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This paper proposes a method f o r designiny a robustfull-older observer f o r vector-controlled induction motors takiny core loss into account. Although most of the literature focuses o n parameter identification, the global stability of the identification remains questionable. There is therefore a need f o r robustness with respect to some parameters. This paper describes the design of a robust full-order observer which takes core loss into account, using both guan-scheduled H , control and the linear matrix inequality (LMI) technique. This design always results in a stable controller. The robustness of the proposed method with regard to variation in certain resistance parameters is evaluated b y means of experimental results.

Bandwidth limitation hinders the economical and broad application of induction motors promised by speed sensorless drive. This paper proposes an integrated control and observer design for speed sensorless control of induction motors with stator voltage and current measurements. With a general observer structure, the backstepping-based robust control design explicitly considers the errors of both the state estimation and tracking, and thus avoids the commonly used time scale separation. The gain selection for the controller becomes easy and straightforward. As a case study, the extended Kalman filter is used as a state estimator in order to simplify the gain tuning process. Simulation results validate the effectiveness of proposed method.