Characterization of Fault signature due to combined air gap eccentricity and rotor faults in induction motors

Bindu, S and Divid, Sumam S and Thomas, Vinod V (2021) Characterization of Fault signature due to combined air gap eccentricity and rotor faults in induction motors. International Review on Modelling and Simulations (I.RE.MO.S.), 14 (5). ISSN 1974-9821

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An accurate means of non-invasive condition monitoring of the popular industrial drive, three-phase squirrel-cage induction motor, can help to avoid unscheduled maintenance downtime and loss. Faults like air-gap eccentricity can exist even in a newly assembled drive and hence may co-exist with other internal defects. Despite it being a possible situation, the occurrence of simultaneous faults has seldom been studied. Therefore, there is a need for identifying fault signatures of combined fault conditions in a non-invasive manner. This paper presents a detailed model-based study on a three-phase squirrel-cage induction motor with the simultaneous existence of broken rotor-bar and air-gap mixed eccentricity faults using spectral analysis of stator current, instantaneous power, and estimated air-gap torque signals. The modelling of the machine is done using the Multiple Coupled Circuit method and modified to model the presence of the combined fault conditions. A comparative evaluation with various fault conditions and their severity is carried out by spectral analysis, and unique slip-dependent frequency components are identified in the spectra of diagnostic signals. This fault characterization is the most significant contribution of this paper.

Item Type: Article
Uncontrolled Keywords: Air-Gap Eccentricity; Broken Rotor-Bar; Condition Monitoring; Air-Gap Torque; Fault Diagnosis; Induction Motors; Instantaneous Power; Motor Current Signature Analysis; Multiple Coupled Circuit Model
Subjects: Engineering > MIT Manipal > Electrical and Electronics
Depositing User: MIT Library
Date Deposited: 03 Mar 2022 08:41
Last Modified: 03 Mar 2022 08:49

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