the brush is a peice of carbon that is attached to the startor by a brush holder.
Carbon
A brush is a piece of carbon attached by the brush holder to the startor. (source-page 36 of the study unit for appliance repair)
The most common use of brushes and commutators these days are in universal motors. This type of motor is used in hand tools like drills, saws, and home motor driven appliances
Carbon is much stronger and because the motor commuter is spinning copper brushes will wear off quickly.
universal motor r mostly used for domestic purpose applicatios like the vaccum cleaner,foodprocessors and mixeshair driers,coffee grinders,electric shavers etc....another applications for blowers.
Motor brushes ride one the commutator.
A universal motor is used to operate a food mixer.
construction of universal motor
The normal number of brushes is 2.
the reason for brushes is to makethe motor revolve. The more brushes probably make a more powerful starter motor
synthetic brushes are make-up brushes that are made from man made fibres for bristles so they are also cruelty free, unlike most make brushes which made from animal hair and made by plucking the animals hair out and putting them into brushes.