Multiple-Fault Detection Methodology Based on Vibration and Current Analysis Applied to Bearings in Induction Motors and Gearboxes on the Kinematic Chain

Figure 7

Vibration spectra of the experiment with VFD set to 5 Hz.

(a) Healthy condition

(b) Bearing defect

(c) 75% of uniform wear

(d) 75% of uniform wear + bearing defect