So the magnet spins with the PCB and the current is flowing radially
from the axel to the internal copper surface to the ring to the brushes,
THROUGH the circular insulation?

Sherpa Doug

> -----Original Message-----
> From: Vasile Surducan [mailto:vasile@L30.ITIM-CJ.RO]
> Sent: Monday, October 08, 2001 6:33 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: "no variance, no induced currents" (was:
> Effects of a
> magnet on a PIC ?)
>
>
> On Fri, 5 Oct 2001, Robert Rolf wrote:
>
> > If the field is NOT varying, the effect should be nil.
> > No variance, no induced currents. I don't think that the silicon
>
>
> Robert, I propose you a simple experiment who, if will not change your
> ideeas, will made from you a deeply thinker (I'm partially agree with
> your explanation )
>
> Take a circular magnet ( like those used in 20W...50W speakers ), you
> need a good one to have a strong magnetic field, but the experiment is
> working with any magnet). Solder the magnet using a good glue
> ( poxipol or
> other bi-component resin ) to a single side layer PCB.
> The PCB may be a square one or better have a round surface
> one ( a 10 cm
> diameter or more ) On the copper side do a circular
> insulation to obtain
> an external copper ring and an internal copper surface inside
> a circle.
> Twirl THE WHOLE ENSEMBLY with 1500...5000 rpm, so the
> magnetic field on
> the copper surface WILL BE ALWAYS CONSTANT except a small
> interaction with
> the earth's magnetic field.
> So you say: "no variance, no induced currents"
> Using a multimeter and two brushes, measure the current
> between internal
> copper circle and the external copper ring. Should be none isn't it ?
> ( it's up to mA on this simple device and up to few amperes
> if the brushes
> are made by mercury with low electrical contact resistence...)
> There are a few electricity generator patents with this subject.
> Take your on conclusions...
>
>
> regards, Vasile
>
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