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Energy conversion difference in permanent magnet vs. field coil motor

  1. Apr 6, 2013 #1
    New here, hello all.
    My question is more about the field magnet in a running DC motor. First of all, does the current required to maintain a magnetic field change with the load on the motor? And if so, where would this "extra energy" come from in a permanent magnet DC motor?
  2. jcsd
  3. Apr 6, 2013 #2


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    The field winding has higher resistance then the armature winding (perhaps three orders of magnitude?). I don't believe the field current changes much with motor load.
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