Design Formulas for Permanent-Magnet Bearings

[+] Author and Article Information
Brad Paden

Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106e-mail: paden@engineering.ucsb.edu

Nelson Groom

NASA LARC (ret.), P.O. Box 125, White Marsh, VA 23183e-mail: njgroom@visi.net

James F. Antaki

Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213e-mail: antaki@andrew.cmu.edu

J. Mech. Des 125(4), 734-738 (Jan 22, 2004) (5 pages) doi:10.1115/1.1625402 History: Received March 01, 2003; Revised April 01, 2003; Online January 22, 2004
Copyright © 2003 by ASME
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Magnetic bearing geometry with load; (a) isometric view, (b) axial cross-section and, (c) radial cross-section
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An axially magnetized bearing has same load capacity and stiffness as the bearing in Fig. 1 (See 1)
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Geometry of interacting periodically magnetized plates showing direction of magnetization
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Magnetization pattern in the stacked structure of Fig. 1. Br is the remanence of the permanent magnet material, λ is the spatial period of the bearing pole pattern, and z is the displacement along the axis of the bearing.
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Radial peak force versus normalized gap for bearings of Figs. 1 and 2; d/λ=1/8,1/4,1/2,∞; Br=1.3 Tesla
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Radial restoring force versus displacement for bearings of Figs. 1 and 2; d/λ=1/2;g0/λ=0.1,0.22,0.5,1.0; Br=1.3 Tesla
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Radial stiffness as a function of nominal gap d/λ=1/2;Br=1.3 Tesla
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Axial force as a function of axial displacement for two values of the radial displacement x(d=λ/2,g=0.22λ,Br=1.3 Tesla)




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