Operation Characteristics of Wireless Power Charging from Copper Antenna at 300 K to Superconducting Receiver at 77K with 13.56 MHz under Different Materials of Cooling Vessels

The wireless power transfer (WPT) using magnetic resonance coupling method has been known to have the advantage of being able to transfer power across large air gap with considerably high efficiency. As well as, as such a method can eliminate the physical contact loss in the system, it provides an ideal solution for the problem of contact losses in the power applications. Especially, since it is difficult to reduce the energy loss at connectors in the high temperature superconducting (HTS) magnet system, the WPT technology has been promisingly expected as a noble option to transfer electric power without physical contact from room temperature to very low temperature cooling vessel. From this point of view, authors proposed the combination WPT technology with HTS coils, it is called as, superconducting wireless power transfer (SUWPT) system. The SUWPT technique can be expected to solve the problem of the contact loss in the HTS joints, as well as, use with high levels of and low study, safety maintenance. In this authors examined transfer profiles between copper enameled antenna and HTS receiver coil with the usable frequency range at 13.56 MHz of RF power amplifier as long as the receiver is within 1.5 m distance under Styrofoam and stainless cooling vessels, respectively.