This is a problem I have experienced in my Revmaster VW.Years ago mine was not charging.But it never seemed to go dead just low voltage.Removed the rotor and sent it to Revmaster for a recharge of the magnets.They sent it back and the magnets were much stronger and the charge rate when up to a healthy 14 volts.After years of use,the charge rate went back down.Rev master no longer recharges the magnets but I decided to buy a new rotor,not cheap.The new ones are made with much better material and will last longer.I do think my aircraft has out lived it's life expectancy.Tommy W.
On Mon, Jun 13, 2016 at 4:33 PM, billjacobs386 at yahoo.com < krnet at list.krnet.org> wrote: > > > > > > > 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 > Wireless PlansSet up is easy. Get online in minutes.Starting at only $9.95 > per month! > www.netzero.net?refcd=nzmem0216[http://www.netzero.net?refcd=nzmem0216]_______________________________________________Search > the KRnet Archives at > http://tugantek.com/archmailv2-kr/search[http://tugantek.com/archmailv2-kr/search].To > UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.orgplease > see other KRnet info at > http://www.krnet.org/info.html[http://www.krnet.org/info.html]see > http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org[http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org] > to change options_______________________________________________Search the > KRnet Archives at http://tugantek.com/archmailv2-kr/search.To UNsubscribe > from KRnet, send a message to KRnet-leave at list.krnet.orgplease see other > KRnet info at http://www.krnet.org/info.htmlsee > http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options >
