Application of Sliding Mdoe Control in Magnetic Levitation Table

• Main Authors: Lu Te-Wei, 盧德偉
• Other Authors: Tung Pi-Cheng
• Format: Others
• Language: en_US
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/98960934378239037652

碩士 === 國立中央大學 === 機械工程研究所 === 87 === This thesis applies sliding mode control (SMC) of variable structure control (VSC) theory into no-contact magnetic levitation (Maglev) table. Due to the developments of the electromagnetic fabrication technology recently, Maglev system has many applications, likes magnetic bearing, magnetic locator, magnetic trains in Germany and Japan, and Maglev table. Maglev takes advantages of controlling the coil current to change the magnetic force of permanent magnets and using it to reach the purpose of levitating something in the air, the control strategy of the magnetic system determines the performance of the Maglev system. From electromagnetism, the magnetic force is squarely proportional to current and squarely inversely proportional to gap between the electromagnetic and rail, and we need state feedback control to let Maglev system closed-loop stable. Conventionally, the popular control method is proportional-integral-derivative (PID) controller. The PID controller applied to a Maglev system is only valid in local region, but not in the global region, and is not robust to uncertainties. In this thesis, SMC theory is applied to design robust controller to control a Maglev table.