Miniature low-voltage servo motor with diameter of 40mm

The utility model belongs to the technical field of servo motors, and particularly relates to a miniature low-voltage servo motor with the diameter of 40mm, which comprises a shell, a sealing plate is arranged at one end of the shell, a rotor opening is formed in the surface of the sealing plate, a flange groove is formed in one end of the rotor opening, a flange plate is arranged in the flange groove, and a rotor is arranged in the flange plate. A rotor opening is formed in the shell, a bearing is arranged on one side of the rotor opening, a driving device is arranged in the shell, a rotor is arranged at one end of the driving device, one end of the rotor extends out of the rotor opening, an encoder box is arranged at the other end of the driving device, and a cooling mechanism is arranged at the bottom of the shell. After the servo motor is used for a period of time, the cooling fan can be driven to rotate through the cooling fan, so that heat in the shell is discharged out of the shell through the heat dis