Comparative Study on Loss Characteristics of High-Temperature Superconducting Coils under Low Magnetic Field

The AC loss of a high-temperature superconducting (HTS) coil is directly related to a superconducting power device’s efficiency and operation cost, so the HTS coil has always been the research hot spot superconducting technology. Under the condition of the same, total amount of superconducting tape used, three kinds of superconducting coil models, namely single-pancake coil with single tape winding, single-pancake coil with double tapes winding, and double-pancake coil with double tapes winding, are built by using the finite element simulation software. By changing the external magnetic field’s frequency and intensity, the characteristics of tape stacking and cake coil are studied, and the superconducting coil structure with the lowest loss under different working conditions is explored. Through simulation analysis and comparison, it was found that the overall performnace of single-pancake coil with double tapes winding is the best. It provides a reference for the design of a superconducting coil structure under the quantitative superconducting tape condition.