涡流效应对磁轴承参数设计的影响及优化设计

Influence of eddy effect to the parameter design and optimized design for magnetic bearing

实心结构的转子旋转时,产生的附加磁场(涡流场)会使转子的运动状态显著不同于静止悬浮,可见依赖于静态工作点的磁轴承参数设计精确性不高,因此需要考虑涡流效应对参数设计的影响。利用有限元仿真软件估算了磁轴承设计中的关键参数受涡流效应影响的变化情况,并通过对比气隙磁通密度的实测值与有限元仿真值,验证了所建立有限元模型的正确性。在此基础上还提出了一种优化方案,并通过优化实例的仿真结果验证了该设计方法的合理性和设计结果的正确性。因此,分析涡流效应对交流主动磁轴承参数设计的影响并提出的简单精确的优化方案对采用实心转子的交流主动磁轴承参数设计具有重要的参考价值。

The movement state is significantly different from that of resting and suspended state for the solid rotor under the condition of rotating,due to the large additional magnetic field produced by eddy currents in the rotor.Therefore,the accuracy of parameter design for magnetic bearing based on quiescent point is not high,and the eddy current effect on the parameters of the design must be considered.In this paper,the changes of the key parameters in the parameter design affected by the eddy current effect were estimated,and the simulation results of magnetic flux densities were compared with those obtained from experimental measurements.An agreement was found between the finite element model（FEM） results and experimental observations.On this basis,an optimization scheme was also proposed,and the optimization simulation results with finite element analysis software show that the design method is reasonable and design result is accurate.So this scheme makes the parameters design accurate and close to the actual operation.Therefore,analyzing the influence of eddy effect to the parameter design for a three-phase AC active magnetic bearing and providing accurate and very simple optimization scheme are important references for the parameters design of active magnetic bearing with solid rotor.