Re: Generator Brushes and Adjustment and How It Works
As Tom mentioned, the output will fall of slightly after peak output. The reason for this is quite interesting...
While the voltage from a generator depends on how fast the flux is changed (d phi /dt or faraday's law) and should increase as the speed increases, the designer of the Model A generator added some features that would reduce the "magnetic flux" as the field current increased thus reducing the effect of the faster flus change. For example, the shape of the iron in the field around the gap between the poles was changed to "self limit" or saturate as the field as it got too strong.
What the engineers were trying to do was make the output as constant as possible without using a mechanical voltage regulator.
Marc
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