Peter, I think I accidentally deleted your post about the AC inverter paper. However in my searching I found a really useful motor control handbook by Richard Valentine: http://tinyurl.com/6yujn9 And the whole book is previewable under Google Books. So I have some decent reading material now. Thanks for the suggestion, BAJ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist