Development of an axial flux MEMS BLDC micromotor with increased efficiency and power density

Xiaofeng Ding, Guanliang Liu, Min Du, Hong Guo, Hao Qiao, Christopher Gerada

Research output: Journal PublicationArticlepeer-review

8 Citations (Scopus)


This paper presents a rigorous design and optimization of an axial flux microelectromechanical systems (MEMS) brushless dc (BLDC) micromotor with dual rotor improving both efficiency and power density with an external diameter of only around 10 mm. The stator is made of two layers of windings by MEMS technology. The rotor is developed by film permanent magnets assembled over the rotor yoke. The characteristics of the MEMS micromotor are analyzed and modeled through a 3-D magnetic equivalent circuit (MEC) taking the leakage flux and fringing effect into account. Such a model yields a relatively accurate prediction of the flux in the air gap, back electromotive force (EMF) and electromagnetic torque, whilst being computationally efficient. Based on 3-D MEC model the multi-objective firefly algorithm (MOFA) is developed for the optimal design of this special machine. Both 3-D finite element (FE) simulation and experiments are employed to validate the MEC model and MOFA optimization design.

Original languageEnglish
Pages (from-to)6608-6626
Number of pages19
Issue number7
Publication statusPublished - 2015


  • Axial flux
  • Efficiency
  • Magnetic equivalent circuit (MEC)
  • Microelectromechanical system (MEMS)
  • Multi-objective firefly algorithm (MOFA)
  • Power density

ASJC Scopus subject areas

  • Control and Optimization
  • Energy (miscellaneous)
  • Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment


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