Kirk, I believe that now you got everything completely right. i
On Mon, Mar 14, 2011 at 2:42 PM, Kirk Wallace <kwall...@wallacecompany.com>wrote: > On Mon, 2011-03-14 at 17:58 +0100, Peter Blodow wrote: > ... snip > > A capacitor connected to one leg of the two-phase system produces a 90 > > degree phase shift relative to this lead. Using this as a mock three > > phase system, you will have 180 + 90 +90 degrees for a revolution > > including a direction information, depending to which leg you connected > > the capacitor. The distribution is uneven which is the reason for > > reduced power, but better than nothing. Don't confuse this with a > > starter capacitor used to supply a direction information to a generic > > two phase motor! Those are for short time use with small motors only and > > blow their tops when used continously (because of faulty starter relay > > or so). > > In case my attachment doesn't go through, here is my graphical study of > a rotary three phase converter: > > http://www.wallacecompany.com/machine_shop/EMC2/three_phase_converter-1a.png > > The 180 degree voltage phase shift is only an issue if neutral is used, > but it is not. I think the decrease in efficiency is due to using one > phase to try to generate two more and the currents are much higher than > normal. (Viva VFD's) > > > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA > > > > ------------------------------------------------------------------------------ > Colocation vs. Managed Hosting > A question and answer guide to determining the best fit > for your organization - today and in the future. > http://p.sf.net/sfu/internap-sfd2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
