Shell elements for the computation of magnetic forces

Author

Ren, Z. ; Cendes, Z.

Author_Institution

Ansoft Corp., Pittsburgh, PA, USA

Volume

37

Issue

5

fYear

2001

fDate

9/1/2001 12:00:00 AM

Firstpage

3171

Lastpage

3174

Abstract

The local application of the principle of virtual work for the computation of magnetic forces requires a layer of elements around the object. It fails to work when the object is touching other objects or when the boundary element method is applied on its boundary. To overcome this difficulty, a shell element is introduced on the boundary of the object. Derivation of magnetic co-energy (or energy) is performed on the shell element with the help of edge element basis and the local Jacobian derivative technique. The force expression derived from this method shows a close similarity to the Maxwell stress tensor. Efficiency of the method is shown through the computation of magnetic force on the moving core of an electromagnet when it touches the fixed yoke

Keywords

Jacobian matrices; boundary-elements methods; electromagnets; magnetic forces; boundary element; edge element basis; electromagnet; fixed yoke; force expression; local Jacobian derivative technique; magnetic co-energy; magnetic forces; moving core; shell elements; virtual work; Boundary element methods; Current; Distributed computing; Electromagnets; Finite element methods; Jacobian matrices; Magnetic cores; Magnetic forces; Material properties; Tensile stress;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.952569

Filename

952569