Post-Quench Analysis and Mechanical Considerations for No-Insulation HTS Racetrack Field Coils in a 5 MW Superconducting Motor

High-power-density superconducting motors are essential for the electrification of transportation systems. High-temperature superconducting (HTS) motors with no-insulation (NI) windings have advantages in achieving high current density, stability, and protection. In this paper, a 5 MW motor is designed, featuring high-energy NI HTS field coils. A post-quench analysis was conducted to investigate its characteristics. Considering critical current and mutual inductance, a lumped circuit model was used to simulate the quench. Thermal modeling was performed to evaluate the temperature rise. Simulation results show an azimuthal overcurrent of 130% of the operating current and a temperature rise of 117 K. Stress analysis for each racetrack coil was conducted, revealing a maximum hoop stress of 882 MPa, which can lead to the degradation of the critical current. To reinforce the racetrack coils, …