I would buy a vfd but the motor wiring was chopped off. I don’t think it would be worth fixing it.
is it chopped off outside the motor? Often done by impatient people. But that is no big deal. A smart motor guy can figure out which leads go with which windings. I have VFDs on my lathe and mill and the variable speed feature is really nice. They are available off ebay for dirt cheap. Not hard to wire up.