How is the winding speed of the dye jigger controlled?

The winding speed of the dye jigger is usually controlled by a frequency converter. The use of variable frequency speed regulation in the control of the dye jigger has the characteristics of simple configuration, clear logic and reduced cost.
The frequency converter can work in the closed-loop vector control mode. Since the dye jigger will work at a very low frequency (1-3Hz) for a long time when it is close to full roll, the use of a higher line encoder helps to improve the control performance under low speed conditions. At the same time, considering heat dissipation, a dedicated frequency conversion motor is required.
The thickness of the cloth is set through the human-machine interface (HMI) and then transmitted to the frequency converter through the programmable logic controller (PLC). The frequency converter can obtain a matching motor rotation speed based on the set line speed and the initial diameter and thickness of the cloth. When the diameter changes, the frequency converter will automatically subtract the thickness of a layer of cloth for each rotation of the roller to obtain a new diameter. Through this new diameter, the frequency converter can calculate the required matching line speed, and this cycle can ensure the constant line speed of the cloth.
The constant tension control uses the torque control function of the vector control inverter to calculate the required torque in real time according to the tension setting value, taper, compensation amount and reel diameter, thereby indirectly controlling the strip tension. This control method is suitable for high tension control at lower speeds, and the dye jigger is a typical system of this type.