Ok, I was watching this motor stator winding machine youtube video and at the end, this weird type of stator winding appeared. It obviously looks like a pancake motor, but, it has an inner set of coils, then an outer set closer to the edge. What in the world is this? It's almost like it is being designed for 2 different RPMs, or torque, or, what kind of VFD would this motor require? This is so off the world to me and unexpected...
https://youtu.be/C6qhP6mO2EM?t=622Can anyone say how this motor would work or be driven?
My guess is a weird 2x2 phase system like a gigantic stepper motor, but, wouldn't part of the drive be less efficient than the other?