Abstract : This article mainly discusses the working principle of wire drawing machines and the application of Kangwo frequency converters in wire drawing machines. Keywords : Kangwo frequency converter, wire drawing machine, PID controller 1 Introduction Wire drawing machines are one of the main processing equipment in the wire and cable industry. They are mainly used to process copper wire into fine wires of various specifications. They generally consist of unwinding, water cooling, take-up, and wire laying parts. The electrical drive part is mainly implemented by unwinding motors, take-up motors, and wire laying motors. With the continuous promotion of frequency conversion technology, frequency converters are increasingly being used in wire drawing machine equipment. [b]2 Frequency Conversion Control Principle and Implementation 2.1 Main Electrical Components of Wire Drawing Machines[/b] Generally, wire drawing machines mainly consist of unwinding motors, take-up motors, and wire laying motors as the drive part. As the take-up coil diameter continues to increase, the speed of the take-up motor should decrease accordingly to ensure a constant wire speed. In control, tension feedback devices are often used to adjust the speed of the take-up motor. With the continuous enhancement of inverter functions and the stabilization of performance, inverters are also being used in wire drawing machines. In these machines, inverters control the take-up and pay-off motors, while the wire-laying motor, due to its smaller power, is directly controlled by the mains voltage. A schematic diagram of inverter control is shown in Figure 1. 2.2 Basic Control Principle The pay-off and take-up motors are controlled by two inverters respectively (as shown in Figure 1). The pay-off inverter adjusts its speed via an external potentiometer. The take-up inverter receives the analog AM output signal from the pay-off inverter, the tension balance feedback signal, and after passing through a signal conversion board and a PID controller, controls the take-up inverter (as shown in Figure 2). As the diameter of the take-up drum changes, the feedback signal from the tension balance bar also changes. The tension bar feedback signal (composed of a precision rheostat) is converted to 0-10V via a signal conversion circuit board. This signal, along with the analog AM and AM output signals from the pay-off inverter, constitutes the two input signals for the PID controller. After PID adjustment, the take-up inverter is controlled to maintain a certain linear speed for the wire. [b][align=center]For details, please click: Application of Frequency Converters in Wire Drawing Machines[/align][/b]