Abstract
This paper presents a new technique of implementing the back-EMF MRAS speed observer used in sensorless vector control systems with induction motors. The adjustable model of the speed observer is made on the basis of the estimated d-q components of the back electromotive forces (Back-EMF) using in this sense the afferent components the space vector of the rotor flux, obtained on the basis of the reduced order Gopinath observer. The testing and evaluation of the dynamic performances of the speed and rotor flux observers are by numerical simulation in Matlab-Simulink performed.
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