Optimal Design of Amorphous Permanent Magnet Synchronous Motor Based on Cogging Torque and Efficiency

Because of its advantage of low core loss, amorphous alloy can replace traditional silicon steel as motor stator core, which can significantly improve motor efficiency. Based on the analysis of an 18kW amorphous permanent magnet synchronous motor, the structure of it is optimized by using optimized pole-slot combination, step skewing of rotor and multi-objective genetic algorithm for cogging torque and efficiency at low speed and high torque. Through finite element method and prototype experiment, it can be seen from the cogging torque waveform and efficiency MAP chart of the initial motor and the optimized motor, that the cogging torque is greatly dropped after optimization, and the efficiency at low speed and high torque is also improved. These prove the effectiveness of the optimal design.