Study On Electromagnetic Vibration And Noise Of Permanent Magnet Synchronous Motor In Electric Vehicle

As people pay more and more attention to environmental protection and energy issues,the requirements for electric vehicles are increasing.Therefore,it is of great significance to improve the performance and comfort of electric vehicles.Permanent magnet synchronous motor has a series of advantages,such as simple structure,high efficiency,high reliability and wide range of speed regulation.It has a broad application prospect in electric vehicles,but its vibration and noise also put forward higher requirements.Therefore,the research on how to reduce the vibration noise of permanent magnet synchronous motor has important practical significance.In this paper,the structural parameters of the permanent magnet synchronous motor for electric vehicles are optimized,and the electromagnetic vibration and noise of the motor are reduced under the premise of ensuring the motor performance is basically unchanged.The main research contents are as follows:(1)Analyze the influence of motor structure parameters on motor performance.Basic invariable in order to guarantee the motor performance and reduce vibration noise with permanent magnet synchronous motor of electric vehicle,the purpose of to the cogging torque and no-load counter electromotive force,no-load losses and salient pole ratio as evaluation index analysis,analysis of motor air-gap length and magnetic bridge,reinforcement,at the bottom of the pole to the shaft surface distance structure parameters influence the performance of motor,Determine the overall noise reduction design scheme of the motor.(2)The optimization design scheme of permanent magnet synchronous motor structure parameters based on PSO-DE is proposed.In order to reduce the cog torque of permanent magnet synchronous motor,reduce the vibration noise of permanent magnet synchronous motor used in electric vehicle,the electrical structural parameters of the machine were optimized.Particle Swarm Optimization-Differential Evolution algorithm was used to optimize the magnetic pole structure and the length of the air gap.Finally,the obtained values were compared with the Maxwell simulation before and after optimization,which showed the superiority of the proposed motor structure parameters.(3)Conduct modal analysis and noise simulation on the motor to verify the feasibility of the optimization schemeStructural parameters of the optimized motor modal analysis by ANSYS workbench to motor,including freedom of the stator modal and fixed constraint modal analysis,the rotor free modal and fixed constraint modal analysis,and finally to the simulation calculation,the noise of the motor rated conditions to validate the optimized parameters,on the basis of the basic performance of motor,can effectively reduce the motor noise,so as to determine the feasibility of the optimization scheme.(4)Design the vibration and noise simulation platform of permanent magnet synchronous motor for electric vehicles.Using GUI toolbox of MATLAB to design the cogging torque in permanent magnet synchronous motor of electric vehicle simulation software experimental platform,the different structure parameters of the permanent magnet motor simulation comparison,different structure parameters can be more intuitive and convenient research the influence of the cogging torque of motor,and to study and analyze the performance of the electric motor provides the convenience.