Four-stage cover-level motor

The utility model relates to the technical field of cover-level motors, in particular to a four-level cover-level motor, which comprises a motor shell and magnetic poles, a rotating shaft is transversely and rotatably connected to the center inside the motor shell, two ends of the rotating shaft extend to the outside of the motor shell, a small stator is mounted inside the motor shell, a through hole is formed in the center of the small stator, and the through hole is communicated with the rotating shaft. A through hole is formed in the motor shell, a rotor is arranged in the through hole, the rotor is fixed on the rotating shaft through riveting, the outer side of the rotor is fixedly sleeved with an aluminum ring, the four small magnetic poles are uniformly distributed on the small stator, and the motor shell is provided with a heat dissipation structure used for rapidly dissipating heat when the motor works. The heat dissipation structure comprises a first heat dissipation piece arranged inside the motor s