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HomeAircraftHelicopterHelicopter Main Discussion › Capacitors to replace batteries?
11-13-2014 05:55 PM  3 years agoPost 1
sharam

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Northern California - Fly at Morgan Hill Field

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This sounds pretty awesome - hope it becomes reality!

http://www.iflscience.com/technolog...-within-5-years

Verba volant, scripta manet

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11-14-2014 09:31 PM  3 years agoPost 2
Flyin for Jesus

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Troy, IL. 62294

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Caps charge quickly and discharge quickly... But do not have the same energy density of our common LiPos. Its mentioned that further down. That is the limiting factor of capacitors.
Once they can get as much power in a 1lb capacitor as they can in a 1lb battery, it's game over. Capacitor power, here we go.

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11-14-2014 09:37 PM  3 years agoPost 3
ticedoff8

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Morgan Hill, CA. USA

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Once a capacitor gets to a similar power density as a LiPo, then there will be several "games over".

I would suggest that this would be the Holy Grail of energy storage.
Or, maybe "Cold Fusion" is the Holy Grail.

But, in 5 years? No way.

The first big application would be the power grid - storing solar and wind energy for later use.

Then transportation. No need for Hybrid cars when I can charge up a cap and run 100 miles

In 5 years? Again, no way.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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11-14-2014 11:45 PM  3 years agoPost 4
rexxigpilot

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Florida

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"Vehicles need an extra energy spurt for acceleration, and this is where supercapacitors come in. They hold a limited amount of charge, but they are able to deliver it very quickly, making them the perfect complement to mass-storage batteries," Marco Notarianni of QUT said in a press release. Notarianni was lead author of the Nanotechnology paper. "Supercapacitors offer a high power output in a short time, meaning a faster acceleration rate of the car and a charging time of just a few minutes, compared to several hours for a standard electric car battery.”
That's the truth in the article. The other stuff about in the future making it with more capacity than a lithium-ion battery is simply BS or wishful thinking. Its best use is in conjunction with long-life battery technology that perhaps doesn't have a high discharge rate. The super-capacitor would handle the high discharge function.

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11-15-2014 12:24 AM  3 years agoPost 5
icanfly

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ontario

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you know there's a lot of electric ac motors with a cap to help boost the start up

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11-15-2014 12:28 AM  3 years agoPost 6
Retired2011

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Lee's Summit, MO

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I also see it as an assist to a battery storage system, not a replacement.

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11-15-2014 01:25 AM  3 years agoPost 7
EEngineer

rrProfessor

TX

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you know there's a lot of electric ac motors with a cap to help boost the start up
But the purpose of such caps different from that of replacing a battery with a cap.

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11-15-2014 01:40 AM  3 years agoPost 8
EEngineer

rrProfessor

TX

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DC motors with mechanical commutation also have caps.

The is to suppress the wide band RF noise generated when the commutators "make" and "break" the circuit.

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11-15-2014 02:16 AM  3 years agoPost 9
dkshema

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Cedar Rapids, IA

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you know there's a lot of electric ac motors with a cap to help boost the start up
Those capacitors are NOT charged at start up. They do NOT supply voltage or current to "start" the motor, they provide a phase lag between voltage and current in a start winding to make the single phase AC induction motor start turning on its own. After the motor reaches about 75% of its rated RPM, the start capacitor is disconnected.

These same motors may also have a "run" capacitor, but again, it doesn't supply voltage to make the motor run, it allows the motor to run smoothly at its rated RPM.

-----

There have been many "breakthrough" battery technologies touted over the years. I wouldn't hold my breath on this one, either.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-15-2014 04:09 AM  3 years agoPost 10
EEngineer

rrProfessor

TX

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Well explained, dk...

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11-15-2014 11:58 AM  3 years agoPost 11
Retired2011

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Lee's Summit, MO

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OK, would one of you smart guys explain the function of the capacitors on an ESC?

EDIT:
I did a little research and found the following thread (among other info).
http://www.rcgroups.com/forums/showthread.php?t=975333

I'm sure Dave would have told me about the virtues of the Google search engine...so I decided not to be so lazy.

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11-16-2014 01:51 AM  3 years agoPost 12
EEngineer

rrProfessor

TX

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the function of the capacitors on an ESC?
I assume you mean the big electrolytic on the battery side of the ESC?

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11-16-2014 02:06 AM  3 years agoPost 13
EEngineer

rrProfessor

TX

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The ESC's pulse width modulator(PWM) is switching the voltage/current to the motor's coils to perform the electrical motor commutation.

When the commutation phasing changes, there are momentary voltage spikes on the input side, caused by current demand fluctuations.

These cause voltage spikes on the insput side of the ESC.

The caps are used to snub these spikes to the extent possible.

One can even add more caps....I believe CC has "cap banks" for this purpose.

In most cases, the ESC engineers have provided the proper sizing, so the stock configuration will work.

Watch at YouTube

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11-16-2014 02:21 AM  3 years agoPost 14
EEngineer

rrProfessor

TX

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Here's a Mr Mel link that has a couple of videos demonstrating how to kill your ESC in two different ways.....

http://heli.dacsa.net/MrMelSite/index.html

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11-17-2014 01:31 AM  3 years agoPost 15
Wingman77

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Pulaski Tennessee

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Here is what I did

Watch at YouTube

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11-18-2014 01:20 AM  3 years agoPost 16
EEngineer

rrProfessor

TX

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Does your cycle have a magneto or alternator on it?

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11-24-2014 02:08 AM  3 years agoPost 17
Wingman77

rrProfessor

Pulaski Tennessee

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mag i believe.

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