S. Belkacem  , F. Naceri  , R. Abdessemed  , B. Kiyyour  , 
    Performance Analysis of a Speed Sensorless Induction Motor Drive Based on DTC Scheme,
    International Journal of Electrical and Power Engineering,
    Volume 1,Issue 2,
    2007,
    Pages 158-164,
    ISSN 1990-7958,
    ijepe.2007.158.164,
    (https://makhillpublications.co/view-article.php?doi=ijepe.2007.158.164)
    Abstract: This study presents a method for estimation of the stator flux components and rotor speed based on the theory of an adaptive control and a Direct Torque Control (DTC). A linear observer for estimation of the stator flux is synthesized, by using a Lyapunov theory in order to guarantee stability for state estimation. The adaptive observer is associated to a direct torque control of an induction motor. To illustrate the performances and the robustness of this observer, a simulation results is presented.
    Keywords: DTC;adaptive speed and flux observer;regulator design;sensorless control