Doubly fed electric machine
Electric motor / From Wikipedia, the free encyclopedia
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Doubly fed electric machines, also slip-ring generators, are electric motors or electric generators, where both the field magnet windings and armature windings are separately connected to equipment outside the machine.
By feeding adjustable frequency AC power to the field windings, the magnetic field can be made to rotate, allowing variation in motor or generator speed. This is useful, for instance, for generators used in wind turbines.[1] Additionally, DFIG-based wind turbines offer the ability to control active and reactive power.[2][3]