One thing I have not seen mentioned yet is the need for the magnet wire in the motor to be "inverter rated". Most modern motors are, but older ones are not. If the wire is not up to the task the insulation on the motor windings will eventually punch through from the switching transients and you will be replacing the motor or having it rewound.
You can find VFDs in smaller sizes up to 2HP that will run a 2HP motor off of single phase. It must say so in the specifications. I have a 2HP drive on my South Bend lathe with a 2HP motor. It worked great until the insulation punched through. I did not know about inverter rated magnet wire at the time. Lathe is WWII vintage. Now it is a boat anchor. Motor is two speed, hi speed is 825RPM. Replacement motors not available. The old man who rewound motors by hand for the oil fields is long dead, so someday will have to take on that project myself. Mean time I have a Taiwan made single phase motor lathe that does what I need.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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