DIYbanter - View Single Post

keep in mind that the torque of the motor is pretty well fixed and
at speeds below it's normal rated speed, it may overheat, and may not have
enough
torque to do the job it's requested to do.
this is when the pulleys come into use.
for light duty you CAN run in a high gear and run the motor at a low rpm but
the motor speed times the torque is what determines the real horsepower.
i use VFDs from automationdirect.com for relatively small stuff.
they're cheap and good, and you can run small stuff from single phase mains.
sammm

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"Proctologically Violated©®" wrote in message
...
ergo the distinction between variable speed/stepped pulleys moot (at least
w/ 3 ph motors)?

One thing is for su VFD is lot more expensive than stepped pulleys!