NDLI: Encapsulated HTS bearings: technical and cost considerations

Content Provider	IEEE Xplore Digital Library
Author	Werfel, F.N. Floegel-Delor, U. Riedel, T. Rothfeld, R. Wippich, D. Goebel, B.
Copyright Year	2002
Abstract	Thermal encapsulation of HTS is one way to fabricate high-efficient HTS magnetic bearings for flywheels, motors and generators. We have been designed, manufactured and tested 200 mm axial and radial bearings for loads close to 300 kg. The maximum load to bearing weight is in the 10 to 1 ratio. At 77 K, a vacuum cryostat around the HTS reduces basic thermal losses to 6.4 W with very small rotational ac losses of 0.1 W/1000 rpm. The encapsulation reduces the cryogenic threshold in the application and allows a convenient adaptation of cryo-coolers. Basic elements are the melt textured YBCO single crystals, appropriately machined and glued in a copper ring in the center of the vacuum cryostat combined with an intrinsic cryo-sorption pump. Ten axially stacked 200 mm PM rings comprise the magnetic excitation system of the rotor. The coefficient of friction is about 10/sup -4/ at ambient and 10 times lower at reduced pressure. For higher loads the manufacturing effort of HTS bearings, becomes comparable with mechanical bearings, increasing the chances of replacing mechanical bearings.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2306
Ending Page	2311
Page Count	6
File Size	664714
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High temperature superconductors Costs Encapsulation Magnetic levitation Manufacturing Mechanical bearings Flywheels Testing Cryogenics Yttrium barium copper oxide vacuum cryostat Bearing losses costs consideration friction HTS bearing thermal super-insulation
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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