Research On Electromagnetic Vibration Characteristics And Control Of Permanent Magnet Synchronous Motors For Electric Vehicles

Under the environment of increasing air pollution and energy shortage,new energy electric vehicles have gradually become the research objects of scholars at home and abroad.In recent years,with the continuous development of science and technology and material technology,the performance of permanent magnet materials has also been greatly improved.Permanent Magnet Synchronous Motor(PMSM)has a simple mechanism and high operational reliability.The advantages of small size and high efficiency are gradually applied to the actuator of the electric vehicle servo system.However,due to the fact that the structure design of the motor body is not ideal and the nonlinear characteristics of the inverter make the motor stator current contain a large number of harmonics,these higher harmonics will directly generate electromagnetic torque ripple during the normal operation of the motor,resulting in Abnormal vibration and noise of the motor,these electromagnetic vibrations and noise will greatly reduce the life and efficiency of the motor.Therefore,domestic and foreign scholars will suppress the output electromagnetic torque ripple of permanent magnet synchronous motor as the main research direction of future research on new energy electric vehicles.Aiming at this kind of problem,this paper studies the vibration noise generation mechanism and suppression technology of permanent magnet synchronous motor,and adopts a control strategy to reduce the electromagnetic torque fluctuation caused by the magnetic field harmonics of the motor to reduce the motor running process.Vibration and noise caused by high harmonics generated by electromagnetic torque ripple.Firstly,this paper briefly introduces the basic structure and operation principle of permanent magnet synchronous motor.Based on this theory,the mathematical model is established,and the current motor control strategy with more mature technology and more use is introduced.Vector control and direct torque control.Then,the main reason for the electromagnetic torque ripple generated by PMSM during stable operation is obtained through analysis,and the harmonic mathematical model is derived on this basis.In this paper,a harmonic suppression strategy is adopted.The harmonic suppression strategy mainly uses the Euler-Fourier formula to extract the harmonic components of the three-phase stator current.These harmonic components are converted by voltage.After the module,the voltage components in the system need to be compensated,and the calculated d,q-axis voltage components are calculated,and then the reverse harmonic voltages that need to be compensated by the system are calculated,thereby realizing harmonic compensation and suppression,and reducing the harmonics of the motor due to high harmonics.Electromagnetic torque ripple and noise caused by waves.The overall design of this paper is based on space vector modulation(SVPWM),and the simulation model is built in MATLAB/SIMULINK environment.Using TI's DSP2812 as the main control chip,the hardware and software design of the system is carried out around the harmonic suppression strategy,and the corresponding system flow chart is given.Finally,the specific experimental waveform is given to verify the effectiveness of the proposed harmonic control strategy.