Optimization Design of Superconducting Shielding Layer in Double-Stator HTS Electrical Machine

High-temperature superconducting (HTS) electrical machines can offer high efficiency and power density, but the HTS magnets in these machines commonly suffer performance degradation caused by external alternating magnetic fields. Hence, superconducting shielding layers (SSLs) are used to enhance the critical current and reduce the AC loss of HTS magnets. Therefore, optimizing the design of SSLs is crucial to achieving the optimal performance of HTS magnets. In this paper, focusing on a double-stator HTS machine (DS-HTSM), a layered multi-objective optimization design based on parameter sensitivity analysis is conducted for SSLs, in which both the structural parameters and positions of SSLs are optimized simultaneously. A quantitative performance comparison of HTS magnets between initial and optimal design is conducted by using the finite element analysis (FEA), and the results demonstrate an improvement in the critical current safety margin, a significant reduction in AC loss, and effective space utilization, thus providing valuable insights for the design of high-performance HTS electrical machines.