繼電器是一種靠電磁感應(yīng)工作的自動(dòng)化電器開關(guān),。

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(yīng)用于自動(dòng)控制電

路中,，它實(shí)際上是用較小的電流去控制較大電流的一種“自動(dòng)開關(guān)"。故在電路中起著自動(dòng)調(diào)節(jié),、安全保護(hù),、轉(zhuǎn)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(diǎn)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(huì)流過一定

的電流,，從而產(chǎn)生電磁效應(yīng),，銜鐵就會(huì)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(dòng)銜鐵的動(dòng)觸點(diǎn)

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

動(dòng)觸點(diǎn)與原來的靜觸點(diǎn)(常閉觸點(diǎn))吸合,。這樣吸合、釋放,，從而達(dá)到了在電路中的導(dǎo)通,、切斷的目的,。對(duì)于繼電器的

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

的靜觸點(diǎn)稱為“常閉觸點(diǎn)",。

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