Research On Modeling And Vibration Noise Suppression Strategy Of Automotive Permanent Magnet Synchronous Moto

Since China proposed and implemented the "double carbon" strategy,the concept of energy saving and environmental protection in the automotive industry has become more popular,and the electrification and intelligence of vehicles are on the rise.Due to their highperformance advantages,permanent magnet synchronous motors are widely used as drive motors for electric vehicles.However,the vibration and noise during the operation of permanent magnet synchronous motors can affect the comfort of the driver and passengers of electric vehicles.Therefore,it is of great significance to study the factors affecting vibration and noise during the operation of permanent magnet synchronous motors and find better control strategies to improve the performance of the motors and enhance the comfort of drivers and occupants.This paper proposes a method to reduce vibration and noise during the operation of automotive permanent magnet synchronous motors,starting from the vibration and noise generation mechanism.The main contents of this paper are as follows:(1)According to the structure type and working principle of permanent magnet synchronous motors,based on the principle of constant amplitude,the mathematical model of permanent magnet synchronous motors under different coordinate systems is deduced by using the principle of coordinate transformation,which makes the study of permanent magnet synchronous motors for control strategy more concise and intuitive.On this basis,the typical control methods of permanent magnet synchronous motors are analyzed and compared.(2)The causes of torque ripple during the operation of permanent magnet synchronous motors are analyzed in terms of both the body structure and the control system,and the radial electromagnetic force of permanent magnet synchronous motors under no-load and load conditions is analyzed using the analytical method to derive the radial electromagnetic force frequencies that have a significant impact on the operation of permanent magnet synchronous motors.According to the motor control principle,the mathematical model of the harmonics of the permanent magnet synchronous motors and the expression of the relationship between harmonics and electromagnetic torque is derived to obtain that the fifth and seventh harmonic currents are the main influencing factors for the vibration and noise generation of the permanent magnet synchronous motors.(3)A harmonic injection method is proposed to suppress the vibration and noise of permanent magnet synchronous motors for vehicles.An overall Simulink simulation model of a vehicle with a built-in permanent magnet synchronous motor based on a Maximum Torque Per Ampere control strategy is developed.Aiming at the main factors affecting the vibration and noise of permanent magnet synchronous motors,the impact of the fifth and seventh harmonic currents is reduced by injecting harmonic voltage,and the effectiveness of the harmonic injection method in suppressing the vibration and noise of permanent magnet synchronous motor is verified.(4)A test platform for vibration and noise testing of automotive permanent magnet synchronous motors is built.The vibration and noise parameters of the permanent magnet synchronous motor operation are measured by using vibration acceleration sensor and sound pressure gauge sensor.The test data are analyzed to verify the effectiveness of the simulation model and the harmonic injection method by comparing the vibration and noise results before and after the harmonic injection with two different control strategies.