SCR dc drives? Is this the 70's? LOL. Im kidding. But only partially:)
SMD On Tue, Apr 30, 2013 at 2:08 PM, John Kasunich <jmkasun...@fastmail.fm>wrote: > > > On Tue, Apr 30, 2013, at 01:37 PM, Dave wrote: > > You will have $3-400 into a 10 hp phase converter in no time. (I have > > put a few together). If you need three phase for other things.. go the > > phase converter route and see how that works. > > > > If you are going to run the lathe a lot, I would look for a relatively > > new Industrial DC drive that is compatible with your motor. Not the > > little guys, but the industrial variety.. They are normally rated in > > amps of armature current. > > > > They still make them. Siemens has some really nice DC drives. I setup > > a number of them for a plant that uses them to draw copper wire. They > > were 25-75hp. > > > > I bet you can run most of them off single phase. It should not be > > difficult to fool the drive into thinking that it has all three phases - > > use a power capacitor to connect non-connected phase etc. > > Actually it is much harder to run a DC drive on single phase. Most > industrial DC drives that I'm familiar with use phase controlled SCRs > to run the motor. They simply will not run on single phase, no way, > no how. And they won't run on fake three-phase coming from a > static phase converter (capacitors only). They might run on three > phase from a rotary converter, but I wouldn't hold my breath. > > > > > Just derate the drive. If you need a real 10 hp, look for a drive that > > can handle a 15 hp DC motor. The better drives have overtemp alarms and > > auto shutdown so burning one up should be difficult. > > > > If you keep looking your should be able to find something for less than > > $750. > > > > There are a lot of DC drives on Ebay. > > > > Dave > > > -- > John Kasunich > jmkasun...@fastmail.fm > > > ------------------------------------------------------------------------------ > Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET > Get 100% visibility into your production application - at no cost. > Code-level diagnostics for performance bottlenecks with <2% overhead > Download for free and get started troubleshooting in minutes. > http://p.sf.net/sfu/appdyn_d2d_ap1 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
