Air inlet/outlet arrangement for rotor cooling application of axial flux PM machines

Ahmad Syahid Fawzal, Remus Cirstea, Tim Woolmer, Mike Dickison, Mike Blundell, Konstantinos N. Gyftakis

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)
120 Downloads (Pure)


The maximum power and torque of a Permanent Magnet (PM) machine may be limited by its magnets’ temperature. An operational temperature above the magnets’ threshold may cause demagnetization, particularly under abnormal conditions. For Axial Flux Permanent Magnet (AFPM) machines, the PMs are mounted on its rotor, therefore, one way to regulate the PM temperature is via an appropriate rotor cooling method. Selective designs of air inlet and outlet arrangement have been studied by the Computational Fluid Dynamics (CFD) analysis to assess and compare their flow and cooling capabilities. The new cooling designs were then implemented on a Yokeless and Segmented Armature (YASA) machine for flow experimental validation. Additionally, the cooling performance after the design implementation is analysed via CFD. This paper’s proposed cooling method is expected to lead to lower magnet temperatures, thus increased reliability, output power and efficiency.
Original languageEnglish
Pages (from-to)1520-1529
Number of pages10
JournalApplied Thermal Engineering
Early online date24 Nov 2017
Publication statusPublished - 5 Feb 2018

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Applied Thermal Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Thermal Engineering, [130, (2017)] DOI: 10.1016/j.applthermaleng.2017.11.121

© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International


  • CFD
  • Axial flux machine
  • Rotor cooling
  • Permanent magnet machines
  • Heat transfer


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