M. Adam Davis wrote:
> There are patents galore covering this technology.  I suspect the main
> issues are the fact that the core is split and you need a specially
> shaped core to get the best possible, but still low, efficiency.

The maximum energy transfer for the mass and volume may be low due to the
large air gap, but that does not mean efficiency has to be low.

One of our current projects is the follow on to a rotating LED display.  A
picture of the existing product is at
http://www.embedinc.com/olin/eyeball.jpg.  Power is transferred to the
rotating arm via a transformer with rotating secondary.  In this version the
primary is driven directly from wall power.  The new version has a lot more
LEDs and requires 10s of watts.  In that the secondary is chopped at 10s of
KHz and works quite well.  Efficiency is reasonable.


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