In order to improve the accuracy and repeatability of the test motor efficiency for small and medium-sized asynchronous motor by measuring each loss component so as to strike a loss of efficiency analysis. But the specific methods used in the international are not uniform. Motor efficiency test method standards used in different countries and regions, their main difference lies in the treatment of stray load loss. IEEE-112b provisions of stray load losses determined by the input and output method, IEEE-112e provisions of stray load loss inversion method for the determination of the provisions of IEC34-2 stray load losses of 0.5% of the input power, Japan JEC provides load stray loss is O, and in fact, stray load losses of the motor varies with the motor design, manufacturing process and the type of power, speed ships in the range of 1.5% to 3.5% of the input power.

    The domestic Y and Y2 two low-voltage asynchronous motor series in the production and use of. Y series is the product of the early 1980s, the national unified design, the power range of 0.55 kW ~ 250kW base center height of 80 mm ~ 315mm, a total of 12 base, annual production of about 20 million kW. Y2 series is a new generation of products developed in the mid-1990s by the Shanghai Electrical Apparatus Research Institute and Beijing Motor Plant, Shanghai Electric (Group) Corporation, Dalian Motor Factory sponsoring organizations. Its power from 0.12 kW ~ 315KW, frame size from 63 mm ... 355mm of 15 base. Also designed in order to adapt to the different load ratio and the running time Occasion design, while in the Y2, Y2-E series, the former for ships drive occasions, the latter can be used for higher load rates and longer running time Occasion.