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Impact of Stator Segmentation on the Performance of Aerospace Propulsion Machines

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

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Professor of Electrical Engineering

James Minshull


Electric machines offering a high power density are required for aerospace applications. Soft magnetic material with a high saturation flux density is one of the key component which is required to realize these power density targets. The need for a high saturation flux density necessitates the use of cobalt iron lamination over the conventional silicon steel. However, cobalt iron is very expensive i.e. order of 10 in comparison to silicon steel. Stator segmentation is identified as an appropriate method to reduce the wastage and cost associated with lamination. Consequently, in this paper, stator segmentation is analyzed on a 1.35 MW, 16-pole 48-slot propulsion machine. The impact of manufacturing is accounted by controlling the resulting airgap between the segmented structures. Electromagnetic performance for various segmented topologies are compared in terms of torque, torque ripple, and iron loss. Average torque is found to degrade by nearly 10% with an increase in the number of stator segments and the thickness of resulting airgap. Therefore, a tight tolerance is required between the segmented parts to retain the electromagnetic performance. On the other hand, this increases the cost of fabrication and nullifies the benefits offered by stator segmentation.


Ramanathan Mathavan Jeyabalan, R. K., Vakil, G., Gerada, D., Gerada, C., & Minshull, J. (2022). Impact of Stator Segmentation on the Performance of Aerospace Propulsion Machines. SAE Technical Papers, 4(4), 1048-1056.

Journal Article Type Conference Paper
Conference Name AeroTech
Conference Location Pasadena California, United States
Acceptance Date Jan 7, 2022
Online Publication Date Mar 8, 2022
Publication Date Mar 8, 2022
Deposit Date May 19, 2022
Publicly Available Date Sep 9, 2022
Journal SAE Technical Papers
Publisher SAE International
Peer Reviewed Peer Reviewed
Volume 4
Issue 4
Pages 1048-1056
Public URL
Publisher URL
Related Public URLs
Additional Information Technical Paper 2022-01-0039


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