随着发电机额定功率的增大， 额定电流也越来越大。
With the increasing of individual generator capacity, the rated current of generator is also increasing.
由举升流体所需功率和螺杆泵转速预测电动机轴的负载功率，确定地面电机额定功率。
And the horsepower of surface motor is ascertained through anticipating the operating power of motor shaft according to the power of lifting liquid and rotational speed of PCP.
通过对放纸辊电机运行特点的分析，说明在选择电机额定功率时，关键是计算电机的最大负载电流。
Based on the analysis of operation characteristics of the unwind motor, we proved that the calculation of the motor's maximum current is the key for selecting the motor rated power.
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