Carbon Brush is term used to describe a brush made of carbon that is common used to maintain contact between a stationary wire and a moving part for the purpose of maintaining electrical conduction. Typical application include alternators, generators and electric motors.
In order for an electric motor to operate the coils of the rotor need to be connected to make an electrical circuit. Commonly copper bushed are used to maintain this connection, however they provide poor commutation as they are moved from one segment to the next. To improve this situation graphite was used to form brushes, as carbon has a higher resistance and therefore smoother out the shift of current from one commutator segment to the next.
The first stage of the manufacturing process involves creating the correct carbon composition for the specific application, then compacting it to form the brush – at this stage it is referred to as a “green brush”. Following this the “green brush” is heat treated to make the brush more hard wearing and suitable for the application. Finally a mixture of oils and resins are used to increase the life span and durability of the carbon brush
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