| Digital welding machine multi-axial control mainly includes the torch yaw control and motor speed control of wire, this paper mainly discusses the process of welding wire feeding speed. The stability and reliability of the wire-speeding directly affect of the welding current and transition metal droplet, even weld forming and welding quality. High quality welding depends heavily on performance wire system. Therefore, how to ensure the smooth and steady wire feeding machine is an important part of the welding equipment study.Introduced digital control into welding field, we can control speed by virtue of more flexible control algorithm in the wire system. Digital control has also significant advantages than analog control mode with control accuracy,consistency and stability. At present, there are two main ways to improve wire agency:improvement on performance of hardware and software of control. The change on the given value of wire speed will affect the dynamic characteristics of the controlled objects, the traditional PID control system has been failed to meet the requirement of accuracy and stability, using better control algorithm to improve the performance of the system has wide application prospects.Designed the wire control system based on DSP microprocessor TMS320F2812, which has been realized DC motor double closed loop control. Closed-loop control is composed of speed detection,current detection,PWM control module driver and fuzzy PID controller. Choose Accelnet micro control module to realize DC motor drive control; Design encoder measuring circuit and current detection circuit to complete the detection of the speed and the current; Using the fuzzy PID control strategy for wire speed control system.The paper already carries out speed and current loop simulation experiment by means of MATLAB simulation platform. Speed regulator is used with fuzzy PID control strategy, current regulator is used with PI control strategy. Simulation results show that the proposed scheme can be effectively used in wire feeding system, and the fuzzy PID control algorithm in DC motor speed control is superior to the traditional PID control. |
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