Abstract
The magnetic field inside the analyzed double-stator high-temperature-superconducting machine (DS-HTSM) has the characteristics of rich harmonics and non-negligible amplitude, which will seriously reduce the critical current <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I<sub>c</sub></i> of HTS-excitation coil. Therefore, a new compound magnetic shielding (CMS) is proposed in this paper, which is composed of a copper shield layer and a combined flux diverters (FDs) including the silicon steel sheet (SSS) FD and the Fe-based nanocrystalline alloy (FNA) FD. The key is that the iron loss of SSS FD located in the inner Dewar can be reduced due to the flux pre-diversion of the FNA FD on the outside. In addition, the FEA model based on the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</i> - <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">A</i> formula for HTS-excitation coil is built, based on which the optimal design of proposed CMS is conducted. The results show that the critical current <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I<sub>c</sub></i> of HTS-excitation coil in the analyzed DS-HTSM can be improved by 36% after using the proposed CMS.
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