摘要
为实现含转子不平衡的磁轴承系统动力学建模与同频电流抑制,分析了同频电流、力和力矩的产生机理,即转子不平衡(含静不平衡和动不平衡)经控制器、功放系统、感应电动势在磁轴承线圈中引起同频电流,进而与电流刚度和位移刚度相互作用产生力和力矩,完成了径向4自由度全主动磁轴承系统的建模。对该模型进行了数学求解和验证,提出了一种基于相移通用陷波反馈控制的同频电流抑制方法,可有效抑制控制器、功放系统和感应电动势产生的同频电流。仿真和实验验证了该方法的有效性,与传统的控制器串联陷波器方法相比,基于相移通用陷波反馈控制的同频电流抑制方法还可减少感应电动势引起的同频电流,同频电流进一步衰减了8.8dB。
In order to realize model development and synchronous current suppression in active magnetic bearing(AMB) systems with rotor imbalance,a comprehensive model of the AMB system is analyzed,and a suppression method of synchronous current is proposed.First,the way synchronous current,force and torque are induced by both the static and dynamic rotor imbalances through the controller,power amplifier system and motion is described in detail.Next,the model of the AMB system in the four radial freedoms is developed,analyzed and solved.Then,a suppression method based on generalized notch feedback block with a phase shift is proposed to attenuate the synchronous current resulting from the controller,power amplifier system and motion induced voltage.Finally,the validity of the AMB system model and the proposed method are verified through simulation and experiments.The proposed suppression method,which can attenuate the synchronous current caused by the motion induced voltage,is superior to the series method of notch filter and the controller,with a further suppression ratio of 8.8 dB.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第6期1057-1064,1169,共8页
Journal of Vibration,Measurement & Diagnosis
基金
博士后科学基金资助项目(2013M540857)
中央高校基本科研业务费专项资金资助项目(BLX2014-2
FRF-TF-14-019A1)
关键词
磁轴承
转子不平衡
建模分析
同频电流抑制
通用陷波反馈
active magnetic bearing
rotor imbalance
model analysis
suppression of synchronous current
generalized notch feedback
