Speed identification for vector control of induction motors with voltage decoupling control principle

This paper describes a simplified model of induction motor based on voltage decoupling control principle. We add decoupling terms of input voltage commands of induction motor, namely, add a scalar quantity decoupling tache between excitation and torque signal input port to cancel the inner coupling action of induction motor. According to this model, a speed identification method is presented, which uses t-axis flux to obtain rotor speed estimated value. In addition, a compensatory link of m-axis flux linkage deviation is introduced. The validity of the proposed method is verified by computer simulation and experiment results.