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EHB用无刷直流电机齿槽转矩抑制方法研究
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Research on Cogging Torque Suppression Method of Brushless DC Motor for EHB
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    摘要:

    由于齿槽结构的影响,无刷直流电机(brushless direct current motor ,BLDCM)中存 在齿槽转矩,会导致转矩脉动增加,从而影响无刷直流电机的性能 . 为此,以电子液压制动系 统(Electro-hydraulic brake system,EHB)用BLDCM为研究对象,对结构参数进行分析及改进, 来抑制 BLDCM 的齿槽转矩 . 首先,通过对齿槽转矩表达式进行推导和分析,发现其数值由基 本结构参数以及傅里叶分解系数 Br(nz/2p)和 Gn所决定;其次,分别推导了偏心距、极弧系数和辅 助槽与傅里叶分解系数的关系式,进而得到三者与齿槽转矩的变化关系;最后,通过有限元方 法研究了偏心距改变、极弧系数变更和辅助槽添加三种情况下齿槽转矩的变化情况 .结果表 明:当偏心距、极弧系数和辅助槽形状分别为7.90 mm、0.74、椭圆形时,对应的齿槽转矩峰值分 别降低96.65%、90.48%、86.74%,齿槽转矩都得到明显抑制.

    Abstract:

    Due to the influence of the cogging structure,there will be cogging torque in the brushless direct cur? rent motor(BLDCM),which will increase the torque ripple and therefore affect the performance of BLDCM. To solve the above problems,BLDCM used in the Electro-hydraulic brake system(EHB)is taken as the research ob? ject,and the structure parameters are analyzed and improved to suppress BLDCM′s cogging torque. Firstly,by deriv? ing and analyzing the expression of cogging torque,it is found that its value is determined by basic structural param? eters and Fourier decomposition coefficients Br(nz/2p) and Gn Secondly,the function expressions of eccentricity,pole arc coefficient,auxiliary slot and Fourier decomposition coefficient are deduced respectively,and the relationship between them and cogging torque is obtained. Finally,the change of cogging torque is studied by finite element method under three conditions:the change of eccentricity,the change of polar arc coefficient and the addition of aux? iliary slot. The results show that when the eccentricity,polar arc coefficient and auxiliary slot shape are 7.90 mm, 0.74 and ellipse respectively,the corresponding peak cogging torque is reduced by 96.65%,90.48% and 86.74% re? spectively,and the cogging torque is obviously suppressed.

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刘金刚 ,郑剑云 ?,张聪悦 ,傅兵 ,王高升 ,肖绍熙. EHB用无刷直流电机齿槽转矩抑制方法研究[J].湖南大学学报:自然科学版,2022,49(2):38~46

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  • 在线发布日期: 2022-03-04
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