FWIW, Solution to #1 is typ easy. Large VFDs typ bring out the DC bus for more filtering caps if needed. Add additional external caps (need appox double whats internal) and add a large external rectifier to the caps. Basically, feed the VFD dc. You'll need to disable phase loss detection just like running any other 3ph vfd on 1ph.
SMD On Mon, Apr 29, 2013 at 3:18 PM, Cecil Thomas <wctho...@chartertn.net>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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
