The instantaneous power factor approach for rotor cage faults diagnosis in three-phase induction motors

In this paper a new fault detection technique based on the instantaneous power factor signature analysis is proposed for the diagnosis of rotor cage faults in three-phase induction motors. A mathematical model based on the Winding Function Approach was used for the simulation of this type of fault and experimental tests were carried out on an induction motor with several faulty rotors. Both simulation and experimental results are presented to illustrate the effectiveness of the proposed approach. A suitable fault severity factor is also proposed as an indicator of the machine condition.