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磁阻尼器又名張力控制器、張力器或制動器，是以磁場為媒介傳遞恒定扭力的裝置。磁阻尼器應用于電線電纜，光纖光纜等行業，可用于束線機，拉絲機，繞線機等機械收縮張力控制器并且具有張力控制穩定等效果。

磁阻尼器是利用磁場對在其中運動的導體的作用力獲得振動阻尼的裝置。導體（或線圈）d置于磁缸c的磁場中，c固定在基礎s上，d與振動器m剛性連接。當m作垂直運動時，導體中就會產生感應電流，運動能量就會被部分吸收，導體受到的阻尼力與速度成正比。其缺點是只能控制垂直方向的振動，由于磁場的不均勻性，阻尼系數也會因位移而變，且較大的阻尼力要求較大的磁場 

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