Wes Eargle wrote:
MikeWhitney wrote:
wikipedia.org wrote:
Brushless motors are typically 85-90% efficient whereas DC motors with brushgear are typically 75-80% efficient.
Are they not talking about Power In/Power Out = Efficiency? I get that combustion engines are limited to something like 59% (Carnot Cycle?) efficiency but I didn't think any such limit applied to electric motors.
I think that your frame of reference is too small. Where did the e- come from? Don't make the same mistake that the Prius drivers that apply the smug bumper stickers make -- their carbon impact is as equally high or higher than a "normal" car.
If you go back and re-read this thread all you will see is that I'm asking you why you claim that George's statement that an electric motor can not be more than 70% efficient. I thought you knew something that I did not.
So in the usual terms of Eout/Ein, electric motors can be and are 90% efficient on a regular basis.
Now, if you want to move onto another topic of point-source pollution / energy conservation / etc, I'd be happy to do it. (Edit to add - I'm talking about the Law of Conservation of Energy of course)
How large is your frame of reference? You know that ALL energy to be found on this planet once came from the sun, no? How efficient was the plants in prehistoric times at photosynthesis?
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Mike Whitney
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