| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 91 === This thesis studies the design of a magnetic bearing, symmetric type magnetic bearing, and using electromagnetic force to suspend gravity force and support the rotor from the system. The magnetic bearing system possesses non-mechanical contact, zero friction, and miniature characteristics; it presents vibration absorber performance of low noise, high efficiency and high reliability in operation. In this thesis, the design concept and method of the magnetic bearing is discussed. The magnetic force and magnetic field circuits are simulated by using finite element analysis method software, Maxwell 3D Field Simulator by Ansoft®. Moreover, the magnetic bearing system is manufactured for experimental study. The hardware construction, including magnetic bearing mechanism as plant, the voltage-controlled PWM current driver, the PC-based PID feedback controller by LabVIEW®, optical fiber sensors provide positional signals, such as a closed-loop system, is a typical optical-electro-mechanical integration system. Based on the system identification and preliminary test, we could verify the analytical result. Finally, a series of experiment is carried out to verify the original design system feasibility.
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