Design method for highly efficient rear incline centrifugal type cooling external fan for high-voltage asynchronous motor

A design method of an efficient back tilting centrifuging cooling external fan of a high voltage asynchronous motor belongs to the research technique of a high voltage high active motor. The method is characterized in that a backing tilting centrifuging fan with higher efficiency is improved; under the conditions of guaranteeing the mechanical strength, noise and temperature elevation, according to the anticipant depressed wear and tear loss of the fan, wind pressure and blast volume needed by the fan are satisfied; and the basic size of the fan, the shape of blades and the amount of the blades are accounted; wherein shaped lines of the blades and the angle of an inlet and an outlet are determined while the technique is considered; and the size is optimized and amended to reduce wind friction loss. The fan has low noise and high efficiency; the blades are added in the beginning end to ensure that the impact loss of the inlet of the blades is reduced; and the fan has good aero performance and is suitable for t