Abstract: The minimization of speed ripple of the permanent magnet synchronous motors (PMSM) in low speed range becomes a major problem while applying the PMSM to refrigerant system. In conventional methods, an iterative learning controller is applied in conjunction with the conventional proportional integral (PI) speed controller to minimize the speed ripple. In this paper a frequency variable resonance controller is applied with the conventional proportional integral speed controller as a PI-RES controller, which provides the reference torque current. The main reference current generated by the PI controller together with the compensation torque current generated by the resonant controller is used to minimize speed ripple. The proposed method is verified through simulation results.
Keywords: Permanent Magnet Synchronous Motor, PI-RES controller, Field Oriented Control