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Thrust Ripple Influence of Fractional-Slot Permanent Magnet Linear Motors

机译：分数槽永磁直线电机的推力波动影响

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For permanent magnet linear motor (PMLM), the thrust ripple is bigger compared with the conventional rotary motor, which deteriorates the thrust performance. Based on FEM, the influences of thrust ripple are investigated including slot/pole combination, magnetic load, electric load and end tooth. First, the PMLM topologies with four feasible slot/pole number combinations are introduced and corresponding winding factors are calculated. Then, the thrust ripple is comparatively analysed under different magnetic load and electric load. Finally, the end tooth of motor structure is optimized by the global optimization method to minimize the thrust ripple. It is shown the thrust ripple can be much reduced by adopting asymmetry end tooth structure, and the optimal slot/pole combination is that the difference between pole and slot is two.
机译：对于永磁直线电机（PMLM），推力脉动与常规旋转电机相比更大，这会降低推力性能。基于有限元方法，研究了推力脉动的影响，包括槽/极组合，磁负载，电负载和端齿。首先，介绍了具有四个可行的缝隙/极数组合的PMLM拓扑，并计算了相应的绕组系数。然后，比较分析了不同磁负载和电负载下的推力脉动。最后，通过整体优化方法对电机结构的端齿进行优化，以最大程度地减小推力波动。结果表明，采用非对称端齿结构可以大大减小推力脉动，最佳的槽/极组合是极与槽之差为二。

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