AB产品MVI69-MNETC

MVI69-MNETC

变频器的控制方法非常丰富，同时输出的电压、电流大小受变频器的容量限制。暂且认为变频器的容量足够，通常采用大转矩电流比（MTPA）的控制策略。即当转矩要求时，希望用小的电流满足，因为电流小意味着定子铜耗小；而电流时，希望能输出大的转矩，以尽可能的满足工况需要。仍以模型较简单的隐极电机为例，它的转矩T与电流I之间满足

T=3pψfIsinθ

上式就是表贴式永磁电机的矩角特性公式。式中p为电机的极对数，ψf表示永磁体磁链，θ是电流与转子磁链之间的夹角，称为矩角。

上式表明，要想使电流I产生大的转矩，令转矩角等于90度即可。用凸极电机双反应理论的说法，电流要全部作用在交轴上，即Iq=I，这就是传说中的Id=0控制。

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