Tension Control: Open-Loop Torque Control in Material Unwinding Process

This paper analyzes the problem of tension control in the processes of unwinding, rewinding, and winding materials, addressing how to implement such control in an open-loop system without the commonly used dancer rolls. It describes the theoretical and mathematical foundations of material tension control. An example problem of tension control on a real control object has been solved. An algorithm utilizing the torque control method in an open-loop system, which uses only servo drives to manage tension, is presented. This algorithm allows for increased process speed by unwinding two material rolls simultaneously, a capability that was not possible with single dancer roll control. Additionally, an algorithm for measuring the moment of inertia of material rolls using servo drives is discussed. The necessary measurements for the control algorithm to function effectively have been performed. The article concludes by presenting the results.