An improved direct torque control method for PMSM

This paper presents an improved direct torque control (DTC) method for permanent magnet synchronous motors. The proposed DTC method generates the diver signal with SVPWM for the fixed switching frequency and low torque ripple relative to conventional hysteresis controllers. Different with the popular SVM-DTC, the proposed method obtains amplitude and angle of reference voltage vector directly by the torque and flux linkage loop respectively without complicated calculations that reproduces the simplicity and robustness of conventional DTC. Furthermore, the observation and control of torque angle in the proposed method ensures the PMSM operating stably. The validity of the control method is verified by experimental tests.