A rotor design of a permanent magnet-type bearingless motor considering demagnetization
A rotor design of a permanent magnet-type bearingless motor considering demagnetization
复制标题
考虑退磁的永磁式无轴承电机转子设计
DOI：
10.1109/pccon.1997.638267
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Fukao
中科院分区：
文献类型：
--
作者：
M. Ooshima;S. Miyazawa;A. Chiba;F. Nakamura;T. Fukao
本文报道了一种表面贴装式永磁无轴承电动机的特性。薄的永磁体用于有效地产生径向力。然而，薄永磁体具有退磁的危机，因为不仅q轴磁通，而且还存在额外的径向力通量在电机磁场中。对于特定的机器配置，已经使用有限元方法明确了由退磁限制的最大q轴和径向力电流。然而，这些结果并没有得到理论上的验证。本文从理论上导出了退磁的极限。发现最大电流作为永磁体厚度的参数。
The characteristics of a surface-mounted permanent magnet-type bearingless motor have reported by the authors. Thin permanent magnets are employed to generate radial forces efficiently. However, thin permanent magnets have a crisis of demagnetization because not only q-axis fluxes but also additional radial force fluxes exist in the motor magnetic field. The maximum q-axis and radial force currents limited by the demagnetization have been already made clear for a particular machine configuration using the finite element method. However, these results are not theoretically verified. In this paper, a limitation of demagnetization is analytically derived. The maximum current is found as a parameter of a permanent magnet thickness.