Abstract : Taking a three-axis synchronous transmission system in a strip processing equipment as the research object, this paper proposes a sectional transmission control system scheme with a frequency converter-asynchronous motor as the speed regulation mechanism, the feed shaft as the speed reference shaft, and other shafts as slave shafts, operating in a closed-loop regulation mode of actual dynamic speed difference with the reference shaft. An approximate mathematical model of the frequency converter-asynchronous motor and the variable structure dynamic speed difference closed-loop regulation law are also proposed, and parameter tuning and system implementation techniques are introduced. Keywords : Synchronous transmission control; Variable frequency speed regulation; Asynchronous motor; Modeling 0 Introduction In strip processing equipment such as paper, film, textiles, steel strip, and wire and cable, the general basic process is as follows: the strip material, already processed in the previous process, undergoes unwinding, feeding, intermediate processing stages, pull-out, and winding in this process equipment to become a finished strip material ready for the next process. The prerequisite for the normal operation of such equipment is that the unwinding shaft, feed shaft, intermediate guide shafts, and winding shaft must all be in a state of linear speed synchronous control. This paper takes the three-axis coordination process of feeding, intermediate guidance, and pull-out as the object and explores the design method of multi-machine synchronous transmission control system of asynchronous motor. 1. Composition and Working Principle of Synchronous Drive Control System for Multi-Motor Equipment This paper focuses on the synchronous drive control principle between the feed shaft (M1), intermediate guide shaft (M2), and pull-out shaft (M3). The block diagram of the system is shown in Figure 1. The feed shaft serves as the speed reference, while the intermediate guide shaft and pull-out shaft are slave machines. The inverter commands in each subsystem consist of speed chain (with coefficients K1 and K2) distribution signals UN2 and UN3, and the output signal of the speed difference regulator that dynamically tracks and controls the speed of the reference shaft based on the speed of the local shaft. PG is a photoelectric encoder. In the structure shown in Figure 1, since the speeds of the two slave shafts mainly depend on the speed chain commands UN2 and UN3, the corresponding speed difference regulators only operate in a small adjustment state. [b][align=center]For more details, please click: A Novel Multi-Motor Synchronous Variable Frequency Drive Control System[/align][/b]