Alternator

Discussion in 'Homework Help' started by Cerkit, Nov 17, 2010.

  1. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
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    3
    Hi I am trying to understand the operation of a basic alternator of 3phase 25 KVA generator. Can someone explain how self excitation works?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    That explanation is for a DC alternator. How does it work for an AC alternator?
     
  4. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    I guess what I am unsure about is how the AC configuration works. Is the magnetic field of the stator constant or is it changing direction?? If it changes direction how does the rotation of the rotor fit in in order to provide the required AC output to the load??
     
  5. JDT

    Well-Known Member

    Feb 12, 2009
    658
    85
    Normally the rotor is either a permanent magnet or an electromagnet energised by DC. As the rotor turns, the coils on the fixed stator experience a changing and reversing magnetic field and induce AC voltage.

    See:-
    http://en.wikipedia.org/wiki/Alternator
     
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