Thermal degradation profile mapping in stator coil insulation by impedance spectroscopy

Abstract

Impedance spectroscopy is one of the continuously developing tools deployed for the inspection and evaluation of the health condition of electrical machines and machine components. Being a practical implementation and expansion of the Broadband Dielectric Spectroscopy (BDS) and the Electrochemical Impedance Spectroscopy (EIS), it allows the characterization of components by their amplitude and phase responses over frequency and the system's resonances. To this direction, this paper presents a study on the effect of thermal degradation on the insulation system of concentrated stator coils from the stator winding of a 2 MW permanent magnet synchronous generator purposed for aerospace applications. The thermal aging pattern and degradation mechanisms of the coil insulation are discussed through experimental results by ex-situ impedance spectroscopy.

Metadata

Item Type:	Article
Authors/Creators:	Stone, E.J.W. https://orcid.org/0009-0007-4795-9939 Panagiotou, P.A. https://orcid.org/0000-0001-5889-4412 Mühlthaler, J. Reeh, A. Lambourne, A. Jewell, G.W. https://orcid.org/0000-0002-8763-4190
Copyright, Publisher and Additional Information:	© 2025 The Authors. Except as otherwise noted, this author-accepted version of a journal article published in IEEE Transactions on Industry Applications is made available via the University of Sheffield Research Publications and Copyright Policy under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/
Keywords:	impedance spectroscopy; insulation degradation; stator coil inspection
Dates:	Published (online): 24 February 2025 Published: 24 February 2025
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > School of Electrical and Electronic Engineering
Funding Information:	Funder Grant number INNOVATE UK 51689
Depositing User:	Symplectic Sheffield
Date Deposited:	13 May 2025 14:08
Last Modified:	13 May 2025 14:08
Status:	Published online
Publisher:	Institute of Electrical and Electronics Engineers (IEEE)
Refereed:	Yes
Identification Number:	10.1109/tia.2025.3544562
Sustainable Development Goals:
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:226620

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Thermal degradation profile mapping in stator coil insulation by impedance spectroscopy

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