一种组合磁钢叠加磁场洛伦兹力磁轴承设计方法

针对现有洛伦兹力磁轴承功耗较高、工作气隙磁场非均匀性问题，提出一种基于组合磁钢叠加磁场的新型洛伦兹力磁轴承设计方法。首先建立了传统洛伦兹力磁轴承电磁力矩模型，揭示了洛伦兹力磁轴承功耗和控制精度与其磁场性能之间的对应关系。在此基础上，引入了磁场强度均值和磁场均匀度的概念，并以此为依据设计出一种轴向整环充磁磁钢与径向分块充磁磁钢组合工作的新型方案。其中轴向充磁磁钢产生主磁场，保证工作气隙周向均匀性，辅助以径向充磁磁钢，使磁场主要聚集在工作气隙处。相比现有洛伦兹力磁轴承，在相同尺寸约束条件下，新型洛伦兹力磁轴承径向磁场均匀度提升了8.7%，磁场强度提升了51.8%，周向磁场连续性显著提高。仿真结果表明,新型洛伦兹力磁轴承可以有效降低功耗、提升控制精度，研究成果可为研制超高精度磁悬浮惯性机构提供一条新的技术途径。

A Lorentz Force Magnetic Bearing Design Method with Composite Magnetic Steel and Superimposed Magnetic Field

A new type of Lorentz force bearing design method is proposed based on the superposition magnetic field and composite magnetic steel to solve the problem of the high power consumption and non-uniformity of the working air gap in the existing Lorentz force magnetic bearing. Firstly, the electromagnetic torque model of the traditional Lorentz force magnetic bearing is established, and the corresponding relationship between the power consumption and control precision of the Lorentz force magnetic bearing and its magnetic field performance is revealed. On this basis, the concepts of the average magnetic field intensity and magnetic field uniformity are introduced. The new plan is designed to combine the axial magnetizing magnetic steel with radial block magnetizing magnetic steel creatively. To ensure the circumferential homogeneity of the work air gap, the main magnetic field is generated from the axial magnetizing magnetic steel. The magnetic field mainly accumulates in the work air gap with radial block magnetizing magnetic steel. Compared with the existing magnetic bearing, under the condition of the same size constraint, the magnetic field uniformity of a new magnetic Lorentz force bearing increases by 8.7%, and the magnetic field intensity increases by 51.8%, significantly higher circumferential field continuity. The research results can provide a new technical way to develop high precision magnetic levitation actuator.