An inverter-embedded stator winding insulation quality assessment technique for AC machines

Jinkyu Yang, Jintae Cho, Bin Lee Sang, Hosung Jung, Young Park

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

Abstract

The lifetime of the stator winding insulation is reduced when operated with PWM inverters, since insulation degradation is accelerated due to increased thermal and electrical stresses on the motor. This paper focuses on a new approach for monitoring the condition of the stator insulation for failure-prone inverter-fed machines. The main concept of the proposed technique is to apply a variable frequency AC test voltage to the stator insulation using the inverter, to perform standard off-line insulation tests whenever the motor is not operating. This allows the stator insulation to be tested more frequently compared to off-line tests performed once every 3-6 yrs. during periodic maintenance. A method for testing the insulation with minimal modifications to the inverter circuit is proposed and verified experimentally. The results show that the proposed technique provides a simple low cost solution for detecting stator insulation degradation at an early stage for reliable operation of inverter-fed machine systems, since the insulation condition can be monitored frequently. This not only helps prevent forced outages and safety risks due to insulation breakdown, but also helps perform maintenance in an efficient manner since individual motor maintenance can be prioritized and scheduled based on its present condition.

Original languageEnglish
Title of host publicationProceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008
PublisherIEEE Computer Society
Pages143-150
Number of pages8
ISBN (Print)9781424416219
DOIs
Publication statusPublished - 2008
Event2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008 - Beijing, China
Duration: 2008 Apr 212008 Apr 24

Publication series

NameProceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008

Other

Other2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008
CountryChina
CityBeijing
Period08/4/2108/4/24

Keywords

  • AC electric machines
  • Capacitance test
  • Condition monitoring
  • Diagnostics
  • Dissipation factor
  • Insulation resistance
  • Inverters
  • Predictive maintenance
  • Stator insulation

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Safety, Risk, Reliability and Quality

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  • Cite this

    Yang, J., Cho, J., Sang, B. L., Jung, H., & Park, Y. (2008). An inverter-embedded stator winding insulation quality assessment technique for AC machines. In Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008 (pp. 143-150). [4580250] (Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008). IEEE Computer Society. https://doi.org/10.1109/CMD.2008.4580250