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Armature reaction & Commutation

By Ashik




 Armature reaction:
          By Armature reaction is meant the effect of magnetic field set up by armature current on the distribution of flux under main poles of a generator.The armature magnetic field has two effects :
  1. It demagnetizes or weakens the main flux.
  2. It cross-magnetizes or distorts it .                                              
  









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