Calculation of 3D Fluid Flow Field and Thermal Field of Air-cooled Medium Motor

For a medium air-cooled asynchronous motor, the physical model of cooling air inside the motor was established to research the air flow distribution and characteristics of the internal flow of the medium motor. By the finite volume method according to the computational fluid mechanics(CFD) principle, the three-dimensional turbulent flow field in computational domain was simulated numerically using boundary conditions of the pressure inlet and outlet obtained from engineering calculations. From the result, the thermal field of stator and rotor was calculation. The results show that the wind speed of cooling air duct which near the both ends was higher than the middle. It causes the temperature of the motor which near the both ends was lower than the middle part. The maximum temperature rise of the motor appear in the middle of the upper windings, and the specific value was 74K.