Research on Bimorph Ultrasonic Motors
Date Issued
2005
Date
2005
Author(s)
YANG, CHEN-HUI
DOI
zh-TW
Abstract
With the advance of technology, many kinds of consuming electronic products are broadly used in lives. How to make these products smaller and lighter is crucial to the success of these products. The demand of miniaturized mechanisms is gradually increasing. In all kinds of cameras, the focusing and zooming systems rely heavily on coil motors that move the lenses. However, the insufficiencies of coil motors have been an obstacle in the miniaturization of cameras. Therefore, it is a new application to use ultrasonic motors in focusing and zooming systems. The purpose of this research is to design a small-sized, light-weighted and mass-producible ultrasonic motor with low-cost operating equipments.
This research uses bimorph as the main structure of Bimorph Ultrasonic Motor (BUSM) with alumina as contact point material and driven surface material which take advantage of the wear-resistant ability. The operating modes are simulated and verified with ANSYS. After measuring of the maximum velocity, the maximum mechanical load which can be endured by BUSM and the energy transducing efficiency, BUSM has proved it is a small-sized, light-weighted, simply-designed and mass-producible ultrasonic motor with simple operating equipments. The maximum size of the shape is only 9 mm * 3 mm * 2.3 mm, and the maximum driving velocity and output force is 255 mm/s and 20.8 g. The volume-standardized performances of BUSM are outstanding in comparison with other ultrasonic motors. In the future, we are confident that the application of BUSM will be broad.
Subjects
超音波馬達
雙層壓電振動片
壓電材料
振動模態
響應頻率
變焦與對焦系統
ultrasonic motor
bimorph
piezoelectric material
vibration mode
resonant frequency
focusing and zooming systems
Type
thesis
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