Charging 12V Battery while riding Bicycle

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cato
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Re: Charging 12V Battery while riding Bicycle

Post by cato » Sat Jan 22, 2005 3:20 am

Thanks again for your input.<p>For info on how it was eventually worked out, see page 57 February 2005 QST (well, page 58, Fig.4 actually).<p>
...and my brother would appreciate your vote :cool: : <p>http://www.arrl.org/members-only/qstvote.html?pidx=0<p>
73<p>[ January 22, 2005: Message edited by: cato ]<p>[ January 22, 2005: Message edited by: cato ]</p>

upsmaster
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Re: Charging 12V Battery while riding Bicycle

Post by upsmaster » Sat Jan 22, 2005 4:26 am

parallel two 6 volt batterys for charging then series them for 12 volts discharging<p> joe

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Chris Smith
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Re: Charging 12V Battery while riding Bicycle

Post by Chris Smith » Sun Jan 23, 2005 11:05 am

One tiny stepper motor put out around 30 plus volts, problem solved for any voltage.

Dean Huster
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Re: Charging 12V Battery while riding Bicycle

Post by Dean Huster » Mon Jan 24, 2005 4:34 pm

Chris, the only experimentation with steppers that I've done is to electrically interconnect two healthy identical ones together to let one drive the other like an old synchro-servo system (and that was just for amusement) and to use one as a quadrature generator replacing a rotary encoder (more serious work). It would make sense that if one can drive another, they must be able to output a healthy current. But when just playing with them as possible input devices, I noticed that a big one can output a waveform in the hundreds of volts p-p but are quickly quenched with a load.<p>So, since I haven't played with them as power generators and don't have one handy at the moment to experiment with, what kind of current/power is a hefty stepper capable of?<p>Dean
Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).

R.I.P.

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Chris Smith
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Re: Charging 12V Battery while riding Bicycle

Post by Chris Smith » Mon Jan 24, 2005 4:52 pm

Dean a few months back in NV there was a simple article showing the stepper motor used as a generator, into a super cap, for a hand crank type flash light. <p>The four diode bridges into a cap give it the load and like a alternator and battery, it becomes [semi] self regulating. <p>For a small battery, Even though the voltage can peak quite high, the current and voltage "follow" the batteries command of X ohms internal resistance = a normal trickle charge. <p>5-1/4 Large floppy drives which are now almost obsolete have great little stepper motors making finding one pretty easy.

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