Induction motor DTC strategy using discrete-time sliding mode control

A new algorithm for discrete-time sliding mode torque and flux control is proposed. The induction motor equations are written in a stator flux reference frame. The torque and flux controllers are shown to be robust to errors in the machine parameters. The controllers provide d and q reference voltages to be applied to the induction motor and no current controllers are present. However, differently from most sliding mode techniques, the calculated voltage vector serves as a reference for a vector PWM scheme and a fixed switching frequency is used. Simulation and experimental results are presented to show the strategy effectiveness