How to provide power to a spinning circuit ?

Hi Tauno,

The coils would have to be perpendicular to the shaft, not wound around it. For example, you could have several oblong coils wound on flex or baked into a molding and the winding would never loop around the shaft. You could even have only one coil but that is difficult to mount and clean unless you use a flex circuit that can be wrapped around and held at a distance from the shaft's surface. The thing is to create an antenna that has a reasonable effectiveness.

Yes, the air gap can be a problem. But it may be ok if you only need little power and there is no hardcore limit on primary power (not battery powered etc.).

Regards, Joerg

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Reply to
Joerg
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If you already have something rotating, why worry about any funny transmissions. Just create a magnetic field with a permanent or electromagnet, mount some sort of coil on the rotating device, and presto, you have an alternator. The real power source is whatever is doing the spinning.

I am coming in late, so I may well have missed something mentioned earlier.

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Reply to
CBFalconer

In this particular case, IIRC it spins too slow and needs too much power for that the be practical.

A rotating transformer is the best answer in this case. It's just like any other transformer, except the primary and secondary can rotate relative to each other. Standard, off-the-shelf technology.

Reply to
Guy Macon

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