funny thing i had 3 new ones at one time. Got them from a freind who got them from his work that was just going to trash them. I ended up selling them on ebay for 350 each plus around 80 shipping but they were new in box without controllers. They were permanent magnet dc and build for conveyor belts, as i remember. I remember one guy was going to use it on his lathe :P other two didn't say.
could be a start of a nice generator project
5hp gas motor,windmill,waterwheel,ect, then some transistors and capacitors. There are schematics for dc to ac out there for square wave converters. Would be good for tools other things other then computers and tvs.