AC Servo Motors???

The dumpster at work has quite a few AC Servo motors in it this
week. Are there any cheap (Gecko price range) ways to use these
things, or do you need the matched $$$ drive unit? The motors
are Yaskawa (sp?) and other brands. I didn't write down all the
data, but several were labeled 29 kg-cm continuous, which works
out to about 400 oz-in. I imagine peak torque is quite a bit
higher. The motors are significantly bigger than NEMA 34
steppers. About 4-5" square by 6-8" long. They have attached
encoders. Some of them are labeled as absolute encoders. I
have reason to believe they work fine, they're simply longer
needed. The trash-picker in me hates to see them go out.
But if I can't use them, or find someone else who can, then
they really are junk. They are too bulky/heavy to haul home
on a whim.

John Kasunich