In case of dc motors , w eknow that ..we have a supply which supplies a current which divides into armature & field current for shunt motor...& the field current generates flux which links the armature winding & emf is induced.. but here I want to know the role of armature current .!! Armature current just increases the armature reaction which decrease the flux...but why then we want a larger value of armature current in motors..?? In generators obviously , armature current is responsible for field current which is further responsible for generating flux..!! But here in case of motor I can't understand the role of armature current!!