Short-Circuit Fault Demagnetization Assessment and Optimization of Double-Electrical-Port Vernier Permanent Magnet Motor

In this paper, to mitigate the risk of irreversible motor demagnetization during short-circuit faults, a demagnetization assessment and design optimization approach is proposed for the double-electrical-port vernier permanent magnet (DEP-VPM) motor. First, an electromagnetic coupling assessment is introduced to accurately evaluate the motor's transient demagnetization characteristics under short-circuit fault conditions. Then, motor optimization model, considering short-circuit faults, is developed to enhance the anti-demagnetization capability and increase the output torque. Furthermore, three different optimization methods are employed and compared in detail, and the optimal motor design is determined. Finally, based on electromagnetic performances simulation, the effectiveness of the proposed demagnetization assessment and optimization approach can be verified. It lays a solid foundation for the design of motors with enhanced anti demagnetization capability under short-circuit fault conditions.