Estimating the parameters of an induction motor in open-loop and closed-loop operation

The purpose of this paper is to present two methods for estimating all the parameters of induction motors operating in open-loop or in closed-loop. The parameters are obtained by solving a recursive least squares minimization problem. The estimation procedure is performed in two parts. First, the stator leakage inductance and the stator resistance are determined by using the homopolar machine model. Then, given the previously estimated homopolar parameters and by using the dynamic dq model, all the other parameters are determined. The first method is derived for open-loop operation. In the second method, the model is derived for the case where the stator currents of the motor are regulated via a linear feedback controller. Selected experimental results are used to demonstrate the feasibility and performance of the proposed methods.