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.
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