On the Capability of Heat Dissipation in Thermally Aged Electrical Machines

Madonna, Vincenzo; Giangrande, Paolo; Galea, Michael

Abstract

Thermal aging is one of the main causes of progressive deterioration of the insulation system in electrical machines. This because the thermo-physical properties of dielectric materials can undergo severe changes when exposed to high temperature. Accordingly, thermal aging has a twofold effect, namely, shortening the expected insulation lifetime and influencing the heat transfer / dissipation towards the surrounding. This paper aims at analyzing the second aspect through an in-depth experimental investigation. A case-study motor is thermally modelled with the purpose of quantifying the extent and magnitude of thermal conductivities change, resulting from the insulation thermal aging. As an outcome, it is found that the hot-spot temperature in a thermally-aged machine can be considerably higher than its unaged counterpart, for given operating and boundary conditions.

Citation

Madonna, V., Giangrande, P., & Galea, M. (2020, August). On the Capability of Heat Dissipation in Thermally Aged Electrical Machines. Presented at 2020 International Conference on Electrical Machines (ICEM), Gothenburg, Sweden

• Presentation Conference Type: Edited Proceedings
• Conference Name: 2020 International Conference on Electrical Machines (ICEM)
• Start Date: Aug 23, 2020
• End Date: Aug 26, 2020
• Acceptance Date: May 26, 2020
• Online Publication Date: Dec 1, 2020
• Publication Date: Dec 1, 2020
• Deposit Date: Feb 26, 2021
• Publicly Available Date: Feb 26, 2021
• Publisher: Institute of Electrical and Electronics Engineers
• Pages: 954-960
• Series Title: International Conference on Electrical Machines, ICEM
• Series ISSN: 2381-4802
• Book Title: 2020 International Conference on Electrical Machines (ICEM)
• ISBN: 9781728199467
• DOI: https://doi.org/10.1109/icem49940.2020.9270744
• Keywords: Windings , Insulation , Aging , Temperature measurement , Conductivity , Computational modeling , Stator windings
• Public URL: https://nottingham-repository.worktribe.com/output/5352862
• Publisher URL: https://ieeexplore-ieee-org.ezproxy.nottingham.ac.uk/document/9270744
• 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.