Re: [ATM] A powered alt-az ground-board

["Don Clement" <don_clement@charter.net>]

Perhaps a better method of transmitting power through a rotating mechanical
joint than using the direct contact (and  noisy) slip ring would be to use
non-contact magnetic induction and AC current through a pair of coils. The
ac power could be easily rectified and filtered to DC on the scope end.



Don Clement

Running Springs, California



>
> I believe the correct term is slip ring as a commutator is meant to
> periodically reverse the current direction as used in a DC motor. see:
> http://en.wikipedia.org/wiki/Commutator_%28electric%29 &
> http://en.wikipedia.org/wiki/Slip_rings
>
>
>
> Don Clement
>
> Running Springs, California
> >
> > --- Shane LaPierre <shane@ct-astronomer.com> wrote:
> >
> > > I want to provide a power supply thru the ground
> > > board of
> > > my 20" scope .... I have thought of just having
> > spring-loaded contacts
> > > press
> > > against 2 separate round conductive circles.
> >
> > Isn't that called a commutator?  Could probably dig up
> > some ideas by googling that (there's even something
> > called the Industrial Commutator Company).  There are
> > lots of designs for commutators and brushes for
> > electric motors and generators (and, I imagine, for
> > instrumentation systems on rotating platforms, where
> > contact noise would be an issue).  Not that I've ever
> > tried it, but I would guess you won't have to reinvent
> > the (conductive) wheel for this project.
> >
> > Ross
> >
> >
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> >
>
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