Decoupling control of induction motors with motor parameter identification

In this paper, the authors attempt to control induction motors with high dynamic performance by means of decoupling of motor speed and rotor flux. For power efficiency control or field weakening, the rotor flux may be reduced at light loads. Motor inductances depend on rotor flux but not on machine temperature. So, if the rotor flux is to be changed for power efficiency control or field weakening, the motor inductances should be changed according to the rotor flux commands. On the other hand, rotor resistance varies greatly with the machine temperature. The authors present novel identification algorithms for motor inductances and rotor resistance. Their identification algorithms are computationally simple and have very small identification errors. To demonstrate the practical significance of their results, they present some simulation results as well as mathematical analysis