Another advantage of using permanent magnet is that, generator speed would be directly proportional to the terminal voltage.Alternators that use permanent magnets would be costly when compared to other types of alternators.With the existence of permanent magnets over rotor windings, magnetizing current generated within rotor would avoid losses.Control over the generated voltage is established by the varying current in the rotor field winding.In the case of automotive alternators, the rotor windings would control the voltage generated by the alternator.Rotor magnetic field would be induced with the help of fixed field windings and moving rotor poles.Brushless AC generators can be seen in Heavy Duty forklift trucks.These two would work together with either a permanent magnet or rotor windings to induce an electromagnetic field. In this type of alternator, there exist brushes and slip rings. Brushless alternators can also be found in the market.3 phase electric current generated in the 3 sets of stator windings would be displayed from one another by one-third of a period. Stator windings would be distributed in the form of 3 sets and this is mainly to generate a 3 phase electric current.Rotating magnetic field formed in the rotor would result in the occurrence of AC voltage in the stator windings.When a magnetic field cuts across the conductor, electromagnetic force, shortly known as EMF, would be generated and this force would make the rotor to rotate.Stator is an iron core and this is where the coils would be located.Rotating magnet termed as rotor would revolve around couple of fixed conductors, which would be wound in coils.Alternator conductor would produce electric current whenever the magnetic field revolving around the conductor changes. In this case, the alternator would be driven by steam turbines.
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