Mathematical model for electric and mechanical faults in an ac machin

This paper presents a new ac three-phase complete dynamical model undergoes four simultaneous faults for an ac machine. The faults considered are rotor, stator, static eccentricity and bearing faults. The electrical faults are modeled including the parameter variation of resistance and inductance, the mechanical bearing fault modifies the friction element and the eccentricity fault is modeled as a function of mutual inductance. Mapping the stator currents to d-q reference frame and using the Park's instantaneous space phasor and frequency analysis it is possible to isolate the simultaneous faults. Simulation and experimental results validate the proposed model.