Is an electric machine that converts machine energy to electric energy in the form of alternating current?
An alternator is exactly the same as that dc generator. In fact all the generators alternators is which alternating voltages are set-up and it is the commutator which converts this ac into dc.
In the dc generator, it is essential for the armature to rotate in the magnetic field produced by the stationary magnetic field to give the unidirectional voltage. However in alternator it is not essential for the armature to rotate and either the armature or field can be made to rotate while the other is kept constant. But nowadays, armature is kept stationary and the field rotates under it.
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