永磁开关磁链直线电机若干优化设计方法

Some Optimal Design Methods for Permanent Magnet Flux Switching Linear Machines

永磁开关磁链直线电机除具有常规永磁直线电机的优点外,还具有显著的成本优势,因此具有很好的应用前景。本文在简要说明该类电机的基本结构与原理之后,指出通过合理调整初级与次级铁心的外形尺寸来减小反电动势谐波含量与电机推力波动,采用磁桥结构提高弱磁控制能力和初级铁心机械强度,借鉴旋转电机齿槽力矩的抑制方法来削弱推力波动的齿槽效应成分,并提出辅助齿结构来有效削弱推力波动的端部效应成分,最后还给出了一种模块化结构形式来提高电机的容错性以及边端线圈与内部线圈的对称性。

Permanent magnet flux switching linear machines（PMFSLM） have the advantages of conventional PM linear machines, and more importantly, they possess the unique merit of low cost. Therefore, they have gained great application potentials. In this paper, basic structure and operation principle of the PMFSLM are briefly described, and optimization of dimensional parameters of the primary and secondary cores is recommended to reduce the back EMF harmonics and the thrust force ripple, whilst magnetic bridge is utilized to enhance the field weakening capability and the primary core ruggedness. Furthermore, techniques of suppressing the cogging torque in rotary machines are employed to reduce the cogging effect component in the thrust force ripple of PMFSLM, and assistant teeth configuration is proposed to effectively reduce the end effect component in the thrust force ripple. Finally, a modular structure is presented to enhance the fault tolerance as well as the symmetry between the end coils and the inner coils of the primary.