The design for tension adaptive variable-structure control system of electric cable plastic wrapping process

A tension adaptive variable-structure control system was designed for constant tension of electric cable plastic wrapping automatic production process. This system contains two inner loops for current and velocity control using PI regulators; its outer loop is for tension control using model reference adaptive controller. Simulation results indicate that the adaptive variable-structure controller has better performances than classical PID control method. The system has quick speed of response and stronger robustness for constant tension of electric cable control, and improves the precision about the thickness and shapes of steel straps.