Applications of Permanent Maglev Bearing in Heart Pumps and Turbine Machine
| Autor: | Kunxi Qian, Hao Wang, Teng Jing |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | ISRN Mechanical Engineering. 2011:1-4 |
| ISSN: | 2090-5130 2090-5122 |
| DOI: | 10.5402/2011/896463 |
| Popis: | Earnshaw'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 will happen 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, 3250 rpm for a pump and 1800 rpm for 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 “Gyroeffect” which makes the passive maglev rotator stable. These results have extended Earnshaw's theorem from static to dynamic equilibrium. In static state or by a speed lower than critical value, the passive maglev rotator cannot keep rotation stable; if the rotating speed is higher than critical speed, the passive magnetic levitator will have Gyroeffect and thereby stabilize its rotation. |
| Databáze: | OpenAIRE |
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