ADAPTIVE-CONTROL OF INDUCTION-MOTORS WITHOUT FLUX MEASUREMENTS

We present a new adaptive control technique for induction motors. We f irst treat certain signals in the system as fictitious control signals to a simpler subsystem. An adaptive technique is used in this stage t o design the fictitious controllers. Then we apply the sliding mode me thod to robustly realize the fictitious adaptive signals. The method i s robust to parameter variations, and the stability analysis is simple . Another advantage of our method is that we only require a reduced-or der system to be linearly parameterizable (LP); the rest of the system dynamics can be highly nonlinear, with no LP requirement. Full state feedback is not needed for implementation. In particular, the rotor fl ux measurement is not needed. Load torque and rotor resistance can be unknown but bounded. Copyright (C) 1966 Elsevier Science Ltd.