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Shaft MisalignmentDetectionusing Stator Current Monitoring

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Author(s): Alok Kumar Verma, Somnath Sarangi and M.H. Kolekar

Journal: International Journal of Advanced Computer Research
ISSN 2249-7277

Volume: 3;
Issue: 8;
Start page: 305;
Date: 2013;
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Keywords: Misalignment | Motor current signature analysis | Fault Diagnosis | Induction Motor

ABSTRACT
This paper inspects the misaligned of shaft by usingdiagnostic medium such as current and vibration.Misalignments in machines can cause decrease inefficiency and in the long-run it may cause failurebecause of unnecessary vibration, stress on motor,bearings and short-circuiting in stator and rotorwindings.In this study, authors investigate the onsetof instability on a shaft mounted on journal bearings.Shaft displacement and stator current samples duringmachine run up under misaligned condition aremeasured, analyzed and presented here. Verificationof shaft alignment is done by precision laseralignment kit. Result shows that misalignment is theparameter that is more responsible for the cause ofinstability.
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