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建立了磁力轴承旋转电磁场的二维有限元模型并进行求解,对不同转速和线圈电流条件下的磁力线分布以及气隙磁通密度进行了分析。结果表明:在NNSS型磁极布置形式中,转子旋转时,涡流场引起磁力线变形,导致一对磁极内的磁力线非对称分布,一极增磁,一极退磁,并在磁极对之间产生较强的磁耦合;当转子旋转时,气隙磁通密度同时受到线圈电流激励的主磁场和转子转速的影响。
The two-dimensional finite element model of the rotating electromagnetic field of the magnetic bearing was established and solved. The distribution of the magnetic flux and the flux density of the air gap under different rotating speeds and coil currents were analyzed. The results show that in the NNSS magnetic pole arrangement, the eddy current field causes the magnetic field lines to deform when the rotor rotates. As a result, the magnetic field lines in a pair of magnetic poles are asymmetrically distributed, one pole is magnetized, one pole is demagnetized, and the magnetic pole pair is stronger When the rotor rotates, the air gap magnetic flux density is affected by both the main magnetic field and the rotor speed excited by the coil current.