An Ironless Megawatt Superconducting Motor System

Abstract

The invention discloses an iron-free megawatt superconducting motor system. The ironless structure superconducting rotor in this system includes a coil frame, a superconducting excitation coil, and a torque tube connected to the coil frame; the superconducting excitation coil is wound on the upper and lower surfaces of the coil frame, forming a convoluted U-shaped structure. The two adjacent effective excitation sides are parallel to each other, respectively constituting the positive pole or the negative pole of a pair of magnetic poles; The excitation sides are symmetrical with respect to the coil frame, and the directions of the excitation currents of the two effective excitation sides that are symmetrical to each other are the same. Compared with the prior art, the present invention has a better excitation effect and mechanical performance than the racetrack type excitation coil through the structural design of the superconducting excitation coil and its supporting frame and torque tube, and can well solve the problem of removing the iron core. The excitation effect, mechanical stress and support protection problems of the superconducting excitation coil.

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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