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Homework Help: Synchronous machine

  1. Dec 14, 2015 #1
    1. The problem statement, all variables and given/known data
    I studied that a larger air gap in alternators aids in sinusoidal mmf distribution ..I didn't get this as larger air gap should deteriorate the wave..but here it is opposite..?? Is it right ??

    2. Relevant equations

    3. The attempt at a solution
    One point can be said that larger air gap improves the stability limit of synchronous machines ..
  2. jcsd
  3. Dec 15, 2015 #2

    rude man

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    Homework Helper
    Gold Member

    In general, a larger air gap puts more of the loop mmf in the gap and less in the highly unstable, non-linear and unpredictable metal. The air gap reluctance is a very stable L/μ0A with L = gap length and A = gap area. It's approximate since it ignores fringing effects but it's very stable and linear with flux, so avoiding harmonic generation. There will of course be a commensurate loss of flux for a given mmf.
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