In order to ensure the normal operation of the motor, the good performance of the carbon brush should be:
a A uniform, moderate and stable oxide film can be formed on the surface of the commutator or collector ring quickly.
b The carbon brush has a long service life and does not wear out the commutator or collector ring c The carbon brush has good commutation and current collection performance, so that the spark is suppressed within the allowable range, and the energy loss is small.
d When the carbon brush is running, it is not too hot, the noise is small, the assembly is reliable, and it is not damaged.
