Electric Power and the Tesla car
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Subject Author Date
Electric Power and the Tesla car Wayne Lundberg 08-06-2006
Posted by J.A. Legris on August 7, 2006, 9:26 am
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Randy M. Dumse wrote:
> 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.

See the articles too:

http://en.wikipedia.org/wiki/Supercapacitors

http://world.honda.com/FuelCell/FCX/ultracapacitor/

--
Joe Legris


Posted by Wayne Lundberg on August 7, 2006, 12:24 pm
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>
> Randy M. Dumse wrote:
> > 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.
>
> See the articles too:
>
> http://en.wikipedia.org/wiki/Supercapacitors
>
> http://world.honda.com/FuelCell/FCX/ultracapacitor/
>
> --
> Joe Legris

In my mind's eye I see the supercaps as that extra boost when you need to
get out of a hole. Especially if the motor will accept the extra boost such
as a well balanced servo with a good PID controller.

Wayne

>



Posted by Padu on August 7, 2006, 4:12 pm
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"Wayne Lundberg"
> In my mind's eye I see the supercaps as that extra boost when you need to
> get out of a hole. Especially if the motor will accept the extra boost
> such
> as a well balanced servo with a good PID controller.
>
> Wayne
>


Of course it will depend on the type of motor and traction system you use,
but if we thing about R/C cars, the batteries have a very high discharge
rate, and the wheels will start spinning much sooner than any current limit
(for both battery and/or motor) are reached.

I was reading about supercaps and they are very nice, but if you are
thinking about R/C sized robots, it's really hard to get convinced of its
utility, since the power to fill the caps will come from the battery pack
anyway.

Cheers

Padu



Posted by Wayne Lundberg on August 7, 2006, 6:32 pm
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>
> "Wayne Lundberg"
> > In my mind's eye I see the supercaps as that extra boost when you need
to
> > get out of a hole. Especially if the motor will accept the extra boost
> > such
> > as a well balanced servo with a good PID controller.
> >
> > Wayne
> >
>
>
> Of course it will depend on the type of motor and traction system you use,
> but if we thing about R/C cars, the batteries have a very high discharge
> rate, and the wheels will start spinning much sooner than any current
limit
> (for both battery and/or motor) are reached.
>
> I was reading about supercaps and they are very nice, but if you are
> thinking about R/C sized robots, it's really hard to get convinced of its
> utility, since the power to fill the caps will come from the battery pack
> anyway.
>
> Cheers
>
> Padu
>
Must look into this because Maxwell seem to be promising a lot. But I have
yet to see the proof I have been asking for anyway from them.

Wayne



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