Purpose\ud– The purpose of this paper is to investigate the impact of the stator core design for a surface permanent magnet motor (SPMM) on the cogging torque profile. The objective is to show how the cogging torque of this type of motor can be significantly reduced by implementing an original compound technique by skewing stator slots and inserting wedges in the slot openings.\ud\udDesign/methodology/approach\ud– At the beginning generic model of a SPMM is studied. By using FEA, for this idealised assembly, characteristics of cogging and electromagnetic torque are simulated and determined for one period of their change. Afterwards, actual stator design of the original SPMM is described. It is thoroughly investigated and the torque characteristics are compared with the generic ones. While the static torque is slightly decreased, the peak cogging torque is almost doubled and the curve exhibits an uneven profile. The first method for cogging torque reduction is skewing the stator stack. The second technique is to insert wedges of SMC in the slot openings. By using 2D and 2 1/2D numerical experiment cogging curves are calculated and compared. The best results are achieved by combining the two techniques. The comparative analyses of the motor models show the advantages of the proposed novel stator topology.\ud\udFindings\ud– It is presented how the peak cogging torque can be substantially decreased due to changes in the stator topology. The constraint is to keep the same stator lamination. By skewing stator stack for one slot pitch 10° the peak cogging torque is threefold reduced. The SMC wedges in slot opening decrease the peak cogging almost four times. The novel stator topology, a combination of the former ones, leads to peak cogging of respectable 0.182 Nm, which is reduced for 7.45 times.\ud\udOriginality/value\ud– The paper presents an original compound technique for cogging torque reduction, by combining the stator stack skewing and inserting SMC wedges in the slot openings.
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机译：目的\ ud–本文的目的是研究表面永磁电动机（SPMM）的定子铁心设计对齿槽转矩分布的影响。目的是展示如何通过倾斜定子槽并在槽孔中插入楔形来实施原始的复合技术，从而显着降低此类电动机的齿槽转矩。\ ud \ ud设计/方法/方法\ ud–开头研究了SPMM的通用模型。通过使用有限元分析，对于这种理想化的装配，可以模拟并确定齿槽和电磁转矩的特性，以改变它们的变化周期。此后，将描述原始SPMM的实际定子设计。对其进行了深入研究，并将扭矩特性与通用扭矩特性进行了比较。当静态转矩稍微降低时，峰值齿槽转矩几乎增加了一倍，曲线呈现出不均匀的轮廓。降低齿槽转矩的第一种方法是使定子叠片倾斜。第二种技术是在槽孔中插入SMC的楔子。通过使用2D和2 1 / 2D数值实验，对齿槽曲线进行了计算和比较。结合两种技术可获得最佳结果。电动机模型的比较分析显示了所提出的新型定子拓扑的优势。\ ud \ udFindings \ ud–提出了由于定子拓扑的变化如何可以大大降低峰值齿槽转矩。约束是保持相同的定子叠片。通过将定子叠片倾斜一个槽间距10°，可以将峰值齿槽转矩降低三倍。插槽开口中的SMC楔形将峰值齿槽效应降低了近四倍。新颖的定子拓扑结构（前者的组合）导致可观的0.182 Nm的峰齿槽效应，峰值齿槽效应降低了7.45倍。\ ud \ ud原始性/值\ ud–本文提出了一种降低齿槽转矩的原始复合技术，方法是结合定子叠片的偏斜并在槽孔中插入SMC楔块。
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