Detailed study of the rotor asymmetry effects of induction machine under different supply conditions

This paper presents a detailed study of the rotor asymmetry, caused by broken bars, and their effects on the stator current of an induction machine under different supply conditions. The analytical models dedicated to the rotor faults are often penalized by simplifying assumptions, particularly the distribution of the magnetic flux density in the air-gap. The important information is likely to be omitted partially or completely if one considers only the fundamental of the magnetic flux density. In this study a detailed analysis by finite element method (FEM) of two induction motors in both healthy and faulty cases were presented. Experimental tests corroborate with the simulation results