介绍起动机的额定功率参数，阐述如何选择起动机额定功率时的转速和转矩，以及功率参数和功率曲线的测试。

The rated power parameters of starter are briefly introduced in this paper. It also expounds how to select the rotate speed and torque at rated power and how to test the power parameters and curve.

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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.

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