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1·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.

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。

2·Based on the mathematic model of separately excited DC motor, the control structure of the single - feedback-closed-loop controlled DC velocity modulation system was obtained.

在他励直流电机的数学模型的基础上，得到了单反馈闭环控制的直流调速系统的结构。