This study introduces a cooling topology for a rotating field coil that integrates the supply of liquid hydrogen (LH 2 ) fuel with the cooling flow path in a High Temperature Superconductor (HTS) motor. The distinguishing feature of this system is the use of cryogenic LH 2 as both refrigerant supplied to the HTS rotor and fuel supplied to a fuel cell. The HTS rotor is fitted with a simple reservoir-shaped heat exchanger and includes both thermal and mechanical design considerations. To supply LH2 to the high-speed rotating HTS rotor, a cryogenic coupling structure is implemented using a coaxial triple pipe that includes both vacuum insulation layer and Ferro fluid seal. This research describes design process to minimize external heat load and ensure cooling down to 30 K during initial cooling and operation. In addition, thermal analysis is conducted through a commercial FEM analysis in consideration of the rotor components. Based on the design process and results, the fabrication and performance evaluation of the HTS rotor will be conducted.
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Kim et al. (2024) studied this question.