High-efficiency permanent-magnet direct-current micromotor

The utility model provides a high-efficiency permanent-magnet DC micromotor, which relates to the technical field of permanent-magnet DC micromotors and comprises a motor main body and a protective ring, a motor shaft is mounted at the output end of the motor main body, a limiting block is fixedly mounted on the outer surface of the protective ring, and a plug-in ring is fixedly mounted on the outer surface of one side, close to the motor shaft, of the motor main body. A limiting groove is formed in the outer surface of the inserting ring, an annular cutting groove is formed in the outer surface of the side, close to the inserting ring, of the motor body, and a calibration assembly is arranged in the protection ring. According to the utility model, through the arrangement of the protection ring, the limiting block, the plugging ring, the limiting groove and the girdling groove, the connection part of the motor shaft and the output end of the motor main body can be protected, and the situation that the motor m