Re: is the magnetic field really moving?

On Sat, 02 Aug 2008 05:11:40 GMT Don Kelly <dhky@[EMAIL PROTECTED]
> wrote:

| In one case you can measure the axle to rim voltage  but in your case
with 2 
| magnets it becomes a problem  as the spokes are in parallel. In this
case 
| you need to either open the loop or somehow measure any circulating
current 
| in the loop. A bit of a problem if you are trying to avoid extraneous 
| connections. However there are devices that can be put in line that 
| chemically measure charge transfer and using one of these and running
for 
| some time, you would, at least, get an indication whether there was a 
| current.

In the classic Faraday generator made with spokes (also, a solid disk can
be
consider an infinite number of spokes), they would be in parallel.  But in
the example I'm trying to give, they are in _series_ and also have
magnetic
differences that their motion difference (due to being on the 180 degree
side
of the disk) produce electric potential in the same direction.

So it's an issue of measuring the current through the loop that consists
of
2 spokes in series that may generate potential, and one or two paths
around
the edge that are not expected to generate potential because their motion
is in the same direction as the loop current flow would be (or opposite).


| However, all you will have is an awkward equivalent to a coil rotating
in a 
| field. It will not be a homopolar generator. -- 

If that works, I can expand on it.

I would next go to 12 spokes.  These would not go all the way back to the
axle, but instead might go only part way, such half way.  So on a disk
face
that is non-conductive (wood, plastic, etc), the spokes are attached from
the point of 0.5 radius to the point near 1.0 radius.

Consider the disk in the horizontal orientation so the axis is vertical.
Looking down on the disk you see the spokes made of copper wire.  The
spokes would be labeled "1" through "12" like the hour marks of a clock.
The EVEN spokes would have magnets above and below with N-pole facing up.
The ODD spokes would have magnets above and below with N-pole facing down.

The interconnection between the spokes would alternate.  EVEN spokes would
connect to the next higher spoke at the edge.  ODD spokes would connect to
the next higher spoke nearer the axis.  These connections would be aligned
such that their movement as the disk rotates would be in the same
direction
as current flow through them (so no potential is expected to be generated
in the connections).

Break ONE of the connections and insert the current measuring device in a
visible way (such as a light).  Rotate the disk (and conductors and
magnets).

If this generates electric potential, and current in the loop, then I
would
extend it further.  Two wires from the break can be run in parallel down
to
the axle.  A discontinguous axle made of conducting metal, but insulated
from
each other, would have one wire connected to one axle and the other wire
connected to the other axle.  A brush on each axle could take the power.

The next extension would be in the form of a lot more spokes and the
copper
wire running round and round through these spoke positions many times.  So
if I go to 24 spokes and loop the wire 100 times, I should have 2400 times
the voltage of a single spoke.

This all depends on whether an electric potential can be generated in a
wire
_in_ a magnetic field as opposed to _through_ a magnetic field.

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