Trajectory of Rotor Resistance for Detecting Broken Rotor Bars of Asynchronous Machines

Abstract

While each industrial sector aims to provide uninterrupted customer service, unplanned shutdowns are undoubtedly undesirable. For this purpose, many studies have been dedicated to fault detection in early stages, to make correct and timely decisions to avoid sudden shutdowns. This paper focuses on detecting broken rotor bar faults in asynchronous motors, industry's dominant machines. A model-based-parameter estimation approach is presented, to detect this fault under variable load conditions. The simulation results demonstrate deviations in the motor’s parameters across different scenarios of broken rotor fault intensity and under varying loads. Moreover, the results imply a linear relationship between the fault’s intensity and rotor resistance variations. Consequently, the approach is not only to detect the presence of the fault, but to also to provide information concerning the fault’s severity.