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I wasn't aware that some of the alternator-regulators were
given to the wobblies, over-excitability, or instability if not presented
with a battery as the load. My alternator puts out 6 cycles per revolution per
each phase. With a 3:1 drive ratio, and full wave rectification, that gives
about 1.5kHz per phase at 2500 rpm, which, with the phases interleaved, should
only give about 14% p-p ripple around the DC level. I would think that there is
enough input capacitance in the avionics attached to the buss to smooth this out
without the closed-loop system going into oscillation. I designed my own PWM
regulator with automatic-reset, series-OV protection, and I tested it into
different loads with no instabilities. I guess the alternator's field inductance
could drive a slow-responding regulator into the
heebie-jeebies!
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