Research on Torque Enhancement and Radial Force Reduction of Novel Switched Reluctance Motor with Segmental Stators
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摘要: 开关磁阻电机由于结构简单和启动转矩大等优点应用于许多领域，然而与永磁电机相比，其表现出较低的密度转矩和较大的振动噪声。文中提出一种新型分段定子开关磁阻电机，并在每个定子块两侧增设永磁体，构成分段定子混合励磁开关磁阻电机。首先介绍了拓扑结构和原理，磁路等效法证明了永磁体对气隙磁通加强作用，同时通过有限元仿真得出永磁体对转矩密度的影响并得出优化永磁体厚度。其次建立外转子齿顶开槽模型分析径向力减小的原理，同时对不同槽口宽度和深度模型仿真分析，得到优化尺寸。最后仿真表明，分段定子混合励磁开关磁阻电机的平均转矩提高了34.2%，转矩脉动下降了19.3%，定转子重叠区间的径向力波降低了12.5%，有效降低了径向力，改善了振动噪声。Abstract: Due to advantages of simple structure and large starting torque of switched reluctance motor (SRM), it has been used in many fields. However, SRM shows lower torque density and larger vibration noise compared with permanent magnet(PM) motor. In this paper, a novel segmentation stator SRM is proposed, which had PMs located on both sides of stator block to form segmented stator hybrid excitation SRM (SSHESRM). Firstly, the topology structure and working principle of SSHESRM was introduced, and proven the intensified effect of PMs to air-gap flux density based on magnetic equivalent circuit. Meanwhile, the finite element method was used to analyze impact of PMs on torque density and obtained the optimal thickness of PMs. Then, the model of rectangular slot of ex-rotor teeth was established to analyze principle of reducing the radial electromagnetic force, meanwhile, the optimal size is obtained by FEM to different width and depth. Finally, it is proved that the average torque of SSHESRM is increased by 34.2% and torque ripple is decreased by 19.3% as well as the radial force wave in the overlap area between stator and rotor is reduced by 12.5%, which can effectively reduce radial electromagnetic force and improved vibration and noise.
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图 7 不同永磁体厚度下的平均转矩和转矩脉动
Figure 7. Average torque and torque ripple at different permanent magnet thicknesses
图 8 不同永磁体厚度下的电磁转矩和电感
Figure 8. Electromagnetic torque and electric power at different permanent magnet thicknesses
图 13 不同开槽宽度M和N区间径向力波累加值
Figure 13. Cumulative radial force wave values at different groove widths in the M and N intervals
图 14 不同开槽宽度的平均转矩和转矩脉动
Figure 14. Average torque and torque ripple at different groove widths
图 15 不同开槽深度M和N区间径向力波累加值
Figure 15. Cumulative radial force wave values at different groove depths in the M and N intervals
图 16 不同开槽宽度的平均转矩和转矩脉动
Figure 16. Average torque and torque ripple at different groove widths
图 17 SSHESRM和分段定子SRM的磁共能
Figure 17. Magnetic co-energy of SSHESRM and segmented stator SRM
图 19 M和N区间的径向磁密累加值
Figure 19. Cumulative radial magnetic flux density values in the M and N intervals
表 1 SSHESRM的主要参数
Table 1. Key parameters of SSHESRM
参数 数值 参数 数值 定子外径 142.28 mm 转子外径 172 mm 定子内径 79.28 mm 转子内径 143.48 mm 定子轭厚 6.83 mm 转子轭厚 6.76 mm 定子齿高 24.8 mm 转子齿高 7.51 mm 定子极弧 5.58 mm 转子极弧 5.46 mm 气隙长度 0.6 mm 轴向长度 100 mm 硅钢片材料 DW470 永磁体材料 NdFe30 匝数 55 槽满率 65.4% 
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