基于等效磁路的LIPS-200离子推力器磁场特性

Characteristic of magnetic field for LIPS-200 ion thruster based on equivalent magnetic circuit

以放电室阳极振荡电压和放电损耗的最小化为目标,结合正交试验方法,获得了性能提升后可实现长期稳定工作的LIPS-200离子推力器最佳磁路结构与磁场构型。基于此,运用等效磁路方法,采用有限元离散形式,建立了LIPS-200离子推力器放电室磁场模型,研究了特定空间排布下电磁体的永磁体替代方案。利用放电室磁感应强度测试和整机工作性能对比验证了永磁体替代方案的等效性及分析方法的可行性和计算结果的正确性。结果表明:两种磁场状态下的推力器放电室特征位置磁感应强度相对误差低于5%,且推力器工作敏感参数变化情况符合预期,满足磁路等效目标,达到磁路结构再优化,工作性能再提升的整体目标。

The magnetic circuit structure and magnetic field configuration of LIPS-200 ion thruster capable of working steadily after performance enhancement were obtained to minimize the anode shock voltage and discharge loss by using orthogonal experimental method.Combined with the equivalent magnetic circuit method and the finite element discretization form,the magnetic field model of LIPS-200 ion thruster was established.Then the permanent magnet alternative proposals for electromagnet in specific spatial arrangements were studied.And the equivalence of alternative proposals and the effectiveness and feasibility of the simulation method were validated by comparing with the magnetic induction intensity and working performance.Results showed that the relative error of magnetic induction intensity in key points was less than 5%after magnetic field conversion,and the sensitive parameters changed in line with expectations,the design goal of magnetic circuit structure optimization and performance improvement for LIPS-200 ion thruster was well realized.