Development and Evaluation of an Inductive Coupling-Based Contactless Current Charging System for High-Temperature Superconductor Coils

This article addresses the design, manufacturing, and testing of a contactless current charging system for high-temperature superconductor (HTS) coils. Traditional methods of charging HTS coils typically involve power-driven techniques, which result in a substantial thermal load due to thermal conduction. To mitigate this issue, we developed a system using an inductive coupling technique. The design of this system focuses on optimizing the magnetic coupling coefficient to ensure efficient power transfer to the HTS coils. Essential components, such as a magnetic coupler, a resonance circuit, and a rectifier, were designed and manufactured to match the operating environment of the HTS coil. A series of practical current charging tests were conducted to evaluate the feasibility of the system. The results from these tests confirmed the successful contactless charging of HTS coils, indicating the system's potential applicability in various HTS magnet applications.