考虑部分通道故障的磁轴承系统动态承载力分析  

Dynamic Capacity Analysis of Active Magnetic Bearing System with Partial Channel Failure

作　　者：刘奇 苏振中[1] 姜豪 吴超 晏明[1] Liu Qi;Su Zhenzhong;Jiang Hao;Wu Chao;Yan Ming(National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering,Wuhan 430033 China)

机构地区：[1]海军工程大学舰船综合电力技术国防科技重点实验室,武汉430033

出　　处：《电工技术学报》2023年第10期2625-2636,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51707201,51690181,51825703)。

摘　　要：通道故障后,磁轴承系统的动态承载力将发生变化,该文建立了考虑部分通道故障的磁轴承系统模型以分析该变化。首先以单自由度模型为例,分析由转子位移及通道电流计算系统动态承载力的方法。其次建立考虑动载荷、转子不平衡量以及故障通道电磁力变化的四自由度系统模型,并将单自由度系统承载力分析方法应用于该系统模型,从而得到四自由度系统动态承载力。然后分析通道故障后控制参数对系统动态承载力的影响。最后进行仿真与实验的对比。结果表明,故障前后转子最大位移幅值误差小于3.9%,验证了所建模型用于计算系统动态承载力的有效性。The dynamic capacity of the active magnetic bearing(AMB)system changes due to its channel failure.The accurate calculation of dynamic capacity is required to determine AMB system operation conditions.However,the AMB system model with partial channel failure in existing studies greatly deviates from reality.In order to improve the model accuracy for calculating the dynamic capacity of the AMB system,considering the external load and initial unbalance mass from the rotor,this paper establishes the four degrees of freedom(DOF)AMB system models with or without channel failure.Based on the system model,dynamic capacity can be calculated with the relations between external load,rotor displacements,and channel current.Firstly,based on the single DOF AMB system model,this paper elaborates on two critical states related to rotor mass:rotor displacement critical state and channel current critical state.Then,the 4-DOF model is established considering external load and initial unbalance mass from the rotor.Secondly,the initial unbalance mass from the rotor is calculated according to the rotor displacement amplitude,which changes by placing various external loads on the rotor.Finally,according to the two critical states,the dynamic capacity of the system with or without partial channel failure is calculated,and the influence of control parameters is analyzed for the AMB system with partial channel failure.By changing the external load value or rotor mass on a single DOF AMB system,we find that the rotor displacement amplitude reaches the critical value(collision value)for the low-mass rotor,and the channel current reaches the critical value(saturation value)for the big-mass rotor.The ratio of rotor displacement amplitude at the stretch side and non-stretch side is related to the load axial position.Therefore,the axial position sign of the load can be determined according to the ratio value.The rotor displacement amplitude can be obtained by substituting the dynamic load into the model,and the error of dynamic load of calculat

关 键 词：磁轴承 动态承载力 不平衡量 通道故障 控制参数 

分 类 号：TM359.9[电气工程—电机]