USING SIMPLIFIED OBSERVERS IN TORQUE CONTROL OF AN INDUCTION MACHINE WITHOUT SPEED SENSOR

Joaquim Monteiro, João Palma, G. D. Marques

Abstract

A method is presented for on-line estimation of internal quantities to be used in the torque control of induction machines without speed sensor. In this paper simplified observers for rotor and stator flux linkages and for the electromechanically converted torque are discussed. These observers are obtained from induction machine dynamic equations and by using currents and voltages as input variables. Numerical results with such observers for rotor and stator flux linkages are shown, for evaluation of capacities and limitations. The quality of such observers, integrated in torque and flux control schemes, is verified by experimental results obtained by digital signal processing with a fast controller on the induction motor drive system.

Keywords

simplified observers, complex observers induction machine, stator and rotor flux linkages

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IMEKO-TC4-2001-125.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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