Rotational Resistance
As can be seen from the graph, as the distance between the magnet faces decreases, a resistance to free spinning builds up in a non linear manner. At about 15mm air gap the disc is quite difficult to move out of alignment. When the disc is stationary and pulled down to decrease the gap on one side and increase on the other, it feels like it is controlled by quite strong metal springs.
When spun by hand, the resistance feels like the disc has increased in weight as the air gap diminishes, and it seems more like a flywheel.
The stability of this arrangement suggests to me that even with another set of circumferential levitation magnets and a greatly increased diameter, that the motor could be driven with very little power input.
The levitational stability is a requirement as the components to motorize the ring have a 1mm air gap. The prototype I intend to build will be fitted with full adjustment of all air gaps.
Unlike my experiments with a single rotated ring, this arrangement feels like it is doing something.