So i was doing some research into motor control for AC drive circuits. I figured I had all the knowledge i needed for the control section. Apparently there are big gains to be had by making it complicated instead of easy. Funny that.
So i was planning on using a control type called "constant volts/hz". So at rated frequency (60hz) you apply rated voltage (208/phase), and you scale it up/down according to speed. Apparently this is not very good and the latest and greatest is called Field Oriented Control.
Here is a paper about some different control types. I think you need to be an engineer or some other kind of geek to understand this, though:
http://www.ab.com/drives/techpapers/PWMDrives01.pdf