Low friction in mixed-mu superconducting bearings
- Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Boeing Defense & Space Group, Seattle, Washington 98124-2499 (United States)
Individual magnetic steel rotors were levitated by combining the attractive force between permanent magnets and the steel with the repulsive force between high-temperature superconductors and the steel. The free spindown of several rotors was observed, and the effective coefficient of friction for the bearing was calculated as a function of geometry. Low-speed coefficients of {lt}10{sup {minus}8} were observed, and the velocity dependence of MnZn ferrite rotors suggest that coefficients of {lt}10{sup {minus}6} are attainable at bearing rim velocities of 100 m/s.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 122295
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 78; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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