Today's Message Index:
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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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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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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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Subject: | Re: Schematic for twin PM alternators |
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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Subject: | Re: Schematic for twin PM alternators |
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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Subject: | Re: Schematic for twin PM alternators |
> 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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