摘要
对于实心结构的电磁轴承,线圈中的高频纹波电流会在轴承的定子和转子铁心中感应出较强的涡流,同时由于涡流的集肤效应,在接近材料表面的区域会出现磁饱和现象,这会对电磁轴承线圈中的纹波电流产生影响。该文采用电磁场有限元方法建立推力磁轴承有限元模型,并通过瞬态分析的方法计算磁轴承在工作过程中的涡流及线圈中的纹波电流。结果表明,轴承中的涡流会大大影响线圈纹波电流的波形和幅值,且磁饱和、开关频率和电源电压都对纹波电流有一定影响。最后通过实验验证了分析结果的正确。
Eddy current will be induced within the stator and rotor of the non-laminated magnetic bearings because of the ripple current in the coil when driven by a switched power amplifier. In addition, flux saturation caused by the skin effect of eddy currents appears in regions near the surface of the material. In turn, the ripple current will be influenced by the eddy current and flux saturation. The finite element（FE） model of the active magnetic thrust bearing（AMTB） was proposed and transient analysis was performed to calculate the eddy current and ripple current of the AMTB in working condition. The results indicated that the eddy current would greatly change both the waveform and the amplitude of the ripple current and may be affected by magnetic saturation, switching frequency and voltage of the power supply. Finally, the validity of the calculated results were verified by experiments.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第24期110-114,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(50635060)~~
关键词
纹波
涡流
磁饱和
电源电压
开关频率
ripple
eddy current
magnetic saturation
supply voltage
switching frequency
