Coreless and Conventional Axial Flux Permanent Magnet Motors for Solar Cars

Narges Taran, Vandana Rallabandi, Greg Heins, Dan M. Ionel

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


Axial flux permanent magnet (AFPM) motors are suitable options for solar-powered vehicles due to their compact structure and high torque density. Furthermore, certain types of AFPM machines may be configured without stator cores, which eliminates associated losses and cogging torque and simplifies the manufacturing and assembly. This paper examines two machine designs for use in the solar-powered vehicle of the challenger class - a single rotor, single stator conventional AFPM machine, and a coreless AFPM machine with multiple stator and rotor disks. The response surface methodology (RSM) is utilized for the systematic comparison of the conventional and coreless topologies and to select the optimum designs among several hundreds of candidates. Designs with minimum losses and mass producing required torque with larger air-gap are favored. The performance of the selected designs has been studied via three-dimensional finite element analysis (FEA). The FEA parametric modeling methodology is validated by measurements on three AFPM machines of the conventional and coreless type.

Original languageEnglish
Article number8410487
Pages (from-to)5907-5917
Number of pages11
JournalIEEE Transactions on Industry Applications
Issue number6
StatePublished - Nov 1 2018

Bibliographical note

Funding Information:
The financial support of University of Kentucky, the L. Stanley Pigman endowment and the SPARK program, of ANSYS Inc. for the software and of Arnold Magnetic Technologies for building the PM prototype rotor is gratefully acknowledged. The authors also thank Professor J. F. Eastham of University of Bath and Mr. Chris Heintz of University of Kentucky for their contributions, including experimental data.

Publisher Copyright:
© 1972-2012 IEEE.


  • Axial flux permanent magnet (AFPM) machines
  • coreless
  • design of experiments (DOE)
  • finite element analysis (FEA)
  • multidisk
  • response surface methodology (RSM)
  • solar-powered electric vehicles
  • winding factor

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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