Bottom magnetic levitation system as a new technology. its technique confines also hard to conquer. levitation rotation speed also is uncontrollable. rotation speek is decided by a lot of factors： control accuracy error, object weight, placed location error, magnet error. Magnetic field error , centre of gravity position and so on.
For example: If you put the object in the middle of the tay . The speed is the Slowest, if not in the centre , The speed will faster, because yawing force resolve to power to drive the object more fast. so the actual products rotation is uncontrollable
Even if it is uncontrollable, Gleagle make it wihtin an acceptable range via ajusting Disc position and control unit.