MgB_2高温超导发电机设计及转子结构优化

Design of MgB_2 HTS generator and its rotor structure optimization

高温超导发电机由于转子无铁芯,导致气隙磁场畸变,严重影响发电机的输出性能。本文使用MgB2线材作为高温超导发电机的励磁绕组,并将灰色系统理论引入到高温超导发电机的励磁绕组结构的设计中,解决了转子无铁芯型高温超导电机励磁绕组端部气隙磁场畸变的优化问题。借助电磁场有限元程序设计方法,成功设计了一台功率为50kW的高温超导发电机。

Because of ironless rotor in the high temperature superconducting（HTS） generator, its air-gap magnetic field is distorted, which seriously affects the output performance and produces high losses of the generator. These losses will further affect the cooling system and may cause the superconducting material transiting to the normal con-ducting state. In this paper, the novel high temperature superconducting material MgB2 which is more economic, easy to manufacture and suitable for process, has been used as field winding to generate high magnetic field in the air-gap. Instead of the traditional magnetic circuit method which is difficult in applying to the situation, the gray system theory has been introduced to solve the structural optimization design of the field winding, and we use this theory to minimize the magnetic distortion at the ends of the field coils. With the electromagnetic finite element pro-gramming, we successfully design a 50kW HTS generator.