1 carbon brush into the brush holder to guarantee that up and down to move freely, brush and brush to grip the inner wall of the gap between 0.1-0.3 mm in order to avoid the gap is too large to produce carbon brush and brush holder swing. The edge of the brush Woxia the distance from the commutator surface should be kept at about 2 mm. Such as the distance is too small, brush grip likely to be injured commutator, the distance is too large, the carbon brush is easy to fibrillation caused by breakage.
2 in the same motor, in principle, should be used with a model of the carbon brush, but for the individual to change to a particularly difficult and medium-sized motor, can be twin carbon brushes, slide it into the side of good lubricating properties, slid off the edge using curbed sparks strong carbon brushes, so as to improve the operation of the carbon brush.
3Applied to the carbon brushes of the same motor unit pressure should strive evenly to avoid uneven current distribution, resulting in the individual carbon brushes overheat and spark. The unit pressure of the carbon brushes should be "carbon brush technical performance table to select a high speed motor or motor vibration conditions, should increase the unit pressure, one guaranteed to work. Analogy: the traction machine motor carbon brush unit pressure for 0.4-0.6kgf/cm2.
Carbon brush unit is usually too high pressure, carbon brush wear is increased, the unit pressure is too small, contact unstable, prone to mechanical sparks.

1.Carbon brushes wear to a certain degree of replacement of the carbon brush, carbon brush the best time to replace them all, if you mix old and new, the current uneven distribution of the phenomenon may occur.Large unit shutdown to replace the carbon brush is bound to affect production, you can choose non-stop machine, we usually recommend that customers every time you replace 20 percent of the carbon brushes (ie, each motor brush rod 20%), eachinterval of 1-2 weeks, to be run again to gradually replace the remaining carbon brushes, in order to ensure the normal continuous operation of the unit

2.In order to make good contact with the brush and the commutator, the new carbon brushes should be grinding radians, grinding the curvature of the general motor. Placed between the brush and the commutator of a fine glass sandpaper, grinding along the direction of motor rotation in the normal spring pressure, carbon brushes, sandpaper should try to stick tight commutator, until the carbon brush arc consistent, then remove the sandpaper, blowing dust with compressed air, and then a soft cloth to wipe clean. Grinding the carbon brushes should not be used emery paper to prevent the silicon carbide particles embedded in the commutator slot, the motor is running, abrasions, carbon brush and commutator surface. Grinding arc, the motor first 20-30% load operation for several hours, the carbon brush and commutator running, and the establishment of a uniform oxide film. And then gradually increase the current to the rated load.