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is a device which conducts current between stationary wires and moving
parts, most commonly in a rotating shaft. Typical applications include
electric motors, alternators and electric generators.
distinguished basically three types of carbon brushes: brushes for
automotive applications: Direct Current, voltage 12-48 V, brushes for
household applications: Alternating Current, voltage 110 / 220 V,
brushes for industrial motors: both Alternating Current and Direct
Current, various voltages.
composition of the brush depends on the application. Graphite/carbon
powder is commonly used. Copper is used for better conductance (rare for
AC applications and not on automotive fuel pumps which run on carbon
brush is typically constructed of carbon with an amorphous structure or
graphite which is an allotropic form of carbon.
sizes are designated as Thickness x Width x Length of the carbon.It
performs both an electrical and a mechanical function within a system.
It is a conductor of current in an electrical circuit and it is
subjected to mechanical forces as it makes physical contact with a
surface in motion.
Successful carbon brush operation is dependent on many factors but the
primary factor is proper contact and mechanical stability.
powder is generally used for the manufacture of carbon brushes applied
in low voltage motors.
to increase service life and to minimize susceptibility to electromotor
failure, the carbon brushes must be guided with low friction and wear
and without burring.
requirement for problem-free movement of the carbon brushes is a smooth
and well-designed precisely dimensioned sealing technique.
brush for discharging static electricity of protecting semiconductor
devices from damage by the discharge of static electricity from the
characterize carbon and graphite materials used for carbon brushes, it
is sufficient to state the following material characteristics: Specific
Electrical Resistance, hardness and bending strength and bulk density.
specific electrical resistance (SER) of a carbon brush that can be used
in a starter motor is greater than 1000µcm, the SER of a carbon brush
that can be used in an auxiliary electric motor or an alternator is
greater than 10,000µcm, and the SER of a carbon brush that can be used
in fuel pump motor is greater than 20,000µcm.
carbon brush assembly includes a carbon brush, a carbon brush seat, a
constant force spring and a cover.
constant carbon brush pressure also can maintain proper contact between
the carbon brush and a connecting portion to prevent poor electrical
contact and generation of sparks.
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