Characteristics of DC generators

Following are three important characteristics of dc generators :

No load saturation characteristics (Eg Vs I f)

  • It is also called open circuit characteristics or magnetic characteristics. It gives the relationship between no load generated emf in armature Eg and field current If
    At gives fixed speed.

  • It is just like magnetization curve for the material of the electromagnets.
  • Its shape is practically same for all generators whether self. Excited or separately excited.

Internal characteristics(Eg verses Ia)

  • It gives the relation between emf generated Eg (after reducing armature reaction drop) and armature current Ia

External characteristics (V versus IL)

  • It gives the relation between terminal voltage V and loads current IL. This characteristic considers both the drop, armature reaction drop and armature resistance drop on Y axis where terminal voltage is represented.

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