NDLI: Gyro-Effect and Earnshaw's Theorem: Stable and Unstable Equilibrium for Rotary and Stationary Permanent Magnetic Levitators

Content Provider	IEEE Xplore Digital Library
Author	Qian, K.X. Xu, H.X.
Copyright Year	2008
Description	Author affiliation: Inst. BME, Jiang-su Univ., Zhenjiang (Qian, K.X.; Xu, H.X.)
Abstract	Eamshsm's theorem(1839) stated that no stationary object made of magnets in a fixed configuration can be held in stable equilibrium by any combination of static magnetic or gravitational forces. What happens by a moving body like a rotating passive magnetic levitator? Nobody has given an answer until now. The author applied a self-made passive magnetic bearing to radial pump and turbine machine, and found that if the rotating speed could be higher than a critical value, 3250rpm by a pump and 1800rpm by a turbine, the rotors would be disaffiliated from stators and keep the rotation stable. It seems that the fast rotating levitator has a so-called "Gyro-effect" which makes the passive maglev rotator stable. These results have extended Earnshaw's theorem from static to dynamic equilibrium: In stationary state or by a speed lower than critical value, the permanent maglev rotator cannot keep rotation stable; if the rotating speed is higher than critical speed, the permanent maglev rotator will have Gyro-effect which stabilizes unstable levitator.
Starting Page	1323
Ending Page	1325
File Size	472045
Page Count	3
File Format	PDF
ISBN	9781424417476
DOI	10.1109/ICBBE.2008.659
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-16
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stability Magnetic separation Pumps Rotors Stators Magnets Turbines Magnetic levitation Dynamic equilibrium Engine cylinders
Content Type	Text
Resource Type	Article

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