Quote Originally Posted by Neale View Post
There's a lot of good info here but possibly not so useful to someone without the technical background to follow the discussion!

In short, I think that the answer to the original question is, yes, fixed pulleys with variable-speed motor is a practical proposition, but you need a VFD plus replacement 3-phase motor to do it. You can't make a simple single-phase motor into a variable speed motor just by feeding it from a VFD - unfortunately.
lots of great information surfaced in the thread, appreciate if you can just let me know what would be the problem in using a 1ph VFD?
got my eye on this one http://www.ebay.com/itm/0-75kw-Frequ...16402#shpCntId and seems it would work, am I missing something?

Click image for larger version. 

Name:	IMAG3196.jpg 
Views:	1563 
Size:	187.9 KB 
ID:	18064