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At 03:03 PM 2/24/2005 -0500, you wrote:
My premise may be way off, but isn't the open lead output voltage linear
with RPM? So my thinking goes, if you get charging voltage at idle of
1000, it will be 6 times higher (over 70V) at a cruise RPM of 6000.
This is true, but that is corrected with the electronics in the regulator. It is a lot like your laptop power supply that doesn't care if it is plugged into 120 volts or 240 volts.
The Yellow Daisy it is! You are correct in your assumption that the POTENTIAL output increases with RPM but it isn't really linear.
Actually, at the same current draw, the output voltage of the unregulated PM alternator is a linear function of the RPM. It is called the "Motor Constant."
Something to do with internal coil hysteresis or histowhatsit.
Makes some difference, but it is generally not huge. It can be significant on really cheezey alternators, but they would overheat badly at sustained high RPM.
We should look at the raw, open circuit, stator voltage as a function of RPM, just to be sure that the stator will NOT overheat at sustained high RPM.
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