超5 kW的超导无线功率传输，高功率密度，适用于工业应用和快速电池充电
Superconducting Wireless Power Transfer Beyond 5 kW at High Power Density for Industrial Applications and Fast Battery Charging
摘要：
已知基于常规铜线圈的现有技术无线功率传输（WPT）系统在谐振耦合的中程状态下操作时展现出远高于90%的效率。除了完整的系统效率，传输线圈的面积和重量相关的功率密度是高功率应用的关键指标。本文报道了一个功能齐全的WPT系统，由单个煎饼高温超导（HTS）线圈的发射器和接收器侧，这超过了大多数传统系统的功率密度。尽管线圈尺寸紧凑，但在6 kW输出功率下实现了97%以上的DC-DC效率。接下来的基本线圈设计，分析和数值模拟的交流损耗在高温超导线圈，考虑到磁滞和涡流的贡献。通过单线圈的实验AC损耗测量，通过标准锁定技术获得高达4 kHz的频率，验证了结果。最后，在不同的频率和负载条件下的整个系统的性能的实验结果。
英文摘要：
State of the Art Wireless Power Transfer (WPT) systems, based on conventional copper coils, are known to exhibit efficiencies well above 90% when operated in the resonantly coupled mid-range regime. Besides full system efficiency, the area- and weight-related power densities of the transmission coils are key figures of merit for high power applications. This paper reports on a fully functional WPT system, consisting of single pancake high-temperature superconducting (HTS) coils on the transmitter and the receiver side, which exceeds the power density of most conventional systems. Despite a compact coil size, a DC-to-DC efficiency above 97% is achieved at 6 kW output power. Next to the fundamental coil design, analytical and numerical simulations of the AC loss in the HTS coils are shown, taking into account both hysteresis and eddy current contributions. The results are validated by experimental AC loss measurements of single coils, obtained by a standard lock-in technique up to frequencies of 4 kHz. Finally, experimental results of the full system performance at different frequencies and load conditions are presented.
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