Abstract
Output feedback control of induction motors has recently been given a great deal of interest. It consists in resorting to observers to avoid mechanical (speed, torque) sensors and make the control system more reliable. The point is that all existing solutions have been developed based on the assumption that the machine magnetic circuit characteristic is linear which is not true in practice, due to magnetic saturation. Ignoring this saturation effect makes it impossible to meet optimal operation conditions in presence of wide range speed and load torque variations. This paper presents an output feedback control design that accounts this saturation effect. The controller includes an interconnected observer, an optimal flux reference generator and a control law obtained using the backstepping design technique. It is shown that the controller regulates well the motor speed and the rotor flux in presence of wide range variations of the machine speed reference and load torque.
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