Abstract
Thus far, we have reported that it is possible to suppress elastic vibration of the steel plate in the vertical direction by aligning several permanent magnets parallel to the electromagnets that are installed for positioning the magnetically levitated steel plates in the horizontal direction. With the change in distance between the permanent magnet and the edge of the steel plate and the distance between permanent magnets, the attractive force applied to the steel plate by the permanent magnets changes. Due to such uncertainties arising in modeling, the performance of steel-plate positioning by the electromagnet deteriorates. In this study, we design a robust horizontal positioning control system for magnetic levitation of a steel plate using μ-synthesis in which the above uncertainties are taken into consideration.
