励磁绕组和电枢电路有各种接法，因而有不同的性能，这是直流电动机的显著优点。
The field circuit and the armature circuit can be interconnected in various ways to provide a wide variety of performance characteristics - an outstanding advantage of DC machines.
若将他励直流电动机输出功率的机理等效为一个与电动机电枢绕组并联的可变电阻，可以得到他励直流电动机可变电阻型等效电路图。
The output power mechanism of a separately excited DC motor can be equivalent to a variable resistance, which is parallel with the armature winding of the motor.
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。
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.
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