Induction motor speed estimation using full-order flux observers ensuring system stability

A transparent full-order flux observer design methodology and a model reference adaptive mechanism to estimate the rotor speed of an induction motor are set forth which also ensures system stability in all operability regions. The observer gains are chosen using the Butterworth polynomial and the controller gains of the reference model adaptive speed controller are selected using the concept of the D-decomposition. The overall transfer function between the reference rotor and actual speeds is used to finally determine the controller parameters of the speed loop to enhance the system overall stability in the motoring, regenerative and braking modes of drive operations. The proposed controller and estimator design schemes are validated by computer simulation results for operations in the motoring and regenerating modes