Development of Inductive Wireless Charging Systems for HTS Magnet Applications

High-temperature superconductor (HTS) magnets have demonstrated significant potential for generating high magnetic fields and transporting DC current with minimal power loss, making them essential components in advanced applications such as NMR, MRI, and superconducting motors. HTS magnets are typically operated in power-driven mode, which requires a busbar to connect the power supply at room temperature with the magnet placed in the cryogenic environments. However, this method allows substantial heat to enter the cryogenic environments from the room temperature environments, reducing the system's efficiency and stability. To address this issue, our previous study proposed an inductive coupling-based contactless current charging system that removes the physical electrical connection between room temperatures electronics and the cryogenic magnet, enabling excitation designed for a HTS coil operating in cryogenic environments. This system effectively demonstrated feasibility through finite element analysis, electrical circuit simulations, and prototype experiments. In this study, we aim to extend the application of this technology to larger-scale HTS coils. The research will focus on the design and fabrication of a system capable of charging HTS coils efficiently while addressing challenges such as optimizing coupling coefficients and ensuring robust performance under cryogenic conditions. This result is expected to provide a practical and scalable approach to contactless current charging for HTS magnet, enabling broader adoption in advanced superconducting applications.