STUDY OF 2 DOF MAGNETICALLY SUSPENDED MANIPULATION SYSTEM WITH AIR GAP CONTROL

摘要

It is known that a magnetic suspension system canbe made with a permanent magnet and a linear actuator.The linear actuator is used to control theair gap and makes a suspension system stable. Tocontrol supporting forces, system adjusts the air gaplength by permanent magnet movements. Some applicationsusing the suspension system have been developed.This paper describes the rst step of the 2 DOF systemwhich aims the micromanipulation system. Thesuspension system is suitable for micromanipulation,because of no heat generation and little losses of themagnetic circuit. Stability of a 2 DOF magnetic suspensionsystem is studied compared with a 1 DOFsystem. 2 DOF means that the suspension systemcontrols an object in an x??z (vertical) plane. First,the outline of the proposed 2 DOF system is introduced,and modeled. Two models are consideredby the dierence of the inputs of suspension system.The inputs of one model are the positions, and theinputs of the other model are the driving forces forthe magnets. Two models are compared with 1 DOFsystems by numerical simulations.