Research On The Calculation Of Loss And Temperature Rise In The Air Cooling Motor

Air cooling motor has been widely applied because of the advantages of its simplecooling system, convenient operation and maintenance. As the increasing capacity of aircooling motor, the increasing heat load directly affects the service life of the motor and thereliability of the operation. The research on the heating and cooling problem of the aircooling motor has important significance for the safe operation and optimization design ofmotor.Based on the2500kW cooling asynchronous motor, the temperature field distributionof the air cooling motor is studied.In order to accurately obtain the temperature of aircooling motor, first of all, according to the electromagnetic field theory of air coolingmotor, the electromagnetic loss of air cooling motor is calculated and analyzed to obtainthe loss of each part of motor.Secondly, based on fluid mechanics theory, combined withthe structure of the ventilation system of the motor, the twelfth calculation model of motoris established to use FLUNET software to calculate the fluid field of the air coolingmotor.Finally, the fluid field and temperature field of the motor is compellinglycalculated.The influence of separated load loss and overall load loss for the temperaturerise of motor in motor teeth and yoke is compared and analyzed.The results show that themaximum temperature of separated load loss is the4.5K lower than that of overall loadloss in motor teeth and yoke.The temperature distribution of no-load operation and loadoperation of the motor is studied and the highest temperature rise of load operation is23.46%higher than that of no-load operation.The influence of different wind speed at theentrance for the motor temperature rise is calculated. With the increase of wind speed atthe entrance, the reducing rate of motor temperature becomes lower and lower. The higherthe wind velocity at the entrance, the lower the motor temperature rise. The influence ofdifferent stray loss for the motor temperature rise is analyzed. With the increase of thestray loss, the maximum temperature increases according to the approximate linear.As the stray loss increases from0.5%to2.0%, the max imum motor temperature rises by36.15%.