On Wed, 2007-10-31 at 20:15 -0600, Jon Elson wrote: > 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. > No, these motors are NOT universal motors. You could rectify > the mains to drive the motor, but then it would draw 40 A from > the line. You should be able to find an SCR drive for this. > You can't parallel dimmers, they can't be trusted to give the > same pulse width.
I was joking about the dimmers. So far I have found this: http://www.baldor.com/products/detail.asp?1=1&page=1&catalogonly=1&catalog=BC155&product=DC+Controls&family=One+Way%7Cvw%5FDCControls%5FOneWay&voltage=180 but this puts out 180V and I need 90V. Plus it seems that this kind of controller does not interface with a computer well at all. It's beginning to look like DC lathe spindle drives are a specialty item, which means, hard to find and big bucks to buy or repair. > If it is a standard-frame motor, then you > could go the 3-phase and VFD route. That may not give you the > range of speeds and torque required. The newer VFD's are much better with this aren't they? > If you want smooth, > controlled reversing, then you need a DC servo drive. If you > don't need a complete 4-quadrant servo drive, then the SCR DC > motor drives may be the way to go. Baldor and plenty of others > make these, they show up on eBay all the time. > > Jon ------------------------------------------------------------------------- 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
