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直流電流與交流電流相比較，不存在周期性的電流數(shù)值過(guò)零點(diǎn)，因此，傳統(tǒng)接觸器開(kāi)斷電路時(shí)，觸頭之間產(chǎn)生的電弧較為強(qiáng)烈，燃弧時(shí)間也比較長(zhǎng)，以便充分釋放電路中剩余的能量。電弧的燃燒產(chǎn)生高溫和強(qiáng)光，對(duì)觸頭表面有嚴(yán)重的燒蝕作用，觸頭材料在多次開(kāi)斷之后逐漸流失，觸頭電磨損嚴(yán)重時(shí)，導(dǎo)致直流接觸器報(bào)廢，不能開(kāi)斷電路。 [1]
電力電子技術(shù)得以迅猛發(fā)展，人們將電力電子元件應(yīng)用到直流接觸器中，巧妙的創(chuàng)造出一種混合式直流接觸器，使得直流接觸器向智能化、可控化邁進(jìn)了新的一步。這種混合式接觸器利用傳統(tǒng)直流接觸器在閉合導(dǎo)通狀態(tài)下觸頭接觸電阻小、導(dǎo)通壓降小的優(yōu)點(diǎn)，將由反并聯(lián)晶閘管和控制模塊單元共同組成的無(wú)觸點(diǎn)開(kāi)關(guān)并聯(lián)在傳統(tǒng)直流接觸器觸頭上。這種無(wú)觸點(diǎn)的電力電子開(kāi)關(guān)分?jǐn)嚯娐窌r(shí)不產(chǎn)生電弧，這就避免了傳統(tǒng)接觸器中電弧對(duì)觸頭材料的電磨損，也就大大增加了觸頭的使用壽命和可靠性。 [1]
直流接觸器永磁機(jī)構(gòu)
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直流接觸器作為應(yīng)用廣泛的電氣開(kāi)關(guān)之一，其生產(chǎn)和需求數(shù)量巨大，在正常使用過(guò)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(guò)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(lái)，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(chēng)之為“電磁操動(dòng)，永磁保持，電子控制”。在分、合閘運(yùn)動(dòng)過(guò)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(guò)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(wú)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]
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另一半是活動(dòng)鐵芯，構(gòu)造和固定鐵芯一樣，用以帶動(dòng)主接點(diǎn)和輔助接點(diǎn)的閉合斷開(kāi)。
20A以上的接觸器加有滅弧罩，利用電路斷開(kāi)時(shí)產(chǎn)生的電磁力，快速拉斷電弧，保護(hù)接點(diǎn)。
接觸器可高頻率操作，做為電源開(kāi)啟與切斷控制時(shí)﹐高操作頻率可達(dá)每小時(shí)1200次。
接觸器的使用壽命很高，機(jī)械壽命通常為數(shù)百萬(wàn)次至一千萬(wàn)次，電壽命一般則為數(shù)十萬(wàn)次至數(shù)百萬(wàn)次。
技術(shù)發(fā)展
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電路的裝置，所以經(jīng)常運(yùn)用于電動(dòng)機(jī)做為控制對(duì)象﹐也可用作控制工廠設(shè)備﹑電熱器﹑工作母機(jī)和各樣電力機(jī)組等電力負(fù)載，接觸器不僅能接通和切斷電路，而且還具有低電壓釋放保護(hù)作用。接觸器控制容量大，適用于頻繁操作和遠(yuǎn)距離控制,是自動(dòng)控制系統(tǒng)中的重要元件之一。
在工業(yè)電氣中，接觸器的型號(hào)很多，工作電流在5A-1000A的不等，其用處相當(dāng)廣泛
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交流接觸器利用主接點(diǎn)來(lái)控制電路，
用輔助接點(diǎn)來(lái)導(dǎo)通控制回路。
主接點(diǎn)一般是常開(kāi)接點(diǎn)，而輔助接點(diǎn)常有兩對(duì)常開(kāi)接點(diǎn)和常閉接點(diǎn)，小型的接觸器也經(jīng)常作為中間繼電器配合主電路使用。
交流接觸器的接點(diǎn)，由銀鎢合金制成，具有良好的導(dǎo)電性和耐高溫?zé)g性。
交流接觸器動(dòng)作的動(dòng)力源于交流通過(guò)帶鐵芯線圈產(chǎn)生的磁場(chǎng)，電磁鐵芯由兩個(gè)「山」字形的幼硅鋼片疊成，其中一個(gè)固定鐵芯，套有線圈，工作電壓可多種選擇。為了使磁力穩(wěn)定，鐵芯的吸合面加上短路環(huán)。交流接觸器在失電后，依靠彈簧復(fù)位。
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