3D Analytical model of drag and lift force for a conductive plate moving above a Halbach magnet array

When a conductive plate moves above a Halbach magnetic source, a magnetic field will be created in the air gap. This field induces eddy currents in the plate and creates drag and lift forces simultaneously. This phenomenon may be applied into eddy current brakes, couplings or magnetic levitation sys...

Full description

Saved in:
Bibliographic Details
Published in:Transactions of the Institute of Measurement and Control 2018-08, Vol.40 (12), p.3515-3524
Main Authors: Tongyu, Shi, Dazhi, Wang
Format: Article
Language:English
Subjects:
Air gaps
Couplings
Density distribution
Drag
Eddy current brakes
Field strength
Finite element method
Flux density
Lift
Magnetic fields
Magnetic levitation
Magnetic levitation systems
Magnetism
Mathematical models
Maxwell's equations
Model accuracy
Three dimensional models
Two dimensional analysis
Two dimensional models
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:When a conductive plate moves above a Halbach magnetic source, a magnetic field will be created in the air gap. This field induces eddy currents in the plate and creates drag and lift forces simultaneously. This phenomenon may be applied into eddy current brakes, couplings or magnetic levitation systems. In this paper, by utilizing the derived analytical field solutions of the Maxwell equations with magnetic scalar potential and magnetic field strength, the 3D lift and drag forces, and the flux density distribution in the air gap are predicted and analysed in the steady-state condition. Calculation results produced by analytical model are compared with those from the 3D finite element method. A prototype of the disk-type permanent magnetic eddy-current coupling has been manufactured to validate the accuracy of the 3D analytical model. The results confirm that, compared with 2D analytical model from the papers that had already published, the results calculated by the 3D analytical model have a higher accuracy in performance analysis. Finally, the characteristics of different kinds of magnet arrays are compared based on the proposed model, and several main problems are analysed and discussed.
ISSN:0142-3312
1477-0369
DOI:10.1177/0142331217724220