A DC motor is generally a permanent magnet type, so when the shaft turns it will generate electricity. Pull the blower motor out of an automotive style heater, and mount it in the box fan, and you should be able to generate power.
You -may- be able to rig a small battery to excite the field, or epoxy a couple small magnets to 'kick start' the system. That's a method used in some cases to convert battery ignition systems on motorcycles that have alternators to a batteryless system.
Ken.
> To: electricboats@yahoogroups.com
> From: drmark.draper@gmail.com
> Date: Mon, 22 Jun 2009 15:40:06 +0000
> Subject: [Electric Boats] dumb question about a fan
>
> We took a 110V window fan up to our boat to ventilate out diesel fumes. While it was sitting on the dock, I noticed it really spinning at a good rate because of a nice breeze.
>
> So, I am assuming this motor was generating some amount of electricity. What would it take to capture that? Something more complicated than a diode?
>
> md
>
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>
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>
> Yahoo! Groups Links
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