Originally posted by Rakarskiy
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Refer to the attached diagrams and equations, found in so many textbooks.
The explanation you seek concerns the difference in the terminal voltage between loaded and no-load conditions. It is obvious that difference is the two terms containing the armature current, jIAXS and IARA. For the no-load or open circuit terminal voltage, Vt, equals EA. Under load, IA is present and there is a voltage drop in the armature winding and reactance so Vt is lower than EA.
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