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Old 15th April 2013, 08:28 PM   #251
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Thomas Spilcker View Post
.....should be a old german produkt.
ahh...looks to me like it could a half 'Rubanoide'
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Old 15th April 2013, 08:49 PM   #252
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Location: odense
Linaeum hôgtoner.de ?
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Old 17th April 2013, 11:22 AM   #253
tinitus is offline tinitus  Europe
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yes, I think you are right..Lineum might be the original, and right generic term

but it is not AMT
there is another thread about it

A DIY Ribbon Speaker of a different Kind
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Old 19th April 2013, 04:51 PM   #254
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Default magnet system

I don't know why nobody try to test U-shape magnet system of MUNDORF.
Here is the result of mine.
Please point it out if something wrongs are there.
Attached Images
File Type: jpg mag #1.jpg (264.3 KB, 394 views)
File Type: jpg mag #2.jpg (141.6 KB, 372 views)
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Old 20th April 2013, 08:33 AM   #255
solhaga is offline solhaga  Sweden
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I´m not familiar of the Mundorf system. Could you explain for example what´s magnetes and what´s pole pieces?

The field looks strong and even. Could you simulate b.t and b.n separately?
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Old 20th April 2013, 09:02 AM   #256
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I would like to see the femm.drawing too,and as solhaga wrote,it looks good.
I prefer the open model I use myself,but this one has stronger and more homogen field.

Bernt
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Old 21st April 2013, 07:08 AM   #257
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Quote:
Originally Posted by solhaga View Post
I´m not familiar of the Mundorf system. Could you explain for example what´s magnetes and what´s pole pieces?

The field looks strong and even. Could you simulate b.t and b.n separately?
Attached my magnet system in detail.
There are 6 magnets of 40x25X10mm, N35 and the inner steels are separated each other to be attached on the magnets perfectly.
The gap between the inner steels doesn't affect to the flux density so much.
Attached Images
File Type: jpg mag-1.jpg (42.9 KB, 324 views)
File Type: jpg mag-2.jpg (182.3 KB, 318 views)
File Type: jpg mag-3.jpg (59.3 KB, 308 views)
File Type: jpg mag-4.jpg (41.6 KB, 48 views)

Last edited by bsyoon; 21st April 2013 at 07:14 AM.
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Old 21st April 2013, 10:15 AM   #258
solhaga is offline solhaga  Sweden
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Just did a simulation of a much slimmer design of my AMT with an air gap of only 40 mm.
I get the same b.n strength as yours but even in the whole gap 0 - 40 mm.
The b.t field is zero in the whole gap 0 - 40 mm.

It is also much easier to make with straight rods everywhere.
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Old 21st April 2013, 11:02 AM   #259
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Quote:
Originally Posted by solhaga View Post
Just did a simulation of a much slimmer design of my AMT with an air gap of only 40 mm.
I get the same b.n strength as yours but even in the whole gap 0 - 40 mm.
The b.t field is zero in the whole gap 0 - 40 mm.

It is also much easier to make with straight rods everywhere.
Thanks for your reply !
Truly, the U-shaped magnet structure is not so simple to make.
I'd like to see your simulation.
Could you introduce your slimmer design ?
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Old 21st April 2013, 05:03 PM   #260
solhaga is offline solhaga  Sweden
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Default Small AMT

"Could you introduce your slimmer design ?"

Here you go.
Attached Images
File Type: jpg small amt.JPG (51.8 KB, 86 views)
File Type: jpg small amt ans.jpg (104.7 KB, 93 views)
File Type: jpg small amt bn.jpg (52.0 KB, 83 views)
File Type: jpg small amt bt.jpg (54.0 KB, 50 views)
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