Re: slow rpm dc motor
- From: John Nagle <nagle@xxxxxxxxxxx>
- Date: Mon, 28 May 2007 23:50:12 -0700
apothus@xxxxxxxxx wrote:
On May 26, 11:18 am, retiredmy...@xxxxxxxxx wrote:
I would like info on slow rpm dc motors that can turn satellite dish
used to track sun ( solor power )
If you want to track the sun, build a sun tracker. Edmund Scientific
has a little one here:
http://scientificsonline.com/product.asp?pn=3081628&bhcd2=1180419926
All you need are two solar cells arranged in a wedge as shown. Use
comparators to drive relays to run the motor in one direction
or the other.
You can build this out of op amps and relays, or use a microprocessor.
I'd be inclined to use op amps, because you can power the tracker off the
solar panel without worrying too much about what
happens during low power conditions. After all, when it's dark,
it doesn't matter where the collector is pointed. Allow for a dead
band, so when the outputs from both halves of the wedge are nearly
equal, the motor doesn't run.
The Art of Electronics by Horowitz and Hill covers op amps
and comparators quite well.
Read this manual for a commercial solar panel tracker:
http://www.wattsun.com/PDF/Wattsun_TR-55_Installation_Guide.pdf
John Nagle
.
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