Current bridge of double-pancake coil and combined double-pancake coil

Abstract

The invention provides a current bridge of a double-pancake coil, which is used for connecting a coil wire and comprises a first mounting plate, a second mounting plate and a superconducting tape, the first mounting plate and the second mounting plate are oppositely arranged, a first wiring surface and a second wiring surface are arranged on the upper edge and the lower edge of the surface, facing the second mounting plate, of the first mounting plate respectively, and superconducting wires are fixed to the surface, facing the first mounting plate, of the second mounting plate. The projection of the first wiring surface on the second mounting plate extends to the projection of the second wiring surface on the second mounting plate; and when the two coil connecting wires are respectively fixed on the first connecting surface and the second connecting surface, the superconducting tape is electrically contacted with the two coil connecting wires to form a superconducting path. According to the current bridge of the double-pancake coil, the current bridge can be conveniently formed between the two double-pancake coils, small-radius bending of the coil wiring for connecting the double-pancake coils is not needed, and the situation that the superconducting performance is reduced or even damaged due to bending of the coil wiring with the ceramic property is avoided.

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 part, which is composed of multiple double-pancake coils and a supporting frame. These coils play a vital role in the operation of the motor. Each double-pancake coil is finely wound with strip wire. The formed coil will generate a strong magnetic field when the rotor rotates, thereby driving the operation of the motor. After the coil is wound, in order to achieve effective current transmission between coils, two wires will be left in each coil, connected to the previous and next coils respectively.

[0003] In the design of superconducting motors, the bending limit of the ribbon wire at the coil connection has become an urgent problem to be solved. This problem is mainly due to the special physical properties of superconducting tapes. These wires are generally made of ceramic materials. Although they have high superconducting properties, they are also brittle and have low ductility, which makes them prone to cracks or breaks when bent with small curvatures.

[0004] When the wire is bent to a small curvature, stress concentration will occur inside the material, which may lead to the loss of superconductivity or the degradation of electrical performance, or even the breakage of the wire. Therefore, when designing a conductive device, it is necessary to consider how to avoid bending with a small curvature to ensure that the coil will not be damaged during operation. In addition.

[0005] This bending restriction not only affects the performance of the motor, but may also increase the complexity of the manufacturing process. If the coils cannot be arranged flexibly, it will limit the overall design freedom of the motor, affecting its compactness and adaptability, and thus increase production costs. Therefore, developing a conductive connection device that can overcome this limitation will help improve the reliability of superconducting motors, reduce production complexity, and thus improve 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: In a first aspect, the present invention provides a current bridge for a double pancake coil, used to connect coil wiring, comprising 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 first wiring surface and the second wiring surface are respectively arranged on the upper and lower edges of the surface of the first mounting plate facing the second mounting plate, and 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.

[0008] As a preferred embodiment, the first wiring surface and the second wiring surface are sunken to form a groove for accommodating the coil wiring.

[0009] As a preferred implementation, the middle portion of the second mounting plate is sunken to form a groove for accommodating the superconducting tape.

[0010] As a preferred embodiment, the superconducting tape is composed of a plurality of superconducting wires arranged side by side.

[0011] As a preferred embodiment, the current bridge of the double-pancake coil further includes an insulating shell; 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 cover the top of the first mounting plate and the second mounting plate.

[0012] 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-disc coil.

[0013] 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.

[0014] As a preferred embodiment, the superconducting tape is superconductingly welded to the coil connection.

[0015] On the other hand, the present invention also provides a combined double-pancake coil, including a plurality of double-pancake coils, each double-pancake coil having two coil connections, and also including a plurality of 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 a double-pancake coil, and the second connection surface is electrically contacted with the coil connection of another double-pancake coil, so that the plurality of double-pancake coils are electrically connected in sequence.

[0016] As a preferred implementation, a current bridge installation 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 installation slot.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The current bridge of the double pancake coil of the present invention can conveniently form a current bridge between two double pancake coils, without the need to bend the coil wiring with a small radius in order to connect the double pancake coils, thus avoiding the bending of the coil wiring with ceramic properties, which leads to a decrease in superconducting performance or even damage. The combined double pancake coil of the present invention uses the current bridge of the double pancake coil to ensure convenient and stable connection, improve the reliability of the superconducting motor, reduce the complexity of production, and thus improve the reliability and economic benefits of power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is a schematic diagram of a current bridge of a double-pancake coil according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of a double-pancake coil according to an embodiment of the present invention; Figure 3 is a schematic structural diagram of a first mounting plate according to an embodiment of the present invention; Figure 4 is a schematic structural diagram of a second mounting plate and a superconducting tape according to an embodiment of the present invention; Figure 5 is a schematic structural diagram of an insulating housing according to an embodiment of the present invention; Figure 6 It is a schematic structural diagram of a combined double-pancake coil according to an embodiment of the present invention. Reference numerals: 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

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] Below, the specific embodiments of the present invention are described in detail with reference to the accompanying drawings. The following description with reference to the accompanying drawings is provided to assist in the understanding of the exemplary embodiments of the present invention as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but they are to be regarded as exemplary 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. Moreover, in order to make the description more clear and concise, detailed descriptions of functions and structures well known in the art will be omitted.

[0021] like Figure 1 FIG. 1 is 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 such as Figure 2 The coil wiring is connected between the double pancake coils shown.

