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Speed/field current relationship of a dc machine

  1. Apr 21, 2006 #1
    Im having trouble explaining this relationship.......from my graph i know that if armature voltage is held constant then the field current will decrease exponentially for increasing speed. But why???
     
  2. jcsd
  3. Apr 23, 2006 #2

    Cliff_J

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    Science Advisor

    The windings have inductance and as you increase the speed the more that inductance plays a role in the impedance.
     
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