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Old 12th March 2013, 04:41 PM   #201
solhaga is offline solhaga  Sweden
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So you will the stack 3x15 mm rods where every other rod is prolonged over the gap?
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Old 12th March 2013, 04:52 PM   #202
solhaga is offline solhaga  Sweden
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Thanks for the link.
Supermagnete has a N42 15x15x8. For 40 pieces incl shipping to Sweden: EUR 74.
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Old 12th March 2013, 05:08 PM   #203
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Every second layer is shorter.
[IMG]Click the image to open in full size.[/IMG]
[IMG]Click the image to open in full size.[/IMG]

Bernt
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Old 12th March 2013, 07:30 PM   #204
solhaga is offline solhaga  Sweden
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Looks great! The way you stack them makes the pieces easy to make by cutting.
Have you simulated 20 mm width (3x20 mm steel) as well?
The air has long way to travel with 30 mm.
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Old 12th March 2013, 08:05 PM   #205
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My drawing has not the right measures.Diaphragm is 40mm.,and fieldstrength is measured at 30mm.length.
I have tried 20mm width,fieldstrength decreases.
Air has only to travel 15mm. with the 15mm steel i use.
I have ordered the magnets from Polen.
Bernt
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Old 12th March 2013, 10:14 PM   #206
solhaga is offline solhaga  Sweden
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Yes, I got the dimensions of the magnets and the iron mixed up

15x3 mm steel will be perfect.

I have some 10x4 mm from an abandoned bass panel project.
Thought I might give it a try along with the favourite magnet dimension 40x20x10 N42.
FEMM says the same field strenght as yours above.

Click the image to open in full size.

Last edited by solhaga; 12th March 2013 at 10:24 PM.
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Old 12th March 2013, 10:33 PM   #207
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Quote:
Originally Posted by solhaga View Post
Yes, I got the dimensions of the magnets and the iron mixed up

15x3 mm steel will be perfect.

I have some 10x4 mm from an abandoned bass panel project.
Thought I might give it a try along with the favourite magnet dimension 40x20x10 N42.
FEMM says the same field strenght as yours above.
What field strength do you get with 10 mm and N52 ?
And with N52 and 6 mm ?

I bought some N35 because they was very cheap, but I did never test them due to they was only a fraction of the strength in practical use...

Last edited by RayCtech; 12th March 2013 at 10:38 PM.
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Old 13th March 2013, 04:34 AM   #208
solhaga is offline solhaga  Sweden
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The difference between the N:s is the square root of the division if I remember it correctly.
So N52 is 1,22 times stronger than N35. But you must analyze every circuit as there can be saturation (for iron it is 2T) that minimizes the fields.
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Old 13th March 2013, 06:15 AM   #209
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by båndsei View Post
I have just ordered 9meter 3x15mm iron to make my new magnetsystem.
I was wondering if the iron you ordered has a perfect square profile or has it got rounded edges like mine.
If they are rounded and you stack them, the surface to the magnetes will not be flat.
Do you plan to sand the iron in order to have an even surface?

BTW, I finally decided to go ahead with this. Just placed an order of 40 pieces of 40x20x10 N42s.
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Old 13th March 2013, 06:32 AM   #210
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The iron i ordered has perfekt square profile and it is not much more expensive.App.150 dkr for 12meter.

Bernt
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