I dont know how many fields there are in a stator.
But in a auto [12 volt system],,the ALT carry 5.
the more stuff you have turn on and are useing,,the more fields open up to keep up with the demand,,,,an average standard ALT is about 56 amps,,A luxurary car or anything all power,,the %T is ussualy 130 in that area,105,,,
If you run a amp/volt check on a car to see if the ALT is weak or not big enough to carry the Load,,,ie;guys installing big amps and subs in their cars.
The ALT will not be able to keep up and fail,,so an ALT upgrade is always recommended when setting up a high powered stereo system,
An autos system although is a 12 volt ,,should at idle be feeding 14 volt back into it,,to supply the needs of the car,,and to keep the battery topped off,,,,,,run a meter,,,find out the spec's of the stator,,and do the math,,,that easy,,,,BTW,,,,Sounds like your fine,,,,remember the watts are to be consideered,,its the amps that are drawing that will do the damage,,,be safe and run a test,,,,,,,best wishes,,,,,bobber