MODELING AND CONTROLLER DESIGN ON LARGE GAP MAGNETIC SUSPENSION

• Main Authors: CHINQ-JONG SHYU, 徐慶鐘
• Other Authors: CHIN E. LIN
• Format: Others
• Language: en_US
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/99136917419457396454

碩士 === 國立成功大學 === 航空太空工程學系 === 82 === The purposes of this thesis are to model a one-dimension magnetic suspension wind tunnel with dual magnetic poles, upper and lower poles, and to design a controller to achieve the requirements. In the beginning, we derive the magnetic force of the suspension magnetic system to obtain the dynamics equation, then, design a controller to control the states of the suspended object. Finally, we discuss the disturbance induced by the lower pole. In the modeling problem, we derive the magnetic force according to the classic magnetic theory under some assumption. In order to verify the structure of magnetic force, we measure the magnetic flux density by using the Gauss meter and XYZ table and also measure the magnetic force of suspended object by using the electronic weight scale.In the control problem, we introduce balanced current to balance gravitation force, and use feedback linearization technique to linearize the nonlinear dynamic system. Finally, we design a controller on the dual-pole large gap magnetic suspension system. In the tracking problem, the reference signals of step input and sinusoidal input are considered. In order to obtain a better performance, the control structure is modified. In the disturbance problem, the disturbances by attraction mode and repulsion mode are discussed. Finally, the torque generted by the disturbance which is unstable and uncontrollable is also discussed in this thesis.