<div><div>Hi Richard,</div></div><div><br></div><div>Yeah, NEMA is just a mounting plate so I was really considering if that size was big enough and also if a stepper was the right choice.</div><div><br></div><div>What it looks like though is that those go-kart motors are attractive. Also the home made generators (parts from volvo and such) look good but I think the go-kart is a little more accessible to me at the moment so I will probably look at that. </div>
<div><br></div><div>Plus if I ever get the urge to make a motorized scooter I'd have the motor on hand. </div><div><br></div><div>I'm pretty sure the steppers are too small (and the go-kart industry is price friendly as it's also a scaled up industry).</div>
<div><br></div><div>Not only that you get DC out of the go-kart motors which might be more handy. </div><div><br></div><div> I was at Princes Auto yesterday and they didn't have anything like it floating around. </div>
<div><br></div><div>So I will start a prototype using one of those motors.</div><div><br></div><div>I guess once I get one or two of those motors I can start to look at different ways to drive it with human power. </div>
<div>
<br></div><div>-user pushes a wheel around</div><div>-user rows</div><div>-user pedals</div><div>-user wears a harness and pulls cable off a spool to create rotary motion</div><div>-user wears a harness and does squats to pull row spool. (two people could do a teeter totter action like that</div>
<div>-user hand cranks</div><div>-user pulls a rope like a tug-a-war</div><div><br></div><div><br></div><div>Obviously to get the big power we're going to need the legs in on this. </div>
<br><br><div class="gmail_quote">On Sun, Jan 16, 2011 at 8:38 PM, Richard Guy Briggs <span dir="ltr"><<a href="mailto:rgb@tricolour.net">rgb@tricolour.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">On Sat, Jan 15, 2011 at 06:12:24PM -0500, Richard Guy Briggs wrote:<br>
> On Fri, Jan 14, 2011 at 07:14:29AM -0500, Darcy Whyte wrote:<br>
> > I would like to make a human powered generator for an art project.<br>
<br>
</div><div class="im">> > I am curious if a couple of NEMA 34 motors is large enough to capture all<br>
> > the power that a human can generate.<br>
<br>
</div><div class="im">> Do you have a link for your NEMA 34 motor specs? I've seen anywhere<br>
> from 50W up to 500, so it sounds like those might work!<br>
<br>
</div><div class="im">> > I'm suspecting that a stepper motor is a good candidate to make the<br>
> > electricity. I think the first part of the project is to make up some BOMs<br>
> > that show what motor to use, the RPM that it would require and parts for a<br>
> > rectifier and whatever else is necessary to operate in these applications.<br>
><br>
> I've got lots of small ones, so I can try some tests and see. I<br>
> wouldn't have thought they would work because the rotor I thought was<br>
> unmagnetized steel.<br>
<br>
</div>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>
> slainte mhath, RGB<br>
<div><div></div><div class="h5"><br>
slainte mhath, RGB<br>
<br>
--<br>
Richard Guy Briggs -- ~\ -- ~\ <<a href="http://hpv.tricolour.net" target="_blank">hpv.tricolour.net</a>><br>
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</div></div></blockquote></div><br>