Why should it ? I don´t care if the generator does 50 V , would be a pity if it wastes all power by dumping it into heat when exceeding 14 V . So my guess I can get more power out of it when it is able to go a lot higher and in next stage convert it to 13.8 V for battery charging. How the converter does it I don´t know, its the converter´s job. Anyway, heat is NO concern with my setup, neither in the windings nor in the two electronic boxes - at no real costs and so simple to connect.
The square motor above does a lot more power than the Alton, above 200 W at ca. € 70.- with postage. My final finish this week for these on the Vincent engine is below - to look more traditional. Smaller than the Miller dynamo and multiple power at 14 V , no brushes. Got two motors in two lengths, same cross section. The longer type is way more powerful than I´ll ever need. Sorry, no photo of the longer type, same look, just longer.
I´d be interested to hear about connecting the boxes to an Alton and what power they can do, one two three phase does not matter.
Vic