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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.
Though you could call them the same device, a generator and an electrical motor are really more like two sides of the same coin. A generator converts mechanical energy into electrical energy, while a motor does the opposite-it converts electrical energy into mechanical energy. Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.