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Old Feb 05, 2008, 06:23 AM
Ron van Sommeren is offline
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Discussion

lamination thickness versus eddy currents


See Ryan Biffard's and other messages:
http://groups.yahoo.com/group/lrk-to...iscount=30&l=1

Vriendelijke groeten Ron
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Old Feb 05, 2008, 01:07 PM
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Hi!

I could not find a formula to directly calculate the losses there. I found this pdf with a formula on page 7. Unfortunately in german, and with a pitfall for non-insiders: The losses are in Power per Weight.

And of course the formula only fits to thin laminations compared to their width.

http://neu.bucher-handel.de/media/bi... und Blech.pdf

servus,
Martin
Old Feb 05, 2008, 01:46 PM
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Old Feb 06, 2008, 04:36 AM
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Not a half but a quarter of the original losses when halving the thickness.

Vriendelijke groeten Ron
Old Feb 06, 2008, 05:11 AM
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Old Feb 06, 2008, 09:00 AM
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So if I made stator plates out of some really thin shim stock, say .002" (.05mm, I think...), would the thinness make up for the lack of silicon (resistance)?

Good Luck!
Old Feb 06, 2008, 12:08 PM
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Old Feb 07, 2008, 08:19 AM
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Quote:
Originally Posted by prinz
I have really 0,07mm thick plates made from a very special cobalt alloy.
insulating will be made with micro-microballoons for 0,005mm insulation thickness.
, but
Old Feb 07, 2008, 08:12 PM
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Quote:
Originally Posted by BeavrdamElectric
So if I made stator plates out of some really thin shim stock, say .002" (.05mm, I think...), would the thinness make up for the lack of silicon (resistance)?

Good Luck!
The silicon is not for resistance but for forming strandlike barriers/fences to guide the lines of force into streams and control any side movements into adjoining laminations causing collisons/hinderence that generate heat,so im led to believe
Old Feb 08, 2008, 02:33 AM
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Quote:
Originally Posted by olmod
The silicon is not for resistance but for forming strandlike barriers/fences to guide the lines of force into streams and control any side movements into adjoining laminations causing collisons/hinderence that generate heat,so im led to believe
Thanks, olmod - good information!

Good Luck!
Old Feb 08, 2008, 04:59 PM
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Hmmmm most cheap motors use .5mm lams and the better ones use .21 lams so you can expect an decrease in losses around 25%..

I'll have to see how that formula plays out with several of my motors...

Thanks,
B
Old Feb 08, 2008, 05:08 PM
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eddy current losses should decrease to (0.21/0.5) of the initial losses,
or a decrease by 82%

unfortunately hysteresis losses dont...

servus,
Martin
Old Feb 23, 2008, 03:58 PM
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Prinz...I can't find out how to contact you. I've got some questions about sourcing stator laminations. Send me a PM with your email address if it's not too much trouble. (sorry for hijacking the thread...I'll delete this message soon
Old Feb 23, 2008, 05:59 PM
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For e-mail address see:
www.powercrco.de

Vriendelijke groeten Ron
Old Feb 25, 2008, 02:24 PM
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Maybe I'm blind...but I can not find his email on the www.powercroco.de. Could the google translator have eaten it?!!


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