Recursive speed and parameter estimation for induction machines

A hierarchical recursive algorithm is presented to estimate the rotor speed and parameters of the induction machine on the basis of measurements of the stator voltages and currents. Due to its recursive structure, this algorithm has the potential to be used for online estimation and adaptive control. The algorithm is designed using two linear regression models derived from the machine electrical equations. These models are valid when there is a time-scale separation between the electrical and mechanical subsystems of the machine. The resulting two-stage estimator has a fast stage which only estimates the rotor speed, and a slow stage in charge of parameter estimation. The performance of the algorithm is illustrated by means of simulations. The results obtained show that this is a promising approach for online speed and parameter estimation.<>