Unconventional accelerated thermal ageing test for traction electric motors in vehicles

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

Abstract

© 2020 IEEE. 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.

Citation

Lusuardi, L., Cavallini, A., Madonna, V., Giangrande, P., & Galea, M. (2020). Unconventional accelerated thermal ageing test for traction electric motors in vehicles. In Proceedings of the 2020 IEEE Electrical Insulation Conference (EIC) (212-216). https://doi.org/10.1109/EIC47619.2020.9158744

• Conference Name: 2020 IEEE Electrical Insulation Conference (EIC)
• Conference Location: Knoxville, TN, USA
• Start Date: Jun 22, 2020
• End Date: Jul 3, 2020
• Acceptance Date: Nov 22, 2019
• Online Publication Date: Aug 5, 2020
• Publication Date: 2020-06
• Deposit Date: Nov 11, 2020
• Publicly Available Date: Nov 11, 2020
• Pages: 212-216
• Series ISSN: 2576-6791
• Book Title: Proceedings of the 2020 IEEE Electrical Insulation Conference (EIC)
• ISBN: 978-1-7281-5486-2
• DOI: https://doi.org/10.1109/EIC47619.2020.9158744
• Keywords: Insulation, Accelerated aging, Partial discharges, Life estimation, Electric motors, Thermal stresses
• Public URL: https://nottingham-repository.worktribe.com/output/4973981
• Publisher URL: https://ieeexplore.ieee.org/document/9158744
• Additional Information: © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.