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。
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.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第36期153-161,共9页
Proceedings of the CSEE
基金
国家自然科学基金项目(10772160)
国家863高技术基金项目(2006AA05Z201)
浙江省公益技术应用研究项目(2011C21021)~~
关键词
磁通观测器
电磁轴承
磁通控制
功率放大器
模型参考自适应
flux observer
active magnetic bearings
fluxcontrol
power amplifier
model reference adaptive control
