Relative Permeability in a 3D Analytical Surface Charge Model of Permanent Magnets

Author

Kremers, M.F.J. ; Paulides, J.J.H. ; Ilhan, E. ; Janssen, J.L.G. ; Lomonova, E.A.

Author_Institution

Eindhoven Univ. of Technol., Eindhoven, Netherlands

Volume

49

Issue

5

fYear

2013

fDate

May-13

Firstpage

2299

Lastpage

2302

Abstract

The analytical surface charge model is used to calculate the magnetic field of magnets in 3D in an unbounded domain. The method combines high accuracy with a short calculation time. However, in the classical method the relative permeability of the magnet is assumed to be equal to air. This introduces an error in the resulting magnetic field strength. In this paper the permeability of the magnet is taken into account in the form of a redistribution of magnetic surface charge. As such, an exact solution for the magnetic field at low relative permeability is obtained. The interaction force between two magnets is calculated using the newly obtained expressions for the magnetic field and compared with FEM and measurements.

Keywords

finite element analysis; magnetic domains; magnetic permeability; permanent magnets; 3D analytical surface charge model; FEM; interaction force; magnet permeability; magnetic field strength; magnetic surface charge redistribution; permanent magnets; unbounded domain; Magnetic charge; magnetic fields; magnetic scalar potential; relative permeability modeling;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2239976

Filename

6514525