A robust induction motor servo drive

A position controller, considering the effects of system dead-time and parameter variations, for induction motor servo drives is proposed in this paper. First a DSP-based computer controller indirect field-oriented induction motor servo drive is implemented and its dynamic model at the nominal case is estimated from measurements. Based on this model, an integral plus proportional (IP) controller is quantitatively designed to match the prescribed position tracking specifications. Then a dead-time compensator (DTC) and a simple robust controller (RC) are designed and augmented to reduce the effects of system dead-time on the stability and the performance degradation due to parameter variations. The prescribed drive tracking specifications can be preserved under parameter variations. Rather good load regulating response can also be obtained. Some experimental results are provided to demonstrate the effectiveness of the proposed controllers.