On Wed, 2007-10-31 at 21:50 -0500, Ray Henry wrote: > I've got several of these motors out in the garage and I don't think any > of them would handle AC. The ones I've got are real DC motors with > quite a few windings and a massive commutator. > > There were at least two DC motors used in these, rated at 3 hp and 5 hp > nominal. If you look at the drive for these you'll see the ability to > source about 100 amps at 90 volts -- way more than nominal. That is how > they were able to get up to speed, 3000 or 3600 in a couple of > revolutions. > > They also used a large crowbar to kill off deceleration when regenerated > voltage got to about 105 volts. That stopped them in a couple turns > also. > > Rayh > > > On Wed, 2007-10-31 at 14:23 -0700, Kirk Wallace wrote: > > What is the best way to drive a 4hp, 90VDC, 40A spindle motor on a > > Hardinge CHNC? Some of the large DC motors I have seen, look like > > universal motors which would operate on AC or DC. Does anyone know if > > the CHNC spindle motor could work on AC? I'm thinking, a few dimmer > > switches in parallel and a stepper to turn the dials ;). I wonder if it > > would be cheaper to go with a 3-phase motor and VFD. Thanks.
If these are Hardinge parts, could you be persuaded to part with any of these drives or motors? -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
