Guys, call me stupid, but why can't the OP run his lathe off of that DC spindle motor? All he needs is a rectifier bridge to run it at constant speed.
i On Tue, Mar 8, 2011 at 10:54 AM, Ted Hyde <laser...@gmail.com> wrote: > emc-users-requ...@lists.sourceforge.net wrote: > > Message: 5 > > Date: Mon, 7 Mar 2011 22:03:45 -0800 > > From: "Clint Washburn"<cl...@clintandheidi.com> > > Subject: [Emc-users] Single Phase Lathe spindle motor question > > To: "'Enhanced Machine Controller \(EMC\)'" > > <emc-users@lists.sourceforge.net> > > Message-ID:<00bd01cbdd56$99811290$cc8337b0$@com> > > Content-Type: text/plain; charset="us-ascii" > > > > I am in the process of converting my 1978 Hitachi Seiki CNC lathe to EMC. > > It currently has a 7.5 KW dc motor that used to be powered by FUJI SCR > > drive. My first problem my house does not have 3 phase power. I am > having > > to work around this issue with my whole retrofit. I wish to convert this > to > > a 3 phase AC spindle. What VFD's are people having success with as a > > spindle drive with single phase power? Is it realistic to have a 10 hp 3 > > phase spindle on single phase power? or will I have to go with a spindle > > motor closer to around 7.5hp instead? What is everyone's input on this? > > > > Clint Washburn > > > Clint - I converted my Tsugami lathe (also 7.5Hp DC spindle) over to a > 5hp AC spindle - and for testing was running on single phase 220. My AB > VFD would only get the motor up to about 70% speed (2200rpm) before > going into Bus Undervolt Fault - I was running this directly from the > front panel of the VFD without EMC intervention at the time, so there > should have been little to no regen or accel/decel problems. The spindle > was also under no load (from cutting) - so under a cut scenario, I'd > expect the unit to fault just as soon as the insert entered the cut. The > unit functions just fine under 3phase power, of course. > It may be worthwhile to note that although many VFDs with 3 phase input > are built on a simple bridge-cap system, how they check the line-line > voltage may differ, so going leg R-T instead of R-S (for example) may > get you lucky. Alternatively, you may look at a separate DC supply, and > feed the ?440 into the DC bus input on your VFD....assuming your VFD > supports it. I can do this on my AB, apparently. I recall Rexroth > (Bosch) did this with a lot of their high end servo and spindle drives, > so did Mitsu - one central DC supply, with drives that connected to the > buss, instead of all AC input units. > My instinct based only one one experience says you're going to have a > challenge getting that 10hp spooled up on single phase. > > BTW - where did you get a 208vac 10hp drive? By the time you get higher > than 5hp, most are wanting 380-480 input....or you have to mortgage the > house..... :-) > > Best wishes, > Ted. > > > ------------------------------------------------------------------------------ > What You Don't Know About Data Connectivity CAN Hurt You > This paper provides an overview of data connectivity, details > its effect on application quality, and explores various alternative > solutions. http://p.sf.net/sfu/progress-d2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
