A 3D dynamic lumped parameter thermal network of air-cooled yasa axial flux permanent magnet synchronous machine

Research output: Contribution to journalArticleScientificpeer-review


  • Abdalla Hussein Mohamed
  • Ahmed Hemeida
  • Alireza Rashekh
  • Hendrik Vansompel
  • Antero Arkkio

  • Peter Sergeant

Research units

  • Ghent University
  • Cairo University
  • Flanders Make


To find the temperature rise for high power density yokeless and segmented armature (YASA) axial flux permanent magnet synchronous (AFPMSM) machines quickly and accurately, a 3D lumped parameter thermal model is developed and validated experimentally and by finite element (FE) simulations on a 4 kW YASA machine. Additionally, to get insight in the thermal transient response of the machine, the model accounts for the thermal capacitance of different machine components. The model considers the stator, bearing, and windage losses, as well as eddy current losses in the magnets on the rotors. The new contribution of this work is that the thermal model takes cooling via air channels between the magnets on the rotor discs into account. The model is parametrized with respect to the permanent magnet (PM) angle ratio, the PM thickness ratio, the air gap length, and the rotor speed. The effect of the channels is incorporated via convection equations based on many computational fluid dynamics (CFD) computations. The model accuracy is validated at different values of parameters by FE simulations in both transient and steady state. The model takes less than 1 s to solve for the temperature distribution.


Original languageEnglish
Article number774
Number of pages16
Issue number4
Publication statusPublished - 1 Apr 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • AFPMSM, Axial flux machines, FEM, LPTN, Thermal model, YASA

Download statistics

No data available

ID: 19168839