NDLI: High Rotational-Rate Rotor With High-Temperature Superconducting Bearings

Content Provider	IEEE Xplore Digital Library
Author	Hull, J.R. Strasik, M. Mittleider, J.A. Gonder, J.F. Johnson, P.E. McCrary, K.E. McIver, C.R.
Copyright Year	2002
Abstract	We present results of an experiment with a 15.4-mm-dia, 150-mm-long rotor that uses HTS bearings for levitation and rotates in vacuum at kHz rates. Bearing losses are presented as a function of rotor speed up to a frequency of f = 1681 Hz. For f > 80 Hz (bearing resonances are at 28 and 41 Hz), the rotational drag increases monotonically with frequency up to a maximum at ~274 Hz, then decreases monotonically with frequency. For f >160 Hz, the rotational deceleration may be well represented by the term B + A(f/f₀)/[1+(f/f₀)²], where B and A are constants and f₀ is the frequency at the drag peak. The frequency dependent term may be interpreted as the circumferential inhomogeneity of the PM interacting with the flux-flow resistivity of the HTS. At higher speeds, the frequency-dependent term is governed by the skin depth and becomes proportional to 1/f^1/2.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2078
Ending Page	2082
Page Count	5
File Size	557335
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
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 Rotors Magnetic levitation Superconducting magnets Stators Frequency Coils Flywheels Engine cylinders Drag magnetic levitation Bulk HTS flywheel energy storage
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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