Comparison of adjustable permanent magnetic field sources

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:322

Article

Bjork, R.¹  Bahl, C. R. H.¹  Smith, A.¹  Pryds, N.¹ 

[1] Tech Univ Denmark, Riso Natl Lab Sustainable Energy, Fuel Cells & Solid State Chem Div, DK-4000 Roskilde, Denmark

关键词: Magnetic field;    Permanent magnet flux source;    Halbach cylinder;    Mangle;   

DOI  :  10.1016/j.jmmm.2010.07.022

来源: Elsevier

【 摘 要 】

A permanent magnet assembly in which the flux density can be altered by a mechanical operation is often significantly smaller than comparable electromagnets and also requires no electrical power to operate. In this paper five permanent magnet designs in which the magnetic flux density can be altered are analyzed using numerical simulations, and compared based on the generated magnetic flux density in a sample volume and the amount of magnet material used. The designs are the concentric Halbach cylinder, the two half Halbach cylinders, the two linear Halbach arrays and the four and six rod mangle. The concentric Halbach cylinder design is found to be the best performing design, i.e. the design that provides the most magnetic flux density using the least amount of magnet material. A concentric Halbach cylinder has been constructed and the magnetic flux density, the homogeneity and the direction of the magnetic field are measured and compared with numerical simulation and a good agrement is found. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

Free