摘要：对于电磁弹射用直线永磁无刷直流电机，可以通过建立电机电参数的匹配关系和实施合适的控制策略达到提升电机输出性能和提高电机能量转换效率的目的。针对动磁式并联磁路结构，对其电磁场模型进行了理论分析；对动态发射过程中的绕组电流和动子加速度变化以及能量转换效率进行了研究。重点分析了电压、电感、负载质量和换相位置对电流、动子速度和能量转换效率的影响。仿真分析表明，电压、电感、负载质量和换相位置均能影响动态发射性能。对于某一固定结构存在最佳的电压、动子质量和换相位置的匹配，根据动子末速度的不同输出需求，实施相应的提前换相控制方法，能够使得其能量转换效率达到最大。

关键词：直线永磁无刷直流电机；有限元分析；动子末速度；能量转换效率
Abstract: For linear permanent magnet brushless DC motor(LPMBLDCM) used in electromagnetic launching, electrical parameters matching and appropriate control strategies should be applied to improve performance output and enhance energy conversion efficiency. In this paper, a moving-magnet and parallel magnetic structure of LPMBLDCM was analysed and its energy conversion efficiency in launching process was also researched by finite element analysis(FEA). The influence of voltage, inductance, load mass and commutation position on mover final velocity and energy conversion efficiency were studied. Simulation results shows that the voltage, inductance and commutation position have the notable effect on launching characteristic. The optimal parameter matching as well as the advanced commutation method based on mover velocity are need to be applied，which make it possible to achieve the maximum energy conversion efficiency.

Key words: LPMBLDCM; FEA; mover final velocity; energy conversion efficiency