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Paper Abstract and Keywords
Presentation 2017-07-27 15:15
Performance improvement of ultrasonic motor using polymer-based vibrator -- Employment of triple-layered vibrator and higher-order vibration modes --
Jiang Wu, Yosuke Mizuno, Kentaro Nakamura (Tokyo Tech) US2017-41
Abstract (in Japanese) (See Japanese page) 
(in English) Our previous study has shown that, comparing to the conventional metal-based ultrasonic motors, the polymer-based ultrasonic motors yield relatively high rotational speeds, but low output torques and power. In this study, we compared the elliptical motion shapes and the force factors, which affected the motor performance, between the polymer- and metal-based vibrators with the same structures. The polymer-based vibrators with practical dimensions yield much lower force factors than the metal-based vibrators owing to the great difference in the material constants between polymers and piezoelectric ceramics. Though the polymer-based thick vibrators can yield a force factor comparable to those of metal-based ones, the undesirable vibration components become large, and lead to the high frictional loss. To improve the motor performance, first, we introduced a triple-layered vibrator and optimally selected the vibration mode of the polymer-based vibrator. An alumina layer was sandwiched between the polymer vibrating body and the piezoelectric ceramic plate to enhance the force factor. Then, we excited a higher-order vibration mode exhibiting a higher electromechanical coupling factor than the commonly-used bending mode on the polymer-based motor. The experimental results indicate that the motor performance is improved by using the triple-layered vibrator and the higher-order mode.
Keyword (in Japanese) (See Japanese page) 
(in English) Ultrasonic motor / polymer / elliptical motion / force factor / vibration mode / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 155, US2017-41, pp. 55-60, July 2017.
Paper # US2017-41 
Date of Issue 2017-07-20 (US) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee US  
Conference Date 2017-07-27 - 2017-07-27 
Place (in Japanese) (See Japanese page) 
Place (in English)  
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Paper Information
Registration To US 
Conference Code 2017-07-US 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance improvement of ultrasonic motor using polymer-based vibrator 
Sub Title (in English) Employment of triple-layered vibrator and higher-order vibration modes 
Keyword(1) Ultrasonic motor  
Keyword(2) polymer  
Keyword(3) elliptical motion  
Keyword(4) force factor  
Keyword(5) vibration mode  
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1st Author's Name Jiang Wu  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Yosuke Mizuno  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Kentaro Nakamura  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker
Date Time 2017-07-27 15:15:00 
Presentation Time 25 
Registration for US 
Paper # IEICE-US2017-41 
Volume (vol) IEICE-117 
Number (no) no.155 
Page pp.55-60 
#Pages IEICE-6 
Date of Issue IEICE-US-2017-07-20 


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