電容式接近(jìn)開關
工作(zuò)原(yuán)理
電感式接近開關屬於一種有開關量輸出的(de)位置傳感器,它(tā)由LC高頻振蕩器和放大處理電路組成,利用(yòng)金屬物體在(zài)接(jiē)近這個能(néng)產生電磁場的(de)振蕩感應頭時,使物體內部產(chǎn)生渦流。這個渦流反作用(yòng)於(yú)接近開關,使接(jiē)近(jìn)開(kāi)關振(zhèn)蕩能力衰減,內部電路的參數發生變化,由此識別出有(yǒu)無金屬物(wù)體接近(jìn),進而(ér)控製開關(guān)的通或斷(duàn)。這種接(jiē)近(jìn)開關(guān)所(suǒ)能檢測的物(wù)體必須是金屬導電體
電容式接近開關係列
電感式接近開(kāi)關由(yóu)三大部(bù)分組成:振蕩(dàng)器、開關電路及放大輸出電路。振(zhèn)蕩器產(chǎn)生(shēng)一(yī)個(gè)變交磁場,並 達到感應距離(lí)時,在(zài)金屬(shǔ)目標內產(chǎn)生渦流,從而導致振蕩衰減(jiǎn),以至停(tíng)振(zhèn)。
振蕩器振蕩及停振的(de)變化被後級放大電路處理並(bìng)轉換成開關信號,觸發驅動控製器件,從而達到非接觸式(shì)之檢測目的。
目標離傳感器(qì)越近,線(xiàn)圈內的阻尼就越大,阻尼越大,傳感(gǎn)器(qì)振蕩(dàng)器的電流(liú)越(yuè)小
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