CONTROL OF INDIRECT FIELD-ORIENTED INDUCTION-MOTOR DRIVES CONSIDERINGTHE EFFECTS OF DEAD-TIME AND PARAMETER VARIATIONS

In this paper, a speed controller considering the effects of system de ad time and parameter variations for indirect field-oriented induction motor drives is presented. First, an indirect field-oriented inductio n motor drive is implemented, and its dynamic model is found based on the stochastic approach. Second, a two-degree-of-freedom speed control ler is designed to match the prescribed speed command tracking and loa d regulating specifications. Since the performances of the closed-loop controlled plant are much influenced by the presence of the inherent system dead-time and parameter variations during wide-range operations , a dead-time compensator and a model following controller are propose d to enhance the robustness of the two-degree-of-freedom speed control ler. The simulated and experimental results show that good control per formances both in speed command tracking and load regulating character istics are achieved.