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Posted by Wayne Lundberg on August 6, 2006, 4:59 pm
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Apparently http://teslamotors.com/index.php?js_enabled=1 the Tesla Motors
people in Silicone Valley have discovered the ultimate in battery, electric
motor, recharging time and control. It will be interesting to see if any of
this technology filters down to us humble robotics people in quest of more
power, less weight and better control.
Just out of curiosity, what is the best speed up a 20% grade you have ever
seen in a robotic application and what was the weight to power ratio
including battery and motor? with or without supercapacitors? I'm looking
for some benchmarks from where to start our own robotics project.
Wayne
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Posted by Randy M. Dumse on August 6, 2006, 6:13 pm
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> including battery and motor? with or without supercapacitors?
What's your interest in supercaps, Wayne? I don't think they are very
useful in robotics or motor control, etc. The supercaps I've used are
fine for storing a big charge you take out slowly, like battery back up
on RAM memory when you loose main power. But so is a battery - only a
lot better in capacity and density, etc. So a supercap in a robot
application where there is already a battery is like a redundant piece
of equipment that will add weight, complexity, and not improve
performance. Have you heard something else about them I haven't?
--
Randy M. Dumse
www.newmicros.com
Caution: Objects in mirror are more confused than they appear.
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Posted by Wayne Lundberg on August 6, 2006, 8:17 pm
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> > including battery and motor? with or without supercapacitors?
>
> What's your interest in supercaps, Wayne? I don't think they are very
> useful in robotics or motor control, etc. The supercaps I've used are
> fine for storing a big charge you take out slowly, like battery back up
> on RAM memory when you loose main power. But so is a battery - only a
> lot better in capacity and density, etc. So a supercap in a robot
> application where there is already a battery is like a redundant piece
> of equipment that will add weight, complexity, and not improve
> performance. Have you heard something else about them I haven't?
>
> --
> Randy M. Dumse
> www.newmicros.com
> Caution: Objects in mirror are more confused than they appear.
>
As I understand it, a lot of power can be available in an instant from a
supercap and in a lighter weight 'containiner' for use when you need that
extra jolt of power like climbing over a hump and can be quickly recharged
from the onboard batteries for another jolt when needed. Am I wrong?
Wayne
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Posted by J.A. Legris on August 6, 2006, 9:15 pm
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Wayne Lundberg wrote:
> > > including battery and motor? with or without supercapacitors?
> >
> > What's your interest in supercaps, Wayne? I don't think they are very
> > useful in robotics or motor control, etc. The supercaps I've used are
> > fine for storing a big charge you take out slowly, like battery back up
> > on RAM memory when you loose main power. But so is a battery - only a
> > lot better in capacity and density, etc. So a supercap in a robot
> > application where there is already a battery is like a redundant piece
> > of equipment that will add weight, complexity, and not improve
> > performance. Have you heard something else about them I haven't?
> >
> > --
> > Randy M. Dumse
> > www.newmicros.com
> > Caution: Objects in mirror are more confused than they appear.
> >
> As I understand it, a lot of power can be available in an instant from a
> supercap and in a lighter weight 'containiner' for use when you need that
> extra jolt of power like climbing over a hump and can be quickly recharged
> from the onboard batteries for another jolt when needed. Am I wrong?
>
> Wayne
You're right..
http://en.wikipedia.org/wiki/Image:Supercapacitors_chart.png
--
Joe Legris
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Posted by Randy M. Dumse on August 6, 2006, 10:29 pm
Please log in for more thread options right..
>
> http://en.wikipedia.org/wiki/Image:Supercapacitors_chart.png
>
> --
> Joe Legris
Huh. I went to the Maxwell sight, and that seems to be what they are
promoting for the BoostCaps or Ultracapacitor technologies.
When they first came out, I opened one of the small 1/2" ones, and what
outside looked like an electrolytic cap I found inside looked like two
stacked silver oxide coin cells. My conclusion at the time was they
weren't really much different than a rechargeable battery in nature.
But those had high ESR (Equivalent Series Resistance) and would slowly
take up a charge and slowly return it at close to a constant voltage,
seeming even more like a battery.
So I don't know much about these new Boost Caps, other than what I'm
reading now. Still seems like overhead in a robot to me. At least one
with any kind service period.
--
Randy M. Dumse
www.newmicros.com
Caution: Objects in mirror are more confused than they appear.
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