China motor mech factory， such as the manufacture of fan motors, will increase the temperature rise of the motor due to the reduction of the cooling air volume of the external fan, but can still keep the temperature rise of the motor within the allowable range of the insulation level. At the same time, we have to see that the reduction in motor mechanical loss due to the reduction of the outer fan blade diameter will further reduce the temperature rise of the motor. Especially for high-speed motors like Class 2, 4, when the outer diameter of the fan is reduced by 14%-16%, the ventilation loss will be reduced by 20%-40%. In addition, while changing the diameter of the fan blades, the size of the windshield or fan cover should be changed accordingly, so that the size of their mutual matching meets the regulations. The gap between the fan blade and the fan cover should not be too large, generally between 10-15. If the gap between the fan blade and the fan cover is too large, the leakage loss from the positive high pressure area to the low pressure area should be maintained. At the same time, the angle between the fan blade and the fan cover should be maintained. Part of the dynamic pressure of the wind is converted into static pressure to reduce losses. For example, the fan used for frame 8 can be adjusted and trimmed to use the light-loaded motor of frame 9 so that the light-loaded motor of frame 9 can reduce mechanical loss and increase the temperature rise to improve the motor's performance. Efficiency and power factor.
