Passive Contra-Magnetized Parallel-Airgap Serial Flux Magnetic Bearings

Conventional magnetic bearings accomplish a specific load capacity, defined as the ratio of maximum sustainable weight to the total self-weight, of up to 35:1. In this paper, the authors introduce a class of passive magnetic bearings that comprise a large number of parallel airgaps and discs and can...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part C, Journal of mechanical engineering science Journal of mechanical engineering science, 2010-11, Vol.224 (11), p.2515-2524
Main Authors: Kalita, K, Khoo, W K S, Garvey, S D, Hill-Cottingham, R J, Rodger, D, Eastham, J F
Format: Article
Language:English
Subjects:
Air gaps
Bearings
Carrying capacity
Design analysis
Design optimization
Disks
Finite element method
Flux
Load
Machinery
Magnetic bearings
Magnetism
Mathematical analysis
Mathematical models
Mechanical engineering
Mesh generation
Nested loops
Sustainability
Symmetry
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Summary:Conventional magnetic bearings accomplish a specific load capacity, defined as the ratio of maximum sustainable weight to the total self-weight, of up to 35:1. In this paper, the authors introduce a class of passive magnetic bearings that comprise a large number of parallel airgaps and discs and can deliver specific load capacities substantially higher than 35:1. Two-dimensional planar, two-dimensional axi-symmetric, and three-dimensional finite-element analysis (FEA) have been undertaken to predict the force capability of the bearings. An unoptimized prototype passive magnetic bearing is constructed to demonstrate the concept and its force-carrying capacity. The experimental results are then compared with those obtained from the FEA. Further optimization of the bearings is done across the whole design space comprising tens of thousands of models using an automatic mesh generator in conjunction with solving the FE models in nested loops.
ISSN:0954-4062
2041-2983
DOI:10.1243/09544062JMES2071