Feb 05, 2008, 05:23 AM homo ludens modellisticus Netherlands, GE, Nijmegen Joined Feb 2001 13,815 Posts 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, 12:07 PM Registered User Joined Feb 2008 221 Posts 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, 12:46 PM Joined Nov 2006 732 Posts edited Last edited by prinz; Nov 10, 2008 at 12:49 PM.
 Feb 06, 2008, 03:36 AM homo ludens modellisticus Netherlands, GE, Nijmegen Joined Feb 2001 13,815 Posts Not a half but a quarter of the original losses when halving the thickness. Vriendelijke groeten Ron
 Feb 06, 2008, 04:11 AM Joined Nov 2006 732 Posts edited Last edited by prinz; Nov 10, 2008 at 01:00 PM.
 Feb 06, 2008, 08:00 AM Registered User Beaverdam Creek, VA Joined Aug 2005 2,322 Posts 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, 11:08 AM Joined Nov 2006 732 Posts edited Last edited by prinz; Nov 10, 2008 at 12:50 PM.
Feb 07, 2008, 07:19 AM
Registered User
Belgium, Flemish Region, Oosterzele
Joined Dec 2001
5,645 Posts
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, 07:12 PM
Good Better Best quest.
Australia, VIC, Langwarrin
Joined Apr 2004
10,742 Posts
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, 01:33 AM
Registered User
Beaverdam Creek, VA
Joined Aug 2005
2,322 Posts
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, 03:59 PM Flying motor mount master San Jose, California, United States Joined Oct 2004 8,745 Posts 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, 04:08 PM Registered User Joined Feb 2008 221 Posts 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, 02:58 PM X-Era Motors Newport, NC Joined Jan 2002 2,226 Posts 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, 04:59 PM homo ludens modellisticus Netherlands, GE, Nijmegen Joined Feb 2001 13,815 Posts For e-mail address see: www.powercrco.de Vriendelijke groeten Ron
 Feb 25, 2008, 01:24 PM X-Era Motors Newport, NC Joined Jan 2002 2,226 Posts Maybe I'm blind...but I can not find his email on the www.powercroco.de. Could the google translator have eaten it?!!