DC Motors and Generators
OEET 120

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 DC Motors With Armature and Field Windings Connected to Separate DC Supplies

  • Increasing the armature current causes the motor to speed up.
  • Increasing the field current causes the motor to slow down.
  • An increase in the mechanical load causes an increase in the armature current.
 
DC Generators With Field Winding Powered by a Separate DC Supply
  • The output power comes from the armature windings.
  • Increasing the speed increases the armature voltage.
  • Increasing the field current increases the armature voltage.
  • Increasing the current coming out of the armature (by having a smaller load resistance) decreases the speed and the voltage.
  • Increasing the current coming out of the armature increases the torque required to maintain the same speed and voltage.
 
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