A Design Scheme of Low-Speed High-Torque Permanent Magnet Synchronous Motor

This study focuses on the requirement of reducing vibration and noise in low-speed, high-torque propulsion motors used by large unmanned undersea vehicles(UUVs). Furthermore, a low-speed high-torque permanent magnet synchronous motor with a rated power of 100 kW and a rated speed of 250 r/min is designed. First, a motor electromagnetic scheme is designed based on the magnetic circuit method. Subsequently, the finite element model of the motor’s segmented skewed slot is established, and the no-load back electromagnetic force, cogging torque, electromagnetic torque, and other parameters are analyzed. Finally, the prototype is developed and tested. Test results indicate the feasibility of the design scheme for achieving a low-speed, high-torque, permanent magnet synchronous motor.