電容(róng)式接近開(kāi)關
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工作原理
電感(gǎn)式接近開(kāi)關屬於(yú)一種有(yǒu)開關(guān)量輸出的位置(zhì)傳感器,它由LC高頻振蕩器和放大處理電路(lù)組成,利用(yòng)金屬物體在(zài)接近這個能產生電磁場的(de)振蕩感應頭時,使(shǐ)物體內部產生渦流(liú)。這(zhè)個渦流反作用於(yú)接(jiē)近開(kāi)關,使接近開(kāi)關振蕩能力衰減,內部電路的參(cān)數發生變化,由此識別出有無金屬物體接近,進而控製開關的(de)通或斷。這種接近開關(guān)所能檢測的物體(tǐ)必須是金屬導(dǎo)電體
電容式接近開關(guān)係(xì)列
電感式接近開(kāi)關由三(sān)大部分(fèn)組成(chéng):振蕩器、開(kāi)關(guān)電路及放大(dà)輸出電(diàn)路。振蕩器產生一(yī)個變交磁場,並 達(dá)到感應距(jù)離時,在金(jīn)屬目標(biāo)內產生渦流,從(cóng)而導致振蕩衰減(jiǎn),以(yǐ)至停振。
振蕩器振蕩及停(tíng)振的變(biàn)化被後級放大電路處(chù)理並轉換(huàn)成開關信號(hào),觸發驅動控(kòng)製(zhì)器件,從而達到非接(jiē)觸式之檢測目(mù)的。
目標離傳感器(qì)越近,線圈內的(de)阻尼就越大,阻(zǔ)尼越(yuè)大,傳(chuán)感器振(zhèn)蕩器的電流越小(xiǎo)
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