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Determination of forces in a magnetic bearing actuator - Numerical computation with comparison to experimentCalculations of the forces exerted on a journal by a magnetic bearing actuator are presented, along with comparisons to experimentally measured forces. The calculations are based on two-dimensional solutions for the flux distribution in the metal parts and free space, using finite but constant permeability in the metals. Above a relative permeability of 10,000 the effects of changes in permeability are negligible, but below 10,000 decreases in permeability cause significant decreases in the force. The calculated forces are shown to depend on the metal permeability more strongly when the journal is displaced from its centered position. The predicted forces in the principal attractive direction are in good agreement with experiment when a relatively low value of permeability is chosen. The forces measured normal to the axis of symmetry when the journal is displaced from that axis, however, are significantly higher than predicted by theory, even with a value of relative permeability larger than 5000. These results indicate a need for further work including nonlinear permeability distributions.
Document ID
19930031689
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Knight, J. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Xia, Z.
(NASA Lewis Research Center Cleveland, OH, United States)
Mccaul, E.
(NASA Lewis Research Center Cleveland, OH, United States)
Hacker, H., Jr.
(Duke Univ. Durham, NC, United States)
Date Acquired
August 15, 2013
Publication Date
October 1, 1992
Publication Information
Publication: ASME, Transactions, Journal of Tribology
Volume: 114
Issue: 4
ISSN: 0742-4787
Subject Category
Mechanical Engineering
Accession Number
93A15686
Funding Number(s)
CONTRACT_GRANT: NAG3-968
Distribution Limits
Public
Copyright
Other

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