kissling MN81-061-204 開(kāi)關(guān)
kissling MN81-061-204 開(kāi)關(guān)
1. 接近開(kāi)關(guān)是無(wú)觸點(diǎn)開(kāi)關(guān),壽命較長(zhǎng),適用于“通過(guò)信號(hào)"。
2. 限位開(kāi)關(guān)也叫行程開(kāi)關(guān)是有觸點(diǎn)開(kāi)關(guān),適合單方向位置檢測(cè),德國(guó)kissling行程開(kāi)關(guān),由于有觸點(diǎn),相對(duì)壽命要短。
3. 行程開(kāi)關(guān)又稱(chēng)限位開(kāi)關(guān),行程開(kāi)關(guān)和限位開(kāi)關(guān)都是位置開(kāi)關(guān),但是行程開(kāi)關(guān)可以檢測(cè)行程,可作為輸入信號(hào)控制電路在一定距離動(dòng)作。區(qū)別于限位開(kāi)關(guān)檢測(cè)---位置的信號(hào),起停止、保護(hù)的作用。
直動(dòng)式行程開(kāi)關(guān)
動(dòng)作原理同按鈕類(lèi)似,所不同的是:一個(gè)是手動(dòng),另一個(gè)則由運(yùn)動(dòng)部件的撞塊碰撞。當(dāng)外界運(yùn)動(dòng)部件上的撞塊碰壓按鈕使其觸頭動(dòng)作,當(dāng)運(yùn)動(dòng)部件離開(kāi)后,在彈簧作用下,其觸頭自動(dòng)復(fù)位。
直動(dòng)式行程開(kāi)關(guān)組成
1:推桿 2&4:彈簧 3:動(dòng)斷觸點(diǎn) 5:動(dòng)合觸點(diǎn)
常規(guī)國(guó)產(chǎn)行程開(kāi)關(guān):
常規(guī)行程開(kāi)關(guān)中l(wèi)x19系列中的lx19-001/111,lxk3系列中的lxk3-20s/t,jlxk1系列jlxk1-111/411/511l具代表力,這些產(chǎn)品有結(jié)構(gòu)簡(jiǎn)單、功能實(shí)用、價(jià)格低廉的優(yōu)勢(shì)---廣大使用者的---。
對(duì)于開(kāi)關(guān)電源,開(kāi)關(guān)變壓器的工作原理與普通變壓器的工作原理是不同的。普通變壓器輸入的交流電壓或電流的正、負(fù)半周波形都是對(duì)稱(chēng)的,并且輸入電壓和電流波形一般都是連續(xù)的,在一個(gè)周期之內(nèi),輸入電壓和電流的平均值等于0,這是普通變壓器工作原理的基本特點(diǎn);而開(kāi)關(guān)變壓器一般都是工作于開(kāi)關(guān)狀態(tài),其輸入電壓或電流一般都不是連續(xù)的,而是斷續(xù)的,輸入電壓或電流在個(gè)周期之內(nèi)的平均值大多數(shù)都不等于0,因此,開(kāi)關(guān)變壓器也稱(chēng)為脈沖變壓器,這是開(kāi)關(guān)變壓器與普通變壓器在工作原理方面的最大區(qū)別。
除此之外,開(kāi)關(guān)變壓器對(duì)于輸入電壓來(lái)說(shuō),有單激式和雙激式之分:對(duì)于輸出電壓來(lái)說(shuō),又有正激式和反激式之分。單激式和雙激式開(kāi)關(guān)電源,或正激式和反激式開(kāi)關(guān)電源,它們使用的開(kāi)關(guān)變壓器,在工作原理方面也有很大的不同。
當(dāng)開(kāi)關(guān)變壓器的輸入電壓為直流脈沖電壓時(shí),稱(chēng)為單極性脈沖輸入,這種單極性脈沖輸入的開(kāi)關(guān)電源稱(chēng)為單激式變壓器開(kāi)關(guān)電源:當(dāng)開(kāi)關(guān)變壓器的輸入電壓為正、負(fù)交替的脈沖電壓時(shí),稱(chēng)為雙極性脈沖輸入,這種雙極性脈沖輸入的開(kāi)關(guān)電源稱(chēng)為雙激式變壓器開(kāi)關(guān)電源;當(dāng)變壓器的初級(jí)線(xiàn)圈正在被直流脈沖電壓激勵(lì)時(shí),變壓器的次級(jí)線(xiàn)圈正好有功率輸出,這種開(kāi)關(guān)電源稱(chēng)為正激式變壓器開(kāi)關(guān)電源;當(dāng)變壓器的初級(jí)線(xiàn)圈正好被直流脈沖電壓激勵(lì)時(shí),變壓器的次級(jí)線(xiàn)圈沒(méi)有向負(fù)載提供功率輸出,而僅在變壓器初級(jí)線(xiàn)圈的激勵(lì)電壓被關(guān)斷后才向負(fù)載提供功率輸出,這種變壓器開(kāi)關(guān)電源稱(chēng)為反激式開(kāi)關(guān)電源。
設(shè)開(kāi)關(guān)變壓器鐵芯的截面為S,當(dāng)幅度為U、寬度為t的矩形脈沖電壓施加到開(kāi)關(guān)變壓器的初級(jí)線(xiàn)圈上時(shí),在開(kāi)關(guān)變壓器的初級(jí)線(xiàn)圈中就有勵(lì)磁電流流過(guò):同時(shí),在開(kāi)關(guān)變壓器的鐵芯中就會(huì)產(chǎn)生磁場(chǎng),變壓器的鐵芯就會(huì)被磁化,在磁場(chǎng)強(qiáng)度為H的磁場(chǎng)作用下又會(huì)產(chǎn)生磁感應(yīng)強(qiáng)度為B的磁力線(xiàn)通量,簡(jiǎn)稱(chēng)磁通,用""表示:磁感應(yīng)強(qiáng)度B或磁通p受磁場(chǎng)強(qiáng)度H的作用而發(fā)生變化的過(guò)程,稱(chēng)為磁化過(guò)程。所謂的勵(lì)磁電流,就是讓變壓器鐵芯充磁和消磁的電流。
根據(jù)法拉第電磁感應(yīng)定理,電感線(xiàn)圈中的磁場(chǎng)或磁感應(yīng)強(qiáng)度發(fā)生變化時(shí),將在線(xiàn)圈中產(chǎn)生
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