The Delta units don't look like they would be compatible with what you want to do. There are some drives that are designed to run on a common DC bus.
I would think that motors from the RC hobby world would be a better fit. There are many high HP units available, and at a reasonable cost. I'm involved with one system that uses about a 3 HP BLDC motor that runs on 12 - 24V, about 5000 RPM max. Some of the drone motors are very high HP and are fully controllable just like a servo motor.