Re: magnetic field confinement

On Thu, 11 Sep 2008 14:17:27 -0700 (PDT) whit3rd <whit3rd@xxxxxxxxx> wrote:
| On Sep 10, 12:06?pm, phil-news-nos...@xxxxxxxx wrote:
|> There are 4 identical magnet pieces which are round like a cylinder
| [... long descriptioin ofmoving magnets omitted]
|> What I am looking for is any portion of the wire that would have a field and
|> motion that would induce a potential in the opposite direction around the loop.
|> I don't see any.
|
|> this construction should induce a current around the loop in a specific
|> direction.
|
| The induced current depends on the flux through the loop, and
| any cyclic (repeating) movement of magnets will return to the same
| flux condition once per cycle... thus, the time derivative of the
| flux averages to zero; this means the loop induction is an AC current,
| not a 'specific direction' i.e. a DC current.

The field will be oriented the same across the conductor, and the motion will
always be in the same direction. So I don't see how an AC current can be
induced. It could be AC if something alternates, such as the field changing
back and forth.


| That 'time derivative of the flux' is proportional to the induced
| voltage
| on the coil, of course. It is normal procedure to use a diode,
| or a switch, to make the alternating induced voltage produce a DC
| current, if that's wanted. Even using magnetic materials that
| switch character, the flux cannot rise to infinity, it MUST induce
| AC in the coil (high magnetic fields would mechanically destroy
| the materials of your apparatus if you had some scheme that
| really DID drive flux ever-higher).

What is "wanted" is a construction to extend the Faraday disk to a higher
voltage. Instead of rotating the disk under a stationary magnet, I am
rotating the magnet next to a stationary conductor which is repeated in
a loop. The additional rotating magnets are to arrange the field so that
I do not run into the problem Faraday did.

Remember, the Faraday disk induces DC, not AC. That is because there is a
constant motion of the conductor orthogonal to the magnetic field, inducing
the potential in the 3rd dimension. My arrangement has the same principle.

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Relevant Pages

  • Re: magnetic field confinement
    ... | any cyclic (repeating) movement of magnets will return to the same ... | flux condition once per cycle... ... this means the loop induction is an AC current, ... Instead of rotating the disk under a stationary magnet, ...
    (sci.physics.electromag)
  • Re: magnetic field confinement
    ... |>> | flux averages to zero; this means the loop induction is an AC current, ... |>> The field will be oriented the same across the conductor, ... Instead of rotating the disk under a stationary magnet, ...
    (sci.physics.electromag)
  • Re: what motion? what velocity?
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