Analysis And Suppression Of Electromagnetic Vibration And Noise Of V Rotor Permanent Magnet Motor Driven By Electric Vehicle

The permanent magnet drive motor of a electric vehicle is one of its key components.It is related to the dynamic,operational and NVH performance of the whole vehicle.Unlike traditional fuel vehicles,the vibration and noise level of permanent magnet synchronous motor used for driving electric vehicles directly affects the ride comfort.The permanent magnet synchronous motor of V type magnetic steel rotor is widely used in the field of electric vehicles because of its high output and high efficiency.The study of electromagnetic vibration and noise reduction methods for permanent magnet synchronous motor is mainly focused on improving the coordination of the pole slot,changing the arc coefficient and adjusting the air gap length.The influence of rotor structure on the electromagnetic vibration noise of permanent magnet motor is less.Therefore,this paper mainly analyzes and restraining electromagnetic vibration noise of electric motor driven by V magnetic steel rotor permanent magnet synchronous motor.Based on the theoretical analysis and the Ansys multi physical field finite element analysis platform,the electromagnetic noise characteristics of an electric vehicle driven permanent magnet synchronous motor are studied and the optimization analysis is carried out.First,the electromagnetic analysis of the motor is carried out and the finite element simulation analysis is carried out.The air gap radial magnetic density of the motor is calculated,and the electromagnetic excitation force on the stator tooth of the motor is calculated by Maxwell tensor method.The modal analysis of the motor is carried out,and the 3D finite element model of the motor structure is established,and the radial modal frequencies of the motor structure are obtained through simulation.The calculated electromagnetic excitation force is coupled to the 3D finite element model of the motor structure to analyze the vibration response of the motor,and the vibration response spectrum of the motor stator structure is obtained.Finally,the electromagnetic noise characteristics of the motor are obtained by the finite element simulation analysis of the sound field.The electromagnetic noise of the motor mainly comes from the electromagnetic excitation force of the stator teeth of the motor,and different rotor structures can produce different effects on the magnetic field.The influence of different structural parameters on the electromagnetic field of the motor is analyzed from the different structural parameters of the motor,so as to provide a reference for the optimization design of the electromagnetic vibration of the motor.By optimizing the structure of the rotor Isolation Bridge,the electromagnetic excitation force of the stator teeth of the motor is changed to reduce the vibration and noise of the motor.The results of the comparison and optimization show that the optimized motor can effectively reduce the vibration and noise of the motor under the premise of guaranteeing the electromagnetic performance,and the effectiveness of the simulation results is verified by the experiment.