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Homework Help: Synchronous generator

  1. Nov 18, 2015 #1
    1. The problem statement, all variables and given/known data
    Is there no residual magnetism in case of synchronous machines? Actually I had this doubt because of the OCC of alternator as when the field current is zero the generated value of the machine is also zero unlike the dc machines..why is it so??

    2. Relevant equations

    3. The attempt at a solution
    The OCC of a synchronous machine is plotted between the generated emf and field current ast rated speed .
  2. jcsd
  3. Nov 18, 2015 #2


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    Staff: Mentor

    The exciter (DC generator) can be designed to have residual magnetism, to make the machine self-excited and eliminate the slip-rings of separately excited.
  4. Nov 18, 2015 #3
    this doesn't answer my q. I was asking about if synchronous generator have residual magnetism?
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