To pump energy back into the grid, some of the rotational energy is bled off to power a generator on the main shaft.
把电能又送回电网时，就释放一部分转动的动能，开动位于主轴的发电机。
The input power of motor and shaft power of pump are key measurements in field test of pumping stations.
电动机输入功率和水泵轴功率测试是泵站现场测试的重要内容。
When pumping water, the head, shaft power and efficiency of the pump decrease with the reducing in impeller diameter.
输送水时，叶轮切割后，泵的扬程、轴功率、效率都下降。
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