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异步电机定子磁场定向弱磁区域最大转矩控制策略研究

DOI: 10.13334/j.0258-8013.pcsee.2015.08.027, PP. 2052-2058

Keywords: 异步电机,定子磁场定向,弱磁控制策略,最大转矩

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Abstract:

针对异步电机定子磁场定向的矢量控制系统在弱磁区域输出最大转矩的问题,提出一种新的磁通前馈的弱磁控制方法。该方法基于异步电机的Г型等效电路和定子磁场定向在弱磁区域运行的限制条件,分析了异步电机在弱磁区域运行时转矩和转差率的变化过程,根据转差率的变化规律将弱磁区域划分为两部分。证明了电机在第一个弱磁区域工作在电压极限和电流极限,在第二个弱磁区域工作在电压极限和转矩极限,同时证明在以上两个区域采用所提出的控制策略时输出的转矩为最大转矩,对应的磁通为最优磁通。实验结果证明了理论分析的正确性和所提出的的磁通前馈方法的有效性。

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