For a fully enclosed self fan cooled squirrel cage three-phase asynchronous motor, the fan cover adopts a clean flow fan cover, which has the characteristics of good ventilation effect and strong anti fiber blockage ability. It is suitable for various textile, printing and dyeing machinery such as cotton, wool, linen, silk and chemical fibers, and can work in environments with high dust, short fibers, high temperature and humidity. It can also be used for driving other mechanical equipment.