Reduction of Torque Ripple in Permanent Magnet Synchronous Motor by Harmonic Injection Method
For reaching the goals which by suppression the torque pulsation of permanent magnet synchro-nous motor to improve the stability of the motor operation.Based on the method of multi-software co-simu-lation,an active harmonic injection method of multi-synchronous rotating coordinate system is proposed to improve the stability of permanent magnet synchronous motor.Firstly,the harmonic mathematical model of permanent magnet synchronous motor is established,and the harmonic state equation of each order harmon-ic is perfected.Secondly,based on the related theory of modern control theory,the higher harmonic is ex-tracted and injected by using PI controller to track the current feedback loop of the higher harmonic.Final-ly,the performance of permanent magnet synchronous motor in the whole control system is investigated by u-sing multiple software co-simulation method.The analysis results show that the torque ripple of the PMSM is reduced from 12.8%to 3.3%by feedback and feedforward high order harmonic injection,which shows that the scheme proposed in this paper can achieve the purpose of suppressing the torque ripple of the PMSM.
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