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功率放大器作为主动电磁轴承中的关键环节,其控制方式和控制性能对主动电磁轴承的性能有着极大的影响。目前使用较多的是电流控制型功率放大器,但其存在着电流与电磁力的关系依赖材料的电磁特性、负的开环刚度等问题。在分析磁通控制型功率放大器的工作原理和结构的基础上,提出了一种基于磁通观测器的磁通控制型功率放大器。利用磁通控制型功率放大器的状态方程,建立了线性化的数学模型。根据该数学模型,得到了磁通控制型功率放大器的力增益和开环刚度,并与电流控制型功率放大器进行比较分析。在一个单自由度磁悬浮悬梁实验系统上对磁通控制型功率放大器的可行性和理论分析结果进行了验证。
As a key part of active electromagnetic bearing, the control mode and control performance of power amplifier have a great influence on the performance of active electromagnetic bearing. Currently used more current-controlled power amplifier, but the existence of the current and electromagnetic force depends on the material’s electromagnetic properties, negative open-loop stiffness and other issues. Based on the analysis of the working principle and structure of flux-controlled power amplifier, a flux-controlled power amplifier based on flux observer is proposed. Using the state equation of the flux-controlled power amplifier, a linear mathematical model is established. According to the mathematical model, the force gain and open-loop stiffness of the flux-controlled power amplifier are obtained and compared with the current-controlled power amplifier. The feasibility and theoretical analysis of a flux-controlled power amplifier are verified in a single degree of freedom magnetic suspension cantilever experiment system.