Thanks Jeff,Good clear description.
Bill Jacobs
------ Original message------From: Jeff Scott via KRnet Date: Mon, Jun 13, 2016
5:28 PMTo: krnet at list.krnet.org;Cc: Jeff Scott;Subject:Re: KR> Flywheel
alternators"Flywheel Alternators" are more aptly described as Dynamo Charging
systems.? They have fixed magnets that fly past a fixed Stator (coil or coils)
to produce AC current and either a single or 3 phase A/C Output that is then
rectified into DC.? A single phase unit either works or not as there are no
moving parts to wear out.? If a wire breaks in the stator or beetween the
stator and the regulator, it no longer works.? A 3 phase unit can lose a phase,
which will reduce its max current output.? I expect the Great Planes units are
likely single phase.? The regulator is where all the magic happens and where
problems are most likely to occur.? The regulator both rectifies the AC output
into DC, and regulates the DC to something less than 14.3 Volts.?Low voltage
output will almost always be the regulator that's at fault. No charging can be
either the regulator, wiring, or the dynamo stator wires that have failed.?The
failures I have seen in them were failed regulators, and burned wiring between
the dynamo and the regulator, and broken wires in the dynamo.? It is possible
that your regulator output may be affected by heat, but to what degree, I
couldn't predict.? Since these systems don't typically charge at idle, you need
to use a good voltmeter (preferably digital) and take a reading anywhere on the
12V DC buss with the engine turning somewhere around 1500 - 2000 RPM.? I don't
have any specific knowledge about the Great Planes units, so don't know what
RPM they cut in, but the ones on the Jabiru engines I've been working on seem
to start charging around 1800 rpm.? Once it's charging with minimal load, I
would expect to see something on the order of a minimum of 13V to maintain the
battery.? If it is less than that, they you are likely looking at a regulator
issue.? The dynamo itself will either work, or it won't.?-Jeff ScottLos Alamos,
NM?Sent:?Monday, June 13, 2016 at 2:02 PMFrom:?"Mike Stirewalt via KRnet"
To:?krnet at list.krnet.orgCc:?laser147 at juno.comSubject:?KR> Flywheel
alternatorsAnybody know if the flywheel alternators that are in the Great
Plainsengines wear out with time? It seems my voltmeter needle is ridingaround
11 volts instead of 12 with the engine at full RPM. It might bemy
imagination.If they DO wear out with time, what needs to be replaced? What
wears?I just aborted a trip to La Paz because the voltmeter needle seemed to
beriding a little lower than it usually does. I didn't want to be comingback
across the border without a working transponder so I landed in SanFelipe and
just came back home. Better safe than sorry. This alternatorsituation worries
me but it might be just fine and my imagination theproblem, not the alternator.
It's got a lot of hours on it - theflywheel alternator I mean - and am
wondering if I've got a
problemdeveloping.Thanks,MikeKSEE____________________________________________________________Affordable
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