Research On Driving System Of Ultrasonic Feeding Device

The ultrasonic feeding device is a new type of transporting system, it is different from traditional ones in principle. The objects can be fed with the ultrasonic vibration excited by converse piezoelectric effect of piezoelectric ceramic on vibrator's surface. The ultrasonic feeding device possesses the follow merits: no noise, simple structure, compactness in size, low feeding velocity, easy to control etc. So, it is widely applied in the fields of precise feeding of small quantity.In order to excite ultrasonic vibration in piezoelectric vibrator, a simple, economical driving power source suitable for standing wave ultrasonic feeding device is put forward. Principle of driving power source is concentrated on, operational principles of the feeding device is introduced. Equivalent circuit model of piezoelectric vibrator which provides theoretical basis for the driving power source and control system in performance analysis and design is established. Firstly, according to these researches, the driving power source scheme is designed, and the different responses of piezoelectric vibrator on square wave and sine wave are theoretically analyzed. Based on the experiment results, the square wave is chosen. Then, Signal generator, Phase shifting and frequency division, Power amplifiers and Transformer are designed and simulated respectively. Moreover, protective circuit of the power amplifiers is analyzed detailedly, and the pulse transformer is designed and made. To solve the impedance matching problem of feeding device, the matching methods are investigated, and it meets the needs of driving power source. Finally, several important parameters influence on the performance of the feeding device are simulated and the results are analyzed in detail. The thesis provides basis for further investigating on driving power source ofultrasonic feeding device in future.