Vibration Analysis And Suppression Of Permanent Magnet Synchronous Motor Based On SVPWM Algorithm Optimization

Permanent-magnet Synchronous motors have the advantages of high power density and good speed control performance.However,SVPWM control will cause high-frequency current harmonics near the carrier and its multiple frequency.Radial electromagnetic force waves are generated in the motor,causing high-frequency vibrations.Because the high-frequency vibration will produce sharp noise,it is of great significance to analyze the SVPWM modulation strategy and optimize the high-frequency vibration.The relationship between SVPWM modulation and high-frequency vibration of the motor was established,and a hybrid suppression strategy based on the traditional suppression strategy was proposed.Firstly,the relationship between SVPWM modulation and high frequency vibration is deduced by analytical method and Maxwell stress equation.Then the random carrier frequency strategy and the random zero vector strategy in the traditional vibration suppression strategy are compared and analyzed.The results show that the random carrier frequency strategy has high frequency vibration suppression capability,but the current distortion rate is high and the torque ripple is large;the random zero vector strategy has low current distortion rate,but the vibration suppression ability at high speed is weak.Based on the above in-depth analysis,a hybrid stochastic suppression strategy was proposed,which analyzed and deduced the vibration suppression principle and the vibration suppression formula.Under different working conditions,the high-frequency vibration suppression performance is optimized,and at the same time,the current distortion rate and torque ripple are minimized.Finally,this thesis takes a 24 V and 60 W three-phase permanent magnet synchronous motor as the research object,the simulation model of the permanent magnet synchronous motor system based on the hybrid stochastic suppression strategy on the Matlab platform was build,and measurement system hardware and software on ARM-Cortex M3 chip was established.The results show that under various operating conditions,the hybrid stochastic suppression strategy can effectively reduce the high-frequency vibration caused by the SVPWM strategy.The vibration acceleration value at the carrier frequency is lower than 0.1716 g,and lower than 0.5g at the double carrier frequency.Compared with the random carrier frequency and the random zero vector strategy,the vibration suppression effect is improved by at least 5.6%.and 28.6%.