Impact of Soft Magnetic Ageing on the Performance of Aerospace Propulsion Machines

Ram Kumar Ramanathan Mathavan Jeyabalan, Gaurang Vakil, David Gerada, Chris Gerada, James Minshull

Research output: Journal PublicationConference articlepeer-review


Electric machines in aerospace applications are subjected to extremely high operating temperatures. This increases coercivity or decreases saturation flux density of the electrical steel resulting in increased core loss. The need for high power density and increased operating speed favours the use of thin gauge Silicon Steel (Si-Fe) and Cobalt Iron (Co-Fe) laminations for aerospace applications. Therefore, the variation in iron loss is studied for three grades of Si-Fe laminations by subjecting them to controlled ageing in laboratory. The analysis is also provided over a range of flux density and frequency to generalize the phenomenon over the operating domain. The results of ageing the laminations are in turn used to predict the degradation in performance of a 1.15 MW, 16-pole 48-slot propulsion machine for aerospace application. The degradation is estimated in terms of variation in iron loss. Iron loss is found to vary over a wide range (-11% to 5%) for thick gauge 0.35 mm SiFe lamination compared to a narrow range (0.8% to 2.7%) for thin gauge 0.1 mm lamination.

Original languageEnglish
JournalSAE Technical Papers
Issue number2022
Publication statusPublished - 2022
Externally publishedYes
EventSAE International AeroTech, AEROTECH 2022 - Virtual, Online, United States
Duration: 15 Mar 202224 Mar 2022

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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