The utility model discloses a send out adjusting device of removal certainly of motor carbon brush subassembly, including collecting ring, carbon brush, conducting ring, the collecting ring passes through the carbon brush to be connected with the conducting ring electricity, and the carbon brush supports with the conducting ring and covers in the support, its characterized in that covers in the support and sets up the guide rail, and brush holder slidable formula sets up at the guide rail, the one end and the servo motor of brush holder are connected, and the other end and the carbon brush of brush holder are connected, servo motor drives brush holder along guide rail reciprocating motion when rotating, the brush holder drives the carbon brush and keeps away from the collecting ring and break away from the contact, perhaps is close to the collecting ring and connects. The utility model discloses PLC controlling means control down, through the electric current of the brush measured or the temperature of carbon brush, the carbon brush quantity of automatic adjustment and collecting ring contact move about, the carbon brush subassembly realize its with the collecting ring contact or break away from, the realization is adjusted the temperature of brush, can prevent effectively that the carbon brush is overheated, gets rid of the potential safety hazard, current density that can also the automatically regulated brush makes safer, the steady operation of unit.