China motor mech, when the motor is in no-load operation, the cooling gas passes through the ventilation duct and air gap through the inlet at a certain speed and passes through the rotating motor. Due to the effect of friction, the outer surface of the rotor will generate a fluid along the rotation direction of the motor. At the same time, the friction torque on the stator will also produce a reverse friction torque on the inner surface of the stator. The two friction torques should be equal in value and opposite in direction. After any one of the friction torque is multiplied by the speed, the wind friction loss caused by the cooling gas passing through the rotating motor can be obtained. Therefore, the steady-state fluid field analysis of the model is carried out without coupling the energy equation. When modeling, it should be noted that neither the outer surface of the rotor nor the inner surface of the stator is absolutely smooth in actual situations, and different roughness degrees have a greater impact on the calculation of the fluid field, in order to simulate the motor more realistically. The distribution of the medium fluid field, this paper adopts
Use the method of setting the absolute surface roughness to simulate this situation. The absolute surface roughness determines the result of the simulation, and multiple considerations are required when setting.
