N. Barry et al., LEVITATION OF THE JUMPING RING USING A FUZZY-LOGIC CONTROLLER, International Journal of Electrical Engineering Education, 34(3), 1997, pp. 211-222
Levitation, using the principle of electromagnetic induction and the c
onsequential force between two circuits, is employed to maintain a rin
g stationary above a coil. The a.c. output voltage to the coil is swit
ched through a H bridge inverter with a fuzzy logic controller determi
ning the amplitude level. Analysis is included.