一种基于DSP数字化控制送丝系统

摘要

设计了一种基于DSP的数字化控制PWM调速送丝系统,以稳定送丝速度为控制目标,采用电枢无电流段电枢电势同步采样方法,排除了负载电流对送丝速度的影响;采用数字PI调节,调节PWM占空比,控制电枢电势恒定,达到稳定送丝速度的目的,改善送丝性能.实验表明,电网电压波动以及送丝软管从平直状态到软管中部弯绕φ400 mm一圈情况下,送丝速度变化率满足标准要求.%In this artiele,a Pulse-Width Modulation speed-controlled wire-feeding system,digitally controlled by DSP,is designed. Inside the system, the control target is the speed of wire-feeding, and the control method is synchronous sampling of armature voltage on the moment of no current,which can eliminate the effect from load current on the speed of wire-feeding. The digital PI regulation method is used for adjusting the Pulse-Width Modulation duty cycle to keep the armature voltage constant and improve the property of feeding. The experiments show that the rate varieties of wire-feeding on the condition of variable power network voltage and change of wire-feeding tube from straight state to a cycle of φ 400 mm at the middle all met the standard requirements.