You can turn down a motor with a AC freq drive if you dial down an 1800 rpm motor to 600 rpm it won't last long. They say don't go below 30% (540 rpms) but I haven't had much luck running them less than 1/2. You may do better if you get an inverter duty motor, some even have a little electric fun that runs independent. ALternative would be to freq drive a 1200 RPM motor 600 would be about 1/2. Not sure if the torque is higher at the lower speeds, if it is that may explain the short motor life at lower speeds. Other alternatives use a 1200 TENC (totally enclosed not cooled)motor, a gearmotor or set it up with a DC motor & drive. I've run them off a little drive with AC in/DC out, the few I've dealt with seemed okay running slow.
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