Robust and adaptive control of induction motors with fuzzy control

The paper deals with a field-oriented control of an asynchronous motor for industrial applications. Although field-oriented control of induction motors is nowadays state of the art, the major problem is still the sensitivity towards parameter variations. In particular the change of rotor resistance due to temperature variations causes undesired results. With this paper, there is introduced a control strategy using robust fuzzy PI-controllers for the cur rent control circuits in combination with a model reference adaptive system in order to solve this problem. The use of fuzzy controllers makes the system less sensitive towards parameter variations at dynamic operation and with the adaptation of the rotor time constant precise torque control can be reached.