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Title: 以Arduino Due為基礎的超音波刀驅動電路
Authors: 范玟壇
Fan, Wen-Tan
Contributors: 電機與電子工程系
Keywords: 振動子
ultrasonic knife
tunable digital oscillation
Date: 2016-07-12
Issue Date: 2016-07-29 09:11:10 (UTC+8)
Abstract: 超音波切斷是藉由超音波振動信號傳導於刀具的切刃,使得刀具切刃與工作物之間的摩擦力降低,以提升其切斷的效果。超音波切斷應用包括有:超音波刀、超音波手術刀、超音波鋸、超音波切片機、超音波布料切斷裝置。
通常超音波刀係由四個機構組成:刀具、振動子、共振腔、驅動電路。而不同的超音波刀應用需使用不同形狀及材質的刀具,且透過共振腔可將機械振動的振幅放大,然驅動電路是控制整個超音波刀效能的最大關鍵組件。至於超音波刀驅動電路的核心則是調諧技術,其傳統的匹配調諧方法有自激式與他激式的RLC兩種,而此兩種技術均有各自的缺點。為了克服它們的問題,近年來已往數位式振盪調諧的方向發展。然數位式振盪調諧的晶片單價昂貴,導致超音波刀系統的成本過高。有鑑於此,本論文利用Arduino Due微控器可程式內建12位元之ADC及DAC的優勢,以替代數位式振盪調諧的控制晶片。經由實測的結果,本研究設計的超音波刀追頻技術,其頻率控制精準度可達到振盪調諧的最佳化,且可滿足一般超音波刀應用的需求。

Ultrasonic cutting is operated by ultrasonic vibration signaling to the tool cutting edge so that the friction between the tool cutting edge and the work piece is reduced in order to enhance its cutting effect. Ultrasonic cutting applications include: ultrasonic knives, ultrasonic scalpels, ultrasonic saws, ultrasonic cutting machines, ultrasonic fabric cutting devices.
Typically ultrasonic knife system consists of four parts: the tool, the vibrator, the resonance cavity, the drive circuit. Ultrasound knives in various applications require the different design in shapes and materials for the tool, and the mechanical vibration amplitude can be enlarged through those resonant horn. Also, the drive circuit to control the entire ultrasound knife plays a critical component to get the maximum performance. As the core technique of an ultrasonic drive circuit is a tunable model, there are two kinds of matching R.L.C. circuits with this traditional tuning method: self-excited and external-excited circuits. Actually, both of them have their own benefits and disadvantages, respectively. In order to overcome their problems in recent years, a digital tuning oscillation is a vital developing direction. However, the unit price of a digital tuning oscillation chip is expensive resulting that the cost of an ultrasonic knife system is still too high. For this reason, this thesis has discussed that an Arduino Due programmable microcontroller built on 12 bits of ADC and DAC has benefits to replace the tunable digital oscillation control chip. According to the experimental results measured by the designed ultrasonic knife frequency tracking technology, the accuracy of frequency control can be tuned to optimize the oscillation, and it can meet the needs of the general applications of ultrasound knives.
Appears in Collections:[電機與電子工程系] 學位論文

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