Jon Elson wrote: > Ed wrote: > >> >> >>And this dovetails with my thought of reusing the DC spindle motor on my >> CHNC Hardinge. Sam and Jon could this be done and not have to worry >>about a sag in the spindle speed at load? Reuse means not having to buy >>a VFD or change the motor mounts. >> > > I have no idea what the specs on that motor are. Some machines like the > Monarch EE had wound-field motors, > and used field weakening to get a wide range of speeds. So, a system > like that would need TWO drives, a small > one for the field and a heavy one for the armature. You can use a > feedback scheme so that a HAL component > would set up the approximate armature and field PWM duty cycles, and > then continually adjust from there to > maintain constant speed. Especially if you would already have a spindle > encoder, that can be used to feed spindle > speed back to HAL. > > Jon
Looking at the motor and the prints showed nothing about voltage. The amp has a sticker on it about 275V line to line. After some thought I think I will go with the ac motor and vfd as it can give an "at speed" signal to EMC to continue. I am not fond of relying on a pause in the program to wait for the spindle. Ed. ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
