00000cab a22000003a 4500 UP-99796217609532860 Buklod 20231007234345.0 m |o d | ta 101109s xx d | ||r ||||| || DENGII eng Rong-Jong Wai Hybrid control for speed sensorless induction motor drive. pp. 116-138 The dynamic response of a hybrid-controlled speed sensorless induction motor (IM) drive is introduced. First, an adaptive observation system, which comprises speed and flux observers, is derived on the basis of model reference adaptive system (MRAS) theory. The speed observation system is implemented using a digital signal processor (DSP) with a high sampling rate to make it possible to achieve good dynamics. Next, based on the principle of computed torque control, a computed torque controller using the estimated speed signal is developed. Moreover, to relax the requirement of the lumped uncertainty in the design of a computed torque controller, a recurrent fuzzy neural network (RFNN) uncertainty observer is utilized to adapt the lumped uncertainty online. Furthermore, based on Lyapunov stability a hybrid control system, which combines the computed torque controller, the RFNN uncertainty observer and a compensated controller, is proposed to control the rotor speed of the sensorless IM drive. The computed torque controller with RFNN uncertainty observer is the main tracking controller and the compensated controller is designed to compensate the minimum approximation error of the uncertainty observer instead of increasing the rules of the RFNN. Finally, the effectiveness of the proposed observation and control systems is verified by simulated and experimental results Lyapunov stability. Adaptive observation system. Compensated controller. Computed torque control. Dynamic response. Flux observer. Hybrid control. Lumped uncertainty. Minimum approximation error. Model reference adaptive system theory. Recurrent fuzzy neural network uncertainty observer. Rotor speed control. Speed observer. Speed sensorless induction motor drive. Tracking controller. IEEE Transactions on fuzzy systems 9, 1 (2001). FO UPD DENG-II Article