Ultracap's in eV's

How do you store and manage your electricity?
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Richo
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Ultracap's in eV's

Post by Richo » Mon, 09 Mar 2009, 01:04

For direct drive the Tacho is pretty useless.
So his torquometer is very useful. Image
As the controller is only putting out a pulse signal I guess there is no difference if the CPU puts out RPM, Torque or Power etc...

Do you know if he will be trade marking the term "Torqometer" ? Image
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acmotor
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Ultracap's in eV's

Post by acmotor » Mon, 09 Mar 2009, 01:31

You could say it is a CVT transmission and the torque meter is actually the RPM ? Image

There you go Mal... Torqometer (tm)
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Richo
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Ultracap's in eV's

Post by Richo » Mon, 09 Mar 2009, 01:47

The 310F caps:
weigh 60g ea. So 100 would be 6kg.
Are PCB mount.
33mm Dia x 62mm L

The 650F caps:
weigh 200g ea. So 92 cells would be 18.4kg
Have screw terminals at each end (like Lifebatts)
61mm Dia x 52mm L

Depending on how much regen is reclaimed the next size down could even work.
They are 120F ea and weigh 29g ea (so 2.9kg for a pack)
Don't know price but since ordering 100 would expect to be under $2k.

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acmotor
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Ultracap's in eV's

Post by acmotor » Mon, 09 Mar 2009, 03:50

How do they arrange voltage management in these series caps ?
This ultra cap add on might be worth trying.
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Richo
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Ultracap's in eV's

Post by Richo » Mon, 09 Mar 2009, 04:05

125V zenner or 100 x 2.5V zenner Image

Ah I've seen some with a resistor in parallel across each cell.
And just monitor the voltage level.
Problem is if one is dead then each may get proportionally more and eventually damage the rest.
Unlikely though.
Considering we have been contemplating 220 cell BMS I think a 100cell monitor should be a breeze.
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Ultracap's in eV's

Post by antiscab » Mon, 09 Mar 2009, 06:04

acmotor wrote: Hey Richo, did you like Mal's torqometer ??
Neat, I want what one in the Rodeo !

Matt, maybe metric mind ?
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acmotor
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Ultracap's in eV's

Post by acmotor » Mon, 09 Mar 2009, 06:28

Still running DC motors though ! Image
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Ultracap's in eV's

Post by Andrew » Mon, 09 Mar 2009, 06:31

acmotor wrote: Still running DC motors though ! Image


Image
...and lead acid batteries
Image
(back on topic)

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Ultracap's in eV's

Post by Geerant » Fri, 26 Jun 2009, 17:45

A little while ago i found this exact theory put into action using a buck/boost converter.

ImageImage

And a few links

http://www2.ing.puc.cl/power/research/traction.htm
http://www2.ing.puc.cl/power/publicatio ... lation.htm
http://www2.ing.puc.cl/power/paperspdf/ ... rtuzar.pdf
http://www2.ing.puc.cl/power/publicatio ... ations.htm

Stay tuned for the Magnatron, when i get back from work in November ill post the build.
Working on the "Magnatron".

[url=mailto:geerant101@hotmail.com]Email[/url] me for more details.

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Geerant
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Ultracap's in eV's

Post by Geerant » Fri, 26 Jun 2009, 17:48

Ok wow that pic came out way too big

Image

There we go
Working on the "Magnatron".

[url=mailto:geerant101@hotmail.com]Email[/url] me for more details.

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Ultracap's in eV's

Post by antiscab » Sat, 27 Jun 2009, 00:50

Welcome to the forum Geerant.

You should post up a build thread re ur magna conversion.

still not sold on the supercap idea.

supercaps (even when behind a boost/buck converter) have poor power density (and horrific energy density).

To be meaningful, the boost/buck converter have to be rated close to that of the motor controller. The resulting power silicon, (ripple) caps and inductor are non-trivial.

Parrallel A123 cells give much more bang for your $ (at least on paper, results soon)

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Ultracap's in eV's

Post by zeva » Sat, 27 Jun 2009, 01:38

antiscab wrote: still not sold on the supercap idea.

supercaps (even when behind a boost/buck converter) have poor power density (and horrific energy density).

To be meaningful, the boost/buck converter have to be rated close to that of the motor controller. The resulting power silicon, (ripple) caps and inductor are non-trivial.

Parrallel A123 cells give much more bang for your $ (at least on paper, results soon)

Yeah I'm in two minds about supercaps.. To be particularly useful, I agree the converter managing them must be rated close to the motor controller in terms of power, and there must be enough capacitance to absorb all braking energy from at least 60km/h (or better, 120km/h).

However I can see a day when mechanical brakes will be almost redundant due to regen braking, which means the vehicle needs to be able to put the regen energy somewhere very quickly when braking hard. Right now batteries really don't like fast charging, and their cycle life may be an issue. Ultracaps have fantastic cycle life and potential charge rates.

That said hopefully battery technology will improve. It's much more elegant to have a single thing (batteries) holding all your energy instead of two (batteries + capacitors). The AltairNano cells might be a taste of things to come in the battery world - they can charge at ridiculous rates and have high enough cycle life (~20000) that cycling due to regen shouldn't be a concern.
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