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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.
An alternator is just another name for a synchronous generator. Excitation is needed to create a magnetic field in the rotor. When to rotor is spun with excitation the magnetic field will cut through the stator field and produce an AC voltage in the stator field. In terms of an alternator with built in rectifier the stators AC voltage in the rectified to DC. The strength of excitation will determine the alternators output voltage.