3-gear DC frequency conversion fan with complete functions. Function introduction: the mainstream design scheme of DC brushless variable frequency motor is adopted, which has the functions of low noise, low energy consumption, energy saving and safety, stepless speed change, automatic gear switching, locked rotor automatic speed regulation, and touch key control. In combination with all the functions of integrated stoves in the market (automatic disinfection, drying, cleaning, heat preservation, lifting, linkage of stoves and steamers, timed flameout, independent flameout of left and right stoves, door lock, etc.), realize function integration, improve product stability and save cost.