Low-speed large-torque permanent magnet motor

The utility model belongs to the field of motors. The utility model discloses a low-speed large-torque permanent magnet motor. The motor is characterized by comprising a motor body, an output shaft ofthe motor body provides kinetic energy for an external water pump. A torque transmission structure which is selected according to actual requirements is arranged between the output shaft and the water pump; the torque transmission structure comprises a speed reducer and a gear pair which is selectively connected with the speed reducer or the water pump in an adjusting mode, the gear pair is movably arranged in the axial direction of the output shaft, and the section, located on the side, away from the motor body, of the gear pair, of the output shaft is further provided with an expansion sleeve. In the actual use process, if the loss of mechanical transmission needs to be reduced, the expansion sleeve is directly adopted for connection; and if the rotating speed needs to be adjusted, themotor body is connected wi