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Impact of thermal overload on the insulation aging in short duty cycle motors for aerospace

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

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Authors

Vincenzo Madonna

Paolo Giangrande

Luca Lusuardi

Andrea Cavallini

MICHAEL GALEA Michael.Galea@nottingham.ac.uk
Professor of Electrical Machines and Drives



Abstract

Electric motors for aerospace applications are often characterised by short-time duty rather than continuous-duty operations. Some of the main requirements for these machines are high torque density and reliability. Considerable torque density improvement can be achieved by supplying the windings with current greater than the rated value and thus thermally overloading the machine for short periods of time. However, if the insulation is overheated, the machine lifetime is shortened, and reliability issues can arise. This paper experimentally investigates the influence of short-time thermal overload on the insulation lifetime of low voltage, random wound electrical machines. The analysis is performed on round enamelled magnet wires coils aged by accelerated thermal cycles, and the results are statistically processed by the two-parameter Weibull distribution. The experimental data is also used for building a lifetime estimation model, which is employed for predicting the lifetime of a motor embedded into an electromechanical actuator for landing gear extension/retraction.

Citation

Madonna, V., Giangrande, P., Lusuardi, L., Cavallini, A., & Galea, M. (2018). Impact of thermal overload on the insulation aging in short duty cycle motors for aerospace. In 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC) (1-6). https://doi.org/10.1109/ESARS-ITEC.2018.8607539

Conference Name 5th International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles (ESARS) and International Transportation Electrification Conference (ITECH)
Conference Location Nottingham, UK
Start Date Nov 7, 2018
End Date Nov 9, 2018
Acceptance Date Jul 26, 2018
Online Publication Date Jan 14, 2019
Publication Date 2018-11
Deposit Date Oct 26, 2018
Publicly Available Date Oct 26, 2018
Pages 1-6
Book Title 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC)
ISBN 978-1-5386-4193-4
DOI https://doi.org/10.1109/ESARS-ITEC.2018.8607539
Keywords More; Electric; Aircraft; Electromechanical; actuators, reliability, insulation, PMSM, Lifetime model
Public URL https://nottingham-repository.worktribe.com/output/1194949
Publisher URL https://ieeexplore.ieee.org/document/8607539
Related Public URLs http://www.esars.eu/wp2018/

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