Case stories of advanced rotor assessment in field motors operated with soft-starters and frequency converters

J. Antonino-Daviu, J. Corral-Hernandez, Vicente Climente-Alarcón, H. Razik

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

5 Citations (Scopus)

Abstract

Advanced analysis of the motor starting currents enables very reliable diagnostics of the rotor condition, providing immunity against the eventual false alarms obtained with the conventional MCSA. However, the application of this methodology has been mainly restricted to the case of line-started machines. Its extension to the cases of soft-started or inverted-fed motors has been barely investigated, especially because the probability of rotor damage is claimed to be reduced under such conditions. Nonetheless, industrial cases related to rotor damages in induction motors operated via soft-starters and frequency-converters have been recently reported. This paper proposes a twofold transient-based approach for the reliable assessment of the rotor condition in induction motors operated with such elements. The method relies on the advanced analysis of the motor starting current by combining two types of time-frequency approaches (based on discrete and continuous transforms) in two subsequent stages: 1) fault pattern identification and 2) fault severity quantification. Field results obtained with large motors operating in a sewage treatment plant confirm the validity of the methodology for the rotor assessment in induction motors operated both via soft-starters and frequency converters.

Original languageEnglish
Title of host publicationIECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society
PublisherIEEE
Pages1139-1144
Number of pages6
ISBN (Print)9781479917624
DOIs
Publication statusPublished - 25 Jan 2016
MoE publication typeA4 Article in a conference publication
EventAnnual Conference of the IEEE Industrial Electronics Society - Yokohama, Japan
Duration: 9 Nov 201512 Nov 2015
Conference number: 41

Conference

ConferenceAnnual Conference of the IEEE Industrial Electronics Society
Abbreviated titleIECON
CountryJapan
CityYokohama
Period09/11/201512/11/2015

Keywords

  • fault diagnosis
  • frequency converters
  • induction motors
  • rotor
  • soft-starters
  • transient analysis
  • wavelet

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