Speed identification for speed sensorless vector control of induction motors based on voltage decoupling control principle

This paper describes a simplified model of induction motor based on voltage decoupling control principle for speed sensorless vector-controlled induction drive system. The model consists of two subsystems, the rotor flux and torque current subsystems, and is conveniently to solve the problems of voltage coupling. According to this model, a speed identification method is presented for a speed sensorless vector-controlled induction motor drive system, which uses t axis flux to obtain rotor speed. The validity of the proposed method is verified by computer simulation and experiment results.