I'm not within pickup distance, but I am interested in doing a VFD conversion on both my lathe and mill.
I have been totally unable to find any real numbers on the useful frequency or RPM range a setup like this would give me.
Can you point me to any online resources that would help me specify a motor/drive combo for my lathe?
How much and how quickly does torque fall off when you veer off the 60hz the motor is designed for?
What exactly does 'Inverter Duty' mean? does this give a wider useful speed range?
How about stator cooling? I've seen some installations where the builder grafted a computer muffin fan to the end bell of the motor for better cooling at low speed. I have not seen this specified in any available motor, even those that claim 'inverter rated'.
I know, I ask too many questions... I've heard that many times before.
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Rick Green
