Evaluation of the Influence of Rotor Magnetic Anisotropy on Condition Monitoring of Two-Pole Induction Motors

Sungsik Shin, Jongwan Kim, Sang Bin Lee, Chaewoong Lim, Ernesto J. Wiedenbrug

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


If nongrain-oriented rotor laminations are punched and stacked in a uniform direction, magnetic asymmetry is present in the rotor core due to the nonideal magnetic anisotropy. In this paper, it is shown that the influence of rotor core anisotropy can be misinterpreted as rotor faults in two-pole induction motors when performing motor current signature analysis. A detailed analysis of the influence of rotor core anisotropy shows that components produced by the rotor fault and rotor anisotropy interact, making reliable fault detection difficult. It is also shown that offline testing is currently the only available means of detecting the fault, and online monitoring of the space harmonics-induced current components is proposed as a viable solution for providing reliable rotor fault detection for two-pole motors with rotor anisotropy. The analysis and conclusions presented in this paper are verified through testing on custom-built lab motors and on 3.3-kV motors.

Original languageEnglish
Article number07008513
Pages (from-to)2896-2904
Number of pages9
JournalIEEE Transactions on Industry Applications
Issue number4
Publication statusPublished - 2015 Jul 1

Bibliographical note

Publisher Copyright:
© 2015 IEEE.


  • AC machines
  • Motor Current Signature Analysis (MCSA)
  • false alarm
  • fault diagnosis
  • frequency domain analysis
  • induction motors
  • predictive maintenance
  • rotor fault

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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