Ultrasonic Motor Operating in Longitudinal-Torsional Degenerate-Mode

Takeshi INOUE; Osamu MYOHGA; Noriko WATARI; Takeya HASHIGUCHI; Sadayuki UEHA

Ultrasonic Motor Operating in Longitudinal-Torsional Degenerate-Mode

Takeshi INOUE, Osamu MYOHGA, Noriko WATARI, Takeya HASHIGUCHI, Sadayuki UEHA

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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, 0.55 kgfcm maximum torque, 50% maximum efficiency, 2.5 W consumed power and a lifetime over 1000 hours with continuous rotation.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E80-A No.12 pp.2540-2547

Publication Date: 1997/12/25

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Category: Acoustics

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Takeshi INOUE, Osamu MYOHGA, Noriko WATARI, Takeya HASHIGUCHI, Sadayuki UEHA, "Ultrasonic Motor Operating in Longitudinal-Torsional Degenerate-Mode" in IEICE TRANSACTIONS on Fundamentals, vol. E80-A, no. 12, pp. 2540-2547, December 1997, doi: .
Abstract: 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, 0.55 kgfcm maximum torque, 50% maximum efficiency, 2.5 W consumed power and a lifetime over 1000 hours with continuous rotation.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/e80-a_12_2540/_p

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@ARTICLE{e80-a_12_2540,
author={Takeshi INOUE, Osamu MYOHGA, Noriko WATARI, Takeya HASHIGUCHI, Sadayuki UEHA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Ultrasonic Motor Operating in Longitudinal-Torsional Degenerate-Mode},
year={1997},
volume={E80-A},
number={12},
pages={2540-2547},
abstract={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, 0.55 kgfcm maximum torque, 50% maximum efficiency, 2.5 W consumed power and a lifetime over 1000 hours with continuous rotation.},
keywords={},
doi={},
ISSN={},
month={December},}

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TY - JOUR
TI - Ultrasonic Motor Operating in Longitudinal-Torsional Degenerate-Mode
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2540
EP - 2547
AU - Takeshi INOUE
AU - Osamu MYOHGA
AU - Noriko WATARI
AU - Takeya HASHIGUCHI
AU - Sadayuki UEHA
PY - 1997
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E80-A
IS - 12
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - December 1997
AB - 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, 0.55 kgfcm maximum torque, 50% maximum efficiency, 2.5 W consumed power and a lifetime over 1000 hours with continuous rotation.
ER -