On Thursday, March 10, 2011 01:49:45 AM Igor Chudov did opine: > On Wed, Mar 9, 2011 at 11:57 PM, Jon Elson <el...@pico-systems.com> wrote: > > gene heskett wrote: > > > On Wednesday, March 09, 2011 08:02:40 PM Jon Elson did opine:>> > > > The > > > > current draw of > > > > >> a 100 Hp motor on 240 V is about 330 A per line! Yikes, the > > >> transistors must be the size of a brick! > > > > > > I am wondering where you got those figures Jon? > > > > OK, I was extrapolating from a 1 Hp Bridgeport motor, which is rated > > at 3.3 A at 240 V. Obviously, there is an efficiency scaling factor > > I didn't take into account for larger motors. > > Look at this baby: > > http://goo.gl/QBuc1 > > 100 HP motor by Baldor > > They say it takes 224 amps at 230v. > And my guess is that it is wasting some of that, note the ducted fan on the back end, and all the fins for cooling that the fan is directing air over.
That 20hp I'm talking about was pretty much conduction cooled. No fan on the back or fins. Its been a long time but I'd guess that 20 weighed 400+ lbs. Bottom line is its probably quieter than an Ajax, who carried the compact to extremes. The water/coolant pump was a 15hp, and we had 2, one a nice quiet GE motor, the other, same rated power but heavily fan cooled and its running noise level was 60 db louder than the GE. So when we needed to put seals etc in the GE, we busted a gut because OSHA would never have allowed us in the same room with that Ajax without some decent gun muffs. The ajax was strictly an emergency use only pump. I'd guess that Ajax weighed under 200 lbs, tiny, IMO too tiny. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) <http://tinyurl.com/ddg5bz> It's fabulous! We haven't seen anything like it in the last half an hour! -- Macy's ------------------------------------------------------------------------------ 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
