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一种增强可靠性的永磁同步电机初始角检测

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Keywords: 面贴式永磁同步电机,初始位置角,电感饱和效应,可靠性

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Abstract:

永磁同步电机初始角检测的准确性是其能否成功起动和起动力矩大小的决定性因素。文章在分析了利用绕组电感饱和效应来检测面贴式永磁同步电机转子初始位置角有效性的基础上,提出电压矢量检测法;并针对传统电压矢量法准确性和可靠性低的问题,提出在处理第二波电压矢量时,利用反方向电感规律增加限制条件,且第二波电压矢量后,增大电压矢量的作用时间以增大电流峰值,从而增强转子增去磁效果和各矢量电流的差异性,共同作用以提高初始角度检测的可靠性。实验结果验证了分析设计的可行性和有效性,表明该检测算法不仅能保证电机转子完全静止,而且大幅度增强了初始位置角检测的可靠性,检测精度从原有的7.5°提高到1.8°,具有较大的工程实用价值。

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