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Gilles.Thesee(at)ac-greno
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 Posted: Thu Jun 08, 2006 8:42 am Post subject: 28 V dynamo question |
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Hi Bob and all,
A buddy is asking about the Scintilla 28 V 300 W dynamo on his LOM engine.
Does anyone know of a suitable voltage regulator at a reasonable price ?
He says the one on the Moravia website is much too expensive.
Some builders have suggested connecting the dynamo to the battery direct
via a diode, and devise a simple regulator with a transistor and some
simple components.
I recall intricate devices with vibrating coils, shunt and series
coils, cutout adjustment, etc.
Have things become so simple today ?
Any input appreciated,
Regards,
Gilles Thesee
Grenoble, France
http://contrails.free.fr
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nuckollsr(at)cox.net
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| Posted: Thu Jun 08, 2006 10:15 am Post subject: 28 V dynamo question |
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At 06:39 PM 6/8/2006 +0200, you wrote:
| Quote: |
<Gilles.Thesee(at)ac-grenoble.fr>
Hi Bob and all,
A buddy is asking about the Scintilla 28 V 300 W dynamo on his LOM engine.
Does anyone know of a suitable voltage regulator at a reasonable price ?
He says the one on the Moravia website is much too expensive.
Some builders have suggested connecting the dynamo to the battery direct
via a diode, and devise a simple regulator with a transistor and some
simple components.
I recall intricate devices with vibrating coils, shunt and series coils,
cutout adjustment, etc.
Have things become so simple today ?
|
The last data I had on the LOM power generation of choice
showed a classic, wound field generator wired per Figure Z-18
An electro-mechanical regulator for this generator would
look something like this:
http://www.aeroelectric.com/Pictures/Regulators/GenReg_2A.jpg
There ARE solid state replacements for generators but these
are much more difficult to build than for alternators.
Generator regulators need reverse current cutout relay
or diode, current sense and limiting in addition to the
voltage regulating duties. See chapter 3.
This cannot be done with simple circuitry. Further, the
generators are generally slower in their response to
changes in applied field voltage. Regulators tend
to be more specific to the type of generator while
alternator regulators generally work with a wide range
of alternator sizes and brands.
Short answer is that one can PROBABLY craft a suitable
regulator from pieces and parts but the $time$ invested
would most certainly exceed the $time$ required to
purchase the off-the-shelf part. I doubt that any of
my clients of past years would even consider
bringing a modern generator regulator to the market.
The market is too narrow and expenses are breathtaking.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Thu Jun 08, 2006 10:35 am Post subject: 28 V dynamo question |
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Quoting "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>:
| Quote: | > There ARE solid state replacements for generators but these
are much more difficult to build than for alternators.
Generator regulators need reverse current cutout relay
or diode, current sense and limiting in addition to the
voltage regulating duties. See chapter 3.
|
Zephtronics makes a very nice generator controller. G1500N off the top
of my head. I have one on my Mooney. Rock solid 14.1 V from about 1100
rpm up.
Do not archive
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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Gilles.Thesee(at)ac-greno
Guest
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| Posted: Thu Jun 08, 2006 11:08 am Post subject: 28 V dynamo question |
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Bob,
Thank you for your quick reply.
That's the beast I encountered years ago on British motorcycles and old
Cessna or Piper twins.
| Quote: |
Short answer is that one can PROBABLY craft a suitable
regulator from pieces and parts but the $time$ invested
would most certainly exceed the $time$ required to
purchase the off-the-shelf part.
I'll pass on the info to my buddy.
|
Thanks again,
Regards,
Gilles
http://contrails.free.fr
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Gilles.Thesee(at)ac-greno
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| Posted: Thu Jun 08, 2006 11:19 am Post subject: 28 V dynamo question |
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Kelly McMullen a écrit :
| Quote: |
<kellym(at)aviating.com>
Quoting "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>:
>> There ARE solid state replacements for generators but these
> are much more difficult to build than for alternators.
> Generator regulators need reverse current cutout relay
> or diode, current sense and limiting in addition to the
> voltage regulating duties. See chapter 3.
>
Zephtronics makes a very nice generator controller. G1500N off the top
of my head. I have one on my Mooney. Rock solid 14.1 V from about 1100
rpm up.
Do not archive
http://www.matronics.com/Navigator?AeroElectric-List
http://wiki.matronics.com
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Gilles.Thesee(at)ac-greno
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| Posted: Thu Jun 08, 2006 11:33 am Post subject: 28 V dynamo question |
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Kelly McMullen a écrit :
| Quote: |
Zephtronics makes a very nice generator controller. G1500N off the top
of my head. I have one on my Mooney. Rock solid 14.1 V from about 1100
rpm up.
Kelly,
|
Thank you for your reply.
Please pardon my previous empty message. Must have hit the wrong key.
Would you care to give some further info on your aircraft model, or type
of engine, as they are required to search their website ?
Thanks,
Regards,
Gilles
http://contrails.free.fr
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Thu Jun 08, 2006 11:35 am Post subject: 28 V dynamo question |
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This might help:
http://www.aircraftspruce.com/catalog/eppages/gencontrolunit.php
There is a 28V version there.
Quoting Gilles Thesee <Gilles.Thesee(at)ac-grenoble.fr>:
| Quote: |
<Gilles.Thesee(at)ac-grenoble.fr>
Kelly McMullen a écrit :
>
> <kellym(at)aviating.com>
>
> Quoting "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>:
>
>>> There ARE solid state replacements for generators but these
>> are much more difficult to build than for alternators.
>> Generator regulators need reverse current cutout relay
>> or diode, current sense and limiting in addition to the
>> voltage regulating duties. See chapter 3.
>>
>
> Zephtronics makes a very nice generator controller. G1500N off the
> top of my head. I have one on my Mooney. Rock solid 14.1 V from
> about 1100 rpm up.
> Do not archive
>
> http://www.matronics.com/Navigator?AeroElectric-List
> http://wiki.matronics.com
>
>
http://www.matronics.com/Navigator?AeroElectric-List
http://wiki.matronics.com
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Thu Jun 08, 2006 11:58 am Post subject: 28 V dynamo question |
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Well, I typoed...
it is www.zeftronics.com
my aircraft ia '65 Mooney M20E with Lycoming IO360. However it is a
14V application.
The link I sent a few minutes ago has the 28V version, found at
Aircraft Spruce.
Quoting Gilles Thesee <Gilles.Thesee(at)ac-grenoble.fr>:
| Quote: |
<Gilles.Thesee(at)ac-grenoble.fr>
Kelly McMullen a écrit :
>
> Zephtronics makes a very nice generator controller. G1500N off the
> top of my head. I have one on my Mooney. Rock solid 14.1 V from
> about 1100 rpm up.
Kelly,
Thank you for your reply.
Please pardon my previous empty message. Must have hit the wrong key.
Would you care to give some further info on your aircraft model, or
type of engine, as they are required to search their website ?
Thanks,
Regards,
Gilles
http://contrails.free.fr
http://www.matronics.com/Navigator?AeroElectric-List
http://wiki.matronics.com
|
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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Gilles.Thesee(at)ac-greno
Guest
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| Posted: Thu Jun 08, 2006 12:44 pm Post subject: 28 V dynamo question |
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Kelly McMullen a écrit :
| Quote: |
<kellym(at)aviating.com>
Well, I typoed...
it is www.zeftronics.com
my aircraft ia '65 Mooney M20E with Lycoming IO360. However it is a
14V application.
The link I sent a few minutes ago has the 28V version, found at
Aircraft Spruce.
|
Kelly,
Thanks for the info.
Regards,
Gilles
http://contrails.free.fr
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