What is the primary function of a commutator in a current carrying coil within a magnetic field?

The primary function of a commutator in a current carrying coil within a magnetic field is to ensure that the direction of the current in the coil is reversed at the appropriate times in order to maintain a consistent rotation of the coil within the magnetic field. This reversal of current direction allows the coil to continue to experience a force that causes it to rotate, resulting in the generation of electrical energy.

To periodically reverse the direction of current flow in the coil