Reduction of Electromagnetic Vibration and Noise in Permanent Magnet Motor for EVs by Optimizing Design of Rotor Based on GPR-PSO Model

摘要

Radial electromagnetic force of motor causes electromagnetic vibration and noise. Reasonable improvement of the rotor structure can effectively reduce the radial electromagnetic force and weaken the electromagnetic vibration and noise. Based on a permanent magnet synchronous motor for EVs, this paper proposes an improved rotor structure with auxiliary flux barriers to reduce the radial electromagnetic force, thereby weakening the electromagnetic vibration and noise. The sample data sets of the relationship among the parameters of the improved rotor structure, the radial electromagnetic force and the output torque of the motor are established by the orthogonal method. Gaussian process regression models are used to fit the data sample sets. Then the regression functions are used as fitness function and constraint function for particle swarm optimization. Thus the optimal rotor structure parameters are gotten. The radial electromagnetic forces of motor before and after improvement are simulated. Then the vibration and noise characteristics are analyzed and compared. The results show that the improved structure can reduce the vibration and noise effectively on the premise of ensuring the electromagnetic performance. The modal analysis and strength check are carried out to ensure the rationality of the improvement. The validity of the simulation results is verified by experiments.