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By Takayuki Kishi, Mizuo Kudo, Hiromasa Iisaka (auth.), R. W. Fast (eds.)

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Extra resources for Advances in Cryogenic Engineering

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2. The solid line in the figure represents the combined chracteristics and the broken line represents the individual characteristics, respectively. 10 10,---------------~---------. 488 . 1 ~-p: -~ ' d! L) hok d . . t•l 0 s unc e , reglon r = 1. 66 for Helium gos .. 5. 6. 8. 7. Dimensionless load vs. O i's 2 •0 0183 nI • 18 I - . 30 ... 9. Dimensionless mass flow rate vs. 10. Heliumgasexpander 821 Table 2 Design Specifications of the Upper and Lower Bearing Upper bear i ng f~~y~ng restrictor nu~ber X Ia.

2. Magnetic bearing components. 811 turbomachines in which high resolution and bandwidth are required from a miniature sensing element small enough to be mounted in close proximity to the stator of the bearing. To satisfy these requirements, a compact capacitance sensor was developed to detect the shaft position. The shaft and sensing elements together comprise two plates of a capacitor, with the radial gap forming a portion of its capacitance, as shown in Figure 1. The sensor uses four electrically isolated electrodes which are supported in an annular plate.

Based on the stable and accurate positioning at high rotational speeds, we conclude that the bearing is suitable for high speed turbomachines. The integration of these bearings in a compressor has just gotten underway. ACKNOWLEDGEMENTS The present work to develop a miniature magnetic bearing was funded by NASA/Goddard Space Flight Center under contract NAS5-30854. Additionalfunding for the development of magnetic bearings for medium-sized cryogenic turbomachines was provided by DOE under contract DE-ACC01-87-ER80477.

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