Sliding-ring permanent-magnet DC motor

The utility model relates to a DC motor, particularly a sliding-ring permanent-magnet DC motor, which comprises a stator and a rotor, wherein, the stator comprises a main shaft, a stator iron and an armature winding, and the rotor is positioned on the periphery of the stator; the rotor comprises a casing, a permanent magnetism magnetic steel and an end cover, wherein, the end cover is matched with the main shaft through a bearing; one side of the stator is provided with a pair of conduction carbon brushes and a commutator in axial direction, the inner side of the end cover of the casing is provided with an electricity conducting sliding ring and a pair of reversing carbon brushes in a corresponding way, the reversing carbon brushes and the commutator are contacted in axial direction, and the electricity conducting sliding ring and the conduction carbon brushes are contacted in axial direction. The utility model increases the power density of a motor to cause the mechanical characteristic of the motor to be hardened, meanwhile, the utility model has the advantages that structure is even more compact, volume is reduced, weight is lightened, cost is reduced, operational reliability is enhanced.