Motor current acts as an excellent transducer for detecting faults in the motor. Spectrum analysis of the motor’s current & voltage signals can hence detect various faults without disturbing its operation. Typical faults detectable by this are Rotor bar damage, misalignment/unbalance, foundation looseness, static & dynamic eccentricity, core damage, loose wedges, inter-turn shorts, defective bearings.
Electrical signature analysis is the procedure of acquiring the motor current and voltage signals, performing signal conditioning and analyzing the derived signals to identify the various faults. The three phase signals are collected either directly or through CT.