DocumentCode :
1939012
Title :
Use of PM Bearings in Permanent Maglev Centrifugal Pumps for Stability Investigation
Author :
Qian, K.X. ; Jing, Tai
Author_Institution :
Inst. of BME, Jiangsu Univ., Zhenjiang
Volume :
2
fYear :
2008
fDate :
27-30 May 2008
Firstpage :
535
Lastpage :
538
Abstract :
It has been widely acknowledged that permanent maglev is unstable according to Earnshaw´s theory (1839). The author has found, however, that this theorem is applicable only to a levitator in static state. For dynamic equilibrium, such as by a levitator in rotary pump, there has been no answer until now to the question whether permanent maglev can be stable. To investigate the feasibility of permanent maglev pumps, a passive magnetic(PM) bearing in common use(Bearing A) and a novel PM bearing developed by the author (Bearing B) were used separately in 3 prototypes of centrifugal pumps: axially driven centrifugal pump, radially driven biventricular assist pump and radially driven centrifugal pump. It exhibited that the PM bearings could achieve stable maglev in all centrifugal pumps, if the rotor had high enough speed and thus obtained a so-called gyro-effect, namely, a rotating body with high enough speed could maintain its rotation stably.
Keywords :
artificial organs; centrifuges; gyromagnetic effect; magnetic bearings; magnetic levitation; permanent magnets; Earnshaw theory; blood pump; dynamic equilibrium; gyro effect; levitator; passive magnetic bearings; permanent maglev centrifugal pumps; rotary pump; Biomedical engineering; Biomedical informatics; Coils; Dynamic equilibrium; Engine cylinders; Magnetic levitation; Magnetic separation; Magnets; Prototypes; Stability;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
BioMedical Engineering and Informatics, 2008. BMEI 2008. International Conference on
Conference_Location :
Sanya
Print_ISBN :
978-0-7695-3118-2
Type :
conf
DOI :
10.1109/BMEI.2008.70
Filename :
4549231
Link To Document :
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