Siemens' 110 lb world-record electric aircraft motor produce 348 hp at 2,500 RPM

On Thursday, November 19, 2015 at 5:31:04 PM UTC-5,
Unfortunately the laws of physics says this is highly inefficient.

The efficiency is of minor importance when doing things like charge a
cell phone with takes milliwatts, but becomes totally impractical at
the megawatt level it would take to power even a small vehicle.


--
Jim Pennino

A circuit model is presented along with a derivation of key system concepts, such as frequency splitting, the maximum operating distance (critical coupling), and the behavior of the system as it becomes undercoupled. This theoretical model is validated against measured data and shows an excellent average coefficient of determination of 0.9875. An adaptive frequency tuning technique is demonstrated, which compensates for efficiency variations encountered when the transmitter-to-receiver distance and/or orientation are varied.

http://ieeexplore.ieee.org/xpl/login...er% 3D5437250