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繼電器是一種靠電磁感應工作的自動化電器開關。

繼電器的工作原理和特性

繼電器是一種電子控制泰件，它具有控制系統(tǒng)(義稱輸入回路)和被控制系統(tǒng)(義稱輸出口路)，通常應用于自動控制電

路中，它實際上是用較小的電流去控制較大電流的一種“自動開關"。故在電路中起著自動調節(jié)、安全保護、轉換電路

等作用。

1、電磁繼電器的工作原理和特性

電磁式繼電器一般由鐵芯、線圈，銜鐵，觸點等片等組成的。只要在線圈兩端加上一定的電床，線圈中就會流過一定

的電流，從而產(chǎn)生電磁效應，銜鐵就會在電磁力吸引的作用下克服返回彈策的拉力吸向鐵芯，從而帶動銜鐵的動觸點

與靜觸點(常開觸點)吸合。當線圈斷電后，電磁的吸力也隨之消失，銜鐵就會在彈簧的反作用力返回原來的位置，使

動觸點與原來的靜觸點(常閉觸點)吸合。這樣吸合、釋放，從而達到了在電路中的導通、切斷的目的。對于繼電器的

“常開、常閉"觸點，可以這樣來區(qū)分:繼電器線圈未通電時處于斷開狀態(tài)的靜觸點，稱為“常開觸點";處于接通狀態(tài)

的靜觸點稱為“常閉觸點"。

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