Abstract:

This paper introduces design philosophy and practical circuit of wire feeding with uniform speed for a soldering machine.With the technology of Pulse Width Modulation and making automatic feedback regulation,the power supply voltage of DC feeding motor will change with motor torque in order to feed wire stably.Experiments have shown that this circuit has high ability of feedback regulation and the soldering machine can feed wire with uniform speed.

Key words: wire feeding with uniform speed;pulse width modulation;feedback regulation