西门子6ES7322-5SD00-0AB0

6ES7322-5SD00-0AB0

这是使用一个开关创建两种状态的电路，一种状态是将直流电源的（+）和（-）连接到电机，另一种状态是断开电机与直流电源的（+）或（-）的连接。因其可以通过一个开关实现而被称为“单开关电路”。

当开关导通时，电机根据极性在一个方向上旋转；而当开关关断时，电压消失，电机空转后停止。开关的位置可以在①的（-）侧，也可以在③的（+）侧。也可以用半导体功率晶体管（图中的MOSFET）代替开关来构成电子电路。如②所示设置在（-）侧时，使用Nch MOSFET；如④所示设置在（+）侧时，使用Pch MOSFET。

使用功率晶体管时有一些注意要点。在该电路中，在开关刚刚OFF后，电机的电感量即试图使电流继续保持流动，因此在①中，电机（-）侧的电压达到电源电压以上；在③中，电机（+）侧的电压达到GND以下。该电压超过电源电压的几倍。因此，在使用功率晶体管时，需要按照②和④电路图所示，将功率二极管与电机并联连接，并通过用二极管的正向电压抑制（钳制）产生的电压来保护晶体管。

当有该钳位二极管时，在电机产生的电压高于二极管正向电压期间内，电机产生的电流将流过该二极管，因此转矩的作用方向与旋转方向相反，成为短路制动动作，电机快速停止。

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