AB模块1769-L33ER

1769-L33ER

双极连接的方法如图所示，采用电流在一个绕组中双向流动的驱动方式（双极驱动）。这种方式电机的结构比较简单，端子数也较少，但由于控制一个端子的极性，因此驱动电路较为复杂。不过，这种电机的绕组利用率好，并且可以进行的控制，因此可以获得很高的输出转矩。另外，还可以减小在线圈中产生的反电动势，所以可以使用耐压较低的电机驱动器。

■单极连接如图所示，单极连接具有一个中心抽头，采用电流在一个绕组中始终沿固定方向流动的驱动方式（单极驱动）。虽然步进电机的结构较为复杂，但是由于仅需要电流ON/OFF的控制，因此步进电机的驱动电路较简单。不过，其绕组的利用率较差，与双极连接相比只能获得约一半的输出转矩。另外，由于电流ON/OFF时会在线圈中产生很高的反电动势，所以需要使用高耐压的电机驱动器。

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