Carbon brush, brush quality is affected by the work, a simple damage of the carbon brush, brush will be in the work time to bring a lot of trouble, how to distinguish the quality of carbon brush, brush.

Carbon brush is a relatively common wearing parts, its quality first to see:

Finish (bright appearance)

Handle (the handle should be smooth and free from impurities)

Electrical conductivity (the smaller the internal resistance, the better)

It is always well that the fire is silent in operation. When the current is below the rated value, the tension pressure is normal, and the slip ring (or commutator) is smooth, the carbon brush contact surface is smooth and lubricated, and the wear is even, so it will not ignite.

Each carbon brush, brush production method, divided into two categories.

One is colored carbon brush, namely metallic graphite carbon brush.

One is a black carbon brush.

Carbon brush, brush the use of outstanding carbon brush symbol first has the following conditions:

1, brush operation, no overheating, small noise, no damage, brush braids do not change color, no ablation.

2. In the process of operation, a uniform, moderate and stable oxide film can be formed quickly on the surface of commutator or collector ring.

3, long service life and no wear commutator or collector ring, do not make the commutator scratches, uneven, ablation, wire drawing, etc.

4, has the outstanding commutation and the collection current function, causes the spark to be restrained in the allowed scope, moreover the energy loss is small.