Binary Observer for Speed Sensorless Control of Induction Motors

초록

The field oriented control methods have been used for design techniques in the variable speed drives of induction motor. This paper describes binary observer which includes the rotor flux and speed estimations for induction motor drives. The sliding observer based on the variable structure control theory has been known to be applied for the method fo the optimal pole assignment to keep an insensitivity of the parameter variations and ensure the stability of the identifier. Sliding observer, however, has a high frequency chattering deteriorating the state estimation performance. To reduce the chattering on the sliding surface in adaptive sliding observer and improve the estimation performance, binary control scheme which has main advantages such as the absence fo high frequency chattering and the finite gains is applied in this paper. Experimental results show the effectiveness of binary observer proposed here for the induction motor drives.