2007 Fiscal Year Final Research Report Summary
Research of high efficiency transducer by ultrasonic motor principle
| Project/Area Number |
17560214
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | Shibaura Institute of Technology |
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Principal Investigator |
OHGA Juro Shibaura Institute of Technology, Faculty of Engineering, Professor (30327754)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Yuko Tokyo Denki University, Faculty of Informations and Environment, Teacher (20287444)
HAMADA Hareo Tokyo Denki University, Graduate School for Informations and Environment, Professor (00164913)
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| Project Period (FY) |
2005 – 2007
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| Keywords | loudspeaker / ultrasonic motor / velocity modulation / inertia ring / paper cone / digital modulation |
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| Research Abstract |
The piezoelectric ultrasonic motor is characterized by very high mechanical impedance due to the mechanical contact of rotor and stator. It shows no idle run.
The application of loudspeakers for audio signals are growing to be broad. The requirements for, especially, very low frequency range radiation cannot be met by conventional electro-dynamic transducer principles.
This research work relates to the application of ultrasonic motors for driver of direct-radiator loudspeakers for less than 1 kHz, by construction of small, efficient and highly controllable modulator-type transducers. After a few experiments and analysis by preliminary models, use of continuous revolution of the motor, modulated by audio signals, are known to be useful. The advanced model by using too co-axle ultrasonic motors showed practical performances.
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Research Products
(36 results)
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[Journal Article] Direct radiator loudspeaker by continuous revolution of ultrasonic motor2007
Author(s)
Y., Ohnuma, Y., Iwaki, J., Ohga, H., Negishi, T., Sashida, K., Maeda
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Journal Title
Proc. AES 13th Regional Convention, Tokyo 0015
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Direct radiator loudspeaker by continuous revolution of ultrasonic motor2007
Author(s)
Y., Ohnuma, Y., Iwaki, J., Ohga, H., Negishi, T., Sashida, K., Maeda
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Journal Title
Proc. ICA 2007 ELE-01-012
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Direct radiator loudspeaker by continuous revolution of ultrasonic motor2007
Author(s)
Y., Ohnuma, Y., Iwaki, J., Ohga, H., Negishi, T., Sashida, K., Maeda
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Journal Title
Technical Report , IEICE [in Japanese] EA2007-24
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 超音波モータスピーカシステムにおける駆動部構造の比較検討2008
Author(s)
千葉 俊輔, 久保田 一(千葉工大), 大沼 悠太, 大賀 寿郎(芝浦工大), 根岸 廣和(エセックス大), 大平 郁夫(アシダ音響), 前田 和昭, 松本 泰, 栗栖 清浩(TOA), 指田 年生(新生工業)
Organizer
音響学会春季研究発表会論文集 1-6-14
Place of Presentation
千葉工業大学
Year and Date
20080300
Description
「研究成果報告書概要(和文)」より
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[Presentation] 超音波モータスピーカシステムの最大音圧の検証2008
Author(s)
東田 啓吾, 村上 翔(千葉工大), 栗栖 清浩(TOA), 大賀 寿郎(芝浦工大), 大平 郁夫(アシダ音響), 久保田 一(千葉工大), 根岸 廣和(エセックス大)
Organizer
日本音響学会春季講演会論文集 1-6-15
Place of Presentation
千葉工業大学
Year and Date
20080300
Description
「研究成果報告書概要(和文)」より
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[Presentation] 超音波モータスピーカシステムにおける駆動、変調方式による性能比較2008
Author(s)
増田 裕輔(千葉工大), 大沼 悠太, 大賀 寿郎(芝浦工大), 前田 称昭, 栗栖 清浩, 松本 泰, 末次 利光(TOA), 指田 年生(新生工業), 根岸 廣和(エセックス大), 久保田 一(千葉工大)
Organizer
日本音響学会春季講演会論文集 1-6-16
Place of Presentation
千葉工業大学
Year and Date
20080300
Description
「研究成果報告書概要(和文)」より
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[Presentation] 「研究成果報告書概要(欧文)」より2008
Author(s)
S., Chiba, H., Kubota, Y., Ohnuma, J., Ohga, H., Negishi, I., Oohira, K., Maeda, T., Matsumoto, K., Kurisu, T., Sashida
Organizer
ASJ Spring Conference
Year and Date
20080300
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[Presentation] Examination of maximum output sound pressure of loudspeakersystem by ultrasonic motor2008
Author(s)
K., Higashida, S., Murakami, K., Kurisu, J., Ohga, I., Oohira, H., Kubota H., Negoshi
Organizer
ASJ Spring Conference
Year and Date
20080300
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Comparison of peaformance by driving and modulation methods of Loudspeaker systems by ultrasonic motor2008
Author(s)
Y., Masuda, Y., Ohnuma, J., Ohga, K., Maeda, K., Kurisu, T., Matsumoto, T., Suetugu, T., Sashida, H., Negoshi, H., Kubota
Organizer
ASJ Spring Conference
Year and Date
20080300
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Improvement of construction of direct radiator loudspeaker by continuous revolution of ultrasonic motor2008
Author(s)
Y., Onuma, T., Sakabe, T., Matsumura, J., Ohga, H., Negishi, K., Maeda
Organizer
ASJ Spring Conference
Year and Date
20080300
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Relationship of dissipated power and acoustical output of ultrasonic-motor -loudspeaker, Pt. 1. Direct radiator type by continuous revolution2007
Author(s)
H., Negishi, T., Yanai, Y., Ohnuma, Y., Iwaki, J., Ohga, H., Sakane, K., Kurisu
Organizer
ASJ Spring Conference
Year and Date
20070300
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Characteristics of loudspeaker by continuous revolution of ultrasonic motor2007
Author(s)
Y., Ohnuma, Y., Iwaki, T., Yanai, J., Ohga, H., Negishi, K., Maeda
Organizer
ASJ Spring Conference
Year and Date
20070300
Description
「研究成果報告書概要(欧文)」より
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