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|Title: ||以Arduino Due為基礎的超音波刀驅動電路|
tunable digital oscillation
|Issue Date: ||2016-07-29 09:11:10 (UTC+8)|
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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