Abstract：The force gain of the proposed flux-controlled power amplifier based on flux observer is studied theoretically and experimentally. First, the structure and principle of flux-controlled power amplifier based on flux observer is introduced briefly, and the mathematical model of force gain is derived by solving the state equation of flux-controlled power amplifier. Then, theoretical analysis, finite element analysis and the actual measurements in an electromagnetic force measurement device is carried on for the force gain, and the results of theoretical analysis, finite element analysis and the actual measurements is compared. By the parameter identification method, the model of the force gain is revised and the relationships between the correction factor and air gap are given when the bias flux are 0.7T and 0.5T. Due to the model of force gain is obtained by linearization near the operating point, so the changes of operating point have a greater effect on the accuracy of the model. Finally, the relationship among the beam position, the force gain theoretical value and the finite element method value is given, when the operating point is set at the midpoint of the air gap.
周丹, 祝长生, 王玎. 电磁轴承用磁通控制型功率放大器力增益的研究[J]. 电工技术学报, 2012, 27(1): 188-195.
Zhou Dan, Zhu Changsheng, Wang Ding. Force Gain of a Flux Control Power Amplifier for Active Magnetic Bearings. Transactions of China Electrotechnical Society, 2012, 27(1): 188-195.
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2012, Vol. 27 
