Monitoring of Airgap Eccentricity for Inverter-Fed Induction Motors based on the Differential Inductance

Sang Bin Lee (Speaker), Hong Jongman, Christian Kral

Research output: Chapter in Book or Conference ProceedingsConference Proceedings with Oral Presentation

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 publicationProceedings of IEEE Energy Conversion Congress and Exposition, ECCE
Number of pages7
Publication statusPublished - 2012
EventIEEE Energy Conversion Congress and Exposition, ECCE -
Duration: 15 Sept 201220 Sept 2012

Conference

ConferenceIEEE Energy Conversion Congress and Exposition, ECCE
Period15/09/1220/09/12

Research Field

  • Not defined

Keywords

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

Fingerprint

Dive into the research topics of 'Monitoring of Airgap Eccentricity for Inverter-Fed Induction Motors based on the Differential Inductance'. Together they form a unique fingerprint.

Cite this