Stable Levitation of a Passive Magnetic Bearing
Stable Levitation of a Passive Magnetic Bearing
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DOI：
10.1109/tmag.2012.2209123
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发表时间：
2013
影响因子：
2.1
通讯作者：
K. Bachovchin;J. Hoburg;R. Post
中科院分区：
文献类型：
--
作者：
K. Bachovchin;J. Hoburg;R. Post
介绍了一种能使转子在各个方向上稳定悬浮的被动磁轴承系统的设计。轴承系统由与Halbach阵列稳定器耦合的悬浮磁体组成，该稳定器在稳定线圈中感应电流，以克服仅由永磁体组成的系统的固有不稳定性。悬浮磁体系统由两对环形磁体组成，其提供向上的磁悬浮力以抵消转子的向下重力。Halbach阵列稳定器由两个稳定线圈组成，这两个稳定线圈在角位置上相对于彼此偏移，并且在两个旋转Halbach阵列之间的垂直方向上居中。永磁体的磁场是通过在磁化不连续的表面上的磁化电荷的叠加来计算的。通过计算通过这些线圈的磁通量的时间导数来计算稳定线圈中的感应电流。转子上的磁力使用磁化电荷的每个补丁上的力的叠加来计算。整个磁轴承系统，包括悬浮磁铁和海尔贝克阵列稳定器，是稳定的垂直和横向位移。结果进行了比较，一个简单的拉直近似的Halbach阵列稳定器。
A design for a passive magnetic bearing system that can stably levitate a rotor in all directions is described. The bearing system consists of levitation magnets coupled with a Halbach array stabilizer, which induces currents in stabilization coils, in order to overcome the inherent instability of a system composed only of permanent magnets. The levitation magnet system consists of two pairs of annular ring magnets which provide an upward magnetic levitation force to counteract the downward gravitational force of the rotor. The Halbach array stabilizer consists of two stabilization coils shifted in angular position with respect to one another and centered in the vertical direction between two rotating Halbach arrays. Magnetic fields from permanent magnets are calculated using superposition of fields due to patches of magnetization charge at surfaces where the magnetization is discontinuous. Induced currents in the stabilization coils are calculated by computing the time derivative of the magnetic flux through those coils. Magnetic forces on the rotor are computed using a superposition of forces on each patch of magnetization charge. The entire magnetic bearing system, consisting of both the levitation magnets and the Halbach array stabilizer, is stable to both vertical and lateral displacements. Results are compared with a simpler straightened approximation of the Halbach array stabilizer.