interesting motor design from Thingap,DC Ring Motor Powers 600-lb. Thrust Ducted

[helicoil]

Came across this motor, never heard of these before.
wonder if the same idea could be used to generate power.

quote from ThinGap Announcement

ThinGap
developed a patented technology, which replaces the
iron core and wire windings of conventional motors
with a precision-machined copper sheet. This has
eliminated such issues as hysteresis, iron losses,
and cogging torque, while substantially reducing the
impact of eddy currents and back emf. The copper
sheets allow higher copper density and a higher
copper to total volume ratio, making ThinGap a
performance leader in high efficiency and power
density motors.

DC Ring Motor Powers 600-lb. Thrust Ducted-Fan
VENTURA, CA â€" April 20, 2010 â€" ThinGap LLC, a leader in high power density DC motors, today
announced a TG14090 Brushless DC Ring Motor that delivers 122 kW of shaft power, allowing a
ducted-fan to generate 600 pounds of thrust, depending on the fan blade design. The motor
provides an exceptional power to weight ratio â€" 6.4 HP per pound; a compact package that fits
the control inside the motor and low thermal load characteristics.


“ThinGap’s 14-inch electric ring motor allows a ducted fan to develop as much thrust as with a
gas engine, which is a game-changing milestone,” said Rean Pretorius, president, ThinGap, LLC.
“At 6.4 HP per pound, its power to weight ratio has not been achieved by any electric motor
currently in production and exceeds the aerospace engineering threshold of 5 HP per pound. The
advantage is much quieter operation for stealth, and less weight, which can be critical for UAV
surveillance and close support tactical applications.”


http://www.thingap.com/pdf/technologypaper.pdf

http://www.thingap.com/pdf/tg14090motor45clean.pdf

http://www.thingap.com/pdf/tg14010ds.pdf

[helicoil]

found some info on generators.
news of there turbo generator,
ThinGap’s motors and generator technology replaces the iron core/laminations and wire windings used by conventional motors with a precision thin copper sheet. According to the company, the motors provide higher power-to-weight ratios, a wider range of speed and torque capabilities, improved heat dissipation and lower electrical resistance. The same technology would be applied to the Turbo Generator. (4/29/09).
Does this mean they developed a cog free generator.

[Airstriker]

Every air core generator will be cog free. But cogging is not the only "thing" that slows down the motor. Cogging is not caused by BEMF and vice versa. BEMF will not be eliminated in this motor. Cogging is caused by the attraction between magnet and the core. If you don't have a core (you have air core), you don't have cogging.