12 volts??

A place to discuss all things involving power and lighting. Generator tips, alternative energy, lighting your camp/bike/art/self and more.

12 volts??

Postby unjonharley » Tue Jul 20, 2010 5:38 pm

I have a razor scooter motor.. I can get 5v DC when I spin it with a drill motor..

Will the volts go up with more speed??
User avatar
Posts: 10124
Joined: Tue Sep 09, 2003 11:05 am
Location: Salem Or.
Burning Since: 2001
Camp Name: Elliot's naked bycycel repair

Postby oneeyeddick » Tue Jul 20, 2010 5:44 pm

hook it up to your side grinder and find out
We have an obligation to make space for everyone, we have no obligation to make that space pleasant.
User avatar
Posts: 5590
Joined: Wed Oct 24, 2007 6:08 pm
Location: Probably in your pants
Burning Since: 1996

Postby Token » Tue Jul 20, 2010 5:45 pm

Try a Dremel. See what happens. Best stick a light bulb or some kind of load on it then measure.
User avatar
Posts: 2722
Joined: Tue Sep 02, 2003 2:55 pm
Location: Gold Country, CA
Burning Since: 2001

Postby mudpuppy000 » Tue Jul 20, 2010 6:07 pm

Or set the drill at 1/2 speed and see if the voltage drops. :)
User avatar
Posts: 1410
Joined: Fri Sep 25, 2009 3:54 pm
Location: Los Angeles, CA
Burning Since: 2009
Camp Name: Orphan Endorphin

Re: 12 volts??

Postby Zhust » Tue Jul 20, 2010 7:39 pm

unjonharley wrote:Will the volts go up with more speed??

Yes, but you probably don't want to go much faster than 25% over the maximum speed the motor was designed to run at. I'd wager that if it's a 12-volt motor, you'll probably get 12 volts as a generator until you're in the 3x range above the original maximum RPM.

Some "universal AC/DC" motors work as generators. Some electric lawnmowers I've seen use a 150V DC motor with a bridge rectifier (the Black-and-Decker ones that short out the motor to stall it when you let go of the trigger), and they work as generators. I also found a junked 120VAC electric string trimmer and when I ran the motor on my drill press, I could get it to produce usable power above 12 volts -- enough that it seemed plausible to use that as a generator. In general, if a motor "cogs" (snaps to angular positions) it has magnets which makes it a candidate for a generator.
May your deeds return to you tenfold,
---Zhust, Curiosityist
User avatar
Posts: 710
Joined: Tue Feb 15, 2005 1:46 pm
Location: Rochester, NY
Burning Since: 2004
Camp Name: Camp CampCampCamp

Postby Bluemandrew » Wed Jul 21, 2010 5:57 am

A Burner from Boston is working on a really impressive project this year called lowRes http://lowres.info/

He's using brushless bike hub motors as generators, as they're built for a lower rpm

This weekend I’ll set it up so I can actually sit and pedal, but I was able to get 100 watts (~13 volts @ 9 amps) without too much effort pedaling with my arms.

Seems promising.
Posts: 230
Joined: Sun Aug 31, 2008 10:55 pm

Return to Power & Illumination

Who is online

Users browsing this forum: No registered users and 1 guest