The usage of high-temperature superconducting (HTS) coils in magnetically-coupled resonant wireless power transfer (WPT) systems can considerably improve the transfer efficiency, and hence it attacked great attention. However, there are few studies on offset characteristics in HTS WPT systems. In order to further improve the performance of HTS WPT systems, we have studied experimentally the influences of relative displacement of the coils on the transfer efficiency and load receiving power (LRP) in a magnetically-coupled resonant WPT system. The WPT systems using copper coils and HTS coils were carefully compared. The results show that the transfer efficiency decreases monotonically with the increasing offset. However, there is an optimal position for the LRP to achieve the maximum value. Both the transfer efficiency and LRP of the HTS WPT system are higher than those of the copper WPT system under the same conditions.

在磁耦合谐振无线电力传输（WPT）系统中使用高温超导（HTS）线圈可以大大提高传输效率，因此备受关注。但是，关于HTS WPT系统中的偏移特性的研究很少。为了进一步提高HTS WPT系统的性能，我们在磁耦合谐振WPT系统中实验研究了线圈的相对位移对传输效率和负载接收功率（LRP）的影响。仔细比较了使用铜线圈和HTS线圈的WPT系统。结果表明，传输效率随偏移量的增加而单调降低。但是，LRP有一个达到最大值的最佳位置。