Abstract
In a winding system, it is very important to control the tension precisely. Based on the process of rewinding and unwinding, a sensorless tension control method with PI parameters of adaptive speed controllers is proposed in this paper. According to the principle of torque balance, a tension observer is designed to replace the tension sensor, and the observed value instead of the measured value of tension is used as feedback. Then the measurement delay caused by tension sensor is reduced. For the time-variable inertia, Landau discrete-time recursive algorithm is used to estimate the inertias of the rewind and unwind motors. Moreover, the estimated inertias are used to adjust the PI parameters of the speed controllers. As the tension control system has the ability to adapt to the change of inertia, its dynamic performance is improved to some extent. In addition, the proposed sensorless tension control method is simple and easy to implement, which only uses the current and speed signals of the motors without any additional hardware needed. At last, the feasibility and effectiveness of the proposed method are verified by the experimental results.
Highlights
Tension control system is widely applied in industrial fields where high precision and productivity are required, including printing, textile, chemical fiber, and metallurgy
Besides the high price and the existing delay, the signal of the tension sensor is very weak, which is interfered by the environment, so this method cannot be applied in some special occasions
If a tension observer can be designed to replace the tension sensor and the same control performance can be obtained compared with the direct closed-loop control method, it will be of great significance in tension control field
Summary
Tension control system is widely applied in industrial fields where high precision and productivity are required, including printing, textile, chemical fiber, and metallurgy. If a tension observer can be designed to replace the tension sensor and the same control performance can be obtained compared with the direct closed-loop control method, it will be of great significance in tension control field. Mathematical Problems in Engineering in continuous strip processing line, including the acceleration torque As this scheme directly controls torque current of motors, faster dynamic response can be obtained in case of linear speed acceleration or deceleration [13, 14]. In [15], a sliding-mode (SM) feedback linearization control system is designed for a multimotor web-winding system This method consists of a SM velocity controller and two SM tension controllers. The proposed tension estimation and fault diagnosis method is applied to a real continuous annealing process line in a steel-making company. A series of comparative experiments are conducted, and the feasibility and effectiveness of the proposed method are verified by the experimental results
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