High-Tc superconducting (HTS) synchronous machines have promising application prospects due to their high power-to-mass ratio and high efficiency. Most existing HTS synchronous machines are excited by traditional driven mode through current leads which incur considerable cryogenic heat load and maintenance difficulty of the rotating-stationary parts. Using HTS dynamo to wirelessly charge HTS rotor magnet has been a promising alternative solution, but is limited by the drawback of rotation-excitation coupling.

In this work, we demonstrate a synchronous machine with HTS rotator windings which are wirelessly powered by a transformer-self rectifier. The new approach not only dealt with the disadvantages of traditional driven mode, but also managed to decouple the excitation from rotation. This work may be of practical significance for the design and implementation of HTS synchronous machines in the future.