Abstract: Based on the analysis of the roving winding system, a novel roving transmission system with variable frequency speed regulation of 5 motors controlled by an industrial control computer and PLC is proposed using mechatronics technology. The design of the control and software parts is also discussed. Keywords: roving frame, frequency converter, computer control, mechatronics, Visual C++ The roving process is between drawing and spinning. It is responsible for part of the drafting from drawing to spinning and gives the yarn a certain twist to adapt to the drafting capacity and drafting strength of the spinning frame. Therefore, its quality directly affects the quality of the yarn. Traditional roving frames use a single motor drive, making the entire mechanical transmission system very complex and cumbersome. Due to the large nonlinear error in the mechanical transmission chain, the control of roving tension is very unstable, the speed regulation accuracy is low, and the dynamic response is poor. In addition, process calculation and variety change are very troublesome, the range of variety changes is small, and the production value deviates from the theoretical value, which limits the further improvement of roving frame output and quality. Therefore, with the rapid development of electronics, microelectronics, and information technology, and the increasing sophistication of AC motor variable frequency speed control technology, applying computer-controlled variable frequency speed control technology to the roving frame transmission system has become a feasible method. This paper will adopt a computer-controlled 5-motor variable frequency drive roving frame transmission system and conduct necessary analysis and discussion. 1 Design Scheme The drafting speed of the roving frame is determined by the front roller, the spindle speed and the front roller determine the twist, the bobbin speed and the roving speed determine the winding and forming, and the rear roller determines the total draft ratio. Therefore, using 5 motors to control the front roller speed, spindle speed, bobbin speed, roving lifting speed, and rear roller speed respectively, and using electromagnets to control the roving reversal, can save a large number of gear changes, and can achieve precise process design through precise motor speed control. See Figure 1 for details. [b][align=center]For more details, please click: Application of Variable Frequency Speed ​​Control in Roving Frames[/align][/b]