ON-LINE PARAMETERS ESTIMATION OF AN INDUCTION MOTORS
Indirect methods of on-line parameters and variables estimation of induction motors are considered. Relevance of this question is defined by need of improvement of induction motor drives for increase of their efficiency, functional reliability and industrial safety. It is especially actual, for coal-mining industry, where electric drives of the mining equipment work under heavy-load conditions with random loads, frequent overloading and load starts. One of the most preferable directions of improvement of electric drives is use of modern information technologies and computing machinery. Application of estimation methods allows to calculate the current values of induction motor parameters which then can be used in an electric drive control system, also in an subsystems of diagnostics and protection of the electric drive against emergency operation in real time. Possibility of induction motor parameters and variables estimation on the basis of the recursive least squares method, the expanded Kalman filter and a search algorithm is considered. Work of computing algorithms is based on use of induction motor's mathematical model and information containing in the measured currents and stator voltages. Some results of research allowing to recommend the considered methods for practical applications are provided.