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Author Topic: Magnetic attraction vs steel laminating direction  (Read 6375 times)

Offline Low-Q

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Magnetic attraction vs steel laminating direction
« on: February 06, 2011, 11:33:16 AM »
I have a dumb question, but better to ask than not finding the answer at all...

Anyways, does anyone know if there is a difference in magnetic attraction between a magnet and a laminated steel bar, depending on the lamitate alignment?

Bad example below, but I hope you understand.

|||| [magnet]

versus:
___
=== [magnet]

The direction of lamination are shown s above. Will the magnet be less/different attracted in the first vs. last example above?

Vidar
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Offline broli

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Re: Magnetic attraction vs steel laminating direction
« Reply #1 on: February 07, 2011, 10:45:03 AM »
I think there would be a small difference that depends on lamination spacing. The larger the spacing the more attractive the vertical version would be I'd say.
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Offline Low-Q

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Re: Magnetic attraction vs steel laminating direction
« Reply #2 on: February 07, 2011, 04:36:29 PM »
Quote from: broli on February 07, 2011, 10:45:03 AM
I think there would be a small difference that depends on lamination spacing. The larger the spacing the more attractive the vertical version would be I'd say.
Let's say that such a laminated steel bar are approaching a disc magnet in the most attractive alignment. Then, right under the disc magnets S or N pole, we twist the bar 90 degrees, and let it escape in the same direction, but with less attraction... I should know the "real" outcome, but it is an idea - at least :)

Vidar
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Offline exnihiloest

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Re: Magnetic attraction vs steel laminating direction
« Reply #3 on: February 08, 2011, 10:38:03 AM »
Quote from: Low-Q on February 06, 2011, 11:33:16 AM
...
Anyways, does anyone know if there is a difference in magnetic attraction between a magnet and a laminated steel bar, depending on the lamitate alignment?
...

There is not. The magnetic domains are of much tinier dimensions than the lamination thickness, so they are not dependent on the lamination alignment. The only role of the lamination is to avoid induced currents, with no consequences onto the magnetic flux.

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Offline Low-Q

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Re: Magnetic attraction vs steel laminating direction
« Reply #4 on: February 10, 2011, 03:00:48 PM »
Quote from: exnihiloest on February 08, 2011, 10:38:03 AM
There is not. The magnetic domains are of much tinier dimensions than the lamination thickness, so they are not dependent on the lamination alignment. The only role of the lamination is to avoid induced currents, with no consequences onto the magnetic flux.
Thanks for the infomation. I also tried this on a laminated steel core in the inductors we sell for DIY speakers. You're totally right.

Vidar
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