# How Armature reaction is different from Self inductance?

It was given in "Electric machinery Fundamentals" by Stephen J. Chapman book that Armature reaction and self inductance is different. Contribution from armature reaction is considered as voltage drop $jXI_{A}$, with reasoning that $B_{stator}$ produced by current through stator coils would induce voltage $E_{stator}$. Later as shown in the image attached, net reactance is taken as $X + X_{A}$, $X_{A}$ being self inductance. What I don't undertsand is, how armature reactaion is different from self inductance ?