Robust speed sensorless induction motor drive

A speed sensorless induction motor (IR) drive with robust central character istics is introduced. First, a speed observation system, which is insens;it ive to the variations of motor parameters, is derived on the concept of sli ding mode. Next, an integral-proportional (IP) speed controller using the e stimated speed signal is designed to stabilize the speed loop. Then, to pre serve the robust control performance under parameter variations and externa l load disturbance, an adaptive uncertainty observer with feedforward contr ol is proposed. The adaptive uncertainty observer is Implemented to estimat e the lump of uncertainty of the controlled plant. To increase the accuracy of the estimated values, the speed observation system is implemented using a digital signal processor (DSP) with a high sampling rate.