AeroElectric-List Digest Archive

Fri 01/15/16


Total Messages Posted: 5



Today's Message Index:
----------------------
 
     1. 06:54 AM - Re: Re: Schematic for twin PM alternators (Robert L. Nuckolls, III)
     2. 06:57 AM - Re: Re: Electrical system design critique (Robert L. Nuckolls, III)
     3. 08:14 AM - Re: Schematic for twin PM alternators (user9253)
     4. 02:41 PM - Re: Re: Schematic for twin PM alternators (Paul Eckenroth)
     5. 05:24 PM - Re: Schematic for twin PM alternators (user9253)
 
 
 


Message 1


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    Time: 06:54:57 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Schematic for twin PM alternators
    At 04:02 PM 1/14/2016, you wrote: >Joe =C2 Thanks for the links.=C2 I see a number of >schematics for PM alternator based systems.=C2 I >need to study each and then make a list of >components and questions.=C2 I'm sure that what I >need will be based on what has already been >done.=C2 Charlie is right that the other >alternator hook up is same as what is >shown.=C2 Bob is asking about manuals.=C2 I don't >think that either Sonex or Revmaster has manuals >beyond the very basic.=C2 I believe they both use >a non-adjustable rectifier/regulator with no >further controls other than fuse and switch. =C2 It appears that Revmaster has incorporated TWO stator windings not unlike those on the Rotax 912/914. Further, I read references to alternator outputs of 18A and 18A, and 30A in another place. When offering this 'novel' product, it is incumbent on the producer to describe its capabilities, limits and recommended integration techniques. It's pretty cool that the manufacturer has been able to up-size their DC generation capabilities . . . the 912/914 has been sota gasping for watts since day-one. On the other hand, just how one integrates TWO separate sources is unclear. Does anyone on the List have a factory installation manual for this engine? Those excerpts in Contact are, as some have noted, more confusing than illuminating. I will suggest that studying anything published in the 'Connection will be of limited value until we understand exactly what's installed on the engine and how the manufacturer intended that it be used. Bob . . .


    Message 2


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    Time: 06:57:47 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Electrical system design critique
    At 08:51 PM 1/14/2016, you wrote: > >Oh... That fusible link. I think I might have taken one of Bob's >drawing too literally. That's what it shows on the z13/8 in my >version of aeroelectric connect. A 20 AWG fusible link for a 14 AWG wire. In ONE PLACE ONLY . . . the extension of the main bus to the crowbar OV breaker . . . and this only in some sense of deference to design philosophies on TC aircraft. I may remove all references to fusible links in Rev 13 . . . Bob . . .


    Message 3


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    Time: 08:14:08 AM PST US
    Subject: Re: Schematic for twin PM alternators
    From: "user9253" <fransew@gmail.com>
    Attached is a drawing that I made of a possible way to wire the Revmaster dynamo. It is based on limited information available about the Revmaster. Suggestions and criticism welcome (as long as you are not too hard on me). :-) -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=452004#452004 Attachments: http://forums.matronics.com//files/revmaster_317.dwg http://forums.matronics.com//files/revmaster_133.pdf


    Message 4


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    Time: 02:41:56 PM PST US
    Subject: Re: Schematic for twin PM alternators
    From: Paul Eckenroth <N509RV@eckenroth.com>
    I do have the Revmaster installation manual and the picture previously sent of the stator connections to the rectifier/regulator is the only reference to wiring the alternators. I believe it is intended that both alternators feed the battery at the same time. I do have a few questions: What is the downside of both alternators connected to the battery at the same time. What is the purpose of the capacitor. If the crowbar disconnects a generator from the battery what happens. Is there any harm to the generator. Paul On Fri, Jan 15, 2016 at 9:52 AM, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 04:02 PM 1/14/2016, you wrote: > > Joe =C3=82 Thanks for the links.=C3=82 I see a number of schematics for PM > alternator based systems.=C3=82 I need to study each and then make a lis t of > components and questions.=C3=82 I'm sure that what I need will be based on what > has already been done.=C3=82 Charlie is right that the other alternator hook up > is same as what is shown.=C3=82 Bob is asking about manuals.=C3=82 I do n't think > that either Sonex or Revmaster has manuals beyond the very basic.=C3=82 I > believe they both use a non-adjustable rectifier/regulator with no furthe r > controls other than fuse and switch. =C3=82 > > > It appears that Revmaster has incorporated > TWO stator windings not unlike those on the > Rotax 912/914. Further, I read references > to alternator outputs of 18A and 18A, and 30A > in another place. > > When offering this 'novel' product, it is > incumbent on the producer to describe its > capabilities, limits and recommended > integration techniques. > > It's pretty cool that the manufacturer > has been able to up-size their DC generation > capabilities . . . the 912/914 has been > sota gasping for watts since day-one. On > the other hand, just how one integrates > TWO separate sources is unclear. > > Does anyone on the List have a factory > installation manual for this engine? Those > excerpts in Contact are, as some have noted, > more confusing than illuminating. > > I will suggest that studying anything published > in the 'Connection will be of limited value > until we understand exactly what's installed > on the engine and how the manufacturer intended > that it be used. > > > Bob . . . >


    Message 5


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    Time: 05:24:49 PM PST US
    Subject: Re: Schematic for twin PM alternators
    From: "user9253" <fransew@gmail.com>
    > What is the downside of both alternators connected to the battery at the same time. If the outputs from both alternators are exactly in phase with each other, then I suppose that they could be connected in parallel to a rectifier/regulator. The alternators may very well be in phase (if the wires are not connected backwards) because they are excited by the same rotating magnets. I do not understand how the alternators are connected to the rectifier/regulator in the picture that you posted. AC voltage can not be connected directly to a battery. The AC needs to be rectified and regulated first. The alternator coils can be damaged if not wired correctly. The trial and error method should not be used. > What is the purpose of the capacitor. The output voltage from a rectifier/regulator is pulsing DC. A capacitor tries to smooth out the pulses. A flywheel on an engine is analogous to a capacitor in a circuit. They each smooth out pulses. > If the crowbar disconnects a generator from the battery what happens. Is there any harm to the generator. I do not think so, but will leave that for others to answer. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=452010#452010




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