一种新型三自由度交直流混合磁轴承原理及有限元分析

Principle of a Novel AC-DC Hybrid Magnetic Bearing with 3-degree Freedom and FEM Analyse

研究了一种新颖的永磁偏磁三自由度交直流混合磁轴承。轴向悬浮力控制采用直流驱动,径向悬浮力控制采用三相逆变器提供电流驱动,由一块径向充磁的环形永磁体同时提供轴向、径向偏磁磁通,同时引入一组二片式六极径向轴向双磁极面结构,大幅增大了径向磁极面积,提高磁轴承的径向承载力,并且在保证径向承载力的情况下,减小轴向尺寸。轴承集合了交流驱动、永磁偏置及径向-轴向联合控制等优点。理论分析和有限元仿真证明,磁轴承的结构设计更加合理,对磁悬浮传动系统向大功率、微型化方向发展具有一定意义。

Magnetic bearings have many advantages, such as no friction and abrasions, no lubrication and no sealing, high speed, high precision and long service life, etc, which have innovated the traditional supporting forms fundamentally. In this paper, a novel AC-DC 3 degrees of freedom hybrid mag- netic bearing （HMB） was proposed, which was driven by DC in axial direction and AC provided by a three-phase power converter in both radial directions respectively, and just one common permanent magnet ring provided the axial and radial biased magnetic flux. Besides this, an 2-slice-6-poles axial radial double-magnetic-poles structure for the first time, the available area of the radial magnetic poles could be increased, and the length of the HMB accordingly decreased. It suggested the possibility of high power, micromation and high rotational speed motors.