Electrical Engineering - Alternator and Generator

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Alternator and Generator

What is the diffrence between Altrnator & Generator? Outline its working principal.

Total Answers and Comments: 2

Last Update: August 28, 2008 Asked by: jangra gautam haluwas

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August 14, 2008 06:35:19

suchayandas

Member Since: August 2008 Contribution: 3

RE: Alternator and Generator

1.Alternators are used in automobiles to charge the battery and to power all the car's electric systems when its engine is running. Alternators have the great advantage over direct-current generators of not using a commutator, which makes them simpler, lighter, and more rugged than a DC generator. The stronger construction of alternators allows them to turn at higher speed, allowing an automotive alternator to turn at twice engine speed, improving output when the engine is idling. The availability of low-cost solid-state diodes from about 1960 allowed auto manufacturers to substitute alternators for DC generators. Automotive alternators use a set of rectifiers (diode bridge) to convert AC to DC. To provide direct current with low ripple, automotive alternators have a three-phase winding.

2.Alternator puts out voltage when it needed. But,generator puts out voltage all the time.

3.Alternator produces Alternating Current.But,Generator produces Direct Current.

4.Alternator consist no commutator,and due to absense of commutator it's simpler than generator.

5.Alternator construction is more stronger than dc generator.

6.Alternator use only those energy which is needed.So,it save energy.Where Generator use all those energy which is supplied.There is no save of energy.So using alternator is more profitable than generator in the purposes.

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August 28, 2008 00:30:58

Abhijit_atrangi

Member Since: July 2008 Contribution: 16

RE: Alternator and Generator

Alternator and Generator have the same principle of electromagnetic induction but Generator has the stationary magnetic field and rotating conductor which rolled on the armature with slip rings and brushes ride against the slip rings which is convert the induced emf to the dc current for external load

In Alternator the armature is stationary and magnetic field is rotating but for low voltage output we have the rotating armature and stationary filed, for high voltage output we have to use the general design of the alternator

High voltage alternator has the rotating field because in rotating armature pattern requires the slip ring and brush to connect the induced emf to the external load but in high voltage it is impossible to isolate the slip ring and brush result in short ckt producing high voltage thats why high voltage alternators have the rotating magnetic field.

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