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Originally Posted by DannoXYZ
This is only true if you short AC coils to ground. However in way circuit is arranged, AC coil goes through rectifier first. Then output of rectifier is grounded, not the coil. So AC coil is never shorted to ground. In which case, AC coils are loaded 100% at all times.
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Shorting the output of the bridge is almost the same as shorting the AC. The only difference is the 0.4v Schottky diode drop.
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Also notice that shunt-circuit RR uses linear-regulator that divides voltage, not current.
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As I said above, the ones I build are switching, but are shunt regulators. They either fully short via a big HexFET or they let full current though. All my statements about heat, etc., have been verified on my test bench (motorized PM alternator).
That stator above is burned in only one area, as if one coil had a shorted turn, got hot and failed, and heated up the nearby coils to some extent.