Carbon brushes
are the small block of carbon that transfers the high voltage current from the
secondary coil circuit to the distributor. It is a
sliding contact used to transmit electrical current from a static to a rotating
part in a generator or a motor. The DC machine is regarded to ensure a
spark-free commutation and helps to conduct the electricity between the moving parts
of the motors.The
DC motor serves an important role in ensuring the efficient performance and
proper functioning of the motor. It includes alternators, electric generators,
and electric motors.
The
Manufacturing process of carbon brushes
·
Mixing components –
The Graphite or the carbon powder are
most commonly used to manufacture the brushes, and the composition of the brush
depends on the application. For better conduction, copper is used, and to
maximize green strength and electrical conductivity. Solid lubricants and metal
powder are included.
·
Compacting the mixture
–
In the next process, the copper wire is
inserted automatically through a hole in the upper punch and fixed into the
press’s brush. The powder blocks the pressed brush pressed around. The tamping
operation is done using an electrolytic copper powder that is coated with
silver for some of the high performed applications.
·
Firing of green brushes
–
The third step is heat treatment. Under
an artificial atmosphere, the heat treatment is given to the green brush. This
process is also called as sintering or baking used to burn off or carbonize to
form a crystalline structure between carbon and copper.
·
Secondary operations –
This is an additional step in the making
of Evolution
Brushes to make the brush more durable by impregnation on the running
surface with oils, grease, and resins.The
function of the electric motor and generators is that the rotor must be
connected to complete an electric circuit.
