Losses in Magnetic Bearings

Chapter

Active magnetic bearings generally have much lower losses than roller bearings or fluid film bearings. However, since AMBs are complex mechatronic systems, there are many potential power loss mechanisms. Consequently, the minimizing of losses is the sum of various measures and depends very much on the requirements of the application. Whereas for turbomachinery, minimizing of the overall losses to increase the efficiency is most important, in vacuum applications like turbomolecular pumps, the focus lies on minimizing the losses in the rotor to avoid heating of the rotor since cooling is not effective. Figure ref fig:5.power_flow shows the flow of energy necessary to cover the losses from the sources (drive-electronics and AMB-electronics) to the power loss mechanisms.

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References

  1. 1.
    Heck, C., Magnetische Werkstoffe und ihre technische Anwendung. Dr. A. Hütling Verlag, 1975Google Scholar
  2. 2.
    Kornetzki, M. and Lucas, I., “Zur Theorie der Hystereseverluste im magnetischen Drehfeld”. Zeitschrift für Physik, Bd. 142, 1955, pp. 70–82.CrossRefGoogle Scholar
  3. 3.
    Mack, M., “Luftreibungsverluste bei elektrischen Maschinen kleiner Baugröβe”. Diss. TH Stuttgart, 1967.Google Scholar
  4. 4.
    Matsumura, K. and Hakate, K., “Relation between Pole Arrangement and Magnetic Loss in Magnetic Bearings”. 2nd Internat. Symp. on Magnetic Bearings, July 12-14, 1990, Tokyo, Japan.Google Scholar
  5. 5.
    Schlichting, H., Grenzschichttheorie. G. Braun Verlag, Karlsruhe, 1965.Google Scholar
  6. 6.
    Steinmetz, C., “Note on the Law of Hysteresis”. Electrician, 26, Jan. 1891, pp. 261–262.Google Scholar
  7. 7.
    Traxler, A., “Eigenschaften und Auslegung von berührungsfreien elektromagnetischen Lagern”. Diss. ETH Zürich, Nr. 7851, 1985.Google Scholar
  8. 8.
    Meeker D. C. and Maslen E. H., “Prediction of rotating losses in heteropolar radial magnetic bearings,” ASME Journal of Tribology, vol. 120, no. 3, pp. 629–635, 1998.CrossRefGoogle Scholar
  9. 9.
    Meeker D.C., Filatov A.V., and Maslen E.H., “Effect of Magnetic Hysteresis on Rotational Losses in Heteropolar Magnetic Bearings,” IEEE Transactions on Magnetics, vol. 40, No. 5., Sept. 2004.Google Scholar
  10. 10.
    Sigloch, H., Technische Fluidmechanik. Springer, 6. Aufl., 2007, ISBN: 978-3-540-44633-0.Google Scholar
  11. 11.
    Owen, J.M. and Rogers R.H., Flow & Heat Transfer in Rotating-Disc Systems, Volume 1 Rotor-Stator Systems, Research Studies Press, Wiley, 1989.Google Scholar
  12. 12.
    Mayle, R.E., Hess, S., Hirsch, C., and Van Wolfersdorf, J., “Rotor-Stator Gap Flow Analysis and Experiments,” IEEE Transactions on Energy Conversion, No. 13, 2, June 1998.Google Scholar

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© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.MECOS Traxler AG IndustriestrasseSwitzerland

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