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Synchronous motor rotor excitation effect on current draw

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RudiB:
thanks for your advice guys, and for the scanned pages Schmitt Trigger, large power electrics really isn't my strongest subject I'm more of a digital electronics person.
Anyway, looking at the V curves, and having them explained, as my course notes make no attempt to explain V curves, would I now be right in saying that at 5a the power factor would be lagging at around 0.8 and the load would be inductive and that the motor would be under-excited, and that at 20a the power factor would be leading by over 0.8 and the motor would therefore be over-excited?

schmitt trigger:
Correct

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