On Study Of Synchronization Control Method For Multi-motor Based On Fuzzy Control

With the continuous progress in science and technology and the rapid development in industrial technology, the motors have become essential element of industrial production. Therefore, the demand on the motor control system performance will increasingly become higher and higher. At present, in more and more industrial production processes, the traditional single-motor-driven model has been unable to meet the production requirements, especially in automotive welding, rail transportation, printing and dyeing, textile in which high-precision and high-speed control system is required. In such processes, multiple motors are needed to work together, and there is some constrained relationship in speed and location between multiple motors. Therefore, it is required to take some control strategies to achieve synchronization control between multiple motors. Thus, the synchronously driven control system for multi-motor attracted more and more scholars’ research interest. At the same time,permanent magnet synchronous motor with its own little harmonic current, high torque current ratio, high energy density, and its simple, efficient and stable control system, has been more and more widely used, especially in high-precision speed control system and servo system. Thus, the study on the synchronous control strategy for permanent magnet synchronous motor drive system is of great significance.On the basis of the synchronization control structure in a cross-coupled multi-motor mode, the intelligent control algorithm based on fuzzy PID is used, which effectively improves the syn c h ron iza tio n pe rfo rma nc e an d the ca pa c ity of an ti-d istu rban ce o f the syste m. The main research contents and innovations include the following aspects:1. In this paper, firstly, with permanent magnet synchronous motor as the control object, the mathematical model is established, direct torque control and three common vector control methods are analyzed and compared, and then the characteristics of their own is summed up. Then the vector control method of excitation current equal zero is used to model and simulate a single permanent magnet synchronous motor in the case of disturbance in order to analyze the steady-state performance and dynamic performance.2.On the above-mentioned basis, an in-depth study is made on three kinds of multi-motor synchronous control strategies such as master-slave control, parallel control, and cross-coupled control in the electric synchronous mode. Two motors are taken for example to make an analysis of the simulation performance of the synchronization performance and anti-jamming capability under the three kinds of control strategies. By comparison, it is found that the cross-coupled control strategy has a better synchronization performance.3. In order to further improve the synchronization performance of the system, on the basis of cross-coupled multi-motor synchronous control strategy, fuzzy PID is proposed to conduct deviation compensation, through modeling and simulation results show both synchronization performance and anti-disturbance performance are improved.