From the tests, the EDFT seems to identify the faults clearly as can be seen in Fig. 3 and 4. Fig. 3 shows the plotting of spectrum estimation, power spectrum density, and relative frequency resolution. Fig. 4-A shows the plotting of power spectrum estimation between healthy condition and 3 different severities of stator faults. The harmonic A12 (=A21) seem to grow when the number of the short circuit turns increases (around 2.55% for 5 turns short, 6.39% for turns short, 12.15% for turns short compared to healthy condition) while the harmonic A12 of the rotor faults seems to remain (as can be seen in Table 1). The harmonic A12 (=A21) of the power spectrum density and relative frequency resolution for stator faults also increase compared to the healthy condition (as seen in Table 2 and 3).
The power spectrum estimation (Fig. 4-B) is plotted by comparing the results between healthy and broken bar motor. It can be observed that the sideband SA12 (=SA21) has increased when the broken rotor bar happens (around 65.15 %) while the sideband SA12 of the stator faults seem to remain. Additionally, the harmonics of the sideband SA12 (=SA21) of power