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Optimal rotor flux control for induction motors


D. Farruggio, M.A. Müller

vol. AUT97-02

The root loci of induction drives show weakly damped roots for the motor running at low speeds in accelerating mode. Thus, the torque will oscillat e during speed-up. We show in this paper, that the stationary and dynamic behavi or of the motor is improved, if the rotor flux peak is regulated to a constant r eference. Thus, the stator voltage and stator flux peak are decoupled from the t orque. Dynamically, the weakly damped dominant root pair at low speeds is conver ted into a fast and a slow root giving a low pass torque behavior. Two new control laws are presented. The form er controls only the stationary behavior of the rotor flux peak and leaves the d ynamics unchanged. Real measurements show that, whenever enough friction of the appended mechanics is present, this controller is a valuable solution. The latte r is a dynamic extension of the first one and controls the rotor flux peak at all times to a constant reference using an observer based LQR-designed state feedb ack. The root locus of the cont rolled induction drive shows that this controller is a good choice, if mechanics with low friction are used with the motor. Such a result is confirmed by simula tions. The main advantage of both controllers stands in their simplicity and mod est requirements on hardware, i.e. voltage inverter, measurement, computational power. No of pages: 6


Type of Publication:

(04)Technical Report

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% Autogenerated BibTeX entry
@TechReport { FarM_l:1997:IFA_436,
    author={D. Farruggio and M.A. M{\"u}ller},
    title={{Optimal rotor flux control for induction motors}},
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