A new torque direct control scheme of induction machines and its DSP-based implementation

A new torque direct control of induction machines is presented. The space vector modulation (SVM) technique is applied to the voltage source inverter, so that the torque, flux and stator current ripples are reduced. As compared to other SVM-based DTC (direct torque control) methods, stator flux and torque controllers of the new approach are developed on variable structure control theory and don´t use the information of rotor speed. The DSP-based implementation of the scheme is developed in detail. The experimental results show that the system has good dynamic torque response with small ripples