Modeling of Sensorless Determination of the Resistance and Temperature of the Stator and Rotor Windings of an Asynchronous Motor

Abstract

A brief survey of the existing sensorless methods of determination of the temperature of the stator and rotor windings of the asynchronous motors (AMs) is given. It is stated that one of such methods is indirect determination of the temperature by measuring the active resistance of the AM windings. on the AM equivalent circuit, the possibility of determining the resistance by introducing the additional components of the stator winding voltage is theoretically justified. The conditions for the correct determination of the parameters when introducing the ac voltage component are stated. The features of the AM mathematical model and method of modeling of determination of the winding resistance in the Matlab packet are studied. The results of modeling determination of the stator winding resistance by introducing the direct voltage component and rotor winding resistance by introducing direct and high-frequency voltage components are presented. The influence of the introduced voltages on the electromechanical coordinates of the electric drive is analyzed. Proposals on selection of the frequency of the ac voltage component are given. An estimation of feasibility of the suggested method in modern electric drive control systems is made.