ELECTRICAL MACHINERY-in DC machins, when we model it...?

in DC machins, when we model it, why we don't show a voltage source in the side of Field (which shows the "induction of armature on the field")??please for more cantact and discussion check out of your E-mail address...Tanks alot
"> not really sure what you are looking at but sometimes these 'models' or 'hybrid circuits' are accurate enough.

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