Perspectives of Innovations, Economics and Business

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Volume 6
Issue 3
Online publication date 2010-10-07
Title Determination of defect in rotor of induction machine by spectral analysis of stator phase current
Author Astrit Bardhi, Ymer Luga, Myrteza Braneshi
Abstract Induction motors are important part of safe and efficient running of any industrial plant. These motors are often used in industrial applications thanks to their usability and their robustness. Faults and failures of induction machine can lead to excessive downtimes processes; generate large losses in revenues and long term maintenance. Early detection of motor abnormalities would help avoiding costly breakdowns. In this paper a diagnostic technique of induction motor broken rotor bars is presented. The applied method is the so-called Motor Current Signature Analysis (MCSA) which utilized the results of spectral analysis of the stator current. The broken rotor bars and rings will cause twice slip frequency side bands around the supplying frequency. The fault detection method consists in monitoring of stator phase current spectrum. Twice slip frequency side bands around the main frequency detected by spectral analysis is an indicator of the broken bars. The experimental results show the efficiency of the method.
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Maliti, K.C., 2000.“Modeling and Analysis of Magnetic Noise in Squirrel-Cage Induction Motors”, Doctoral Dissertation, Royal Institute of Technology, Stockholm 

Sprooten, J., 2007. “Finite Element and Electrical Circuit Modelling of Faulty Induction Machines – Study of Internal Effects and Fault Detection Techniques”, Doctoral Dissertation, Universite Libre de Bruxelles 

Sribovornmonkol, Th., 2006. “Evaluation of Motor on Line Diagnosis by FEM Simulations”, Royal Institute of Technology Stockholm

Tavner, P.J., Penman, J., 2008. “Condition monitoring of Electrical Machine”, Willey & Sons, New York

Thorsen, O. V., Dalva, M., 1999. “Failure identification and analysis for high voltage induction molars in the petrochemical industry”, IEEE Transactions on Industry Applications”

Vas, P., 1993 “Parameter Estimation, Condition Monitoring, and Diagnosis of Electrical Machines”, Oxford University Press

Xhoxhi, N., Luga, Y., 1989. Makinat elektrike 2, SHBLU

Keywords Induction machine, broken bars faults, squirrel cage, harmonics.
Pages 123-130
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