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Determination of forces in a magnetic bearing actuator: Numerical computation with comparison to experiment computation with comparison to experiment

Publication ,  Journal Article
Knight, JD; Xia, Z; McCaul, E; Hacker, HJ
Published in: Journal of Tribology, Transactions of the ASME
1992

Calculations 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 104 the effects of changes in permeability are negligible, but below 104 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.

Duke Scholars

Published In

Journal of Tribology, Transactions of the ASME

Publication Date

1992

Volume

114

Issue

4

Start / End Page

796 / 801

Related Subject Headings

  • Mechanical Engineering & Transports
  • 4017 Mechanical engineering
  • 0913 Mechanical Engineering
  • 0904 Chemical Engineering
 

Citation

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Knight, J. D., Xia, Z., McCaul, E., & Hacker, H. J. (1992). Determination of forces in a magnetic bearing actuator: Numerical computation with comparison to experiment computation with comparison to experiment. Journal of Tribology, Transactions of the ASME, 114(4), 796–801.
Knight, J. D., Z. Xia, E. McCaul, and H Jr Hacker. “Determination of forces in a magnetic bearing actuator: Numerical computation with comparison to experiment computation with comparison to experiment.” Journal of Tribology, Transactions of the ASME 114, no. 4 (1992): 796–801.
Knight JD, Xia Z, McCaul E, Hacker HJ. Determination of forces in a magnetic bearing actuator: Numerical computation with comparison to experiment computation with comparison to experiment. Journal of Tribology, Transactions of the ASME. 1992;114(4):796–801.
Knight, J. D., et al. “Determination of forces in a magnetic bearing actuator: Numerical computation with comparison to experiment computation with comparison to experiment.” Journal of Tribology, Transactions of the ASME, vol. 114, no. 4, 1992, pp. 796–801.
Knight JD, Xia Z, McCaul E, Hacker HJ. Determination of forces in a magnetic bearing actuator: Numerical computation with comparison to experiment computation with comparison to experiment. Journal of Tribology, Transactions of the ASME. 1992;114(4):796–801.

Published In

Journal of Tribology, Transactions of the ASME

Publication Date

1992

Volume

114

Issue

4

Start / End Page

796 / 801

Related Subject Headings

  • Mechanical Engineering & Transports
  • 4017 Mechanical engineering
  • 0913 Mechanical Engineering
  • 0904 Chemical Engineering