The efficiency of the motor is the ratio of the active output power to the active input power of the motor. Efficiency is expressed as a percentage.

　　(1) there are two methods of efficiency measurement:

　　A. direct measurement; measure the output and input power of the tested motor to determine efficiency.

　　6. indirect measurement; volume and analysis of the loss of the motor to determine efficiency.

　　If there is no other provision, the guaranteed value of efficiency should be understood as the efficiency measured by indirect therapy.

　　(2) the conversion of temperature when measuring efficiency. When measuring efficiency by direct method, the temperature of each part of the motor should reach the actual stable temperature, and the cooling air temperature is converted to 25.