What are the major differences between the AC generator and DC generator?
The major difference between an AC generator and a DC generator is that the DC generator requires a mechanism to provide a DC output. This can be done mechanically with a commutator or electronically with a rectifier. Internally, all generators produce an alternating voltage. All generators require a magnetic field. The field can be provided by permanent magnets or by a DC current that the generator produces itself. If the generator produces its own magnetic field, it can be initially put into operation using residual magnetism or by initially generating the field with an external power source. The only type of generator that uses a type of AC field excitation is an induction generator, essentially an induction motor operating as a generator. Power station generators generally have the DC field winding on the rotor with excitation current supplied through slip rings. Three phase windings on the stator provide three phase output power. Automotive alternators are similar but they have a
