On Tue, 8 Jan 2013, Viesturs L?cis wrote: > Date: Tue, 8 Jan 2013 21:28:48 +0200 > From: "[UTF-8] Viesturs L?cis" <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Subject: Re: [Emc-users] LinuxCNC craziness > > 2013/1/8 Peter C. Wallace <[email protected]>: >> On Tue, 8 Jan 2013, Viesturs L?cis wrote: >>> >>> Should I get a ring for each lead or should I use all 4 leads of each >>> motor on one ferrite ring? >>> And is it enough to simply run them through the center or should I >>> wrap it around at least once (put through center, wrap around and once >>> again through center in the same direction as first time)? >> >> You should put the U/V/W wires (not the ground) from one channel all through >> one ring (this is what called a common mode choke it has 0 net current flow >> so >> does not saturate from the motor current) >> >> The point of this is to add some series impedance to the (very stiff) 28V >> square wave driving into the cable and motor stator winding/frame >> capacitance. This limits the amplitude of the current spikes created by >> driving into this capacitance. > > Thanks for the explanation! So is it enough just to put it through > once or should I wrap at least once around the ferrite?
This depends a lot on the ferrite characteristics. You will probably have to experiment. > > Since previous replies have got me into considering of replacement of > motor wires to something with a shield, I have a question - what would > be minimum recommended wire lead "thickness" (I mean the area in mm^2) > for 7i39 drive? the 7I39 can supply 10A continous max through one phase so 14 Ga is about right but 12 Ga would be better (~2 to 3.3 MM^2) > > -- > Viesturs > > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > Master SQL Server Development, Administration, T-SQL, SSAS, SSIS, SSRS > and more. Get SQL Server skills now (including 2012) with LearnDevNow - > 200+ hours of step-by-step video tutorials by Microsoft MVPs and experts. > SALE $99.99 this month only - learn more at: > http://p.sf.net/sfu/learnmore_122512 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Master SQL Server Development, Administration, T-SQL, SSAS, SSIS, SSRS and more. Get SQL Server skills now (including 2012) with LearnDevNow - 200+ hours of step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only - learn more at: http://p.sf.net/sfu/learnmore_122512 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
