Modeling Dynamic Magnetic Force and Robust Control

The static magnetic force model is very different from the dynamic one in magnetic suspension system. This is because some dynamic factors such as eddy current and mutual inductance disturb the magnetic force. In this paper, an experimental table is firstly established. Then, the static and dynamic magnetic force models are derived and compared. Based on these models, robust controllers of the armature suspension system are developed. It demonstrates that only the controller developed on the basis of dynamic magnetic force can stabilize the system. As a result, we should use the dynamic magnetic force model to develop the controller instead of the static one.