[Lab] human powered art

Darcy Whyte darcy at siteware.com
Mon Jan 17 12:20:02 EST 2011

Hi Richard,

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.

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.

Plus if I ever get the urge to make a motorized scooter I'd have the motor
on hand.

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).

Not only that you get DC out of the go-kart motors which might be more

 I was at Princes Auto yesterday and they didn't have anything like it
floating around.

So I will start a prototype using one of those motors.

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.

-user pushes a wheel around
-user rows
-user pedals
-user wears a harness and pulls cable off a spool to create rotary motion
-user wears a harness and does squats to pull row spool. (two people could
do a teeter totter action like that
-user hand cranks
-user pulls a rope like a tug-a-war

Obviously to get the big power we're going to need the legs in on this.

On Sun, Jan 16, 2011 at 8:38 PM, Richard Guy Briggs <rgb at tricolour.net>wrote:

> On Sat, Jan 15, 2011 at 06:12:24PM -0500, Richard Guy Briggs wrote:
> > On Fri, Jan 14, 2011 at 07:14:29AM -0500, Darcy Whyte wrote:
> > > I would like to make a human powered generator for an art project.
> > > I am curious if a couple of NEMA 34 motors is large enough to capture
> all
> > > the power that a human can generate.
> > Do you have a link for your NEMA 34 motor specs?  I've seen anywhere
> > from 50W up to 500, so it sounds like those might work!
> > > I'm suspecting that a stepper motor is a good candidate to make the
> > > electricity. I think the first part of the project is to make up some
> BOMs
> > > that show what motor to use, the RPM that it would require and parts
> for a
> > > rectifier and whatever else is necessary to operate in these
> applications.
> >
> > I've got lots of small ones, so I can try some tests and see.  I
> > wouldn't have thought they would work because the rotor I thought was
> > unmagnetized steel.
> I now understand that NEMA 34 is a mounting plate standard.
> So, looking through my box, I have one NEMA 34 motor and four NEMA 23,
> plus about eight NEMA 17 or smaller as well as a bunch of other smaller
> assorted steppers.
> The NEMA 34 is a Matsushita 1HHS-486CS, 6V, 2.2ohm, 1.8 deg/step 6-wire
> unipolar.  I can't find any info about it on the net.  My guess is it
> its max rating is around 36W, maybe double that depending on how they
> rate them.
> Hooking up a bridge rectifier across each coil, using a cordless drill,
> I was able to get .5A short circuit and beyond 12v out of it open
> circuit.  Using various loads, I think I was able to get as much as 12W
> out of it.  It wasn't exhaustive, but I think that was somewhere near
> the peak.  I may have been able to get more with a higher speed.
> One of the NEMA 23 motors is a Matsushita 1HHS-457CH 24V, 26ohm,
> 1.8deg/step 6-wire unipolar.  Didn't find anything on it either.  Again
> my guess is 48 or maybe 96W.
> Short: 0.16A, Open: 170V  Most I was able to get was about 8 Watts out
> of it.
> These motors look pretty underpowered compared with some of the specs
> I've seen on the net...  This isn't surprising since I think these are
> 20 years old.
> Darcy, do you have any part numbers or specs for your steppers?
> >       slainte mhath, RGB
>        slainte mhath, RGB
> --
> Richard Guy Briggs               --  ~\    -- ~\            <
> hpv.tricolour.net>
> <www.TriColour.net>                --  \___   o \@       @       Ride yer
> bike!
> Ottawa, ON, CANADA                  --  Lo_>__M__\\/\%__\\/\%
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