Abstract:

The warp knitting machine control system is a nonlinear system at a time of change for the warp production. It is required to have fast response, high control accuracy and stability, particularly to high-speed warp knitting machine. The ststem was designed on the basis of the closed loop control of the let-off system of a warp knitting machine. The principle, method and components were introduced in this paper. The DSP digital controller is created as a warp core component of the control unit. It is showed that the beam motor speed for the next period is obtained by measuring wia a feedback roller. Besides to achieve the let-off system of real-time online adjustments, it is calculated and corrected in intelligent PID controller according to the deviation of amount of let-off. When a is made, it is concluded the system possesses the nature of high accuracy, response and stability.

Key words: warp knitting, let-lff system, closed loop control, feedback roller