Coreless type megawatt superconducting motor system

Abstract

The invention discloses a coreless type megawatt superconducting motor system. The coreless type megawatt superconducting motor system comprises a superconducting rotor of coreless structure, wherein the superconducting rotor of the coreless structure comprises a coil skeleton, superconducting excitation coils and a torque tube connected with the coil skeleton, the superconducting energizing coils are wound around the upper surface and the lower surface of the coil skeleton and wound in convolution U structure, each two adjacent effective excitation edges are parallel to each other and respectively form a positive pole and a negative pole in a pair of magnetic poles, the effective excitation edges of the superconducting energizing coil wound around the upper surface of the coil skeleton and the effective excitation edges of the superconducting energizing coil wound around the lower surface of the coil skeleton are symmetric around the coil skeleton, and exciting current directions of each two effective excitation edges which are symmetric around the coil skeleton are the same. Compared with the prior art, the coreless type megawatt superconducting motor system has better excitation effects and mechanical properties than a track type excitation coil through structure design of the superconducting excitation coils, the support skeleton of the superconducting excitation coils and the torque tube, and can commendably solve the problems of excitation effect reduction, mechanical stress change and support protection reduction of the superconducting excitation coils, generated after iron cores are removed.

Description

technical field [0001] The invention relates to an ironless megawatt class superconducting motor system with a convoluted U-shaped structure superconducting excitation coil. Background technique [0002] The biggest advantages of superconducting motors are high efficiency, small size and light weight. For large motor systems of more than ten megawatts, such as wind turbines and ship propulsion motors, an iron core structure is usually used on the rotor to constrain the magnetic circuit, strengthen the magnetic field, and at the same time support and protect the superconducting excitation coil. However, the iron core structure also has its negative effects, such as the existence of magnetic saturation, which affects the linear increase of the air gap magnetic density, and at the same time greatly increases the quality of the system and increases the difficulty of transportation and assembly. Theoretically, adopting a hollow structure can well solve the above-mentioned proble...

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Problems solved by technology

However, the iron core structure also has its negative effects, such as the existence of magnetic saturation, which affects the linear increase of the air gap magnetic density, and at the same time greatly increases the quality of the system, increasing the difficulty of transportation and assembly

Theoretically, adopting a hollow structure can well solve the above-mentioned problems caused by the iron core structure, but since the iron core is removed, not only the excitation effect is greatly reduced, but also the centrifugal force and Lorentz force will directly act on the superstructure. On the guiding excitation coil, especially for the track-type excitation coils that are structurally independent, the effect is particularly obvious. In severe cases, such as a short-circuit fault, the superconducting material will be deformed or even broken, which will seriously affect the normal operation of the entire system.

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