\[\text I_{s f}=\frac{\text{N}_{\text{se}}}{\text{N}_{\text{f}}} \text{I}_{\text{a}}-(\frac{\text { Armature reaction } \text{MMF}}{\text{N}_{\text{f}}})\]
rentially compounded DC generator
\[\text I_{s f}=\frac{V_{x}}{R_{f}}\]
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