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Old 25th July 2014, 08:02 AM   #41
solhaga is offline solhaga  Sweden
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Default Back to the drawing board

Have tried to fit the VC in the gap.
Ideally, the gap is 4 mm and the VC 1,5 mm, so there a little more than 1 mm margin on each side of the VC.
So for sure, I can make it fit, but there will be no margins in any direction.
And the reality isn't ideal along the 500 mm long gap.

The VC is 4 mm in height so Xmax is modest too, only 3 mm ((10 - 4)/2).
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Old 25th July 2014, 08:12 AM   #42
solhaga is offline solhaga  Sweden
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Default Don't panic!

New magnet assembly coming up:

Click the image to open in full size.

The iron in the gap has changed from 3x10 mm to 2x15 mm.

This gives 2 mm of additional space in the gap (6 mm - 1,5 mm) and a longer Xmax (15 - 4 / 2 = 5,5 mm).

This comes at a cost of a lower field:

Click the image to open in full size.

But only 35 % lower (new gap to the right):

Click the image to open in full size. Click the image to open in full size.

I have also simulated 1,5x15 mm, that is a gap of 7 mm:
Click the image to open in full size.
It would work as well and is perhaps preferable, but that thin rods are hard to come by; you'll have to make them out of 1,5 mm steel sheets and then hard to get straight.
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Old 2nd August 2014, 09:02 PM   #43
Paul W is offline Paul W  United States
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Try substituting small Neo magnets for the small pieces of iron in the FEMM sims.
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Old 3rd August 2014, 08:26 AM   #44
solhaga is offline solhaga  Sweden
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I´ve been doing simulations on such circuits in the past and even if the field is stronger they are more suitable for ribbons as they have less linear excursion.
They are also harder to build.

Do you mean something like this:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 3rd August 2014, 09:40 AM   #45
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Maybe like this:

[IMG]data/1954/medium/amt_planar_drawing.JPG[/img][/IMG]
[IMG]Click the image to open in full size.[/IMG]
[IMG]img]http://origin.dastatic.com/forums/gallery/data/1954/medium/amt_planar_field_.JPG[/img][/IMG]
[IMG]Click the image to open in full size.[/IMG]
[IMG]Click the image to open in full size.[/IMG]
It is 5x10mm neo ,5mm gap.
But maybe you dont need a fieldstrength that strong.
It is a very long field compared to a "normal" speaker.2" voicecoil app.160mm.

Bernt

Last edited by båndsei; 3rd August 2014 at 09:49 AM.
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Old 3rd August 2014, 09:46 AM   #46
a.wayne is offline a.wayne  United States
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No image Bandsei .....!
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Old 3rd August 2014, 09:51 AM   #47
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Just started using DIY Audio gallery for images.

Bernt
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Old 3rd August 2014, 11:03 AM   #48
WrineX is offline WrineX  Netherlands
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nice one bandsei, some linear excursion there. verry even.
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Old 3rd August 2014, 11:42 AM   #49
solhaga is offline solhaga  Sweden
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Great idea to saturation at the bottom in order to limit the field in the gap.
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Old 3rd August 2014, 12:42 PM   #50
WrineX is offline WrineX  Netherlands
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Agt would you want to limit it ? If it's even then it is ok or am I missing something ? If you want lower field strength you can increase gap or use cheaper magnets ?
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