In order to solve the problems of low magnetic flux density and non-uniformity of magnetic flux density of traditional Lorentz force magnetic bearing (LFMB), a combined magnetic steel single closed magnetic loop magnetic bearing with suction type is designed. Firstly, the magnetic field intensity and magnetic field uniformity of the traditional LFMB are analyzed, and the existing problems of the traditional LFMB are pointed out. Then, a new LFMB structure is designed. The concepts of magnetic field mean value and standard deviation are introduced to describe magnetic field intensity and magnetic field uniformity. By analysis of the 2-D and 3-D magnetic flux characteristics of the proposed LFMB, it can be seen that the magnetic flux density of the new LFMB is 0.67–0.74 T, and the magnetic flux uniformity is 0.009–0.0192. By comparing the conditions of applied current and 0 current, we can see that the structure designed in this paper can reduce the influence of current on the magnetic field uniformity. Finally, by comparing the control effects of the traditional structure and the proposed LFMB structure, it can be concluded that the proposed method can reduce the power consumption and improve the precision of the output torque.

为解决传统洛伦兹力磁轴承（LFMB）磁通密度低、磁通密度不均匀的问题，设计了一种吸力式组合磁钢单闭磁环磁轴承。首先分析了传统LFMB的磁场强度和磁场均匀性，指出了传统LFMB存在的问题。然后，设计了一种新的 LFMB 结构。引入磁场平均值和标准差的概念来描述磁场强度和磁场均匀性。通过对所提出的 LFMB 的 2-D 和 3-D 磁通​​特性的分析，可以看出新 LFMB 的磁通密度为 0.67-0.74 T，磁通均匀度为 0.009-0.0192。通过比较施加电流和零电流的条件，可以看出本文设计的结构可以减少电流对磁场均匀性的影响。最后，通过比较传统结构和所提出的LFMB结构的控制效果，可以得出结论，所提出的方法可以降低功耗并提高输出扭矩的精度。