On Wed, Apr 6, 2011 at 3:14 PM, gene heskett <ghesk...@wdtv.com> wrote:
> On Wednesday, April 06, 2011 04:02:33 PM andy pugh did opine: > > > And now the cap sizing. > > If I say that I can put up with 10% ripple at max rated current (7.5A > > for the motors) on a nominal 300V then I end up with > > C = 7.5A X 10mS / 30V = 2500uF. > > > > Eeek! > > > Understatement Andy, it will weld relays closed with the inrush unless > surge limited. And for 60hz power, your 10ms would be 8.33333333333 for a > full wave bridge. > > Why, the relay is connecting the poles of the capacitor through a resistor. It is current limited. > > ------------------------------------------------------------------------------ Xperia(TM) PLAY It's a major breakthrough. An authentic gaming smartphone on the nation's most reliable network. And it wants your games. http://p.sf.net/sfu/verizon-sfdev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
