The energy-saving self-excitation three-phase asynchronous motor comprises a
stator, a rotor, an end cover and a supporting frame, the
stator comprises a
stator iron core, a stator winding and a
machine base, the rotor comprises a rotor iron core, a rotor winding and an output shaft, the end cover is installed at the front end of the
machine base, and the supporting frame and a fan cover are installed at the rear portion of the
machine base. The supporting frame and the fan cover are both of a front-back penetrating hollow structure, the end cover and the supporting frame are jointly and rotationally connected with a horizontal output shaft, a ventilation channel is arranged between the end cover and the machine base, and the ventilation channel is communicated with an inner cavity of the machine base. The rear supporting piece is fastened with the fan cover or the limiting frame, the rotating direction of the
turbofan can be changed on the basis that the rotating direction of the output shaft is not changed, and therefore the air circulation direction from front to back and the air circulation direction from back to front are formed, the ventilation and heat dissipation effects are guaranteed, and the service life of the
turbofan is prolonged. And the fan cover and the ventilation channel can be washed and blown repeatedly, so that the trouble of cleaning is reduced.