What is commutator?

An attachment, connected with the armature of a motor or dynamo, through which electrical connection is made and which ensures the current flows as the direct current is known as a commutator. The function of commutator: 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 commutator is used to reverse the current at that point. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors.

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