Shaft MisalignmentDetectionusing Stator Current Monitoring

This paper inspects the misaligned of shaft by using diagnostic medium such as current and vibration. Misalignments in machines can cause decrease in ef ficiency and in the long - run it may cause failure because of unnecessary vibration, stress on motor, bearings and short - circuiting in stator and rotor windings. In this study, authors investigate the onset of instability on a shaft mounted on journal beari ngs. Shaft displacement and stator current samples during machine run up under misaligned condition are measured, analyzed and presented here. Verification of shaft alignment is done by precision laser alignment kit. Result shows that misalignment is the p arameter that is more responsible for the cause of instability.