Input and output power of instruments was measured, and efficiency of energy conversion instruments and energy loss was calculated, and effective methods were put forward to improve the system.

测量了各装置的输入输出功率，计算了能量转换装置的转换效率和传输过程中的能量损耗，提出了改进系统的有效途径。

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Optimize airflow structure, fan's blade shape design, reduce input power, and improve efficiency.

优化气流结构和风扇的叶片形状设计，降低输入功率，提高效率。

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The results show that available power and power input of water pump continuously decline with motor frequency reducing, and pump efficiency also decrease at the same time.

结果水泵有效功率和输入功率均随着电机频率的下降而不断降低，同时水泵效率也随着频率下降而降低。

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