MPL-B540K-MK74AA电机

MPL-B540K-MK74AA

转子包含永磁体，定子包含绕组，这意味着该结构将图 2.1 所示的直流电机中定子和转子的位置颠倒(上一篇)。对于有刷直流电机，一旦电流通过换向器和电刷提供给绕组，电机就开始旋转。当电机旋转时，下一组换向器和电刷通电，从而将电流引导到不同的绕组并继续旋转。 由于无刷电机无需使用电刷或换向器即可实现换向，因此它们需要磁极传感器(霍尔元件、霍尔效应 IC 等)来检测永磁体的磁极位置，以及用于引导电流流过电机的驱动器根据检测到的磁极位置绕组。

为了解释无刷电机的旋转原理，我们将使用图 2.8 中所示的简化三相 2 极模型。

对于转子磁铁，北极和南极的磁极角均为 180°。磁极传感器 Ha、Hb 和 Hc 相隔 120°，它们检测转子磁铁的北极并输出信号。

对于定子，U相线圈、V相线圈和W相线圈间隔120°并且与磁极传感器偏移60°。

对于定子的每个相绕组，当电流从驱动电路流向电机时，在定子的内径侧产生南极。当电流以相反方向流动时，在定子的内径侧产生北极。图 2.8 显示了电流从 U 相流向 V 相时的状态。

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