Rotor Cage Fault Diagnostics in Three-Phase Induction Motors, by the Instantaneous Non-Active Power Signature Analysis

In this paper a new detection technique based on the instantaneous non-active power signature analysis is proposed for the diagnosis of rotor cage faults in operating three-phase induction motors. For that purpose, a mathematical model based on the winding function approach is used in order to simulate this type of fault and experimental tests are carried out on an induction motor with several faulty rotors. Simulation and experimental results are presented to show the merits of this novel approach for the detection of cage induction motors broken rotor bars.