基于DSP的脉冲MIG焊数字控制系统的建模与仿真

Modeing and simulation of digital signal processor-based pulsed metal inert-gas welding digital control system

为实现一脉一滴熔滴过渡,采用了双阶梯外特性和脉冲MIG焊电参数控制策略。构建了基于DSP(digitalsignalprocessor)的脉冲MIG焊数字控制系统模型。建立了控制系统的仿真模型。借助MATLAB对控制系统进行了仿真研究,得到了数字控制器的最佳参数范围。进行了脉冲MIG焊数字控制器的仿真试验。结果表明,所设计的数字控制器可以实现电弧电压、焊接电流的实时准确快速调节,能够实现脉冲MIG焊双阶梯形外特性和熔滴过渡的控制。

The electrical-parameter-control method is brought forward and the double-L power source output characteristic is utilized to realize the goal of one-pulse-and-one-droplet transition of pulsed MIG (metal inert-gas) welding. Digital signal processor-based digital control system model of pulsed MIG welding is set up. The model for simulation is built, and the optimal parameters range is obtained by MATLAB simulation. The simulation experiments on digital controller are carried out. Simulation results indicate that the real-time and accurate adjustment of welding voltage and welding current can be accomplished quickly by the digital controller, but also the control system is able to achieve the control of the double-L power source output characteristic control and droplets transition mode control.