Abstract
In this paper the use of non-linear kalman filters to estimate the rotor speed of an induction motor drive is studied in detail. The general structure of the extended Kalman filter (EKF), unscented kalman filter (UKF) and cubature kalman filter (CKF) is reviewed, and the various system vectors and matrices are defined. By including the rotor speed as a state variable, these non-linear kalman filter equations are established from a discrete two-axis model of the three-phase induction motor. Using MATLAB/Simulink, simulation of the speed estimation algorithm is carried out for an induction motor with Space Vector Modulation (SVM) drive. The experimental results obtained are compared for feasibility and performance, and it is observed that CKF is the most accurate among the three kalman filters even during parameter changes due to motor temperature and speed variations.
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