Motor

The invention provides a motor. The motor comprises a shell, a rotor, a stator, a winding, a bearing and a heat dissipation device, the heat dissipation device comprises a rotating piece and a heat dissipation piece; one end of the rotating piece is connected to the rotor, the other end of the rotating piece is rotationally connected to the shell, and the rotating piece comprises an inner side face and an outer side face; the heat dissipation piece is arranged on the inner side face and/or the outer side face. Under the condition that the rotor rotates, the rotating piece rotates, the heat dissipation piece located on the outer side face rotates so that a cooling medium can flow along the first cooling air path, the cooling medium in the first cooling air path passes through the rotor and the stator, and the heat dissipation piece located on the inner side face rotates so that the cooling medium can flow along the second cooling air path. The cooling medium in the second cooling air path is used for cooling t