利用磁粉制动器的励磁电流与制动力矩成线性关系这一特性，设计了闭环张力控制系统。
Utilizing the linearity peculiarity of the exciting current of magnetic powder brake and brake moment, the closed loop control system is designed.
每个拆卷机上，膜都是包裹在负载单元式卷轴上的，这样就能监测膜的张力，为电自动的闭环张力控制器提供反馈的信号。
At each unwinder the film wraps around a load-cell-mounted roller, which monitors the film tension, providing the feedback signal for electronic automatic closed-loop tension control.
为实现翻转过程中薄膜的恒线速度、恒张力控制，采用转速和张力的闭环控制，将线速度作为主控制变量，进行综合控制。
In order to carry out the constant line speed and the constant tension for the rolling of plastic films during reversal, loop control of the rotating speeds and the tension is adopted.
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