An Investigation on SMC-DTC Technique Using SVM for PMSM Drive

This paper investigates the direct torque control (DTC) of permanent magnet synchronous motor (PMSM) drives. Due to high efficiency and power density, PMSMs are finding many industrial applications, including hybrid EVs. A direct torque control technique with PI and SMC, incorporating a space vector pulse width modulated (SVPWM) inverter for flux and torque ripple reduction in PMSM drive is demonstrated in this study. The analysis depicts the rise of electromagnetic torque with the increment in the angle between the rotor and stator flux linkages. Therefore, a rapid response for the torque is achieved by expanding the stator flux linkage's rotating speed. A hysteresis comparator of two-level and three-level controls the stator flux and electromagnetic torque under this DTC technique. An SMC-based controller is designed to maintain the increment of motor speed and torque angle to enhance dynamic reaction time and boost robustness during loading and motor parameter variation. The sliding mode controller features good static and dynamic response, reduces the motor's speed drop and disturbance rejection, and improves the robustness of PMSMs, operated under different speeds and with varied loads. The simulation results verified the viability of the SMC-DTC approach.