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Alternator has DC field which generates constant magnetic field in Armature. Generator has permanent magnet which generates constant magnetic field in stator. 12. In alternator we take supply from its stator. In generator we take supply from rotor. It is a major difference between alternator and generator.
Occasionally, a linear alternator or a rotating armature with a stationary magnetic field is used. In principle, any AC electrical generator can be called an alternator, but usually the term refers to small rotating machines driven by automotive and other internal combustion engines.An alternator that uses a permanent magnet for its magnetic field is called a magneto.Alternators in power stations driven by steam turbines are called turbo-alternators.n alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current.