Detection of airgap eccentricity for induction motors using the single-phase rotation test

Doosoo Hyun, Sungho Lee, Jongman Hong, Sang Bin Lee, Subhasis Nandi

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


The single-phase rotation test (SPRT) is a simple and reliable offline test frequently used for detecting problems in the rotor cage of induction motors without motor disassembly. Airgap eccentricity due to bearing degradation, shaft flexing, etc., is another problem that is difficult to detect, which can cause catastrophic motor failure. In this paper, the feasibility of using the SPRT for detecting eccentricity, which has not been reported before, is investigated. The variation in the inductive component as a function of rotor position and time under static, dynamic, and mixed eccentricity conditions is analyzed. It is shown that airgap eccentricity can be detected in addition to rotor cage problems with the SPRT. An experimental study on a 7.5-Hp induction motor under controlled eccentricity and broken bar conditions shows that airgap eccentricity can be reliably detected with high sensitivity and distinguished from broken rotor bars.

Original languageEnglish
Article number6205361
Pages (from-to)689-696
Number of pages8
JournalIEEE Transactions on Energy Conversion
Issue number3
Publication statusPublished - 2012


  • Condition monitoring
  • eccentricity
  • electrical fault detection
  • inductance measurement
  • induction motors
  • preventive maintenance
  • spectral analysis
  • testing

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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