Decreasing the Cogging Torque using Virtual Positive Impedance Based Active Damping Control Method for PMSMs

In this paper, active damping control based virtual positive impedance for a PMSM driver is proposed. The proposed model is assumed to achieve the better motor current with a better harmonic response. 6 switches can be employed in the design of the driver to obtain high performance with a simultaneous reduction in the motor current harmonics and thus the torque ripple of PMSM. However, the reduction of input current harmonics is very important to operate the PMSM with less cogging torque. The proposed concept offers a significant decreasing in harmonics. Thus, the effect of VPI on the cogging torque can be understood. The inverter with a Field Oriented Control (FOC) method operates in 3-phase and 20 kHz switching frequency. The PMSM motor is fed by the inverter. The VPI based active damping control for the motor drive is discussed to confirm the performance of the proposed method. The simulation results based on MATLAB are provided to validate the proposed control strategy.