翻转过程薄膜牵引和卷取恒线速度及恒张力控制系统

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。在给定的线速度下，协调控制牵引电机和卷取电机的转速，实现卷取电机转速跟随牵引电机的转速变化。用于牵引和卷取的异步电机采用矢量控制变频调速。张力控制采用FX2N的PID功能指令。

Control System of Constant Line Speed and Constant Tension for Traction and Rolling of Plastic Films during Reversal

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.The line speed serves as the main control variable in the integrative control.Concretely,the rotating speeds of the traction motor and the rolling motor are harmoniously controlled in the precondition of the fixed line speed.The rotating speed of the rolling motor changes along with the rotating speed of the traction motor.The variable frequency regulating speed technique on the flux vector control is chosen for the timing of the traction motor and rolling motor.The control of the tension is carried out by the PID functional instruction of FX 2N.