On Tue, Mar 8, 2011 at 3:04 PM, Kirk Wallace <kwall...@wallacecompany.com>wrote:
> On Tue, 2011-03-08 at 14:02 -0600, Igor Chudov wrote: > ... snip > > > Another thing is that for all static and rotary converters I have seen, > > > the single phase is passed right through and the converter creates a 90 > > > (or 270) degree phase, so you get 0, 90 and 180 degrees instead of 0, > > > 120 and 240 degrees. A three phase motor should run more smoothly with > > > evenly spaced phases, but on the other hand, I haven't noticed any > > > problem with my lathe that uses the converter. > > > > > > > > This is not true, phases are evenly spaced on mine. I use run capacitors. > My > > voltages are very close to each other L1-L2, L1-L3, L2-L3. > > I'm not talking about voltage balance. I'm talking about voltage phase > angles. You can only have equal voltages l1-l3, l2-l3, l1-l2, at 120 degree phase angles. i > > If you consider the rising zero crossing of L1 to be zero > degrees and the next L1 rising crossing to be 360 degrees, for normal > three phase, L2 will cross 120 degrees after L1, and L2 at 240 degrees. > For the converters it's 0, 90, 180 or 0, 180, 270. (Picture attached) > > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA > > > ------------------------------------------------------------------------------ > What You Don't Know About Data Connectivity CAN Hurt You > This paper provides an overview of data connectivity, details > its effect on application quality, and explores various alternative > solutions. http://p.sf.net/sfu/progress-d2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
