[MPaulHolmes]

OK I think I need one more go at how the resolver works. Let's take the perspective that it is a black box. I have a controller with +5v, ground, and 3 A/D inputs available. The resolver needs a periodic waveform from the controller for it to operate (instead of a +5v power supply)? If I supplied a 10KHz 50% duty square wave, would that suffice for "powering" the resolver? I'm thinking it would be a good idea to first get the controller working with a PMSM motor. While the rotor flux angle is the only difference between PMSM and ACIM, it's a significant step with a number of uncertainties. If I knew the code was good in the PMSM case, I could then focus exclusively on the ACIM rotor flux angle without all the uncertainty of other stuff. There really wouldn't be much to change. For testing, I could deal with 2 sine waves that were 90deg out of phase for computing the angle using the A/D. I would just need those 2 sine waves coming in.