本文選題：浪涌負荷 + 銀氧化錫觸點��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：觸點是低壓電器內(nèi)完成信號導(dǎo)通和分斷功能的直接執(zhí)行部分,其在浪涌負荷條件下電性能的加速退化及誘發(fā)的動熔焊失效現(xiàn)象已成為影響電器壽命和可靠性的關(guān)鍵。作為低壓電器領(lǐng)域用途最廣、用量最大的貴金屬功能材料,銀氧化錫在浪涌負荷條件下的電性能和抗浪涌能力一直受到多方關(guān)注。本文以開發(fā)的新型觸點材料電性能模擬實驗系統(tǒng)為基礎(chǔ),進而實驗研究了浪涌負荷條件下銀氧化錫觸點材料電性能基本特征、退化過程和熔焊失效物理機制。首先,設(shè)計并實現(xiàn)了一種新型兩工位觸點材料電性能模擬實驗系統(tǒng)。通過設(shè)計的機械機構(gòu)實現(xiàn)了推桿作用點、空程、超程和觸點開距等機械參數(shù)的調(diào)節(jié);以電磁鐵實現(xiàn)觸點分合運動的模擬;開發(fā)的硬件測試電路實現(xiàn)了觸點力和電參數(shù)的同步實時測量;基于LabVIEW開發(fā)的操作軟件實現(xiàn)了回跳時間、回跳能量、燃弧能量等電性能綜合參數(shù)的計算、顯示和存儲。其次,結(jié)合容性負載條件下觸點閉合過程和分斷過程的觸點電壓和觸點電流的典型波形,對實驗電路和典型波形進行了理論分析,建立了電路暫態(tài)過程的數(shù)學(xué)模型;進而分析了浪涌電流峰值、浪涌時間等參數(shù)對觸點分合過程電氣特性的影響。接著,實驗研究了耐久性電壽命實驗過程中銀氧化錫觸點回跳能量、靜壓力、燃弧能量等電性能敏感參數(shù)的退化過程,總結(jié)了各電性能敏感參數(shù)的退化規(guī)律,分析了其發(fā)生退化的原因和物理機制。最后,改變負載性質(zhì)、負載電容和觸點開距等因素,實驗研究了銀氧化錫觸點動熔焊失效現(xiàn)象,總結(jié)歸納了觸點發(fā)生動熔焊失效時電性能敏感參數(shù)的主要特征表現(xiàn),結(jié)合觸點表面微觀形貌特征與元素分布狀態(tài),闡述了觸點發(fā)生動熔焊的物理過程和失效機理。本研究可為觸點材料電性能的科學(xué)評價與優(yōu)化改進提供實驗手段,對于低壓電器的長壽命設(shè)計和接觸失效分析亦具有實用價值。
[Abstract]:The contact is the direct executive part of the signal conduction and breaking function in the low voltage electrical apparatus. The accelerated degradation of electrical performance and the induced dynamic welding failure under surge load have become the key to affect the life and reliability of electrical apparatus. As the most widely used and used noble metal functional materials in the field of low-voltage electrical appliances, the electrical properties and anti-surge ability of silver tin oxide under surge load have been paid much attention to. Based on a new type of contact material electrical performance simulation experimental system, the basic characteristics of electrical properties, degradation process and the physical mechanism of welding failure of silver tin oxide contact materials under surge load are studied experimentally in this paper. First, a new two-position contact material electrical performance simulation system is designed and implemented. Through the designed mechanical mechanism, the mechanical parameters such as the action point of the push rod, the space range, the overrun range and the contact opening distance are adjusted, and the electromagnet is used to simulate the movement of the contact points. The hardware test circuit realizes the synchronous real-time measurement of contact force and electrical parameters, and the operation software based on LabVIEW realizes the calculation, display and storage of the comprehensive parameters of electrical performance, such as rebound time, rebound energy, arc burning energy, etc. Secondly, combined with the typical waveform of contact voltage and current in capacitive load, the experimental circuit and typical waveform are analyzed theoretically, and the mathematical model of circuit transient process is established. Furthermore, the influence of peak surge current and surge time on the electrical characteristics of the contact is analyzed. Then, the degradation process of sensitive parameters of silver tin oxide contacts, such as rebound energy, static pressure, arc energy and so on, is studied, and the degradation laws of these sensitive parameters are summarized. The causes and physical mechanism of its degradation are analyzed. Finally, by changing the load property, load capacitance and contact distance, the failure phenomenon of silver tin oxide contact dynamic fusion welding is studied experimentally, and the main characteristics of electrical property sensitive parameters when contact failure occurs are summarized. The physical process and failure mechanism of contact dynamic fusion welding are described in combination with the microcosmic morphology of contact surface and the distribution of elements. This study can provide experimental means for scientific evaluation and optimization improvement of electrical properties of contact materials, and also has practical value for long life design and contact failure analysis of low voltage electrical appliances.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM24

【參考文獻】

相關(guān)期刊論文 前10條

1 任萬濱;韋健民;;觸頭材料電接觸性能的先進測評技術(shù)[J];電器與能效管理技術(shù);2016年15期

2 余志堂;;繼電器在電氣工程自動化低壓電器中的應(yīng)用[J];技術(shù)與市場;2016年05期

3 吳春萍;易丹青;翁桅;李素華;周孑民;;合金元素對Ag/MeO電接觸材料電弧侵蝕形貌的影（英文）[J];Transactions of Nonferrous Metals Society of China;2016年01期

4 謝繼峰;李國偉;劉立強;顏小芳;李素華;柏小平;;AgMo電觸頭材料的制備及性能研究[J];粉末冶金工業(yè);2014年02期

5 謝明;王松;付作鑫;王塞北;沈月;張吉明;;AgSnO_2電接觸材料研究概述[J];電工材料;2013年02期

6 黃姣英;胡振益;高成;武榮榮;;軍用電磁繼電器失效分析研究[J];現(xiàn)代電子技術(shù);2013年10期

7 劉杜;李震彪;李晨;田蕓;許光達;;電觸頭通斷過程機電特性試驗的研究[J];低壓電器;2013年07期

8 喬秀清;申乾宏;陳樂生;賀慶;樊先平;楊輝;;AgSnO_2電接觸材料的研究進展[J];材料導(dǎo)報;2013年01期

9 吳春萍;易丹青;許燦輝;周孑民;甕桅;;銀基合金研究現(xiàn)狀與發(fā)展趨勢[J];電工材料;2012年02期

10 山岸宣行;戴惠芬;李業(yè)建;;電觸頭材料[J];電工材料;2011年03期

相關(guān)博士學(xué)位論文 前1條

1 吳春萍;Ag-Sn合金氧化機理與Ag-SnO_2材料的高溫塑性變形行為研究[D];中南大學(xué);2009年

相關(guān)碩士學(xué)位論文 前1條

1 金建炳;電磁繼電器觸頭動熔焊特性的模擬實驗研究[D];哈爾濱工業(yè)大學(xué);2015年

，

本文編號：2111496