SOLUTION

The commutator is one of a very important parts of the DC machine which rotates with the armature. The function of the commutator is to convert alternating currents induced in the armature conductors into direct currents in the external circuit in case of generator operation. In the case of a dc motor, the function of the commutator is to produce a unidirectional torque. The commutator also helps to keep the magnetic flux stationary in space.

Generally, the alternating voltage is produced in the coil, which is rotating in a magnetic field, but the direct current is required in the external circuit. For this purpose, the commutator is needed. Each commutator segment is connected to the ends of the armature coils. The commutator receives the current from the brushes, which are also placed on the rotating armature