The Induction Generator is provided with two windings, one on the stator, and one on the rotor. The stator winding of the induction motor has two functions. It provides the excitation or magnetisation, and carries the armature or generated current. The rotor winding carries the armature current only. When AC excitation is present, the magnetic field created rotates at a speed determined jointly by the number of poles in the winding and the frequency of the current, the synchronous speed.
If the rotor rotates at a speed other than the synchronous speed, voltage is generated in the rotor winding at a frequency corresponding to the difference in the two frequencies, known as the slip frequency. This voltage drives the armature current, and provided the rotor speed is faster than the synchronous speed, the machine acts as a generator. The function is thus asynchronous.
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