Torque in nested Halbach cylinders

Author

Mhiocháin, T. R Ni ; Coey, J.M.D. ; Weaire, D.L. ; McMurry, S.M.

Author_Institution

Trinity Coll., Dublin, Ireland

Volume

Issue

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3968

Lastpage

3970

Abstract

Permanent magnet variable flux sources are produced by rotating two nested N-segment, permanent magnet, Halbach cylinders. Torque is primarily an end effect, determined by field nonuniformities due to the finite length and segmented structure of the cylinders. Due to symmetry, one cylinder experiences zero torque in a uniform applied field. Experiment and numerical simulation reveal that the torque is composed of a dominant term of frequency 1/(2π) and harmonics at (kN±1)/(2π), where k is an integer

Keywords

harmonics; magnetic flux; magnetisation; permanent magnets; torque; cylinder finite length; dipole rings; end effect; field nonuniformities; frequency term; harmonics; nested Halbach cylinders; numerical simulation; permanent magnet variable flux sources; reciprocity theorem; segmented structure; surface charge method; torque; Boring; Engine cylinders; Frequency; Magnetic field measurement; Magnetization; Numerical simulation; Permanent magnets; Position measurement; Torque; Wheels;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800724

Filename

800724

Link To Document

https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1260608