Research on the influence of temperature on the performance of induction motor

Abstract

Background: : Induction motor occupies a large proportion in various industries, and its number is increasing. Due to the environmental temperature or sealed working environment, heat generation is generally serious. The heat exchange with the outside environment does not take place smoothly and the motor temperature increases. The performance of the induction motors also significantly influenced by the temperature. Therefore, it is necessary to study the influence of temperature on the performance of induction motor. Objective: The influence of temperature on induction motor is analysed. The variation of performance parameters at different temperatures is obtained. Methods: Taking an 11 kW, 1500r/min induction motor as an example, a two-dimensional transient electromagnetic field model was established, and the correctness of the model was verified by experiments. The motor starting performance, various losses and efficiency under different temperatures were calculated. Results : As the stator and rotor resistance increases, the starting current decreases by 11.99% when the internal temperature rises from 25℃ to 150℃. When the internal temperature rises from 25℃ to 150℃, the stator copper loss increases by 32.83%, and the rotor copper loss increases by 28.79%. However, the core loss of the motor increases by 3W. and the motor efficiency decreases by 2.12%. Conclusion: When the temperature is different, the starting torque of the motor is almost unchanged, and the starting current decreases with the increase of temperature. The stator copper loss and rotor copper loss of the motor increase with the increase of temperature, while the core loss is almost unchanged. In addition, the efficiency of the motor gradually decreases with the increase of temperature.