描述

DAI05

　在計算機控制系統(tǒng)的現(xiàn)場往往有許多強電設(shè)備，它們在起動和生產(chǎn)過程中將產(chǎn)生干擾電磁場，另外還有來自空間傳播的電磁波和雷電干擾，以及高壓輸電線周圍交變磁場的影響等。干擾傳播途徑主要有：電場耦合、磁場耦合、公共阻抗耦合。

電場耦合：又稱靜電耦合，是通過電容耦合竄入其它線路的。兩根導(dǎo)線之間會構(gòu)成分布電容，印制電路板上各印制電線之間、變壓器線匝之間和繞線之間都會構(gòu)成分布電容。這些分布電容的存在可以為干擾信號提供干擾電抗通道，電場干擾就可以由該通道竄入系統(tǒng)，形成干擾。

磁場耦合：在任何載流導(dǎo)體周圍都會產(chǎn)生磁場，當電流變化時會產(chǎn)生交變磁場，該磁場必然會在其周圍的閉合回路中產(chǎn)生感應(yīng)電勢引起干擾，它是通過導(dǎo)體間互感耦合進來的。在設(shè)備內(nèi)部，線圈或變壓器的漏磁也會引起干擾；在設(shè)備外部，平行架設(shè)的兩根導(dǎo)線也會產(chǎn)生干擾。電磁輻射會造成磁場耦合干擾，如高頻電流流過導(dǎo)體時，在該導(dǎo)體周圍便產(chǎn)生了向空間傳播的電磁波。這些干擾極易通過電源線和長信號線耦合到計算機中。另外，長線干擾具有天線效應(yīng)，即能夠輻射干擾波和接受干擾波。

公共阻抗耦合：是由于電流流過回路間公共阻抗，使得一個回路的電流所產(chǎn)生的電壓降影響到另一回路。在計算機控制系統(tǒng)中，普遍存在公共耦合阻抗，例如，電源引線、印刷電路板上的地和公共電源線、匯流排等。這些匯流排都都具有一定的阻抗，對于多回路來講，就是公共耦合阻抗。當流過較大的數(shù)字信號電流時，其作用就像是一根天線，將干擾引入到各回路中。同時，各回流條之間具有電容，數(shù)字脈沖可以通過這個電容耦合過來。印制板上的地，實質(zhì)上就是公共回流線，由于它仍然具有一定的電阻，各電路之間就通過它產(chǎn)生信號耦合。

產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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