【作者】 吴凯锋；

【导师】 谢振宇；

【作者基本信息】 南京航空航天大学 ， 机械设计及理论， 2011， 硕士

【摘要】 一般的主动磁悬浮轴承线圈中的电流由偏置电流和控制电流两部分组成。为了降低磁悬浮轴承的损耗,本文分别设计制作了轴向零偏置电流径向有偏置电流控制器和五自由度零偏置电流控制器,研究了含两种控制器磁悬浮轴承转子系统的动态性能。研究结果表明,与一般磁悬浮轴承转子系统相比,轴向零偏置电流控制方式对系统动态性能没有影响,而径向零偏置电流控制方式显著降低了系统的动态性能。在此基础上,本文设计制作了基于TMS320F2812DSP的变偏置电流控制器的硬件电路,采用C语言编制了变偏置电流PID控制软件,完成了转子的稳定悬浮和高速旋转试验。试验结果表明,当系统越过各阶临界转速时,应采用径向有偏置电流控制方式,而当系统转速远离各阶临界转速时,可采用径向低偏置电流控制方式。这一策略不仅能使系统在整个转速范围内保持良好的动态性能,同时磁悬浮轴承的涡流和磁滞损耗小。更多还原

【Abstract】 Coil current of ordinary Active Magnetic Bearing (AMB) is composed of bias current and control current. To reduce power loss of AMB, two kinds of analog controller are developed in the thesis. One is used in the system with zero bias current in axial degree of freedom and bias current mode in radial degrees of freedom, the other is used in the system with zero bias current modes in five degrees of freedom. Dynamic performances of the system with the two controllers are investigated separately. The results show that, compared with ordinary AMB system, zero bias current mode in axial degree of freedom has less effect on the dynamic performance of the system, while zero bias current mode in radial degrees of freedom degrade the dynamic performance of the system obviously.On the foundation of above research, the digital control hardware based on TMS320F2812 DSP is designed and manufactured for the system, variable bias current PID control program is developed by C and assembly language, and the experiments of suspension and high-speed rotating of the setup are also finished. The results show that bias current mode in radial degrees of freedom should be adopted when the system is operated near the critical speeds so that the system has super performance, while low bias current mode in radial degrees of freedom should be adopted when the system is far from the critical speeds so that the power loss of AMB could be reduced.更多还原