The laser displacement measurement with feedback control in a magnetic levitation and suspension system Original Research Article

In this study, we used a laser displacement sensor, which the resolution was precise over 2 μm and capable of measuring infinitesimal displacement rapidly for magnetic levitation and suspension equipment. A feedback control was applied in this system, which required quick response to voltage variations. We also derived the equations of motion to determine the stability limits and compared our calculations with the experimental results. From the experimental results, this mag-lev system, with special optical sensors and feedback circuits, is able to dynamically adjust unstable levitation positions.