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Modelling and design for PM/EM magnetic bearingsA mathematical model of a permanent magnet/electromagnet (PM/EM) radially active bearing is presented. The bearing is represented by both a reluctance model and a stiffness model. The reluctance model analyzes the magnetic circuit of the PM/EM bearings. By combining the two models, the performance of the bearing can be predicted given geometric dimensions, permanent magnet strength, and the parameters of the EM coils. The overall bearing design including the PM and EM design is subject to the performance requirement and physical constraints. A study of these requirements and constraints is discussed. The PM design is based on the required magnetic flux for proper geometric dimensions and magnet strength. The EM design is based on the stability and force slew rate consideration, and dictates the number of turns for the EM coils and the voltage and current of the power amplifier. An overall PM/EM bearing design methodology is proposed and a case study is also demonstrated.
Document ID
19920018485
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Pang, D.
(Maryland Univ. College Park., United States)
Kirk, J. A.
(Maryland Univ. College Park., United States)
Anand, D. K.
(Maryland Univ. College Park., United States)
Johnson, R. G.
(Maryland Univ. College Park., United States)
Zmood, R. B.
(Royal Melbourne Inst. of Tech.)
Date Acquired
September 6, 2013
Publication Date
May 1, 1992
Publication Information
Publication: NASA. Langley Research Center, International Symposium on Magnetic Suspension Technology, Part 1
Subject Category
Mechanical Engineering
Accession Number
92N27728
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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