The model test tried on this system did not use the tachometer generator but used rotor electromotiveforce instead to form the speed negative feed-back system.
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。
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This paper analyzes the forming process of unloading voltage and the relations among unloading voltage, phase electromotiveforce, exciting current and rotational speed in art alternator.