I have some useful expriences with Lm629 and LM628 and their programming and initializing are easy and straightforward. but as I remember it was for controlling Dc motor type not for 3 ph motors!!!!
you can use Mc3phac for controlling 3 phase ac motors from freescale.
check it out!
I have a bunch of assembler code I've written for DSPIC 33f256gp710 and DSPIC30F4011 that controls the LM628. If you're seriously interested, I'll convert to .pdf and post it. Some of the code runs the HCTL1100 motor controller too. I had attempted to upload it yesterday before realizing that .txt files won't upload.