本文選題：超聲換能器 + 串聯(lián)諧振　； 參考：《南京理工大學》2014年碩士論文

【摘要】：現(xiàn)代機械加工中超聲波塑料焊接的應(yīng)用越來越廣泛,正成為一項非常有前景的加工技術(shù)。實現(xiàn)高質(zhì)量、高效率的超聲波焊接加工,需要高質(zhì)量的超聲逆變電源,而尋找正確的工作頻率是高效率超聲電源的關(guān)鍵步驟。 超聲換能器的諧振頻率包括串聯(lián)諧振頻率和并聯(lián)諧振頻率,其中串聯(lián)諧振頻率又稱為機械諧振頻率,是換能器的最佳工作頻率。在該頻率上,轉(zhuǎn)換效率最高。這就要求超聲逆變電源能工作在該頻率上。 論文在仔細分析超聲換能器的機電特性基礎(chǔ)上,對諧振電路的工作特性進行了研究,旨在研制一種高效率、高質(zhì)量的逆變電源。主要內(nèi)容包括： (1)根據(jù)機械與電的等效原理,分析及計算超聲換能器的等效電路特性和特性阻抗,所獲結(jié)論是：超聲換能器可以利用匹配電感平衡自身的體電容。 (2)通過電路仿真的結(jié)果,證實匹配電感不僅可以平衡換能器的體電容,還可以利用串聯(lián)諧振方式提升工作電壓,使得振動的效果更好。 (3)對超聲逆變電源的控制方式進行了分析,提出了自己的控制方式。利用手動調(diào)節(jié)電位器控制工作頻率,觀察換能器上的電流電壓波形以尋找最佳頻率點,確定工作頻率。 (4)對可控整流環(huán)節(jié)及DC/AC逆變環(huán)節(jié)的電路設(shè)計進行了詳細介紹,并對所需要的關(guān)鍵器件例如濾波電感、匹配電感、主變壓器的設(shè)計制作作詳細說明。 (5)試驗中,重點介紹了換能器的串聯(lián)諧振頻率的尋找方法。通過試驗,證實了結(jié)果滿足設(shè)計要求。 經(jīng)過實際帶載工作,證明了設(shè)計方案可靠、適應(yīng)性強、轉(zhuǎn)換效率高,因此,該設(shè)計方案具有良好的實用和推廣價值。
[Abstract]:Ultrasonic plastic welding is more and more widely used in modern machining, and is becoming a very promising processing technology. In order to realize high quality and high efficiency ultrasonic welding, high quality ultrasonic inverter power supply is needed, and finding the correct working frequency is the key step of high efficiency ultrasonic power supply. The resonant frequency of ultrasonic transducer includes series resonant frequency and parallel resonant frequency. The series resonant frequency, also called mechanical resonance frequency, is the best working frequency of the transducer. At this frequency, the conversion efficiency is the highest. This requires the ultrasonic inverter to work at this frequency. Based on the detailed analysis of the electromechanical characteristics of ultrasonic transducer, the working characteristics of resonant circuit are studied in order to develop a high efficiency and high quality inverter power supply. The main elements include: 1) according to the principle of mechanical and electrical equivalence, the equivalent circuit characteristics and characteristic impedance of ultrasonic transducer are analyzed and calculated. The conclusion is that the ultrasonic transducer can balance its volume capacitance by matching inductance. The results of circuit simulation show that the matching inductor can not only balance the volume capacitance of the transducer, but also enhance the working voltage by using the series resonance mode, which makes the vibration effect better. The control mode of ultrasonic inverter power supply is analyzed and its own control mode is put forward. By manually adjusting the working frequency of the potentiometer, the current and voltage waveforms on the transducer are observed in order to find the best frequency point and determine the working frequency. The circuit design of controllable rectifier and DC/AC inverter is introduced in detail. The key devices such as filter inductor, matched inductor and main transformer are described in detail. In the experiment, the searching method of the series resonant frequency of the transducer is introduced emphatically. The experimental results show that the results meet the design requirements. It is proved that the design scheme is reliable, adaptable and conversion efficiency is high. Therefore, the design scheme has good practical and popularizing value.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB552

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