Types of AC Generators:

As previously described, there are two categories of AC generators: the stationary field, rotating armature; and the     rotating field, stationary armature.

Small AC generators commnly have a stationary field and a rotating armature  show in the figure. One important drawback to this arrangement is in which the slip-ring and brush assembly is in series along with the load circuits and, since of worn or dirty components, might interrupt the flow of current.

Figure: Stationary Field, Rotating Armature