Posted by JERD on December 16, 2007, 8:01 pm
I have a rotating roof vent that spins it's heart out day and night and it
strikes me this is energy going to waste!
Can someone please suggest a suitable DC permanent magnet motor, eg from
large tape deck, commercial surplus equipment etc. that I can connect to
this vent and get some free electricity?
Will just be part of the big picture and I don't like seeing energy going to
waste.
Even if I get 100 mA out of it, as a hobbyist it is worth doing.
JERD
Posted by CJT on December 16, 2007, 9:46 pm
JERD wrote:
> I have a rotating roof vent that spins it's heart out day and night and it
> strikes me this is energy going to waste!
>
> Can someone please suggest a suitable DC permanent magnet motor, eg from
> large tape deck, commercial surplus equipment etc. that I can connect to
> this vent and get some free electricity?
>
> Will just be part of the big picture and I don't like seeing energy going to
> waste.
>
> Even if I get 100 mA out of it, as a hobbyist it is worth doing.
>
> JERD
>
>
Your best bet might be an old bicycle headlight generator.
--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.
Posted by bealiba on December 16, 2007, 9:52 pm
> JERD wrote:
> > I have a rotating roof vent that spins it's heart out day and night and it
> > strikes me this is energy going to waste!
> > Can someone please suggest a suitable DC permanent magnet motor, eg from
> > large tape deck, commercial surplus equipment etc. that I can connect to
> > this vent and get some free electricity?
> > Will just be part of the big picture and I don't like seeing energy going to
> > waste.
> > Even if I get 100 mA out of it, as a hobbyist it is worth doing.
> > JERD
> Your best bet might be an old bicycle headlight generator.
> --
> The e-mail address in our reply-to line is reversed in an attempt to
> minimize spam. Our true address is of the form che...@prodigy.net.
Yep, that would stop it from turning and making noise.
Posted by BobG on December 16, 2007, 10:17 pm
Stepper motors make pretty good generators. Each coil will drive a fw
rectifier. Rects feed a cap. I wanted to rig one of these up on my
Harbor Freight windmill. Might be able to run some decorative leds or
something.
Posted by BobG on December 16, 2007, 10:34 pm
You could count the half wave cycles from the stepper and rectifiers
using a microcontroller. Make an anemometer. I assume a roof turbine
spins at 1/3rd the windspeed like a cup anemometer?
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> strikes me this is energy going to waste!
>
> Can someone please suggest a suitable DC permanent magnet motor, eg from
> large tape deck, commercial surplus equipment etc. that I can connect to
> this vent and get some free electricity?
>
> Will just be part of the big picture and I don't like seeing energy going to
> waste.
>
> Even if I get 100 mA out of it, as a hobbyist it is worth doing.
>
> JERD
>
>