What Happens When Motor Brushes Wear Out. Light load low humidity brush grades with low filming rates or film reducing contamination can cause lighter color. Carbon is used as it is a reasonable conductor and is soft enough to wear down instead of wearing down the comutator - the ring the brushes press against.
The segments are then shorted together resulting in arcing between the brushes. It can damage the motor by blocking the cooling fan which causes its temperature to raise. These brushes are small pieces of carbon that are important contact points between the tools power source and the actual electric motor in the tool itself.
Brushless motors commutate electronically therefore it is more complex which means that they require more equipment to run such as a computer controller software controller wiringcabling and encoders in most cases.
A flashover can be catastrophic to the motor and motor brushes. Shielding devices are available which are used for this purpose. Over time the brushes wear but as long as they are making a connection the length shouldnt matter. Off-and-On Use During Operation.
