| Tension control is known to be the most important system in every winding machine. Materials such as paper,plastic film,textile,rubber flake or thin steel,are unwound from or wound onto the machine by the control of specific tension.The tension change affects the processed material greatly.Extreme big tension will lead the distortion or break of the material while extreme small tension makes the stress distortion layer by layer and affects the processing quality;frequent tension change will lead the line speed and the degree of tightness change,and it will also bring the low productivity of qualified products.Therefore the tension control is the key point in the high precision winding system.First, the article introduces the development of tension control system domestic and overseas, analyzes the origin and functions of tension, classifies the familiar tension control methods and compared the characteristic of each method.Second,this article introduces the slitting steel line based on eurotherm 590 driver, including production flow, basic electrical equipments, the automation control design of whole line,the mainly performance of the control system,etc.Then, this article analyzes the basic theory of indirectly constant tension control and the three ways to realize indirectly constant tension control,and the design of the indirect constant tension control system, and sets up different mathematic model according to the different work ways of the control system,then simulates it with simulink, and proves its ture.the realization of soft sensing of actual tension in the tension control mode of the indirectly constant tension control system is also detaily presented, and simulates it with simulink, which proved to be truly and workably.At last, this article introduces the control theory and the realization of application composed with intenal function blocks of eurotherm 590 driver which use the indirectly constant tension maximal moment of force method.
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