Ultrasonic Motor Operating in Longitudinal-Torsional Degenerate-Mode
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概要
- 論文の詳細を見る
The efficiency and reliability of an ultrasonic motor, operating in longitudinal-torsional degenerate-mode, are investigated. It is essential to miniaturize both longitudinal and torsional mode piezoelectric ceramic elements, in order to produce low-cost ultrasonic motors, and to realize a motor with low battery power consumption. The ultrasonic motor is designed with an accurate mechanical equivalent circuit, which can produce high design precision notwithstanding low computation cost. It is important in this design that the resonant frequencies of longitudinal mode and torsional mode coincide with each other under the pertinent rotor pressing force and longitudinal and torsional mode piezoelectric ceramic elements are located in the vibration nodes for the longitudinal mode and the torsional mode, respectively. As a result, the fabricated motor, whose rotor diameter was 12 mm, produced 480 r.p.m. no-load revolution speed, 0.55kgf・cm maximum torque, 50% maximum efficiency, 2.5 W consumed power and a lifetime over l000 hours with continuous rotation.
- 社団法人電子情報通信学会の論文
- 1997-12-25
著者
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Inoue Takeshi
Material Development Center, NEC Corporation
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Watari Noriko
Nec Informatec Systems Ltd.
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Watari Noriko
Nec Informatics Systems Ltd.
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Ueha Sadayuki
Precision And Intelligence Lab. Tokyo Inst. Of Technol.
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MYOHGA Osamu
Material Development Center, NEC Corporation
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Myohga O
Material Development Center Nec Corporation
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Myohga Osamu
Material Development Center Nec Corporation
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HASHIGUCHI Takeya
NEC Environment Engineering Co.Ltd.
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Inoue Takeshi
Material Development Center Nec Corporation
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