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一种利用转矩观测矫正异步电机转子磁场定向的方法

DOI: 10.13334/j.0258-8013.pcsee.2015.17.028, PP. 4517-4523

Keywords: 异步电机,间接矢量控制,转子时间常数,转矩观测,转差频率矫正

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Abstract:

异步电机矢量控制的性能易受电机参数变化的影响。该文针对转子时间常数变化的情况,提出一种基于转矩观测的磁场定向矫正方法。利用定向控制偏差时转矩在dq坐标系和αβ坐标系上的观测差异,通过PI调节器直接补偿转差角频率。文中还详细分析了由转子时间常数引起dq轴电流的耦合性,及定向偏差对转子磁链、转矩观测的影响。由于该方法直接观测定子磁链,不涉及难以准确辨识的转子电阻参数,因此可以有效地保证矫正的精度。该方法结构简单、易于工程实现。仿真和实验验证了该算法的有效性。

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