I have been talking to a gentleman that spoke to John Coe at the U.S department of energy. (this is all he said she said) but he told me that the most efficient motor that is used today can only get 31-33 % efficiency, and that is at near absolute zero. Please help me understand this, if it is true, and what it means.

Yes, I have brushless motors in my electric RC airplanes that are up to 90% efficient at converting the battery power into mechanical power.

33% efficient, that´s really bad efficiency especially at zero kelvin lol .

You can buy motors nowadays that have 90% efficiency and they don´t need special cooling or anything. And you can make low torque motors like pulse motors with even higher efficiencies.
link:
http://www.thingap.com/news/pdf/tg2340pr050508sw.pdf

yea, I thought the numbers did not make any sense. standard generators produce almost 90% too based on hp to watts output. the 30% must be something else, lost in translation.
Cameron

I have been talking to a gentleman that spoke to John Coe at the U.S department of energy. (this is all he said she said) but he told me that the most efficient motor that is used today can only get 31-33 % efficiency, and that is at near absolute zero. Please help me understand this, if it is true, and what it means.

Hi,
I do believe, that he has ment common 4-stroke combustion engines.
But my rough calculation ist less than 31%.
Only 1 Stroke is converting the stored energy in gasoline to work.
Means 1 1/2  revolutions of the crancshaft of
the energy stored by the flywheel
is taken, just to make te motor spin 2 revolutions (for 4 strokes).
That makes 25% efficency. (Roughly calculated, not every stroke takes the same energy off the flywheel)

And a lot of the fossil energy is going into production of wasted heat and friction,
which deducts from the efficency calculation as well.
No matter how perfect you burn the gas in a 4-stroke Otto-motor,
with sophisticated injection-systems and turbos.
Its horrible principle stays since rockefeller took control.
Even a steam.engine is more efficient.

2-stroke and diesels are a bit better, but not more than 35%.

You always drain at least 65% of your fuel to the toilet.
...Same with HHO in regular cars BTW.

Maybe somebody understands what i mean and can explain that better,
since english is not my native tongue.

best,
sushi

I hear that this little dynamo is pretty darned efficient:


http://www.youtube.com/watch?v=EhRwe7ucfFs

http://www.youtube.com/watch?v=hoa-KmVu-Kg


God bless,


TS

This lady was refering to gasoline combustion motors. As mentioned in a post earlier.
He should have asked her about the best High End electrical motors but I don't think "she" cares about this knowledge.
It's not her profession to know all technological details on the lastest developments unless being fanatic in these matters.

Here is a 98% efficient halbach array & ironless axial flux solar car motor.
http://www.csiro.au/resources/pf11g.html
http://www.csiro.au/files/CSIROau/Software/SolarCar.zip

Please see the zipped attachment on close motor development and details.

Hi Honk,

thanks a lot for the info.

Maybe offtopic,
but do you (or anybody else here) have experiences with EV Conversion kits available?
I know, that there are a lot of claims and proposals,
but i am interested in verified conclusions by users.
In germany, the conversion-market is widely open,
but there are no reliable suppliers. .. As far as of today.
The same is valid for available EV cars with "normal" prices.
Every German Motor-Company are still selling horrible combustion BS.
For good reason to them, but not for humanity.

@fritznien
I know very well, they are optimized.
And if you emulgate the Diesel with water, you are getting up to 75% efficency.
And if you use bigger flywheels and "Hit'nMiss"-technologies, there are further improvements possible.
Plus, if combined with wind power (sailing), marine transportation can be up to 95% efficient.
But i do live in a town with some cars. And i dont want to burn fossil resources anymore.
At least, a good Electric or Airpressure-driven car would be the right next step.

best,
sushi

the 30% + or - makes sense for combustion. than, what is the most efficient electric motor, not a wheel or a device that is not truly prooven, one that is marketed, is it around 90 % or so??
cam

after doing some thought, I now know why it was a combustion motor that they were refering to. Somewhere in the line, a combustion motor is needed to create the electricity, something must be used to turn the generator.
What about a turbine, how about those, like a what a nuclear plant would use. this is simply a steam turbine motor, how efficient does that convert the heat into rotation.
Cam

Almost everything else is more efficient than all of these ancient machines including nuclear plants.
At least, a turbine is a bit better than most piston driven "power converters".

Compared to all of that, a solar panel is already "Overunity",
because it generates power from "nothing".
And maybe soon, the "vacuum" can be explained as easy as the sun.

There are Electric-motors existent with an efficiency of above 90%,
but they are hardly to find and even harder to buy for common use.

sadly
sushi