The H∞ control applying on electromagnetic suspension height of the beam on numerically controlled machining centre with movable gantry

Aiming at gantry-moving machining centre, a suggestion to suspend large-scale movable component, namely movable bridging beam, has been put forward firstly to realize high accurate orientation without friction in this paper. Then wezed in engineering conveniently and its close-loop system also can be constituted easily. The simulatio designed a H^{∞ robust controller to improve the rigidity of electromagnetic suspension air-gap. This control method can be reali n result shows that this control method has better dynamic and static performance and robustness, and meets the requirement on high accurate rigidity of electromagnetic suspension height.}