The control to welding procedure is realized by a control circuit, and wire feed rate is regulated and controlled by speed governing circuit with the armature voltage negative feedback.
由控制电路实现焊接程序的控制，带电枢电压负反馈的调速电路控制和调节送丝速度。
2
Then the model is applied to simulate the direct start-up process, the reduced voltage starting process and the starting process with series resistance in the armaturecircuit.
The field circuit and the armaturecircuit can be interconnected in various ways to provide a wide variety of performance characteristics - an outstanding advantage of DC machines.