[0022] See the schematic diagram of the structure of the current bridge components for Figure 3 , Figure 4 .in, Figure 3 The figure shows a schematic diagram of the structure of the first mounting plate 1. The middle part of one side of the first mounting plate 1 is protruding, and the upper and lower sides are sunken to form two grooves that are parallel to each other and extend horizontally from left to right. The bottom surface of the upper groove is the first wiring surface 101, and the bottom surface of the lower groove is the second wiring surface 102. The depth of the first wiring surface 101 and the second wiring surface 102 is equal to the thickness of the coil wiring, so that when the coil wiring is installed on the first wiring surface 101 or the second wiring surface 102, the coil wiring is flush with the protruding middle part.

[0023] Figure 4 (a) is a schematic diagram of the structure of the second mounting plate 2. The middle part 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.

[0024] Figure 4 (b) is a schematic diagram of the second mounting plate 2 when the superconducting tape 3 is installed, and the superconducting tape 3 is installed longitudinally 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, so that when the superconducting tape 3 is installed on the second mounting plate 2, the superconducting tape 3 is flush with the protruding ends of the second mounting plate 2.

[0025] Therefore, when the first mounting plate 1 is attached to the second mounting plate 2 , the coil connections installed on the first wiring surface 101 and the second wiring surface 102 and the superconducting tape 3 installed in the superconducting tape installation groove 201 are both clamped between the first mounting plate 1 and the second mounting plate 2 .

[0026] According to the above structure, in the two Figure 2 When connecting the double pancake coils, the coil connection of the upper double pancake coil is inserted into the groove where the first wiring surface 101 is located along the horizontal direction, and the coil connection of the lower double pancake coil is inserted into the groove where the second wiring surface 102 is located along the horizontal direction, and then the first mounting plate 1 is attached to the second mounting plate 2, so that the top end of the superconducting tape 3 is attached to the coil connection installed on the first wiring surface 101, and the bottom end is attached to the coil connection installed on the second wiring surface 102, forming a superconducting path with the two coil connections, thereby connecting the upper and lower double pancake coils.

[0027] The first mounting plate 1 and the second mounting plate 2 are made of metal material and are fixedly connected to the coil wiring and the superconducting tape 3 by welding.

[0028] Superconducting welding can be used between the coil connection and the superconducting tape 3 to connect the coil connection and the superconducting surface of the superconducting tape 3. This welding method has only a very small joint resistance, which can enable the current bridge to obtain the best superconducting performance. In addition, brazing welding can also be used between the coil connection and the superconducting tape 3. Although it will increase the joint resistance, it can also meet the resistance requirements of the current bridge. The brazing process is simple, low-cost, and has better operability.

[0029] 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.

[0030] See also Figure 1 and Figure 5 In order to make the current bridge of the present invention only connected to the coil wiring of the upper and lower double-pancake coils and 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.

[0031] Specifically, the insulating housing is composed of Figure 5 (a) The insulating top plate 4 shown and Figure 5 (b) is composed of an insulating bottom plate 5, a first mounting plate 1 and a second mounting plate 2 are sandwiched in the middle, and the upper edge of the insulating top plate is bent 90 degrees to form an insulating side wall 401 that shields the first mounting plate 1, the second mounting plate 2, the superconducting tape 3 and the coil wiring from the upper side. When multiple current bridges of this embodiment are sequentially arranged in a series of double-pancake coils, the insulating shell ensures insulation between the current bridge and the double-pancake coil, and the insulation of adjacent current bridges is achieved through the isolation of the insulating side wall 401.

[0032] 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 .

[0033] See also Figure 3 , Figure 4 and Figure 5 Through holes 103, 202, 402, 502 corresponding to the positions are respectively provided 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. 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 screws passing through the through holes 402, 103, 202, 502 in sequence.

[0034] 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 arranged on the upper and lower end surfaces.

[0035] Each of the two-pancake coils has two coil connections, and also includes a current bridge disposed between two adjacent two-pancake coils, such as the two-pancake coils of the above embodiment; A current bridge installation slot is set in the middle of the side of each double-pancake coil, and two coil wires are led out from the left and right side slot walls of the current bridge installation slot. No matter how large the coil size of the double-pancake coil is, the width of the current bridge installation slot opened in the middle of the side remains unchanged, so that the current bridge can be used to connect double-pancake coils of various winding sizes.

[0036] 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 welds 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 welds the superconducting tape, thereby electrically connecting the four double-pancake coils shown in the figure in sequence. The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. 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 here, 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 adaptive change of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are 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; the upper and lower edges of the surface of the first mounting plate (1) facing the second mounting plate (2) are respectively provided with a first wiring surface (101) and a second wiring surface (102); 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 wiring surface (101) on the second mounting plate (2) to the projection of the second wiring surface (102) on the second mounting plate (2); when two coil wirings are respectively fixed on the first wiring surface (101) and the second wiring surface (102), the superconducting tape (3) is in electrical contact with the two coil wirings to form 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 arranged to be sunken to form a groove for accommodating the coil wiring.

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

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

5. A double-pancake coil current bridge as claimed in 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 edge of the insulating top plate is vertically bent to form an insulating side wall (401) to shield the top 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 bottom plate (5), and screws are passed through the mounting screw hole (501) to fix the insulating bottom plate (5) to the double-pancake coil.

7. A double-pancake coil current bridge as claimed in claim 5, characterized in that: The insulating top plate (4), the insulating bottom plate (5), the first mounting plate (1) and the second mounting plate (2) are provided with corresponding through holes at both ends, 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. A double-pancake coil current bridge as claimed in 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 a plurality of 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 a double-pancake coil, and the second wiring surface (102) is electrically contacted with the coil wiring of another double-pancake coil, so that the plurality of double-pancake coils are electrically connected in sequence.

10. A combined double-pancake coil as claimed in claim 9, characterized in that: A current bridge installation slot is arranged 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 installation slot.

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