An Adaptive Torque Ripple Suppression Algorithm for Permanent Magnet Synchronous Motor Considering the Influence of a Transmission System.

Background: The existing torque ripple suppression algorithms of permanent magnet synchronous motor (PMSM) do not consider the vehicle transmission system model, and cannot satisfy the torque ripple suppression in different working modes of the PMSM. Purpose: To deal with the resonance problem of hybrid electric vehicle (HEV), which caused by the torque ripple of PMSM under different working modes. Methods: An adaptive torque ripple suppression (ATRS) algorithm of the PMSM considering the influence of the transmission system is proposed in this study, the torque ripple characteristics of the motor control system, which influenced by the transmission system in the vehicle environment, can be well revealed. The ATRS algorithm adopts fuzzy quasi proportional resonant (FQPR) controller in parallel with slide Fourier feedback (SDFF) control, which reduces the number of parameters needs to be determined in practical application. The ATRS algorithm designs the FQPR controller to realise the adaptive adjustment of the parameters and track the specific frequency resonant signal, and uses the SDFF control to simplify the computation of calculating the feedforward harmonic compensation voltage, which ensures the accuracy, robustness and efficiency of the algorithm. Results: The control effect of the ATRS algorithm is analysed in the time domain and the frequency domain through simulation, and the improvement of the torsional vibration response of the transmission system before and after applying the algorithm at the pure electric mode resonant speed is analysed. The simulation results show that the torque ripple amplitude decreases 47.37% after applying the algorithm, and the proposed ATRS algorithm has a good control effect on the improvement of the steady torsional vibration response of the transmission system. Conclusions: The algorithm proposed in this paper can effectively reduce the harmonic current and suppress the torque ripple of the PMSM. At the same time, the transmission torque amplitude of the transmission system at the resonant harmonic frequency can be greatly reduced, which verifies the effectiveness of the torque fluctuation suppression algorithm proposed in this paper. [ABSTRACT FROM AUTHOR]