Refers to changing current direction in motors or generators to maintain rotation. When the commutator wears out, the motor will begin to malfunction.
Pro Tip 2/3
Machine Maintenance
Mentioning a commutator often implies the need for electrical maintenance or repair work. He spent the afternoon repairing the commutator to get the generator running.
Pro Tip 3/3
Physical Component
In engineering context, 'commutator' is a tangible part of a machine's hardware. We had to order a new commutator for the old electric train set.