On Fri, 30 Aug 2002, Dmitriy A. Kiryashov wrote:

>I have a feeling that there is way to transfer AC power
>to rotating board without any contacts. Am I right ? ;)

Yes, there are rotary transformers. Also what you were thinking of but
using ac not dc for the stator windings. This helps with startup. In
theory it would be possible to build a custom rotor for a shaded pole ac
motor that contains power pickoff coils in the rotor besides the squirrell
cage. Such motors are made for fans, they have the rotor fully accessible
for hacking (the bearings are all on one side).

>Also how to get rid of opto sensor of "null" position ?

By making a notch in the magnetics so the field drops or increases at a
certain angle.

Peter

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