磁悬浮轴承开关功率放大器等效数学模型  

Equivalent Mathematical Models of Switching Power Amplifier for Magnetic Bearing

作　　者：王军[1] 徐龙祥[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《电工技术学报》2010年第4期53-58,64,共7页Transactions of China Electrotechnical Society

基　　金：国家863高技术基金(2006AA05Z205);国家自然科学基金(50437010);江苏省"六大人才高峰"(07-D-013)资助项目

摘　　要：磁悬浮轴承功率放大器是开关型系统,需要从理论上准确地分析开关功率放大器实际特性以指导电路的设计。在三电平脉宽调制功率放大器输出负载电流原理的基础上,运用傅里叶级数理论分析建立了磁悬浮轴承开关功率放大器闭环系统的数学模型并推导出输出负载电流的数学解析式。对该数学模型及数学解析式进行仿真研究,并将仿真结果与Orcad电路软件仿真结果及实验结果相比较,三种结果基本吻合,表明研究的数学模型及解析式是可行有效的。设计的磁悬浮轴承三电平功率放大器使高速磁悬浮电动机在60000r/min的转速下稳定运行。Power amplifier of magnetic bearing is a switching system. In order to design a circuit, it is necessary to accurately analyze the actual characteristics of switching power amplifier. Based on the three-level PWM operating principle of output load current, mathematical models of switching power amplifier are deduced and the equations of output load current are derived by using the Fourier series theory. The simulations of mathematical models and equations are implemented. Three kinds of results are basically the same by comparing the model simulation results with the Orcad circuit simulation results and experimental results. All of results show that the model is feasible and effective. The high speed magnetic suspension motor which uses these designed three-level power amplifiers runs successfully at 60 000r/min.

关 键 词：磁悬浮轴承 数学模型 开关功率放大器 三电平 

分 类 号：TN722.7[电子电信—电路与系统]