NDLI: Lorentz Force on Permanent Magnet Rings by Moving Electrical Conductors

Content Provider	IEEE Xplore Digital Library
Author	Weise, K. Carlstedt, M. Ziolkowski, M. Brauer, H. Toepfer, H.
Copyright Year	1965
Abstract	This paper addresses the calculation of Lorentz forces generated by axially or radially magnetized ring magnets due to passing ferromagnetic conductors. The boundary value problem is solved using the Fourier transform while considering the interaction between the magnetic field of the ring magnet and the induced eddy currents. The Lorentz force and the induced eddy current density are evaluated in integral form, including modified Bessel functions of the first and the second kind. The famous creeping magnet problem where a magnet travels inside a conducting pipe is extended to ring magnets. The obtained expressions are evaluated and compared with the finite-element solutions. It is observed that radially magnetized ring magnets generate higher Lorentz forces compared with their axially magnetized counterparts. The described scenario is applicable in the framework of flow rate evaluation, non-destructive testing, or electromagnetic damping. We provide supplementary material in the form of MATLAB functions to efficiently analyze such problems in similar areas of application. The present contribution is of great interest for theoretical, pedagogical, and practical reasons.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	11
Page Count	11
File Size	1132605
File Format	PDF
ISSN	00189464
Volume Number	51
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic domains Conductors Magnetomechanical effects Magnetic levitation Eddy currents Magnetic resonance imaging Lorentz covariance Permanent magnets Analytical models Boundary value problems Electromagnetic induction permanent magnets boundary value problems eddy currents electromagnetic induction
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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