Just saw your last post. You may want to check with automation direct they have sensored vector drives but I don’t know if the size you need will operate on single phase. If it does you would likely need to go with a larger vector drive to fit your needs. Also you could compare it to buying a servo motor and drive package from a AliExpress vendor I’m certain I’ve seen them in the 7.5 to 10hp range with 15,000rpm Complete package for around $2,000usd. I suspect any good parts you’ve taken off should fetch enough to offset the cost of your build.