> Hi all, perhaps someone can help with a wee power problem. I've
> got a circuit board mounted on a motor shaft. The circuit is there to
> measure the movement of an escapement mechanism (kind of
> like a governor) as the shaft turns from 100 to 3500rpm. The
> circuit itself is not a problem, I've managed to attached a small
> slider pot to the escapement and it's measuring OK with an ADC.
> What I'd like to do is induce power to the circuit using some kind
> of magnet/coil system. I need around 15mA at 6VDC. A possibility
> is to use a 7-segment LED (synched with the rotation) to indicate
> the escapement movement, hence the power requirement. Using
> batteries is not really an option because of the duration of the
> measurements and particularly if the LED idea goes ahead. I've
> got plenty of envultured materials - strong HDD magnets and
> more scrap transformers (enamelled wire of all gauges and
> laminate cores) you can shake a stick at. I thought I may be able
> to attach a small DC motor to the main motor's shaft as a
> generator but that's proved too tricky because of space limitations.
> So, any ideas on the most efficient way to induce power into coils
> on the PCB from stator magnets ?
>
Modified Video Head mechanism from a Video Recorder ?

Chris Carr

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