Gilles.Thesee wrote:
>
> Fred,
>
> Would you mind sharing with us the regulator schematics you have ?
I have only the one, plus the internal photos, which you shared with me; nothing
independent of that.
> We've been conducting some investigation into the Rotax regulators, and they
> appear to be far from cleverly engineered.
[Nerdy tech stuff follows]
By clever I meant it's an SCR shunt regulator, but they don't use a bridge
rectifier,
which is not fail-safe because the ground return is hard-wired. But here
each SCR alternately provides its sibling's ground reference during the period
it is letting a half-cycle of AC pass. If one SCR opens or shorts, output
will be seriously reduced. Another failure mode is ground reference totally
severed,
so B+ just floats in space, effectively zero output.
However, your engineer friend may be better at this stuff, with less chance of
being wrong!
> Even at 10 A, half the advertised 20 A rating, the unit gets notably
> hot.
Is is cooler at around 15A? A shunt regulator can be and if so, a good excuse
for more avionics?
Reg,
Fred F.
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