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Performance investigation on ultrasonic levitation
axial bearing for flywheel storage system |
| Taijiang PENG,Zhigang YANG,Junwu KAN,Fengjun TIAN,Xiaohong CHE, |
| College of Mechanics
and Control Engineering, Shenzhen University, Shenzhen 518060, China; |
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Abstract The bearing is an important basic mechanical part for supporting a shaft. A flywheel storage system needs a type of noncontact support bearing to enhance the speed of the axis. A magnetic suspension bearing is one type of noncontact bearing but has electromagnetic interference to other electric equipment. Based on the performance research of ultrasonic levitation technology, a novel noncontact bearing called ultrasonic bearing is presented, which consists of a special piezoelectric vibrator supporting the load. Experiments are carried out to study the relationships among the amplitude of the vibrator and levitation clearance, the highest speed of the axis, and the frictional moment of the axis. Results show that the levitation clearance becomes smaller gradually with increasing load; the rotation speed is up to 8946 r/min, and the friction moment is only 2.095×10−5 N·m when the levitation clearance is 8.53 μm. The ultrasonic bearing is highlighted because of its simple structure, strong levitation ability, and low friction moment.
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| Keywords
ultrasonic bearing
flywheel storage system
piezoelectric ceramic
piezoelectric vibrator
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Issue Date: 05 December 2009
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