lamination thickness versus eddy currents - RC Groups
Feb 05, 2008, 06:23 AM
homo ludens modellisticus
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
 Feb 05, 2008, 01:07 PM Registered User 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
 Feb 05, 2008, 01:46 PM edited Last edited by prinz; Nov 10, 2008 at 01:49 PM.
 Feb 06, 2008, 04:36 AM homo ludens modellisticus Not a half but a quarter of the original losses when halving the thickness. Vriendelijke groeten Ron
 Feb 06, 2008, 05:11 AM edited Last edited by prinz; Nov 10, 2008 at 02:00 PM.
 Feb 06, 2008, 09:00 AM Registered User 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!
 Feb 06, 2008, 12:08 PM edited Last edited by prinz; Nov 10, 2008 at 01:50 PM.
Feb 07, 2008, 08:19 AM
Registered User
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
Feb 07, 2008, 08:12 PM
Good Better Best quest.
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
Feb 08, 2008, 02:33 AM
Registered User
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!
 Feb 08, 2008, 04:59 PM Flying motor mount master 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
 Feb 08, 2008, 05:08 PM Registered User eddy current losses should decrease to (0.21/0.5)² of the initial losses, or a decrease by 82% unfortunately hysteresis losses dont... servus, Martin
 Feb 23, 2008, 03:58 PM X-Era Motors 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
 Feb 23, 2008, 05:59 PM homo ludens modellisticus For e-mail address see: www.powercrco.de Vriendelijke groeten Ron
 Feb 25, 2008, 02:24 PM X-Era Motors Maybe I'm blind...but I can not find his email on the www.powercroco.de. Could the google translator have eaten it?!!