本文根据国家标准GB 3853—83规定,详细介绍了电动机损耗分析法测定压缩机轴功率的概念、电机损耗分析和测定以及电机输出功率P_2的计算,指出了该方法应用场合和注意事项。最后,文章还介绍了用直流电力测功机测定压缩机轴功率的方法。此法由于精度高,测功机本身就是一台驱动设备,可以调速,所以在国外的一些压缩机公司的试验室获得广泛应用。 According to the national standard GB 3853-83, the paper introduces the concept of motor loss analysis to measure compressor shaft power in detail, the analysis and determination of motor loss, and the calculation of motor output power P_2. The applications and precautions of this method are pointed out. Finally, the article also introduces the method of measuring compressor shaft power with DC dynamometer. This method because of high precision, dynamometer itself is a driving device, you can speed, so some foreign compressor company’s laboratory access to a wide range of applications.