Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-09-23
1993-04-20
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
33366, 73382R, 324346, H02K 709, G01V 308, G01C 906, G01M 112
Patent
active
052045684
ABSTRACT:
Superconducting bearings inhibit the excitation of modes in a superconducting force measuring instrument such as a superconducting gravimeter, and effecively damp such modes in the event they are excited. Excitation of modes is inhibited by magnetically and/or physically blocking orbital and rotational motions. Modes which are excited are efficiently damped, preferably by inducing eddy currents in lossy metal parts. These dissipative eddy currents remove energy from the motion, causing the motion to decay exponentially with time. A significant advantage of the bearing design is that the magnetic field of the bearing can be isolated from the main levitation system. This ensures that the bearing interferes minimally with the gravity measurement.
REFERENCES:
patent: 2293437 (1942-08-01), La Coste et al.
patent: 2377889 (1945-06-01), La Coste et al.
patent: 3424006 (1969-01-01), Dicke et al.
patent: 3449956 (1969-06-01), Goodkind et al.
patent: 3474672 (1969-10-01), La Coste et al.
patent: 3491600 (1970-01-01), Kasparian, Jr.
patent: 3554034 (1968-08-01), La Force
patent: 3680392 (1972-08-01), Hoffman et al.
patent: 3691850 (1972-09-01), Slater et al.
patent: 3742767 (1973-07-01), Bernard et al.
patent: 3965753 (1976-06-01), Browning, Jr.
patent: 4344235 (1982-08-01), Flanders
patent: 4349781 (1982-09-01), Vozoff
patent: 4445371 (1984-05-01), Lautzenhiser
patent: 4620752 (1986-11-01), Fremerey et al.
patent: 4956571 (1990-09-01), Gordon et al.
A. Sezginer and W. C. Chew, Image of a Static Current Loop Over a Superconducting Sphere, unpublished report (Aug. 1989).
A. Sezginer, Field of a Magnet in a Cylindrical Shield, unpublished notes (Dec. 1989).
Accuracy and Reliability in Land, Underwater, Air/Sea, Borehole and Earth-Tide Gravity Meters, brochure from LaCoste & Romberg Gravity Meters, Inc., Austin, Texas (4 pages, undated).
W. A. Prothero, A Cryogenic Gravimeter, Ph.D. dissertation, University of California, San Diego (1967).
W. A. Prothero et al., A Superconducting Gravimeter, Review of Scientific Instruments, vol. 39, No. 9, pp. 1257-1262 (1968).
GWR Superconducting Gravity Meter, brochure of GWR Instruments, San Diego, California (4 pages, Nov. 1985).
C. W. F. Everitt et al., Final Report on Contract NAS8-32605 to Perform Laboratory Research on Superconducting Bearings for Application in Cryogenic Experiments in Space, Stanford University (1980).
P. W. Worden, Jr., Measurement and Control of Disturbing Forces on an Equivalence Principle Experiment, Hansen Laboratories, Stanford University, California (preprint, 5 pages, undated).
P. W. Worden, Jr., Measurement of Small Forces with Superconducting Magnetic Bearings, Precision Engineering, vol. 4, No. 3, pp. 139-144 (1982).
T. A. Buchhold, The Magnetic Forces on Superconductors and Their Applications for Magnetic Bearings, Cryogenics, vol. 2, pp. 203-211 (Jun. 1961).
K. W. Rigby, Design of Magnets Inside Cylindrical Superconducting Shields, Review of Scientific Instruments, vol. 59, No. 1, pp. 156-158 (1988).
R. B. Lindsay, Physical Mechanics, D. Van Nostrand Company, Inc. (1961), pp. 359-360.
Griffin Douglas D.
Kleinberg Robert L.
Warburton Richard J.
GWR Instruments
LaBalle C.
Riter Bruce D.
Stephan Steven L.
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