基于Halbach分布的磁障耦合永磁轨道交通驱动直线电机的推力分析

Thrust Analysis of Magnetic Barrier Coupling Permanent Magnet Rail Transit Drive Linear Motor Based on Halbach Distribution

直线电机驱动的轨道交通系统因具有结构简单、安全经济、节能环保的突出优势,受到了国内外学者的广泛关注。但如何保证直线电机在大气隙、重负载情况下仍然具有较大的推力,成为目前研究的热点。针对这一问题,将4种Halbach永磁体阵列应用在磁障耦合永磁轨道交通驱动直线电机MBCPMRTDLM(magnetic barrier coupling permanent magnet rail transit drive linear motor)中,借助解析法和有限元分析法对比分析4种Halbach永磁体阵列对MBCPMRTDLM推力、推力脉动和损耗的影响。得到的结论是:极间隔每对极6块永磁体连续充磁的Halbach阵列在18/20 MBCPMRTDLM中推力较普通凸极永磁直线电机提高了25.2%,永磁体涡流损耗与铁耗得到减小。该研究结论可进一步为电机的推广应用提供理论基础。

Owing to its simple structure,safety,economy,energy saving and environmental protection,the linear motor-driven rail transit system has attracted the focus of scholars both at home and abroad.Especially,how to ensure the large thrust of the linear motor under large air gaps and heavy load has become a hot research subject.To resolve this problem,four types of Halbach permanent magnet array are applied to a magnetic barrier coupling permanent magnet rail transit drive linear motor(MBCPMRTDLM),and the effects of these arrays on the thrust,thrust pulsation,and loss of the MBCPMRTDLM are compared and analyzed using the analytical and finite element methods.Compared with the ordinary salient pole permanent magnet linear motor,the thrust of the Halbach array of six permanent magnets continuously magnetized for each pair of poles increases by 25.2%in 18/20 MBCPMRTDLM,while the permanent magnet eddy current loss and iron loss are reduced.The findings in this paper can provide a theoretical foundation for the promotion and applications of motors.