Abstract
The application of high-temperature superconducting (HTS) equipment faces challenges that thick current leads connecting superconducting devices with external power sources will generate huge thermal load loss and the difficulty in persistent current operation for a long period. In this work, we have proposed the mechanism of a novel mechanically operated HTS energy converter based on the electromagnetic coupling of the permanent magnet and the HTS coil. The proposed HTS energy converter can charge and discharge a closed superconducting coil without electrical contact, and convert mechanical energy to electromagnetic energy efficiently. However, its working mechanism is theoretically controversial, as it seems to violate Lenz's law. An analytical method based on the method of equivalent circuit is proposed to explain its working mechanism and replicate all experimental electrical behaviour of the HTS energy converter. Experimental results have verified the theoretical analysis. The proposed mechanically operated HTS energy converter is easily controllable, making it promising in various of applications, including superconducting magnetic energy storage (SMES), high field magnets, energy harvesting of urban rail transportation and electromagnetic propulsion.
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