The radial flux density in the air gap for the healthy and
faulty Induction motor with their harmonics are calculated by
FEM and shown in Fig. 9. It can be observed that flux density
and vector potential of the machine with broken rotor fault
becomes less sinusoidal and unsymmetrical. The magnitude of
flux density harmonics magnify in the machine with broken
bar fault. The harmonics of magnetic flux are more visible in
the vector potential variable. Thus, the vector potential over air
gap is obtained by FEM. Fig. 10 shows the calculated vector
potential and its harmonic.