DocumentCode :
1059979
Title :
High Rotational-Rate Rotor With High-Temperature Superconducting Bearings
Author :
Hull, J.R. ; Strasik, M. ; Mittleider, J.A. ; Gonder, J.F. ; Johnson, P.E. ; McCrary, K.E. ; McIver, C.R.
Author_Institution :
Boeing Co., Seattle, WA, USA
Volume :
19
Issue :
3
fYear :
2009
fDate :
6/1/2009 12:00:00 AM
Firstpage :
2078
Lastpage :
2082
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/f1/2.
Keywords :
high-temperature superconductors; machine bearings; permanent magnet motors; HTS bearings; circumferential inhomogeneity; high rotational-rate rotor; high-temperature superconducting bearings; rotational deceleration; rotor speed; Bulk HTS; flywheel energy storage; magnetic levitation;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2009.2017864
Filename :
5067124
Link To Document :
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