High-temperature superconducting film magnet

Abstract

The invention discloses a high-temperature superconducting film magnet which belongs to the technical field of superconducting electrotechnics. According to the high-temperature superconducting film magnet, high-temperature superconducting films serve as a basic unit, lines are etched and electrodes are preset on each layer of films to control current flow directions, and every two layers are electrically connected in parallel or in series to form the large magnet. The high-temperature superconducting film magnet has the advantages that the current density is high, a magnetic field can be generated in a small space, a magnetic field of the complex shape can be generated and fast excitation can be achieved, and the magnet is a good supplement to traditional magnets formed on the basis of lead winding.

Description

technical field [0001] The invention belongs to the technical field of superconducting electrical engineering, and relates to a high-temperature superconducting thin-film magnet. Background technique [0002] A superconducting magnet can be defined in a narrow sense as a superconducting coil winding for the purpose of generating a background magnetic field. In a broad sense, it can be defined as any coil winding made of wire to provide ampere turns. Magnet windings can construct various superconducting devices according to the peripheral equipment and different use conditions. For example, a superconducting magnet purely providing a background magnetic field. In addition, there are superconducting current limiters, superconducting accumulators, superconducting motors, superconducting magnetic separators, and superconducting induction heaters. The core components of these superconducting devices are high-temperature superconducting windings. [0003] Traditional supercond...

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Problems solved by technology

[0004] However, there are several problems in the use of high-temperature superconducting wound magnets: first, high-temperature superconducting is a kind of oxide ceramic material, and the material is prone to fracture in nature, so the inner diameter of the superconducting magnet cavity cannot be small, such as using Bi2223 / Ag more For magnets wound with core superconducting wires, the radius of the inner cavity of the magnet should not be less than 2.5cm. If it is less than this value, the current-carrying performance of the strip will decrease significantly.

Therefore, the magnets wound with high-temperature superconducting wires should not be small in size.

Second, because the high-temperature superconducting wire is relatively fragile, the strip cannot be bent arbitrarily in space, and cannot form a more complex winding structure, resulting in a relatively simple shape of the magnet produced by the high-temperature superconducting magnet

Third, the common feature of magnets wound with wires is that the inductance of the magnet is relatively large. Generally, the inductance is proportional to the square of the number of turns of the winding. As a DC magnet winding, the inductance is not a big problem, but if transient excitation is required, For demagnetized magnets and magnets that require AC operation, large inductance will directly cause large inductive reactance, which limits the excitation speed and demagnetization speed

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