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    --- title: 實驗記錄-11 tags: 實驗記錄 --- # 實驗記錄-11 > 繼電器 relay ### 原理 一般由鐵芯、線圈、銜鐵、接點簧片等組成的。只要在線圈兩端加上一定的電壓,線圈中就會流過一定的電流,從而產生電磁效應,銜鐵就會在電磁力吸引的作用下克服返回彈簧的拉力吸向鐵芯,從而帶動銜鐵的動接點與靜接點(常開接點)吸合。當線圈斷電後,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,使動接點與原來的靜接點(常閉接點)釋放。這樣吸合、釋放,從而達到了在電路中的導通、切斷的目的。 - 在沒有訊號提供時,內部的簧片會在上方,這時候「常閉」與「公共端」是通路,「常開」和「公共端」是斷路。 - 當電磁鐵透過訊號通電,就會將內部的簧片往下吸附,此時「常閉」與「公共端」變成斷路,「常開」和「公共端」變成通路 ![](https://i.imgur.com/XAUPQbL.png) ![](https://i.imgur.com/LE0xNva.png) ### 作用 * 隔離功能:在繼電器的輸入部分和輸出部分之間,還有對輸入量進行耦合隔離,功能處理和對輸出部分進行驅動的中間機構(驅動部分)。 * 擴大控制範圍:多接點繼電器控制信號達到某一定值時,可以按接點組的不同形式,同時換接、開斷、接通多路電路。 * 放大:靈敏型繼電器、中間繼電器等,用一個很微小的控制量,可以控制很大功率的電路。 * 綜合信號:當多個控制信號按規定的形式輸入多繞組繼電器時,經過比較綜合,達到預定的控制效果。 * 自動、遙控、監測:自動裝置上的繼電器與其他電器一起,可以組成程序控制線路,從而實現自動化運行 ![](https://i.imgur.com/KCiuLiS.png)

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