Permanent-magnet linear eddy-current brake with a nonmagnetic reaction plate

Author

Edwards, J.D. ; Jayawant, B.V. ; Dawson, W.R.C. ; Wright, D.T.

Author_Institution

Sch. of Eng., Sussex Univ., Brighton, UK

Volume

146

Issue

6

fYear

1999

fDate

11/1/1999 12:00:00 AM

Firstpage

627

Lastpage

631

Abstract

A new two-dimensional analytical model is presented for a double-sided permanent-magnet brake with a nonmagnetic reaction plate, based on an equivalent volume current representation of the permanent magnets. An exact solution of the field equations for an infinitely long machine, together with an approximate treatment of end effects, leads to simple expressions for the braking and normal forces as functions of the secondary plate speed. These expressions clearly show the effects of the brake geometric parameters and the plate conductivity on the performance. The model has been validated by experimental measurement of the braking force as a function of speed, and by finite-element calculation of the flux density and normal force at standstill

Keywords

eddy current braking; finite element analysis; force; linear motors; magnetic flux; permanent magnets; brake geometric parameters; braking force; double-sided permanent-magnet brake; end effects; equivalent volume current representation; field equations solution; finite-element calculation; flux density; linear motion system; nonmagnetic reaction plate; normal forces; permanent-magnet linear eddy-current brake; plate conductivity; secondary plate speed;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings -

Publisher

iet

ISSN

1350-2352

Type

jour

DOI

10.1049/ip-epa:19990574

Filename

820088