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Doubly fed induction generator (DFIG), a generating principle widely used in wind turbines. It is based on an induction generator with a multiphase wound rotor and a multiphase slip ring assembly with brushes for access to the rotor windings. It is possible to avoid the multiphase slip ring assembly, but there are problems with efficiency, cost ...
Unlike the DFIG, the FRC can employ a squirrel cage rotor in the generator; an example of this is the Siemens SWT 3.6-107, which is termed the industry workhorse. [7] An example of a permanent magnet generator is the Siemens SWT-2.3-113. [8] A disadvantage of a permanent magnet generator is the cost of materials that need to be included. [9]
This paper from MIT shows a doubly fed wind turbine generator, but from Fig. 5, the field windings only consume power; they don't generate it. That's the way generators usually work; power goes into the field windings to create a magnetic field, and power comes out of the armature, rotating relative to the field.
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A permanent magnet synchronous generator is a generator where the excitation field is provided by a permanent magnet instead of a coil. The term synchronous refers here to the fact that the rotor and magnetic field rotate with the same speed, because the magnetic field is generated through a shaft-mounted permanent magnet mechanism, and current is induced into the stationary armature.