Happy to see that someone is finally getting this concept to the operating stage.
I put this up over three years ago.
I will be getting back into this very soon, as I have finally cleared the decks in my workshop.
While using the unmodified Synergy drive would allow many interesting possibilities, it seems to me that combining of the motors via the welded planetary may be the most efficient way to use the drive.
I have two second gen drives, so I will try it both ways.
The ICE shaft also runs the transmission oil pump, so from a lubrication standpoint, it is better for that shaft to always be turning to fully lube all the internal bearings.
This combined motor system also allows removing all the final drive gearing, to drop over 100 lbs of weight and the use of the ICE input shaft as an output shaft to drive any transmission, thus allowing this to power large vehicles.
The combined motors should be able to push my light weight Insight with no other transmission to well over 80 MPH.
You mention using an analog devices resolver decoder evaluation board for feedback?
What board did you use?