Hi Brett,

Interesting thought Brett!

Of course co-joining S to S, is a real (like near impossible) mechanical
"bear" with same pole/s repulsion.   One could mentally
intertain the though of using a non-magnetic spacer inbetween (probably at
least 1/4" thick) to greatly ease up on the mechanical
magnet containment support, AND, here is where one would absolutely need a
centered bolt to get the necessary N pole attraction
and coil induction.  I'd think it could possibly provide a more throughly
uniform field more totally through the coil yes.  Such a
arrangement might allow using the thinner ring magnets (like cheaper) for
use.  The use of a non-magnetic spacer will
seem to give much more vertical latitude for seismometer drift problems
also.

Mentally if one goes further with possibilities, "if the coil, had high
enough length; it could also work "without"
the center bolt; as then the flux can pass through the top/bottom N pole
fields.  Here also, the thought of multiple
same size coils stacked, "might" provide sensor induction and or perhaps
some limited mass damping fine tuning.

Take care, Meredith Lamb

On Mon, Jun 2, 2008 at 10:44 AM, Brett Nordgren 
wrote:

> Meredith,
>
> Would it possibly work better if the ring magnets were oriented N-S - S-N?
>
> Regards,
> Brett
>
> At 10:00 AM 6/2/2008 -0600, you wrote:
>
>> Hi all,
>>
>> Hmmm, here is a new/old speaker/voice coil speculation idea, which I don't
>> think has been covered before in PSN email.
>>
>> It "assumes" you have a round coil that does reasonably fit the inside
>> diameter of a, and/or, a pair of round ring neodymium magnets;
>> and; ~ the total thickness of the neodymium magnets is at least greater
>> than the thickness of  the coil itself.
>>
>> You take 2 round ring magnets and simply co-join them N-S-N-S.  The field
>> where they co-join (S-N) will be quite
>> intense, and is where the movement of the coil will be most sensitive.
>>  This is the only real change/addition.
>>
>
>
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>
> To leave this list email PSN-L-REQUEST@.............. with the body of the
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>
Hi Brett,

Interesting thought Brett!

Of course co-joining S to S, is a real (like near impossible) mechanical "bear" with same pole/s repulsion.   One could mentally
intertain the though of using a non-magnetic spacer inbetween  (probably at least 1/4" thick) to greatly ease up on the mechanical

magnet containment support, AND, here is where one would absolutely need a centered bolt to get the necessary N pole attraction
and coil induction.  I'd think it could possibly provide a more throughly uniform field more totally through the coil yes.  Such a

arrangement might allow using the thinner ring magnets (like cheaper) for use.  The use of a non-magnetic spacer will
seem to give much more vertical latitude for seismometer drift problems also.

Mentally if one goes further with possibilities, "if the coil, had high enough length; it could also work "without"

the center bolt; as then the flux can pass through the top/bottom N pole fields.  Here also, the thought of multiple
same size coils stacked, "might" provide sensor induction and or perhaps some limited mass damping fine tuning.


Take care, Meredith Lamb

On Mon, Jun 2, 2008 at 10:44 AM, Brett Nordgren <Brett3mr@.............> wrote:

Meredith,



Would it possibly work better if the ring magnets were oriented N-S - S-N?



Regards,

Brett




At 10:00 AM 6/2/2008 -0600, you wrote:


Hi all,



Hmmm, here is a new/old speaker/voice coil speculation idea, which I don't think has been covered before in PSN email.



It "assumes" you have a round coil that does reasonably fit the inside diameter of a, and/or, a pair of round ring neodymium magnets;

and; ~ the total thickness of the neodymium magnets is at least greater than the thickness of  the coil itself.



You take 2 round ring magnets and simply co-join them N-S-N-S.  The field where they co-join (S-N) will be quite

intense, and is where the movement of the coil will be most sensitive.  This is the only real change/addition.






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