All Rotary Converters and Motor-Generators

Machines that convert electrical power from one form to another using rotating parts, namely rotary converters and motor-generator sets. A technology belongs here when its cited article describes such a machine. Both kinds of machine join a motor and a generator or a rotating switch into one system, so that power arrives in one form and leaves in another, for example as direct current from alternating current or at a different frequency. They were common before solid-state electronics and are placed here by the cited article.