Incipient Fault Diagnosis in Ultrareliable Electrical Machines

Davide Barater, Jesus Arellano-Padilla, Chris Gerada

Research output: Journal PublicationArticlepeer-review

15 Citations (Scopus)


Early detection of incipient faults in ac drives is one of the most difficult challenges for condition monitoring, especially for faults related to insulation degradation of the windings. In low power motors, the insulation degradation is principally due to the steep voltage variations caused by the voltage source converters that drive the machines. In the last years, with the coming to market of new no-Si based power devices, which achieve great values of dv/dt, fast tracking of electrical fault has became a topic of primary importance. In this paper, a new method to detect the presence of incipient faults in ultrareliable electric machines is presented and compared with a previous solution. The different methods were extensively evaluated by means of experimental results. It is shown that potential winding faults can be detected at an early stage of fault inception and thus measures can be taken to limit propagation.

Original languageEnglish
Article number7835621
Pages (from-to)2906-2914
Number of pages9
JournalIEEE Transactions on Industry Applications
Issue number3
Publication statusPublished - 1 May 2017


  • DC-AC power converters
  • electric machines
  • electric motors
  • electrical accidents
  • fault detection
  • fault diagnosis
  • motor drives
  • permanent magnet motors
  • pulse-width modulation (PWM) converters
  • variable speed drives

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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