Synchronous Behavior of Doubly Fed Twin Stator Induction Machine

An induction machine, fitted with two independent sets of windings on the stator, and two suitably interconnected sets of rotor windings, can be used as a variable speed machine in which the slip power from the rotor circuits is transferred by induction to one set of stator windings. From these it can be returned to the supply via a low power frequency converter which handles slip power only.