What does the commutator of a generator do?

The commutator of a generator is a critical component that facilitates the conversion of alternating current (AC) generated in the windings into direct current (DC) for the load. When the generator rotates, the magnetic field induces an alternating current in the windings. The commutator acts as a mechanical switch that periodically reverses the connection of the coils to the external circuit, ensuring that the current flowing to the load is always in one direction. This process effectively transforms the alternating current generated in the coils into a usable direct current output.

This function is essential in applications where a stable DC output is required, such as in battery charging and in powering various aircraft systems that depend on DC power for operation. Understanding the role of the commutator is fundamental for recognizing how generators produce DC power efficiently while relying on the principles of electromagnetic induction.