PID control of a zero stiffness magnetic suspension system

Abstract

–As a result of the developments in today's technology, magnetic suspensions have started to beused instead of traditional suspensions (mass-spring-damper) in order to prevent vibrations in structures. Inconventional suspensions, there is an undesirable continuous force transfer from the ground to the useraccording to the action-reaction principle of the existing spring and damper used in the suspension system.Although the mass-spring-damper parameters are well adjusted in a conventional suspension, thistransmitted force transfer cannot be reduced to zero. The main purpose of this study will be a magneticsuspension design to eliminate this undesirable situation. In the designed magnetic suspension, the magneton the linear guide system will be tried to be kept in the zero transmitted force position with the help ofonly magnetic forces without any mechanical contact and lubrication. A total of 3 magnets will be used inthe proposed magnetic suspension system. The magnet on the linear guide will be capable of free slidingand this sliding magnet will be actuated by the rotary magnets standing in a fixed position at ends of thelinear guide system by using the repulsive or pulling forces. The position control of the sliding magnet isachieved by a PID control. Therefore, since no mechanical spring and damper connections will be used inthe proposed suspension system, zero spring force effect could be created.