On 4/30/2013 2:08 PM, John Kasunich 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 >> >>
Upon further investigation... you are correct. There really is no DC bus in those drives..unlike an inverter drive.. so nix that idea.. Dave ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
