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1.以計(jì)算機(jī)作為上位機(jī)，A/D 采樣板或 DSP 作為下位機(jī)的觸頭參數(shù)自動(dòng)檢測(cè)系統(tǒng)
采用自行研制的繼電器電壽命計(jì)算機(jī)檢測(cè)與控制裝置在繼電器電壽命試驗(yàn)的開始、中間、結(jié)尾三個(gè)不同的時(shí)段對(duì)過電壓信號(hào)進(jìn)行采集。采用自行研制的A/D采樣板或以DSP為核心的高速數(shù)據(jù)采集卡，對(duì)觸頭接觸壓降、斷開觸頭間電壓、主回路電流等觸頭電氣參數(shù)進(jìn)行采樣。控制部分采用數(shù)字I/O板通過控制固態(tài)繼電器來驅(qū)動(dòng)接觸器或繼電器通斷。軟件方面采用VB編程，中斷處理程序?qū)崿F(xiàn)數(shù)據(jù)采樣、邏輯控制等功能。文獻(xiàn)中的數(shù)據(jù)處理方面主要針對(duì)電網(wǎng)頻率、功率因數(shù)的計(jì)算。通過對(duì)采集到的電壓信號(hào)的分析，利用快速傅里葉變換將時(shí)域信號(hào)變換為頻域信號(hào)，將變換的結(jié)果分別放在實(shí)部與虛部的數(shù)組中，出現(xiàn)峰值的位置為電網(wǎng)頻率，利用公式計(jì)算出電網(wǎng)頻率。將采集到的數(shù)據(jù)進(jìn)行傅里葉變換，將時(shí)域信號(hào)變換為頻域信號(hào)，從而計(jì)算出電壓和電流的相位，進(jìn)而求得功率因數(shù)。
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直流接觸器作為應(yīng)用廣泛的電氣開關(guān)之一，其生產(chǎn)和需求數(shù)量巨大，在正常使用過程中，電磁鐵線圈一直通電工作，產(chǎn)生電磁吸力，保證鐵芯和銜鐵吸合，帶動(dòng)動(dòng)、靜觸頭閉合，接通電路。在上述過程中，線圈本身存在電阻，持續(xù)消耗電能，這是直流接觸器主要的使用成本之一，浪費(fèi)了大量的能源和財(cái)產(chǎn)，因此，如何降低直流接觸器的工作耗能，是研究直流接觸器的關(guān)鍵點(diǎn)和重難點(diǎn)。直流接觸器永磁操動(dòng)機(jī)構(gòu)是一種在傳統(tǒng)直流接觸器電磁操動(dòng)機(jī)構(gòu)基礎(chǔ)上發(fā)展而來，將電磁操動(dòng)機(jī)構(gòu)和永磁鐵相結(jié)合的混合型操動(dòng)機(jī)構(gòu)，不單單使用原有的電磁吸力和彈簧反力作為鐵心吸合與分離的動(dòng)力，而是加入了永磁鐵對(duì)鐵心的吸引力，采用儲(chǔ)能電容充放電提供合閘、分閘電力，通常稱之為“電磁操動(dòng)，永磁保持，電子控制”。在分、合閘運(yùn)動(dòng)過程中，電磁吸力，永磁吸力與彈簧作用力共同作用，在穩(wěn)定工作過程中，采用永磁吸力代替之前的電磁吸力，保持銜鐵與鐵芯心的吸合狀態(tài)。一則，永磁操動(dòng)機(jī)構(gòu)大量節(jié)約了保持線圈的電能消耗，環(huán)保節(jié)能。二則，永磁體保持吸合與電磁吸合相比，噪音低，無污染。三則，永磁操動(dòng)機(jī)構(gòu)剔除了電磁機(jī)構(gòu)中一系列復(fù)雜繁瑣鎖扣保護(hù)裝置，大大提高了接觸器操動(dòng)機(jī)構(gòu)的工作可靠性，降低了生產(chǎn)工序和成本，減小了接觸器的體積。 [1] 3SU10004BP610AA0ZY11
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