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In DC motor,the field MMF is given by NI.N-no.of field
winding turns,I-excitation and both are constant.Then how
could the main flux decreases due to armature reaction.
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Answer Posted / vivin
This armature reaction has two effects
i)demagnetising the field flux(The direction of the flux
around armature conductors can be inferred from the fleming
RH rule)
i))Distortion of the field flux becoz it is in diferent
direction withrespect to main field flux.
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