Research On Synchronous Control Of Dual Linear Motors Driving In Power Spinning Machine

Since the reform and opening up, with the development of the national economy, our country’s manufacturing capabilities continue to improve and now have become a global manufacturing power. Among them the application of spinning machine, from the early aviation, spaceflight, weapons and other military industry to civilian goods manufacturing industry, is becoming more and more widely. Because of the large feed force, power spinning machine can be more efficient to spin thick wall parts, so it has been used more and more widely. But the ‘rotary motor and ball screw’ traditional transmission way of the CNC power spinning machine is complicated structure, inefficient, gaps between transmission parts, deformation and friction factors can cause corresponding errors, which are difficult to meet the requirement of high precision. This article selects dual linear motors servo system to replace intermediate mechanical drive mechanism of a spindle box.etc; it can effectively reduce the reverse gap and friction existing in the traditional transmission way, and can make up for lack of transmission mechanism rigidity, but the control of the linear motor is more difficulty. This article will conduct a study on dual linear motors driven synchronous control, aimed at improving dual linear motors synchronous feed performance of longitudinal feed servo system of the spinning machine, the main research content and results are listed below:(1) Derive the mathematical model of dual linear motors synchronous control system. First of all, d and q axis mathematical model of permanent magnet synchronous linear motor is based on the analysis of basic structure and working principle of motor, and then the mathematical model of synchronous control system, is based on force analysis of longitudinal feed servo system. Finally, this article details synchronous control structure, the main disturbance factors and its solution of affecting synchronous control, which lay the foundation for subsequent choosing control strategy.(2) Improve response speed and tracking accuracy of position loop of the single axis system. In view of the characteristic of obvious nonlinear, parameter time-varying, strong coupling and additional disturbance etc, precise mathematical model of linear motor is not easy to build. In this article, Model-free Adaptive Control is applied to the position control of linear servo system. In order to further improve robustness of the system, pseudo-derivative feedback control of strong anti-interference is applied to the speed control of the single axis subsystem. Finally, the feasibility of the control strategy has been verified by MATLAB/Simulink simulation software.(3) Realize biaxial synchronous feed, improve synchronous control precision. In view of mechanical strong coupling between biaxial of longitudinal feed servo system of the spinning machine, this article designs a variable universe fuzzy adaptive PID synchronous controller, which is used to compensate position error of two permanent magnet synchronous linear motors, mainly introduces the theory of variable domain and the design process of the synchronous controller. Finally, simulation model of synchronous control system is built in the MATLAB/Simulink platform and conducted dynamic simulation, the simulation results show that the scheme has improved the synchronization control precision.