基于PLC的MIG焊送丝机控制系统

Research on control system for MIG welding wire feeder based on PLC

目前针对国内MIG焊送丝机普遍采用电压负反馈的常规PID控制,控制参数无法在线调节,送丝平稳度不高、送丝系统动特性差等缺点,设计了一种基于模糊PID控制器的闭环送丝机速度调节系统。阐述送丝机速度调节原理,建立模糊PID控制器隶属函数和模糊规则表,给出模糊PID控制的PLC程序实现方法。

Conventional PID with negative voltage feedback is widely used for controlling MIG welding wire feeder in our country. However, PID parameters can not be adjusted online, smoothness of wire feed is not high, anti dynamic characteristics of wire feed system is poor. A speed control system for closed loop wire feeder is designed based on a fuzzy PID controller. The p,＇inciple of speed adjustment of the wire feeder is described, the membership function and rule list of ft, zzy PID controller are established. And the implementation method of PLC program for fuzzy PID control is introduced.