| Summary: | 碩士 === 國立中正大學 === 機械工程所 === 97 === The development of magnetic bearing systems is getting more important now. But its not popular due to the relatively higher costs to traditional bearings. This thesis will take three-pole magnetic bearing system as our model. Compared with the previous eight-pole magnetic bearing system, simply use two power amplifiers, can be appropriate to reduce costs. But the three-pole magnetic bearing system is a nonlinear- system. ISMC controller is designed to solve it. Rotation bearing application will be our focus of this paper, because the effects of eccentric force in the high-speed rotation, the eccentric force, if not controlled, may cause system unstable. So we will design adaptive I & I (Immersion and Invariacne) control law, to control the eccentric force. The main principle is to immerse a higher-order system (with the eccentricity of the three-pole magnetic bearing system) into a lower-order (non-eccentric three-pole magnetic bearing system). We hope to design an appropriate adaptive I&I controller, to cancel the eccentric force of the three-pole magnetic bearing system. It will be the three-pole magnetic bearing system with no eccentric force.
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