直线永磁磁通切换电机推力脉动抑制方法分析

直线永磁磁通切换(LFSPM)电机功率密度高,定子结构简单可靠,在长行程直线牵引场合具有很大的应用潜力。然而很多应用场合在要求直线电机具有高推力密度的同时也能够呈现较低的推力脉动。因此研究推力脉动的产生机理以及抑制方法是提升LFSPM电机应用潜力的重要手段。利用有限元软件对抑制不同成因推力脉动的方法以及这些方法的组合效果进行仿真比较,比较过程中,给出了一种的步进(错齿)位移选择方法,基于该方法,各结构在减小推力脉动的同时可以有效兼顾电机的输出推力平均值。最后对比较结果进行了分析和总结,得出有价值的结论。

Thrust ripple suppression methods for the flux-switching permanent magnetic machine

Linear flux-switching permanent magnet (LFSPM) machines with high power density, having a robust cost-effective stator, shows significant potential in long stroke applications. However, many applications require the linear motors to have high thrust density but also can offer low thrust ripple.Therefore, the research on the issues causing the thrust force ripple and corresponding suppression methods are important means to enhance the application potential of the LFSPM machine. Several general thrust ripple reduction methods are employed and compared to suppress different thrust ripple components of the LFSPM machine. The simulation results are achieved and concluded. In addition, a step displacement selection method is employed during the simulation, based on which the improved LFSPM machines can reduce the thrust ripple by considering the average thrust. Finally, valuable conclusions and analysis are carried out.