First, I think Karl's answer is too general. While some AC servo drives
may accept induction motors without position feedback, many won't.
Drives specifically set up for permanent magnet motors with commutation
sensors certainly won't work with an induction motor.
Second, I don't think there would be any advantage. What do you expect
to accomplish with this? Position holding like a C axis?
If you think it will make rigid tapping easier, I think i have proven it
won't. Rigid tapping on my Bridgeport and minimill work amazingly well
with no closed-loop spindle speed control at all. The Z axis syncs to
the spindle, and as long as the spindle doesn't stall, it "JUST WORKS".
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