Performance of Halbach magnet arrays with finite coercivity

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A numerical method to study the effect of finite coercivity on the Halbach cylinder geometry is presented. Despite the fact that the analytical solution available for this geometry does not set any limit to the maximum air gap flux density achievable, in real life the non-linear response of the magnetic material and the fact that the coercivity is not infinite will limit the attainable field. The presented method is able to predict when and where demagnetization will occur, and these predictions are compared with the analytical solution for the case of infinite coercivity. However, the approach presented here also allows quantification of the decrease in flux density and homogeneity for a partially demagnetized magnet. Moreover, the problem of how to realize a Halbach cylinder geometry using a mix of materials with different coercivities without altering the overall performance is addressed. Being based on a numerical approach, the presented method can be employed to analyze the demagnetization effects due to coercivity for any geometry, even when the analytical solution is not available.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume407
Pages (from-to)369-376
Number of pages8
ISSN0304-8853
DOIs
Publication statusPublished - 2016

Keywords

  • Coercivity
  • Halbach cylinders
  • Magnetic field
  • Permanent magnet flux sources

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