In rec.aviation.piloting Larry Dighera wrote:



Today, brushless DC motors, or even three-phase induction motors, are
used.

Sonex mentions a brushless DC motor:

http://www.greencarcongress.com/2007...aft-.html#more
Using a purpose-built AeroConversions brushless DC
cobalt motor, controller, and highly efficient battery ...

... the design team, in collaboration with Bob Boucher of Astro
Flight, Inc. (http://www.astroflight.com/), has designed and built
a completely new AeroConversions motor.

This motor is the most powerful, lightest-weight, and efficient
unit of this type ever produced. It is a 3 phase, 270 volt, 200
amp motor that will be over 90 percent efficient.


This works out to about 75 continuous HP by my calculations.

It will be interesting to see what the future brings.

I'm not totally convinced the internal controllers electronics for
a brushless DC motor are going to be that reliable at these power
and heat levels.

Time will tell.

The Civic hybrid uses a brushless DC motor, so there's a test bed
for that level of power.

--
Jim Pennino

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