Adaptive field-oriented control of induction motor with rotor flux observation

In this paper, an adaptive field-oriented induction motor drive based on the adaptation of the rotor time constant and the observation of the rotor flux linkage is presented. Since the deviation of motor parameters affects the accuracy of field orientation and rotor flux estimation, the adaptation mechanism is utilized to tune the rotor time constant to correct the field-oriented mechanism and the current-model based rotor flux observation. Employing the adaptaive controller on field orientation, the robustness of decoupling control to the variation of rotor time constant can be obtained and the exact observation for the magnitude and the phase angle of the rotor flux can be achieved as well. Finally, some simulation and experimental results are presented to verify its effectiveness.