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.
九域图原理是电压无功控制的成熟理论，但在处理三绕组变压器时有一定的难度。
The nine-zone graph theory is widely recognized in reactive power optimization but hard to deal with three-coil transformers.
通过四象限变流器交流侧矢量图的分析，阐述牵引绕组间的互感对四象限变流器控制性能的影响。
According to the analysis of ac vector diagram, the effect of the mutual inductance among the traction windings on the control (performance) of the 4qc is discussed.
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