High-temperature superconductor coil magnets with extremely high-quality factors have unique advantages and broad prospects when applied to high-power wireless power transfer, especially under low-frequency conditions. For different resonant frequencies, the power peak and transfer efficiency of superconductor wireless power transfer have different dependencies. Meanwhile, the structure of the coil also significantly affects the AC loss of the superconductor coil, which in turn affects the transfer performance. Therefore, the appropriate operating frequency band and coil structure are conducive to improving the power peak and transfer efficiency of superconductor wireless power transfer systems. We modeled a high-power superconductor wireless power transfer system based on finite element simulation and analyzed in detail the transfer characteristics of the superconductor wireless power transfer system under different coil structures, current-carrying strengths, and operating frequencies. It is found that when the resonant frequency and input current strength are the same, the effect of changing the coil structure on the peak transfer power can reach several kilowatts, and the transfer efficiency is as high as 99% or more under the optimal conditions.
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This work was supported in part by the Strategic Priority Research Program of the ChineseAcademy of Sciences, Grant No.XDB25000000, National Natural Science Foundation (52172271),the National Key R&D Program of China No. 2022YFE03150200, Shanghai Science and Technology Innovation Program (22511100200)