Arvid, I tried it too on a little Omron servo that seems to be a pure AC motor, just three phases with no commutation. At lowest speed, the motor actually turned over, but slowly. As I cranked up the frequency, the servo just grumbled and complained and did not go faster. The servo is a NEMA 23, 200V AC servo. Current seemed constant as I messed with it at 2.5A, which seemed about right. The servo simply didn't work.
I hope you didn't trash that servo! |