Automated monitoring of airgap eccentricity for inverter-fed induction motors under standstill conditions

Doosoo Hyun, Jongman Hong, Sang Bin Lee, Kwonhee Kim, Ernesto J. Wiedenbrug, Mike Teska, Subhasis Nandi, Ilamparithi T. Chelvan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

There are many limitations to applying on-line spectrum analysis techniques for diagnosis of closed loop inverter-fed induction motors due to variable load or frequency operation, and the masking effect of the current regulator. In this paper, a new automated approach for testing inverter-fed induction machines for airgap eccentricity is proposed. The main concept is to use the inverter to excite the machine with a pulsating field at multiple angular positions to observe the variation of equivalent impedance due to eccentricity, whenever the motor is stopped. It is shown that the increase in the value of the equivalent (leakage) inductance under standstill excitation can be used as an indicator of increasing airgap eccentricity. Standstill testing can provide reliable assessment of eccentricity that is independent of variations in operating conditions, load interferences, or motor type. An experimental study on a 7.5hp induction motor verifies that eccentricity can be detected with high sensitivity and reliability without additional hardware.

Original languageEnglish
Title of host publication2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings
Pages2485-2492
Number of pages8
DOIs
Publication statusPublished - 2010
Event2010 2nd IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Atlanta, GA, United States
Duration: 2010 Sep 122010 Sep 16

Publication series

Name2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings

Other

Other2010 2nd IEEE Energy Conversion Congress and Exposition, ECCE 2010
CountryUnited States
CityAtlanta, GA
Period10/9/1210/9/16

Keywords

  • AC machine
  • Airgap eccentricity
  • Condition monitoring
  • Diagnostics
  • Induction motors
  • Inverters
  • Off-line testing
  • Spectrum analysis

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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  • Cite this

    Hyun, D., Hong, J., Lee, S. B., Kim, K., Wiedenbrug, E. J., Teska, M., Nandi, S., & Chelvan, I. T. (2010). Automated monitoring of airgap eccentricity for inverter-fed induction motors under standstill conditions. In 2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings (pp. 2485-2492). [5617947] (2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings). https://doi.org/10.1109/ECCE.2010.5617947