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Old 16th January 2012, 12:59 PM   #21
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Default The magnets are here

The magnets arrived today
They are very nice!
I've broken a pair just sorting the lot, very fragile
The pics later; this ipad is nice, but has limitations on posting pics
The experiments are scheduled for tomorrow, wife allowing
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Old 16th January 2012, 04:33 PM   #22
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Default Optimization of magnetic field

Hi
I'm trying to optimize the limited number of magnets on existence.
there are three main configurations possible, A, B and C
Anybody can tell which has the better field?
I'm pairing the magnets in order to get an workable Epsilon layout.
in any case, the gap should be 1 Cm for practical matters, mainly a decent membrane surface, about 13X16 Cm
The available magnets are 90 units per speaker.

Thanks on advance
Any advice is welcome

the magnets are these: supermagnete - Q-20-04-02-N: Bloque magnético 20*x*4*x*2*mm

Bloque magnético
Cód. artículo: Q-20-04-02-N
Material: NdFeB
Forma: Bloque
Tamaño: 20 x 4 x 2 mm
Tolerancia: +/- 0,1 mm
Peso: 1,2 g
Recubrimiento: Niquelado (Ni-Cu-Ni)
Magnetización: N45
Fza. sujec.: aprox. 1,2 kg
Temperatura máxima de empleo: 80°C
Ficha técnica en PDF
20 mm4 mm2 mm
Imanes (N45) extrafuertes.
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Old 16th January 2012, 04:37 PM   #23
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Default The pics of the configurations

Sorry, the pics of the configurations are missing in the previous reply

here they are (or so I hope
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Old 16th January 2012, 04:40 PM   #24
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Hope in vain: mad:

"this time it surely go" (famous last words )
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Old 16th January 2012, 08:03 PM   #25
gootee is offline gootee  United States
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Why not like drawing "A", but with only one magnet on each side?
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Old 17th January 2012, 12:55 AM   #26
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Quote:
Originally Posted by karellen View Post
Hope in vain: mad:

"this time it surely go" (famous last words )
Scheme A will yield the best results.
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Old 17th January 2012, 12:01 PM   #27
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Quote:
Originally Posted by gootee View Post
Why not like drawing "A", but with only one magnet on each side?
Thanks for helping
The problem using one magnet is that they want to be together and you need to glue them to the base (well, on previous atempts at last). If you stack them they remain in place without glue, due to the increased down force.
However its a configuration too good and simple to be fully discarded.

Regards

Pedro
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Old 17th January 2012, 12:06 PM   #28
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Quote:
Originally Posted by rockguitardude View Post
Scheme A will yield the best results.
Thanks for helping

I think I will do a comparision between A and C

The C is intended for an epsilon layout, hence the increased width of the dual magnet configuration.
Hope this not shortcircuit the magnetic field...

Thank you again

Pedro
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Old 18th January 2012, 12:43 PM   #29
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Default Ready for testing

Ready for testing the two configurations; Epsilon and standard
rougly same size, same amount of magnets, same semi-skilled constructor...
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Old 18th January 2012, 12:51 PM   #30
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Default the epsilon first

I've just put together a test rig for an epsilon layout;
a little more than 2 Ohms.
the finish i'snt Apogee standard, I know, but it's just a test bench for that tecnology

and does it works?
yes

I'll try to write details later (it's lunch time!)
"La panza es primero"
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