Is the lamination stack welded? This could provide a outside rigid axis for the laminations to "pivot" against, given that any impregnation will be more compressible than the weld. Welds may also distort the stack.
Best Regards David Greig ______________________________ GigaDyne Ltd Buchan House Carnegie Campus Dunfermline KY11 8PL United Kingdom t: +44 (0)1383 624 975 www.gigadyne.co.uk ______________________________ From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of drcuthb...@micron.com Sent: 22 December 2005 00:34 To: j...@jmwa.demon.co.uk Cc: christopher.col...@harmanpro.com; emc-p...@ieee.org Subject: RE: What Makes A Transformer Hum (continued) John, You are correct. The load current does not change the core flux density. The two transformer scheme can eliminate core saturation only if the transformers are series connected. That will cut the flux density in half while also cutting the total system core loss in half. The total system copper losses are doubled. Dave Cuthbert Micron Technology, Inc. From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Wednesday, December 21, 2005 10:42 AM To: drcuthbert Cc: christopher.col...@harmanpro.com; emc-p...@ieee.org Subject: Re: What Makes A Transformer Hum (continued) In message <f72651ec60c2c945878cf1cf6a3e5af401bc8...@ntxboimbx13.micron.com>, dated Wed, 21 Dec 2005, drcuthb...@micron.com writes >The consensus is that the core is saturating. This sounds like the best >hypothesis. A quick fix is to parallel another transformer if there is >room for it. Just make sure that the turns ratios is exactly the same. I don't see how that would work. The induction is determined by the supply voltage, not the load current. -- Due to a virus attack, I've lost all my clever signature tags. Are you sorry? OOO - Own Opinions Only. See http://www.jmwa.demon.co.uk and http://www.isce.org.uk John Woodgate - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc -- Virus scanned by Lumison. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
