What is the Most Efficient Motor?

[cameron sydenham]

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.

[Yucca]

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.

Maximum motor efficiency is 90% and
peak system efficiency using a trapezoidal controller is 85%.

link:
http://www.thingap.com/news/pdf/tg2340pr050508sw.pdf

[hazens1]

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

[Bulbz]

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

I know a few people that use those in their model planes. I'm still a "die-hard" glow engine user myself though 

[cameron sydenham]

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