Control of a Magnetically Levitated Table for Vibration Isolation

This paper experimentally verifies an approach to designing a controller for vibration isolation of a magnetically levitated table. A new subspace-based method for closed-loop system is applied to identifying a state-space model of the system with the measured input/output data. The H¥ theory is used to design a controller based on the state-space model. This controller aims to isolate the table from any disturbance vibrating the base. The designed H ¥ controller achieves better damping performance than that of the PID controller for almost all frequencies.