<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hey Richard,<div><br></div><div>Since you have a few steppers kicking around, something to try is wiring them up in parallel. If you turn one, the other may turn in-step.</div><div><br></div><div>Not sure what might happen if you wired three up in parallel, or maybe in a triangular arrangement with one phase wired to each neighbour. Get two people to crank steppers with/against each other, attach a fly-wheel to the third stepper and see what happens.</div><div><br></div><div>Andrew</div><div><br><div><div>On 2011-01-16, at 8:38 PM, Richard Guy Briggs wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>On Sat, Jan 15, 2011 at 06:12:24PM -0500, Richard Guy Briggs wrote:<br><blockquote type="cite">On Fri, Jan 14, 2011 at 07:14:29AM -0500, Darcy Whyte wrote:<br></blockquote><blockquote type="cite"><blockquote type="cite">I would like to make a human powered generator for an art project.<br></blockquote></blockquote><br><blockquote type="cite"><blockquote type="cite">I am curious if a couple of NEMA 34 motors is large enough to capture all<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">the power that a human can generate.<br></blockquote></blockquote><br><blockquote type="cite">Do you have a link for your NEMA 34 motor specs? I've seen anywhere<br></blockquote><blockquote type="cite">from 50W up to 500, so it sounds like those might work!<br></blockquote><br><blockquote type="cite"><blockquote type="cite">I'm suspecting that a stepper motor is a good candidate to make the<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">electricity. I think the first part of the project is to make up some BOMs<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">that show what motor to use, the RPM that it would require and parts for a<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">rectifier and whatever else is necessary to operate in these applications.<br></blockquote></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">I've got lots of small ones, so I can try some tests and see. I<br></blockquote><blockquote type="cite">wouldn't have thought they would work because the rotor I thought was<br></blockquote><blockquote type="cite">unmagnetized steel.<br></blockquote><br>I now understand that NEMA 34 is a mounting plate standard.<br><br>So, looking through my box, I have one NEMA 34 motor and four NEMA 23,<br>plus about eight NEMA 17 or smaller as well as a bunch of other smaller<br>assorted steppers.<br><br>The NEMA 34 is a Matsushita 1HHS-486CS, 6V, 2.2ohm, 1.8 deg/step 6-wire<br>unipolar. I can't find any info about it on the net. My guess is it<br>its max rating is around 36W, maybe double that depending on how they<br>rate them.<br><br>Hooking up a bridge rectifier across each coil, using a cordless drill,<br>I was able to get .5A short circuit and beyond 12v out of it open<br>circuit. Using various loads, I think I was able to get as much as 12W<br>out of it. It wasn't exhaustive, but I think that was somewhere near<br>the peak. I may have been able to get more with a higher speed.<br><br>One of the NEMA 23 motors is a Matsushita 1HHS-457CH 24V, 26ohm,<br>1.8deg/step 6-wire unipolar. Didn't find anything on it either. Again<br>my guess is 48 or maybe 96W.<br><br>Short: 0.16A, Open: 170V Most I was able to get was about 8 Watts out<br>of it.<br><br>These motors look pretty underpowered compared with some of the specs<br>I've seen on the net... This isn't surprising since I think these are<br>20 years old.<br><br>Darcy, do you have any part numbers or specs for your steppers?<br><br><br><blockquote type="cite"><span class="Apple-tab-span" style="white-space:pre"> </span>slainte mhath, RGB<br></blockquote><br><span class="Apple-tab-span" style="white-space:pre"> </span>slainte mhath, RGB<br><br>--<br>Richard Guy Briggs -- ~\ -- ~\ <<a href="http://hpv.tricolour.net">hpv.tricolour.net</a>><br><<a href="http://www.TriColour.net">www.TriColour.net</a>> -- \___ o \@ @ Ride yer bike!<br>Ottawa, ON, CANADA -- Lo_>__M__\\/\%__\\/\%<br>Vote! -- <<a href="http://greenparty.ca">greenparty.ca</a>>_____GTVS6#790__(*)__(*)________(*)(*)_________________<br><br>_______________________________________________<br>Lab mailing list<br><a href="mailto:Lab@artengine.ca">Lab@artengine.ca</a><br>http://artengine.ca/mailman/listinfo/lab<br></div></blockquote></div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div>--<br><br>Makerbot Number Nine... #9... 0x09... 0o11... 0b1001... <br><a href="http://clothbot.com/wiki/MakerBotNumberNine">http://clothbot.com/wiki/MakerBotNumberNine</a><br></div><div><br></div></span><br class="Apple-interchange-newline">
</div>
<br></div></body></html>