@hrklg01
Would be interesting, worst case, how many % this Back-EMF can exceed the input the Mysphere was feed?
This could help to find out if an amplifier can handle the extra current/power requiered to drive the Mysphere without clipping.
E.g., how much short circuit current the Mysphere is able to generate when drive is reversed at Myspheres maximum mechanical velocity?
Due to Mysphere's internal resistance there must be a certain limit.
My estimate: the current flow could be doubled at max, related to what could be expected on a purely resistive load.
2nd important question for amplifier stability, what's the max. voltage/current phase angle under such circumstance?