Input-output decoupling control of induction motors with rotor resistance and load torque identification

An input-output linearizing control for the fifth order induction motor described in the fixed stator frame, along with a simple scheme for rotor resistance and load torque identification is presented in the paper. The rotor resistance and load torque identification algorithm is designed based on steady-state rotor speed and stator currents information, assuming that through the identification phase both unknown parameters are constant. PID controllers are used in both outer control loops. The influence of stator resistance variations on the overall proposed control system performance is analyzed. A simulation study of the proposed control algorithm is presented.