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On Sensorless Induction Motor Drives: Sliding-Mode Observer and Output Feedback Controller

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2 Author(s)
Ghanes, M. ; Equipe Commande des Syst., Ecole Nat. Super. de l''Electron. et de ses Applic., Cergy-Pontoise, France ; Gang Zheng

In this paper, a sensorless output feedback controller is designed in order to drive the induction motor (IM) without the use of flux and speed sensors. First, a new sliding-mode observer that uses only the measured stator currents is synthesized to estimate the speed, flux, and load torque. Second, a current-based field-oriented sliding-mode control is developed so as to steer the estimated speed and flux magnitude to the desired references. A stability analysis based on the Lyapunov theory is also presented in order to guarantee the closed-loop stability of the proposed observer-control system. Two experimental results for a 1.5-kW IM are presented and analyzed by taking into account the unobservability phenomena of the sensorless IM.

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Industrial Electronics, IEEE Transactions on  (Volume:56 ,  Issue: 9 )