Synchronous motors using high magnetic field ReBCO coils in their field winding are suitable for large marine propulsion motors because of their high torque and compact size. In the ship propulsion HTS motors, the high current density and high magnetic field HTS field coils must be able to reliably and easily protect. To meet this requirement, it is considered to apply no-insulation HTS coils to the field winding of HTS synchronous machines. To apply NI HTS coils to the field winding of the large scale synchronous motor, it is necessary to evaluate the effects of turn-to-turn currents caused by such as the spatial harmonic magnetic field and current ripple in the stator on the motor characteristics. In this study, an electrical design of model 20 MW-class HTS synchronous motor with HTS field coils is presented. Based on this model, the effects of the electromagnetic behavior of the NI HTS field coils on the motor characteristics were numerically investigated.
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