Question

what is the use of commutator rings in motor

Answer 1

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

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Answer 2

To keep a 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