Digital wire-feeding system based on fuzzy adaptive PI control

The relationship between armature induced voltage and speed of wire-feeding motor in buck chopper PWM speed-control system is analyzed. A pulse-width modulation (PWM) speed-control system based on digital control is used to adjust the speed of wire-feeding motor, which can eliminate the effect of load current on the speed of wire-feeding by sampling armature voltage synchronously at the moment of zero current. The fuzzy adaptive PI regulation method is used for adjusting the PWM duty-cycle to change the armature induced voltage and the motor speed. The test results show that fuzzy adaptive PI regulation can improve the startup performance of wire-feeding motor and get better regulation performance and smaller overshoot rather than traditional PI regulation.