中文摘要：

采用磁通控制方案的电磁轴承系统中的关键环节是气隙磁通的测量。由于在电磁轴承气隙中安装磁通传感器存在较大的困难，所以很难直接用磁通传感器对气隙磁通进行测量，而采用状态观测器的方法进行磁通观测具有较佳的可行性。结合磁通观测器在电机领域中的研究进展，分析了电压模型和电流模型在电磁轴承中应用时存在的问题，进而分析了组合观测器的优点。由于组合观测器中线圈电阻的变化会对磁通观测产生较大的影响，提出了利用模型参考自适应方法对线圈电阻参数进行在线自整定。利用Matlab中的Simulink建立了仿真模型，并以DSP2812为核心研制了磁通型功率放大器，仿真和实验结果均验证了理论分析的正确性。

英文摘要：

The key point of the magnetic flux control in active magnetic bearings （AMBs） is the acquisition of air-gap flux. For flux sensors are hard to be fixed in air gap, the direct measurement of air-gap flux is not easy to implement in AMB systems. By contrast, flux observers have a better feasibility. Combined with the research of flux observers in electrical motors, the problems of the voltage model and the current model applied to the AMB system were analyzed; then the advantages of the compound flux observer was discussed. For the variation of the coil resistance has a tremendous influence on the flux observation, a resistance self-tuning method based on the model reference adaptive control was proposed. The simulation models were built by Matlab/Simulink, and a power amplifier with DSP2812 at the core was developed based on the flux observer. The results of simulation and the experiment verified the correctness of theoretical analysis.