Analytical analysis of a novel double layer halbach permanent magnet array

Baoquan Kou, Haichuan Cao, Weili Li, Xiaochen Zhang

Research output: Journal PublicationArticlepeer-review

19 Citations (Scopus)


A slotless high-speed permanent magnet synchronous motor with a novel double layer Halbach array is proposed in this paper. A simple structure, easily optimize, and a well sine air-gap flux density can be obtained with this array. The flux density distribution of double-layer Halbach array is solved analytically by using the scalar magnetic potential. Expressions of the flux density distribution and back-EMF of the motor are derived successively. Analysis shows that the optimized air gap flux density harmonic distortion rate is only 0.5%, and the electric potential of the harmonic content is also very small. A prototype is manufactured, and some experiments are carried out with it. The reasonableness of the analytical method is validated by comparing with the simulation results and measured results.

Original languageEnglish
Pages (from-to)68-76
Number of pages9
JournalDiangong Jishu Xuebao/Transactions of China Electrotechnical Society
Issue number10
Publication statusPublished - 25 May 2015
Externally publishedYes


  • Analytical analysis
  • Double layer Halbach
  • High speed motor
  • Permanent magnet array

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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