本文对778光电经纬仪直流力矩电动机与直流测速发电机的调试作了理论分析和实际调试方法的叙述，给出了电机主要参数与结果。
The article analyses and describes the adjustment of DC torque motor and DC speed-measuring motor for 778 photo-theodolite. Main parameters of the motor and results are also given.
本绕线式电动机转子电路脉冲调速系统模拟试验，省去了测速发电机，而利用转子电势组成速度负反馈系统。
The model test tried on this system did not use the tachometer generator but used rotor electromotive force instead to form the speed negative feed-back system.
介绍了直流电动机无传感器测速的实验方法，并选取了三台不同结构的直流电动机进行实验。
The experiment method on sensorless speed estimation in DC motor and three special cases of DC motor with different number of poles and different number of commutator bars were presented.
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