Question

Write the necessity of commutator for operation of a D.C machine?

Answer 1

In case of a DC motor, commutatorreverses the current (available from aDC source) at the exact instant when the armature coil crosses the magnetic neutral axis. This isnecessary to maintain a unidirectional torque. Thus, the commutator convertsdirect current into alternating current.

Answer 2

Commutator and Brushes on DC Motor. To keep the torque on a DC motor from reversing every time the coil moves through the plane perpendicular to the magnetic field, a split-ring device called a commutatoris used to reverse the current at that point.

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