Low-order harmonic components that appear in the line voltage of inverters supplying induction motors can provide additional information on the fault of induction machines. This was illustrated very clearly by Akin et al. [52] for bearing, eccentricity, and broken rotor bar faults. The fault frequencies to
TABLE 6.3
Experimental, Normalized Amplitude of Eccentricity-Related Harmonics Arising out of Pole Pair Matching
Amplitude of Eccentricity-Related Harmonics for Inclined Condition Load Level 50%, 50% 45.78%, 65.06% Healthy 50%, –50% 0% –49.26 dB –50.74 dB –61.01 dB –62.7 dB 25% –48.97 dB –49.55 dB –64.6 dB –61.08dB 50% –47.22 dB –48.27 dB –63.8 dB –61.24 dB 75% –46.9 dB –47.38 dB –62.42 dB –61.7 dB 100% –46.88 dB –47.28 dB –62.04 dB –61.9 dB TABLE 6.4
Experimental, Normalized Amplitude of Eccentricity-Related Harmonics Arising out of Asymmetry
Amplitude of Asymmetry-Related Harmonics for Inclined Condition Load Level 50%, 50% 45.78%, 65.06% Healthy 50%, –50% 0% –51.3 dB –52.2 dB –55.94 dB –57.45 dB 25% –53.7 dB –55.4 dB –56.54 dB –56.6 dB 50% –55.2 dB –58.9 dB –59.4 dB –58.55 dB 75% –55.9 dB –57.38 dB –59.6 dB –59.2 dB 100% –55.8 dB –57.28 dB –60.2 dB –59.25 dB
be detected can be simply derived by replacing the fundamental frequency with these harmonics in the equations describing these frequencies. For example, if Equation (6.63) is to be used for these low frequency spectra for a harmonic of order h, then it is to rewritten as
= ± = =
fecc2 [hfs kf hr], 1, 3, 5,7...k 1, 2, 3,... (6.72) where fs is the fundamental supply harmonic. Figure 6.36 illustrates the concept.
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