Design and Torque Ripple Optimization of U-type Permanent Magnet Synchronous Motor

In this paper, the design of U-type permanent magnet motor is analyzed from several aspects such as slot-pole combination, the design of stator and rotor, and the selection of material. Then, a 3kW, 12000rpm U-type permanent magnet motor is designed. By studying the relationship between air gap magnetic field and electromagnetic torque, an optimization method is proposed to reduce torque ripple by improving the air gap magnetic field. The rotor auxiliary slot is taken as the optimization object, and the air gap magnetic field is optimized by response surface algorithm. The results show that optimizing the air gap magnetic field by designing the rotor auxiliary slots play an important role in reducing the torque ripple, lowering the motor loss and improving the motor performance.