A coil ABCD mounted on an axel is placed between the pole N and S of a permanent magnet as shown in fig. Why is commutator necessary for continuous rotation of the coil?

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Solution

A coil ABCD mounted on an axel is placed between the pole N and S of a permanent magnet as shown in the figure.
The device commutator prevents the wires from twisting. More importantly, The commutator reverses the current at the exact instant when the amarture coil crosses the magnetic neutral axis. Commutator is necessary to maintain a unidirectional torque. Thus, The commutator converts direct current into alternating current. The commutator device is shown in the above figure.

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