Abstract
This paper introduces a novel flux switching synchronous generator (FSSG) using high-temperature superconducting (HTS) field coils. Unlike conventional superconducting synchronous generators, the HTS field coils in the proposed FSSG are mounted in the stator and do not rotate during operation. Therefore, the design and fabrication of the cooling and excitation systems for HTS field coils are easier than those for the conventional superconducting synchronous generator. To verify the feasibility of the structure, a 15 MW-class FSSG was designed using a fundamental design methodology considering the mechanical stress of the rotor core. The design methodology uses mechanical and electromagnetic equations. It defines the size of the rotor first using mechanical equations for the rotor and designs the HTS field winding and armature winding using the electromagnetic equations and an FEM analysis. In addition, the operational characteristics of the FSSG were analyzed by a transient motion analysis using the FEM program. This paper could be utilized to develop superconducting synchronous generators.
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