That is small.
Now if we just had a battery.
http://phys.org/news/2015-04-world-record-electric-motor-aircraft.html
Now if we just had a battery.
http://phys.org/news/2015-04-world-record-electric-motor-aircraft.html
I have spoken with Ed Dempsey of 400Hz engineering about building us an uncommonly tiny 200HP high frequency/high pole-count/low speed(<2000RPM)/high torque motor. He said that when increasing poles there comes a point where you start losing too much power. He said that above 10 poles, if the point is to cram the most power into the smallest space, it no longer makes any sense to continue increasing poles. Going that direction leads to a larger, heavier, more inefficient motor; better results can be achieved with a lower pole higher speed motor with a reducer gearbox (and fit in a smaller space, including the gearbox).so they are going to higher frequency ac motors? not a very new idea. we have motors here that put out 35 hp you can carry in one hand. just more poles and higher frequency.
Not sure who you are addressing there; if it's me, I wasn't implying that you need more poles for higher RPM. I was talking about increasing frequency to reduce motor size, and in order to increase frequency while keeping RPM in a directly-usable (not requiring a reducing gearbox) range (<250oRPM per the atricle ) would require additional pole pairs.or a low pole count motor. a two p0ole 60 hz motor is rated at 3600 rpm (minus slip) and a 4 pole motor on 60 hz is rated 1800 rwpm (minus slip) why would you need more poles for higher rpm? using a good ferite mix for the poles would allow much higher frequency drive and rpm. the 35,000 rpm three phase spindle motor rated at 35 hp isnt very heavy, but it does require lisquid cooling, being inside the spindle assy. they use a Grasby - volksmann vfd to drive it, as part of a Henri Line milling center.
These NASA guys get paid for this! I just decided: I want to work for NASA. I guess the first step would be to get my degree.There's a very interesting video at the end of this article showing a NASA prototype with a 10-engine electric plane.
by Duane Benson
by Jake Hertz