Kirk Wallace wrote: > 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. > > > How close would a golf cart controller be? > In the old days, it was clattering relays, and jumps of 6 V at a time. Some of the newer stuff is at least partly electronic. Probably limited to 36 or 48 V, though.
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