Petroleum Pumps’ Current and Vibration Signatures Analysis Using Wavelet Coherence Technique

Figure 3

Frequency spectra of current and vibration signatures.

(a) Healthy motor with symmetrical supply voltages (current) 

(b) Healthy motor with symmetrical supply voltages (vibration)

(c) One-phase supply voltage with 20 volts drop (current)

(d) One-phase supply voltage with 20 volts drop (vibration)