Airgap flux based detection and classification of induction motor rotor and load defects during the starting transient

Yonghyun Park, Hanchun Choi, Jaehoon Shin, Jongsan Park, Sang Bin Lee, Hyunsik Jo

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


There has been active research on motor current signature analysis (MCSA) for over the last 30+ years, as it can provide remote monitoring of rotor and load defects using the current sensor available in the motor control center. However, many years of experience has shown that 1) rotor eccentricity and load defects cannot be distinguished and 2) false rotor cage fault indications are common in the field. There is a recent trend toward integrating 'smart' self-diagnostics in electric machines through embedded sensors, especially in applications such as submersible pumps or nuclear plants where motor inspection is difficult. The objective of this article is to evaluate airgap flux measurement as an option for providing sensitive and reliable monitoring of motor and load defects. A new method based on the analysis of the airgap flux search coil voltage during motor starting is proposed for reliable detection and classification of rotor cage, eccentricity, and mechanical defects in the load. Experimental testing is provided to verify the claims made on the proposed method, for cases where MCSA fails.

Original languageEnglish
Article number8948307
Pages (from-to)10075-10084
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number12
Publication statusPublished - 2020 Dec

Bibliographical note

Funding Information:
Manuscript received August 10, 2019; revised October 13, 2019 and November 1, 2019; accepted November 22, 2019. Date of publication January 1, 2020; date of current version August 18, 2020.This work was supported by the National Research Foundation of Korea grant funded by the Korea government under Grant NRF-2019R1A2C1084104. (Corresponding author: Sang Bin Lee.) Y. Park, H. Choi, J. Shin, J. Park, and S. B. Lee are with the Department of Electrical Engineering, Korea University, Seoul 02841, Korea (e-mail:;;;;

Publisher Copyright:
© 1982-2012 IEEE.


  • Airgap eccentricity
  • airgap flux
  • fault diagnosis
  • induction motor
  • load unbalance
  • misalignment
  • motor current signature analysis (MCSA)
  • rotor cage fault
  • search coil
  • spectral analysis

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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