Ding Guoping, Zhang Songchao, Cao Hao, Gao Bin, Zhang Biyun
Appl Opt. 2017 Jun 10;56(17):4975-4981. doi: 10.1364/AO.56.004975.
The rotational magnetic field of radial magnetic bearings characterizes remarkable time and spatial nonlinearity due to the eddy current and induced electromagnetic field. It is significant to experimentally obtain the features of the rotational magnetic field of the radial magnetic bearings to validate the theoretical analysis and reveal the discipline of a rotational magnetic field. This paper developed thin-slice fiber Bragg grating-giant magnetostrictive material (FBG-GMM) magnetic sensors to measure air-gap flux density of a radial magnetic bearing with a rotating rotor; a radial magnetic bearing test rig was constructed and the rotational magnetic field with different rotation speed was measured. Moreover, the finite element method (FEM) was used to simulate the rotational magnetic field; the measurement results and FEM results were investigated, and it was concluded that the FBG-GMM sensors were capable of measuring the radial magnetic bearing's air gap flux density with a rotating rotor, and the measurement results showed a certain degree of accuracy.
径向磁轴承的旋转磁场由于涡流和感应电磁场而具有显著的时间和空间非线性。通过实验获得径向磁轴承旋转磁场的特性对于验证理论分析和揭示旋转磁场的规律具有重要意义。本文研制了薄片光纤布拉格光栅-超磁致伸缩材料（FBG-GMM）磁传感器，用于测量带旋转转子的径向磁轴承的气隙磁通密度；搭建了径向磁轴承试验台，测量了不同转速下的旋转磁场。此外，采用有限元方法（FEM）对旋转磁场进行了模拟；对测量结果和有限元方法的结果进行了研究，得出FBG-GMM传感器能够测量带旋转转子的径向磁轴承的气隙磁通密度，且测量结果具有一定的准确性。
