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基于伪周期的Halbach永磁阵列三维磁场端部效应建模研究

, PP. 162-170

Keywords: 平面电机,Halbach永磁阵列,端部效应,机械伪周期,磁场建模

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Abstract:

对于无铁芯动铁式长行程平面电机,其动子Halbach永磁阵列端部磁场的畸变将产生端部效应,由其引起的推力波动将影响平面电机定位与运动精度.建立准确的包含端部磁场的Halbach永磁阵列三维磁场数学解析模型,是电机推力建模,避免推力波动,提高端部磁场利用率及降低单个线圈能耗的基础.以无铁芯动铁式永磁同步平面电机动子Halbach永磁阵列为研究对象,分析了Halbach永磁阵列中磁场类正弦区与端部畸变区的磁场特性,通过将Halbach永磁阵列外边缘磁场衰减至零的特征边界间距定义为机械伪周期,并采用新的傅立叶级数及空间积分技术,推导出了完整的Halbach永磁阵列全空间磁场三维数学解析表达式.通过与有限元计算及现有磁场解析计算方法的对比,结果验证了提出的磁场建模方法的准确有效性.

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