I think it was sending very small current to sense the BEMF to determine rotor position. It would be cool to see a programmer stuff something like a memory that actually remembers where the rotor was at the time it stopped and when you give it throttle, it would be smooth. Every day that goes by, I regret more and more not getting the electronic engineering class (that also included programming) when I had the chance. I've heard from many places that makes ESC that a HV controller would need to have sensors to accurately know where the rotor is at all times and this is where I hope and wish Aveox makes a comeback. It was one of only a handful of companies that had big 5mm shafted 4 pole sensored motors.