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A rotor flux error-based approach to continuous, adaptive tuning of rotor flux, feedforward field-oriented induction machine drives is presented. The controller is derived from the dq induction machine model. The machine parameter errors upon which slip gain is dependent are computed by estimating the rotor flux error from a nonlinear, open loop, rotor flux observer. This observer is constructed by using stator flux, which is estimated from the terminal information. The approach is presented from three perspectives: field orientation, model reference adaptive control, and feedforward/predictive feedback control. The distinctive properties of this controller are discussed at length. It is shown that this adaptive controller with an indirect field oriented controller provides the advantages of direct and indirect field orientation in one system.>
Hung et al. (Wed,) studied this question.