Vector Control Of Synchronous Reluctance Motor With Reduced Torque Ripples

Abstract

High torque ripples associated with direct torque control (DTC) of synchronous reluctance motor (SynRM) have become a severe challenge in high-performance applications. This paper proposes a modified method to suppress the torque ripple for a vector controlled SynRM drive system. The switching-table based DTC is opted to control the motor. The method exploits the decoupled currents in the synchronous reference frame in order to generate a more accurate set of inputs for the switching table. In addition, the active voltage application time is regulated to avoid high torque ripples. The method reduced the high torque ripples of the SynRM by simply using hysteresis controllers and switching table with different inputs. Moreover, the pulse-width modulation algorithm is avoided, resulting in less computation burden of the control. The simulation results are carried out and the performance of the method is validated.