Multiphysics Optimisation of a Slotless Permanent Magnet Machine with a Composite Winding Layer

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)


Ambitious power density targets for future electric propulsion systems in air transport necessitate the development of novel electrical machine topologies. The Slot-Less Permanent Magnet machine (SLPM) topology presents a substantial weight reduction and opportunity to exploit innovative winding designs and high performance materials. However, a limiting feature of SLPM machines is the exposure of the stator winding layer to the rotor reaction torque which would normally be borne by the mechanically strong stator teeth. To address this issue, an SLPM machine with a glass fibre composite winding layer has been developed and the specific output benefits of using a skewed winding with no end overhang is assessed. An analytical multiphysics design procedure and optimisation routine is presented to maximise the mass power density (kW/kg) of an SLPM composite machine with the design benchmarked against a conventional slotted permanent magnet machine to highlight the volume and mass benefits of the SLPM topology.

Original languageEnglish
Title of host publicationECCE 2020 - IEEE Energy Conversion Congress and Exposition
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages8
ISBN (Electronic)9781728158266
Publication statusPublished - 11 Oct 2020
Event12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States
Duration: 11 Oct 202015 Oct 2020

Publication series

NameECCE 2020 - IEEE Energy Conversion Congress and Exposition


Conference12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020
CountryUnited States
CityVirtual, Detroit

Bibliographical note

Funding Information:
The authors wish to thank the EPSRC for supporting this research through a Doctoral Training Partnership.

Publisher Copyright:
© 2020 IEEE.

Copyright 2020 Elsevier B.V., All rights reserved.


  • aerospace propulsion
  • Faulhaber winding
  • multi-functional composites
  • slotless machine

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