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高功率密度永磁同步电机永磁体涡流损耗分布规律及其影响

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Keywords: 3D有限元,永磁体涡流损耗分布,涡流密度线,永磁体局部最热点

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Abstract:

永磁体涡流损耗是高功率密度永磁同步电机热退磁的主要原因之一,对永磁同步电机安全、可靠运行非常重要。本文结合理论分析,使用三维有限元法对永磁体涡流损耗的产生因素及分布特性进行分析。运用涡流密度线的概念及模型,使得永磁体涡流损耗的分布更易于理解。通过将得到的永磁体涡流损耗分块平均分布数据和永磁体涡流损耗整块平均分布数据分别代入三维温度场中进行计算,并与温升实验数据进行对比分析,证明了本文得到的永磁体涡流损耗分布对准确计算永磁体局部温升最热点非常重要。为了适用于工程计算,研究了永磁体涡流损耗各个方向的分布特点对温升分布的影响,并总结出快速、简单且较为准确的永磁体局部最热点计算方法。

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