Hi all,

I have a circuit mounted on a fan, doing about 3000 rpm. This circuit has=
=20
to be powered with 5v, 30 mA. I can't use brushes because they slow down =
the=20
fan too much.
I tried to make an "open transformer": an open coil (not rotating) with a=
=20
smaller coil with iron core inside it (not touching the other coil, and=20
rotating).=20
Both coils have ~30 windings.
Using 50 Hz 5v 500 mA at the primary side,=C2=A0only 300 mV shows up at t=
h=20
secondary side with short-circuit current of 1 mA.
Should I use a higher frequency, or just make the coils larger with more=20
windings?
(or is this never gonna work and you have a better idea?)=20

Thanks in advance,
Koen van Leeuwen

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