Characterization of Fault Signature Due to Combined Air-Gap Eccentricity and Rotor Faults in Induction Motors

S. Bindu, S. Sumam David, Vinod V. Thomas

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Pages (from-to)345-358
Number of pages14
JournalInternational Review on Modelling and Simulations
Issue number5
Publication statusPublished - 2021

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • General Chemical Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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