Abstract : In the ultra-high molecular weight polyethylene fiber redrawing production line, an open-loop control system is formed by a current vector high-precision frequency converter and a permanent magnet synchronous motor, and networked with a touch screen to form a fully automatic speed control system. Keywords: high-precision frequency converter; permanent magnet synchronous motor; touch screen [b]0 Introduction[/b] The ultra-high molecular weight polyethylene fiber redrawing production line is a process in which the fibers produced by the PE fiber spinning combined production line, after preliminary drawing and shaping, are subjected to synchronous hot drawing again by a three-stage four-roller drawing machine (as shown in Figure 1) to achieve a fineness of 1600D standard specification and possess excellent properties such as high strength (strength reaches 30CN/dtex) and high modulus (modulus reaches 1000 or more). The strength, modulus, fineness and other indicators of the entire fiber bundle should also remain uniform. This places very strict requirements on the electrical drive. The requirements of the ultra-high molecular weight polyethylene fiber redrawing production line for electrical drive can be summarized as "three highs" and "one protection". "Three Highs": High precision (stable speed, accuracy up to 0.1%~0.01%); High synchronization (the drawing speeds of the four drawing motors in the three-stage hot drawing should maintain longitudinal proportional synchronization); High reliability (guaranteeing at least one year of continuous safe operation, with minimal or no maintenance). "One Protection": Anti-backlash (the front-stage motor can operate for extended periods in a backlash state compared to the rear-stage motor). [b]1 Establishment of the Electrical Drive System for the Ultra-High Molecular Weight Polyethylene Fiber Re-drawing Production Line 1.1 Selection of Control Scheme[/b] [b][align=center]For details, please click: Speed ​​Control System of Ultra-High Molecular Weight Polyethylene Fiber Re-drawing Production Line[/align][/b]