Monitoring of airgap eccentricity for inverter-fed induction motors based on the differential inductance

Jongman Hong, Doosoo Hyun, Sang Bin Lee, Christian Kral

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

Abstract

Monitoring of airgap eccentricity for induction motors is important for guaranteeing motor reliability, since eccentricity can eventually lead to motor failure due to stator rotor contact. However, there are many limitations to applying existing test methods such as motor current signature analysis (MCSA) in the field, especially for variable frequency applications. In this paper, a new inverter-embedded test approach for detecting eccentricity for induction motors is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped, to extract information on motor eccentricity. The motor is excited with a low frequency pulsating ac field superimposed on different levels of dc fields, and the variation in the differential inductance pattern due to the change in the degree of magnetic saturation caused by eccentricity is observed. An experimental study on a 7.5 Hp induction motor under controlled eccentricity conditions verifies that the sensitivity of eccentricity detection can be significantly improved compared to existing methods.

Original languageEnglish
Title of host publication2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
Pages3000-3007
Number of pages8
DOIs
Publication statusPublished - 2012 Dec 17
Event4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012 - Raleigh, NC, United States
Duration: 2012 Sep 152012 Sep 20

Other

Other4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012
CountryUnited States
CityRaleigh, NC
Period12/9/1512/9/20

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Keywords

  • AC Machine
  • Condition Monitoring
  • Diagnostics
  • Differential Inductance
  • Eccentricity
  • Electrical Fault Detection
  • Induction Motor
  • Inverter

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Hong, J., Hyun, D., Lee, S. B., & Kral, C. (2012). Monitoring of airgap eccentricity for inverter-fed induction motors based on the differential inductance. In 2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012 (pp. 3000-3007). [6342518] https://doi.org/10.1109/ECCE.2012.6342518