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. 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 On 4/29/2013 3:18 PM, Cecil Thomas wrote: > Thanks for all the inputs. I did quite a bit of research concerning > the effectiveness vs the amount of work vs the expense of getting the > machine on line and making chips. > 1. Tossing the entire drive train and replacing with a 10 hp 3ph > motor and vfd to run from 220 single phase...... can't be done... no > 10 hp single phase vfd available at any price. > > 2. same as above but use 7.5 hp vfd with back gear.... same problem > as above plus the backgear is PART OF the DC motor and requires > considerable machining and adapting to take the end bell from the old > motor and incorporate it into the new drive train. > > 3. Note that 1 and 2 are what Monarch does now for their "new" and > rebuilt 10ee's they are NOT for single phase 220 use. > > 4. Drive the existing system from a single phase in 5 hp vfd...... I > could not find a 5 hp single phase in vfd and even in the lower hp > ranges I was looking at $400 and up for which I would be buying all > kinds of bells and whistles which would be the proverbial mammary > glands on a male swine since the 3 ph motor must run at 60 hz for the > rest of the system to work correctly. Also I would be required to > bypass any and all means of control from the lathe itself so as not > to disconnect the vfd load downstream. > > 5. Replace the 3 ph motor with a 5 hp single phase motor...... > Probably the neatest solution but the motor and generator are a > single unit so the single phase motor would have to actually spin > both the motor and generator IF... there was room enough to mount the > extra motor and there's not. I even considered having the 3ph motor > rewound as single phase but a couple of local motor shops said they > were not even interested. > > 6. Toss the MG and install a DC control for the motor..... Most > integral hp DC controllers are rated 180 volts wide open.... he 10ee > generator produces from 0 to 300 volts to the motor armature. It > would be impossible to recreate that armature voltage from an off the > shelf controller and problematic to get there with a home built > one. The speeds above 1500 rpm are achieved by reducing field > voltage (120 V DC on the field up to 1500 rpm) so that would not be a > problem. 300 VDC from 220 VAC is a challenge. > > > 7. Make the existing 3ph motor single phase by installing a static > phase converter and giving up about 1/3 of the hp...... cheapest solution. > > 8. Buy a pretty prebuilt Rotary Phase Converter panel for $160 and > add a locally purchased used 7.5 hp idler for $0 and with a couple of > hours of running conduit and hanging the panel I'm in business. > > > Cecil > ------------------------------------------------------------------------------ > Try New Relic Now& We'll Send You this Cool Shirt > New Relic is the only SaaS-based application performance monitoring service > that delivers powerful full stack analytics. Optimize and monitor your > browser, app,& servers with just a few lines of code. Try New Relic > and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr > _______________________________________________ > Emc-users mailing list > [email protected] > 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
