leave the brushes of the motor at the position where the induced voltage is zero
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No, three phase motors do not actually have neutral line unless you are referring to the motor control centre where a neutral line is required when your control coils and other components are single phase operated
the reason for brushes is to makethe motor revolve. The more brushes probably make a more powerful starter motor
the brush is a peice of carbon that is attached to the startor by a brush holder.
The rotor in a DC motor rotates because the magnetic field in either the rotor or the stator is constantly changing. If it is a brush type DC motor, then the rotor field changes as the rotor moves to a new position on the commutator. If it is a brush-less type DC motor, then there is some circuitry associated with the stator that changes the stator field.
It stops working.