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

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, November). Impact of thermal overload on the insulation aging in short duty cycle motors for aerospace. Presented at 5th International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles (ESARS) and International Transportation Electrification Conference (ITECH), Nottingham, UK

• Presentation Conference Type: Edited Proceedings
• Conference Name: 5th International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles (ESARS) and International Transportation Electrification Conference (ITECH)
• 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/
• Contract Date: Oct 26, 2018