新型模块化永磁偏置磁轴承结构设计与磁场分析

Structural Design and Magnetic Field Analysis of New Modular Permanent Magnet Biased Magnetic Bearings

针对永磁偏置磁轴承设计困难和加工繁琐的问题,设计了一种新型模块化永磁偏置磁轴承,通过等效磁路法对其进行磁路分析,采用ANSYS Maxwell对该磁轴承的气隙磁通密度及电流刚度进行仿真模拟,验证结构设计的合理性;同时,引入模块化设计思想,通过多个磁轴承模块的不同组合方式(并行组合使支承力叠加或以夹角方式组合构成合力)以满足对不同位移方式和多种支承力工况下的稳定磁悬浮支承。结果表明,当模块化永磁偏置磁轴承控制绕组中的电流达到最大值3 A时,单个模块支承力达到最大值(约500 N),可满足实际应用需求。

Aimed at the problems of difficult design and complicated processing,new modular permanent magnet biased magnetic bearings are designed.The magnetic circuit is analyzed by equivalent magnetic circuit method.The air gap magnetic flux density and current stiffness of the bearings are simulated by ANSYS Maxwell to verify the rationality of structural design.At the same time,the modular design idea is introduced,and the different combinations of multiple magnetic bearing modules(parallel combination makes the supporting force superimposed or combined into a resultant force by angle)are used to meet the stable magnetic suspension support for different displacement modes and multiple supporting force conditions.The results show that when the current in control winding of the bearings reaches the maximum value of 3 A,the supporting force of single module reaches the maximum value(about 500 N),meeting the practical application requirements.