This paper proposes an adaptive interconnected observer for sensorless control of a synchronous motor. The corresponding observer is used to estimate the rotor speed, the rotor position, and the load torque and, moreover, to estimate the stator inductance and the stator resistance. The convergence of the observer estimation error is analyzed, and sufficient conditions are given to prove the practical stability. Experimental results are shown to confirm the effectiveness of the proposed method.
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Hamida et al. (2012) studied this question.
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