Unconventional accelerated thermal ageing test for traction electric motors in vehicles

Luca Lusuardi, Andrea Cavallini, Vincenzo Madonna, Paolo Giangrande, Michael Galea

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review


Car manufacturers are increasingly working to make the all-electric car a reliable and affordable mobility option for a larger section of the population. However, several issues need to be addressed before achieving this goal. One of the problems is represented by the qualification of the insulation systems employed in electric motors. Unfortunately, the tests to be performed are time consuming and the design of such measurements very often is done by trial and error, further lengthening the validation phase. In addition, since cars are exposed to variable torque and speed operations (especially when driven in city traffic), the stator winding temperature is expected to vary in a wide range. Nevertheless, indications regarding the impact that highly variable temperature conditions play on the insulation reliability are not available, at the moment. In this work, the results of accelerated thermal aging tests using temperature profiles (i.e. variable temperature ageing) are presented and discussed. The experiments are accomplished on simplified insulation systems for electric motor (i.e. specimens) and cycling temperature profiles, ranging between 200°C - 260°C and featuring different thermal gradients, are applied as ageing stress. Finally, the possibility of relying on statistical techniques for improving the quality of prediction, while shortening the testing time, is explored.

Original languageEnglish
Title of host publication2020 IEEE Electrical Insulation Conference, EIC 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)9781728154855
Publication statusPublished - Jun 2020
Event2020 IEEE Electrical Insulation Conference, EIC 2020 - Knoxville, United States
Duration: 22 Jun 20203 Jul 2020

Publication series

Name2020 IEEE Electrical Insulation Conference, EIC 2020


Conference2020 IEEE Electrical Insulation Conference, EIC 2020
Country/TerritoryUnited States


  • Accelerated thermal test
  • Insulation ageing
  • Low-voltage motors
  • More Electric Aircraft
  • More Electric Vehicle
  • Partial Discharges
  • Temperature Index
  • Thermal transient

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Safety, Risk, Reliability and Quality
  • Electronic, Optical and Magnetic Materials


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