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Edit: Standard Electrical Co., Ltd. Shenzhen wind turbine experts more price and specifications, please visit our Ali official website: http: //fbemf2014.1688.com/ This method can also be called the alignment of the machine method, mainly to test the fan With motor motor instead of the calibration when the fan aerodynamic performance test, with direct measurement of motor economy instrument input and output characteristics of the motor and efficiency characteristics. This motor characteristic curve input fan aerodynamic performance test system, select the appropriate performance parameters from the motor performance curves according to the fan load operating point, so you can very easily measure the fan impeller shaft power and fan efficiency. Because this method is used instead of the actual calibration of the motor motor running, so there is a use premise: the motor output power to the fan manufacturer in accordance with acceptable efficiency and user (full efficiency of the motor). And in the course should pay attention to the motor running enough time to keep it operated at normal operating temperature. Also worth noting is that this method was found the same type of motor efficiency curve differences still exist in the actual operation, in the accuracy requirements are relatively high, the value of the difference between the two can not be ignored. 4 AMCA method This method is also called phase current law, ventilator testers usually call it electrical measurement method. This method is the impeller shaft power and fan aerodynamic performance test test combined resistance test with the fan impeller and piping components as motor load, the fan aerodynamic performance test, the simultaneous measurement of electrical parameters of three-phase motors and speed as well as After winding temperature single operating point, determining the stray load losses and no-load test when the fan is not connected to the motor, measured iron loss and wind wear and motor loss in the stator and rotor losses prescribed temperature. The various losses input test system software automatically calculates the fan at each operating point test impeller shaft power to accurately calculate the aid of fan efficiency. Advantages of this method is entirely under actual operating conditions the fan point measured the impeller shaft power, can be very accurately measured fan efficiency curves than the alignment of the machine method significantly improved accuracy. But also a better solution can not be used "torque meter Act" situation, and the application is more convenient, you can assess the efficiency of statutory testing organizations use. 5. Conclusion With the continuous progress of the national energy conservation, energy saving trend of gradual development, while countries have included fan energy efficiency labeling license directory, how accurate determination fan efficiency, energy-saving products become a large assessment fan manufacturer and important issue of third-party testing organization. Simple analysis above four on the fan impeller shaft power measurement method principle and the advantages and disadvantages of each approach has its applicable conditions and premise, and the need to have a complete fan aerodynamic performance-based test system is based. Mainly to provide information and reference for the front-line of a ventilator test operators, lab can choose the appropriate test methods based on actual testing requirements.