电磁发射永磁直线电机的磁极结构拓扑方案与探讨

Discussion of Design Issues and Magnet Pole Topologies for Linear Permanent Magnet Machine for Electromagnetic Launch Application

随着高性能永磁材料的开发,永磁电机被越来越广泛地运用于武器装备领域。然而,高性能永磁体的价格随着轻、重稀土元素所占比例的不断升高,使得永磁体的价格持续攀升。因此,如何在保证磁极结构具有较高的电磁性能的同时减小成本,并达到高性价比的要求就成为一个亟待解决的问题。论文从永磁直线电机的磁极结构拓扑出发,通过设定永磁体利用率和性价比比例两个参数,给出了一种衡量永磁直线电机性价比高低的依据,并提出了几种高性能永磁磁极结构和研发关键点,为未来电磁发射永磁直线电机的开发提供了可靠的设计指导意见。

The permanent magnet brushless machines have been increasingly applied to military and weapon systems with the development of high performance rare-earth permanent magnet materials. However, the high performance magnets also exhibit high cost which depends on the usage of light and heavy rare-earth elements to form the specific magnet. Therefore, the issues of how tO obtain a cost-effective magnet pole design has been attracted a lot of attention. This paper develops a group of magnet poles topologies, together with the coefficient of magnet usage and cost-effective ratio, to form a judgment of most suitable magnet pole construction upon these factors. Meanwhile, three important design issues have been discussed based on design a linear permanent magnet machine for ＂s electromagnetic launch system applications.