AB产品1769-RTB45

1769-RTB45

在无传感器的情况下，无法掌握停止时永磁体的位置，因此无法知道启动时如何给三个线圈通电。其对策之一，是通过同步运行使永磁体旋转，并检测所产生的感应电压，进行120度通电驱动的方法，下面使用下图进行说明。

①：如果永磁体在①的位置，则本来应该使线圈中流过电流以在6点钟方向产生合成磁场，但由于不知道永磁体的位置，故无论永磁体的位置如何，都在预先确定的位置（图中为5点钟方向）生成合成磁场。

②：如果这种状态保持时间，则永磁体的S（N）极就会被合成磁场的N（S）极吸引，永磁体就会稍微沿顺时针方向移动（旋转）。

③、④：但是，由于这种移动尚不足以产生感应电压，所以接下来使之在7点钟方向产生合成磁场。这样，永磁体将同样沿顺时针方向移动。

⑤、⑥：当继续使之在9点钟方向产生合成磁场时，永磁体进一步顺时针移动并开始旋转。

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