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In this paper, an adaptive flux observer is designed for a speed sensorless direct torque controlled induction motor drive in which the rotor resistance value is updating during operation and a new speed-adaptive law is given. By using robust control theory, the constant observer gain is obtained by solving two bilinear matrix inequalities. The stability of the flux observer is ensured in a sufficiently...
This paper presents a new adaptive flux observer with a constant gain for speed identification. The theory of Lyapunov stability is used to design adaptive flux observer and speed estimator. The stability of flux observer is gauranteed by a linear matrix inequality (LMI), and the constant observer gain is obtained by solving the LMI with LMI toolbox in MATLAB. The problem of unstable region which...
This paper designs a full-order adaptive observer and proposes adaptive identification laws for speed and stator resistance based on the proposed observer. By using the theory of Lyapunov stability, the gain of the observer can be obtained by solving two bilinear matrix inequalities using the LMI toolbox of MATLAB, which solves the problem of the unstable region in theory and the inaccurate estimation...
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