A novel direct torque control for permanent magnet synchronous motor drive

To solve the problems of torque ripple and inconstant switch frequency of inverter in the conventional direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drive, a novel DTC method using space vector pulse width modulation (SVM) is proposed based on analysis of PMSM mathematical model. In this novel DTC system of PMSM , traditional torque hysteresis controller and flux hysteresis controller is respectively substituted by PI controller , traditional switch table is substituted by SVM, and traditional PID used for speed controller is substituted by adaptive PID based on artificial neural network . The simulation model of the DTC system of PMSM is built based on MATLAB, simulation results verify the novel system proposed by this paper has faster dynamic response, lower torque ripple and lower flux ripple than traditional system.