through holes are provided at both ends of the insulating top plate (4), the insulating bottom plate (5), the first mounting plate (1) and the second mounting plate (2), and screws are passed through the through holes to fix the insulating top plate (4), the insulating bottom plate (5), the first mounting plate (1) and the second mounting plate (2) in connection.

8. The double-pancake coil current bridge according to claim 1, characterized in that: The superconducting tape (3) is superconductingly welded to the coil connection.

9. A combined double-pancake coil, comprising a plurality of double-pancake coils, each of which has two coil connections, characterized in that: It also includes several current bridges of the double-pancake coils as described in any one of claims 1 to 8; the first wiring surface (101) of each of the current bridges is electrically contacted with the coil wiring of one double-pancake coil, and the second wiring surface (102) is electrically contacted with the coil wiring of another double-pancake coil, so as to electrically connect the several double-pancake coils in sequence.

10. The combined double-pancake coil according to claim 9, characterized in that: A current bridge mounting slot is provided on the side of each double-pancake coil, and two coil wirings are respectively led out from the left and right side slot walls of the current bridge mounting slot.

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