Study on the evaluation of uncertainty for the efficiency of 0.75[kW] class three phase induction motor

In the last few years, the regulations for efficiency grade of the three phase induction motor are internationally - being discussed and upgraded for the protection of environment and energy saving. So the efficiency improvement and the reliable test result are essential to determine the premium grade three phase induction motor. While a study on developing the efficiency motor is active, there is little research about the guarantee for efficiency. So in this paper, the dispersion characteristic of the efficiency is studied using uncertainty theory for the three phase induction motor to improve the reliability of efficiency. The values such as input voltage, current, speed, torque were obtained by loss separation method to evaluate the uncertainty. From the result, it was known that the important loss factor could affect the uncertainty is the stray loss. Copyright © The Korean Institute of Electrical Engineers.