Driving wave-shape control for high-power ultrasonic trasnducer
Project/Area Number |
15K13895
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Multi-year Fund |
Research Field |
Dynamics/Control
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Research Institution | The University of Tokyo |
Principal Investigator |
MORITA Takeshi 東京大学, 新領域創成科学研究科, 准教授 (60344735)
|
Project Period (FY) |
2015-04-01 – 2016-03-31
|
Project Status |
Completed (Fiscal Year 2015)
|
Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
|
Keywords | 強力超音波 / 共振周波数 / 圧電現象 / 共振周波数制御 |
Outline of Final Research Achievements |
For the high-power ultrasonic transducers operation, it is often required to control the resonant frequency to realize non-sinusoidal wave. For example, ultrasonic motors which are driven with saw-shaped vibration, the shift of resonant frequency results in the performance degradation. To overcome this problem, this study proposes a dynamic control system of the resonant frequency modification by connecting MOSFETs to the additional piezoelectric parts. By switching on and off of the MOSFETs, the electric boundary condition for the additional piezoelectric parts changes between shorten and open. Generally, the resonant frequencies under these condition have the relationship of f(shorten) < f(open) because of the piezoelectric effect. By switching the MOSFETs as the same frequency to the driving frequency and changing the switching duty ratio, the resonant frequency could be modified as a function of the duty ratio.
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Report
(2 results)
Research Products
(3 results)