SPEED SENSORLESS CONTROL OF AN INDUCTION MOTOR DRIVE USING EXTENDED KALMAN FILTER

摘要

An extended Kalman filter is applied to estimating state variables of field oriented IM drive control. We need to know precisely the magnitude and angle of the rotor flux space vector for good performance of the field oriented control. An extended Kalman filter algorithm can be used for estimation of the rotor flux and rotor angular speed without using any mechanical sensors. For the estimation it is necessary to monitor only the stator voltage and stator current of the induction motor. The math model of the extended Kalman filter is presented and quality of the estimation is tested in the flux oriented IM drive control.