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there are a few cars with clutches on the alternators, one is the GM opel/holden Vectra, not sure which year. An Alternator generates a constant 15V or so, and Flux density of the field depends on this and is inversly proportional to the speed, so it decreases with increasing speed. However losses at a constant flux increase with speed, so the relationship is complicated as these are not linear. Magnetic losses don't change with load if everything else is constant.
My thinking with the electric fan is that it is controlled with the rotor current, maybe just driven off the AUX terminal in the alternator that powers the voltage regulator, then when it is charging it will run, that supply to both regulator and fan is disconnected via a relay to disable the alternator.
I have tried mechanically disconnecting the alternator with the thermo fan and P/S with good results, in another post. I have not found a practical way of supplying power to the battery though.
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