To reduce the electromagnetic force harmonics of the claw pole alternator for weakening vibration and noise,the influences of rotor structure on main force harmonics are analyzed using analytic method.First,an electromagnetic analytic model of claw pole alternator is established taking rotor structural parameters into account,and the accuracy of the analytic model is validated by finite element method.Then the effects of pole tip and pole root on main force harmonics inducing vibration and noise are discussed.Results indicate that,as the variation range of pole tip and pole root is within the limit of 15％,the power generating performance is hardly affected,and suitable pole tip and root values can be selected to reduce the electromagnetic force harmonics.The maximum vibration acceleration of the improved alternator is reduces by 20％,and the overall noise decreased by 2.3 dB(A).%为了削弱爪极发电机的电磁力谐波以降低振动噪声,利用解析方法分析了爪极转子结构参数对主要电磁力谐波的影响.首先,建立了考虑转子结构参数的电磁力解析模型,并通过有限元计算验证了解析模型的准确性;其次,分析了极尖和极根宽度对引起电磁振动噪声的主要电磁力谐波的影响规律;最后,对发电机振动噪声进行了削弱.研究结果表明:当极尖和极根宽度的变化范围控制在15％以内时,对发电性能的影响较小,且选取适当的极尖和极根宽度值能够有效降低电磁力谐波幅值;对转子结构进行改进后,发电机表面的径向振动峰值下降了20％,总声功率级(A)下降了2.3 dB.
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