I'm trying to find a way to run a 3 phase AC servo motor cheaply at a constant speed without feedback (specifically a Yaskawa 300W motor). I happened to buy a motor cheaply and would like to use it as a spindle for a hand held tool I'm making. I initially thought that because it's a 3ph motor, I could run it using a VFD. I have a bunch of VFD's sitting around, so I thought that would fulfill my low cost requirement. Unfortunately it doesn't work - the VFD tries to turn it and then shows an error - over current, I think. I searched here and found others having the same issue. All I need it to do is spin one direction. Speed control would be nice, but not necessary. Does anyone know of any other way to do this?
I've been poking around on ebay for cheap servo drives and reading manuals, but I'm not finding any that I'm confident I could make work. I've also looked at DC motors but didn't really find anything that looked promising. I'm looking for something that turns in the 1500-3000rpm range with around 300W of power and could reasonably be hand held (or maybe supported by a spring loaded tool balancer), so this servo motor seemed to be a decent choice.
Any tips, experience or thoughts appreciated.
John