Application of frequency inverter on cantilever single winch

Introduction to cantilever single winch process

 

Because it is mainly used for stranding wire cores with high precision requirements, the control process of the system has the following requirements:
1. The frequency converter must have extremely high speed stabilization accuracy requirements, because the formation of the twist length depends on the speed difference between the bow and the take-up;
2. The frequency converter must have extremely high dynamic acceleration and deceleration characteristics to ensure stable twisting distance during acceleration and deceleration;
3. The PLC program requires complex calculations of the twist length formation principle. Even if the winding diameter changes, the linear speed of the system must be maintained constant.

 

Control scheme
1. Encoders are installed on the output shafts of the bow motor and take-up motor, and the encoder signals are connected to the frequency converter, using closed-loop vector mode to meet the system's requirements for steady speed accuracy;
2. Through PLC programming, the calculation of the twist length without differential speed is realized to correct the operating frequency of the take-up motor in real time to maintain the constant line speed of the reel during the process from small to large, thus ensuring the stability of the twist length.

 

Advantages of using this control scheme:
1. Using closed-loop vector mode, its speed stabilization accuracy is significantly better than ordinary inverter control systems, and it achieves high torque output at low frequency;
2. It eliminates the need for complex and expensive planetary differentials, greatly reducing mechanical costs and giving it a competitive advantage;
3. The logic control and operation of the system are mainly realized by PLC, and the parameter setting of the frequency converter is very simplified.