2013/1/8 Peter C. Wallace <p...@mesanet.com>: > 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? 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? -- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
