摘要
自传感主动电磁轴承不需要独立的位移传感器,相比传统电磁轴承具有成本低、集成度高和结构紧凑等优点,其技术关键在于利用电磁轴承的可测物理量(如线圈电压、电流等)进行转子位置的准确估计。涡流作为电磁轴承中一个重要的非线性因素,会对自传感转子位置估计的精度、线性度产生重要影响。首先考虑了涡流影响下电磁轴承电感相对气隙长度的灵敏度,分析了在自传感电磁轴承中采用叠片结构铁心相比采用实心结构铁心的优势。然后利用一种单匝虚拟绕组模型,分析了叠片结构铁心电磁轴承中涡流对电流纹波特性的影响,并提出了一种考虑了涡流影响的基于电流纹波解调的自传感转子位置估计策略。最后在刚性转子-四自由度径向自传感电磁轴承实验平台上验证了上述自传感位置估计策略的有效性。
The self-sensing active magnetic bearing(SAMB),which doesn’t need independent displacement sensors anymore,owns the benefits of low cost,high integration level and compact structure than the conventional AMB.The key of this technique is to accurately estimate the rotor position from measurable physical variables like coil voltage and current of the MB actuators.Eddy current,as an important nonlinear factor of magnetic bearing,will affect the accuracy and linearity of self-sensing rotor position estimation and even the implementability of self-sensing magnetic bearing.In this paper,we firstly investigate the advantages of using laminated core rather than solid core for the SAMB,through the sensitivity between magnetic bearing inductance and air gap variation under eddy current.Then a single-turn virtual coil model is utilized to analyze the effect of eddy current on the properties of switching ripple currents in laminated core magnetic bearing,so that a self-sensing rotor position estimation method based on switching ripple currents modulation is proposed,with the eddy current considered.Finally,the proposed self-sensing rotor position estimation method is validated on a rigid rotor-four DOF radial SAMB platform.
作者
于洁
祝长生
余忠磊
Yu Jie;Zhu Changsheng;Yu Zhonglei(College of Electrical Engineering,Zhejiang University,Hangzhou 310027 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第9期1946-1956,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金项目(11632015
51477155)
浙江省自然科学基金项目(LZ13E070001)
先进航空发动机协同创新中心项目资助
关键词
自传感
主动电磁轴承
涡流
开关电流纹波
Self-sensing
active magnetic bearing
eddy currents
switching current ripples
