Reliability quantification of induction motors - Accelerated degradation testing approach

Wendai Wang, Dan Dragomir-Daescu

Research output: Contribution to journalConference articlepeer-review

48 Scopus citations


Characterizing life of cheap, highly reliable devices, such as small induction motors, is a challenge due to cost and time restriction. Accelerated degradation testing (ADT) provides a way to predict its life cost- and time-effectively. Having time tracking on degradation signals within relatively short test duration, the reliability can be estimated through accelerated degradation testing, even without any failures. ADT on induction motors have been conducted in the GE R&D Center to quantify the motor reliability. A new degradation index, the Orbit Area, for the induction motors is proposed, which turns out to be one of the most reliable indices for time tracking motor bearing wear. Signal processing method for extracting this degradation index from measured signals was developed. A time-to-degradation model is constructed based on the physics of failure and test observations. Maximum likelihood estimation is employed to analyze test data. The reliability of the motors is finally predicted through the obtained degradation model. Several issues regarding ADT and lessons learned also discussed in the paper.

Original languageEnglish (US)
Pages (from-to)325-331
Number of pages7
JournalProceedings of the Annual Reliability and Maintainability Symposium
StatePublished - Jan 1 2002
EventAnnual Reliability and Maintainability Symposium, The International Symposium on Produc Quality and Integrity - Seattle, WA, United States
Duration: Jan 28 2002Jan 31 2002


  • Accelerated testing
  • Bearing
  • Degradation
  • Life production
  • Reliability prediction

ASJC Scopus subject areas

  • General Engineering
  • Engineering (miscellaneous)


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