Magnetic levitation system by on-off control for teaching tool

点击翻译按钮获取中文摘要

Magnetic levitation system is more attractive teaching tool for school education. However, it is difficult to make such a tool in junior high school and high school education, because the control theory based on state space equation is used usually, and that makes the control system too complexity. To cope with this problem, we present on-off control for magnetic levitation system. Magnet is made by using the bolt of 8x40 as iron core and winding small wire around it. The drain current flowing from field effect transistor to magnet is controlled by the voltage of gate which comes from photo transistor excited by small lamp as measuring the distance of magnet and iron ball. This system is so simple that it is possible to make as a teaching tool for magnetic levitation in every school education.