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PICList Thread
'Generator - small'
1999\04\30@154324 by Steven Davidson

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I am looking for a small (.5 - 5W) generator I could use to power remote PIC
project using wind.  I can find small motors, but no generators on the Web.
Or the use of small motors as a generator?  Anyone with experience in these
areas??  Charging batteries with a small generator?

Thanks.

Steve

spam_OUTsdavidsonTakeThisOuTspamits.bldrdoc.gov
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1999\04\30@154956 by D. F. Welch

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At 01:42 PM 4/30/99 -0600, you wrote:
>I am looking for a small (.5 - 5W) generator I could use to power remote PIC
>project using wind.

How about bicycle generators?


>

Daniel F. Welch

Director
Research and Development
American Scientific Associates
Email: .....amersciKILLspamspam@spam@flash.net

1999\04\30@171958 by Michael Shiloh

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Look here:

   http://www.realgoods.com/

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{Quote hidden}

1999\04\30@180131 by Brian Whittaker

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Hi Steven
  Any permanent magnet DC motor will act as a generator.
.5 watt does that mean you need 5 volts at .1 amps if so then that would be a v
ery small motor.
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> {Original Message removed}


'Generator - small'
1999\05\01@002359 by Keith Schrader P.E.
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I believe Bike generators are actually magneto's, And the wont drive from
the wind
At least they were a jillion years ago
Regards
Keith

>At 01:42 PM 4/30/99 -0600, you wrote:
>>I am looking for a small (.5 - 5W) generator I could use to power remote
PIC
{Quote hidden}

1999\05\01@003320 by Dave VanHorn

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> I believe Bike generators are actually magneto's, And the wont drive from
> the wind
> At least they were a jillion years ago


They are usually AC output, if that's what you mean by magnetos.
They spin a permanent magnet in a winding.
There's no field control as in an alternator, so you get what you get.

They need some sort of blade arraingement to function as a windmill, but
I've seen this done, using a bicycle wheel, and plastic or metal between the
spokes to emulate the "american farm" type windmills. Not bad actually for
this application, it's cheap and easy, if not technically efficient.

1999\05\01@004930 by Bob Blick

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> They need some sort of blade arraingement to function as a windmill, but
> I've seen this done, using a bicycle wheel, and plastic or metal between the
> spokes to emulate the "american farm" type windmills. Not bad actually for
> this application, it's cheap and easy, if not technically efficient.

Hey, take this thread one step further. Surely some of you have seen a
"dynohub". They were popular on British bicycles in the 60's and early
70's. A "generator" built into the hub of a 26 inch bicycle wheel. Turn
one of those babies into a windmill!

Actually I have some experience with windmills. I wish you the best of
luck, but gently suggest that unless you have 20mph winds you'd do best to
consider other methods. Unless all you care about is kinetic sculpture,
not electric power.

How about solar power? Even if you are clouded over you'll get output from
amorphous cells. If you get any full sun you'll do better with regular
crystalline types.

Cheers, Bob

1999\05\01@085028 by Wagner Lipnharski

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> I am looking for a small (.5 - 5W) generator I could use to power remote PIC
> project using wind.

Is it imperative to use (aeholic?) wind energy ?
Why not use solar cell?  It is cheap, clean, easy to install. A small 2
x 2" cell can supply up to 6V 20mA in a bright sun...  In your case of
.5-5W, it would require a cell of aprox one sq ft to generate the 5W.
But the PIC circuit will consume 5Watts?

--------------------------------------------------------
Wagner Lipnharski - UST Research Inc. - Orlando, Florida
Forum and microcontroller web site:  http://www.ustr.net
Microcontrollers Survey:  http://www.ustr.net/tellme.htm

1999\05\01@085906 by kypros.vassiliou

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Hi Steve,
You can use a bicycles dynamo for the job, it provides between 3 and 6 watts.
The difficulty is  to construct the rest of the system (blates, gearbox etc.)

Regards
Kypros

Steven Davidson wrote:

{Quote hidden}

1999\05\01@092944 by Keith Schrader P.E.

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>> I believe Bike generators are actually magneto's, And the wont drive from
>> the wind
>> At least they were a jillion years ago
>
>
>They are usually AC output, if that's what you mean by magnetos.
>They spin a permanent magnet in a winding.
>There's no field control as in an alternator, so you get what you get.
>
>They need some sort of blade arraingement to function as a windmill, but
>I've seen this done, using a bicycle wheel, and plastic or metal between
the
>spokes to emulate the "american farm" type windmills. Not bad actually for
>this application, it's cheap and easy, if not technically efficient.


Now that I think about it you correct with the Magnet/ Field issue.  I do
rember when you tried to turn them by hand they went kinda thump thump, not
smooth at all.

Bike wheel, clever Idea

Regards
Keith

1999\05\01@094016 by Mike Keitz

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On Fri, 30 Apr 1999 21:48:02 -0700 Bob Blick <RemoveMEbobTakeThisOuTspamspamTED.NET> writes:

> I wish you the best of
>luck, but gently suggest that unless you have 20mph winds you'd do
>best to
>consider other methods. Unless all you care about is kinetic
>sculpture,
>not electric power.

I agree with Bob that there are relatively few places where the wind is
consistent enough to make a windmill feasible.  For such a small amount
of power, go with solar instead.


>How about solar power? Even if you are clouded over you'll get output
>from
>amorphous cells. If you get any full sun you'll do better with regular
>crystalline types.

I think it's the other way around.  Amorphous cells (brown in color, less
expensive) work well only in full sun.  Their output falls off rapidly in
cloudy conditions.  Crystalline cells (blue in color, more expensive),
decrease in output more linearly, producing better power in less than
full sun.

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1999\05\01@095059 by Peter van Hoof

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-----Original Message-----
From: Keith Schrader P.E. <EraseMEk2schrspamspamspamBeGoneIX.NETCOM.COM>
To: RemoveMEPICLISTKILLspamspamMITVMA.MIT.EDU <PICLISTSTOPspamspamspam_OUTMITVMA.MIT.EDU>
Date: Saturday, May 01, 1999 9:24 AM
Subject: Re: Generator - small


>>> I believe Bike generators are actually magneto's, And the wont drive
from
{Quote hidden}

That's because a bike generator (at least the old ones i know only have a
two pole magnet  running between a two pole coil so it will try to allign in
180 degree steps

Peter

1999\05\01@182212 by Gerhard Fiedler

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At 21:48 04/30/99 -0700, Bob Blick wrote:
>Hey, take this thread one step further. Surely some of you have seen a
>"dynohub". They were popular on British bicycles in the 60's and early
>70's. A "generator" built into the hub of a 26 inch bicycle wheel. Turn
>one of those babies into a windmill!

i've seen some like these sold in germany in the 90ies (new :).

ge

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