Composite brush cover structure of direct-current brush motor capable of automatically cleaning carbon powder

The invention provides a composite brush cover structure of a direct-current brush motor capable of automatically cleaning carbon powder. The composite brush cover structure comprises an outer-layer brush cover and an inner-layer brush cover, the circumferential edge of the inner-layer brush cover is connected with the circumferential edge of the outer-layer brush cover, and a gap is reserved between the outer-layer brush cover and the inner-layer brush cover; the inner-layer brush cover comprises an insulating part and a conductor part covering the insulating part; two ends of the insulating part are convex structures of the inner-layer brush cover; a plurality of square holes are formed in the axial direction of the insulating part covered with the conductor part, and a wire is welded to the conductor part. Wind pressure in the motor end cavity is released by opening the kidney-shaped hole, and the heat dissipation capacity of the motor is improved; and meanwhile, a composite structure is adopted, and the c