The Multiphysics Analysis and Suppression Method for the Electromagnetic Noise of Permanent-Magnet Motors Used in Electric Vehicle

A method for predicting the electromagnetic noise of a permanent-magnet motor based on the coupling of electromagnetic force and modal is proposed. Firstly, a theoretical analysis and finite element method are combined to establish an electromagnetic force analysis model for a 6-pole 36-slot permanent-magnet motor used in vehicles. The spatial order and frequency characteristics of the electromagnetic force are analyzed. Then, the modal array of the motor is calculated using the finite element method, and the main sources of the motor vibration noise are predicted by combining the electromagnetic force with the modal frequency array of each order. Finally, a vibration noise multiphysics simulation analysis model is established using the finite element method, and the electromagnetic noise is calculated. The simulation results are consistent with the predicted results, verifying the effectiveness of the analysis method.