Modeling, Control and Experimental Validation of 3-pole 4 DOF Magnetic Bearing

• Main Authors: kai-lun Shen, 沈凱倫
• Other Authors: Shyh-Leh Chen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/40968383566345810176

碩士 === 國立中正大學 === 機械工程所 === 96 === In this paper, axial AMB use the structure of 3-pole magnetic bearings proposed by the literature. Thrust AMB use the structure adopted by the literature. In this paper, we use Newton's Second Law of Motion and Lagrange equation system to derive a mathematical model. Control rule adopted ISMC (integral sliding model control) current control. Through computer simulation we can know that the control rule can stability control the system. I used the existing experimental machine to experiment. The biggest difference between the existing experimental machine and the machine supposed by this paper is the axial thrust AMB in this paper replace by two thrust slider. As we supposed the friction can be compensated by the control rule, we can experiment the experimental verification of AMB part. Using ISMC current controller we could not to achieve stability control. Through the experience of experiment and simulation we can found the cause of failure experimentally. One of the reasons is the deviation caused by the regulation of magnetic force. The second reason is that the deviation of air gap caused by previous collisions during unstable control experiment. Since the abridgement of the structure, we can not do the regulation of air gap. The other reason is the difference structure between the theorem and experiment. The unpredictable friction is the main reason of the failure. Therefore, the future work will design the machine which has the axial AMB as supposed by paper for experimental verification consistent with the theoretical simulation.