罗克韦尔产品1784-U2CN

1784-U2CN

步进电机的电流的设定需要根据负载的需求的进行确定， 负载越大需要的驱动电流越大 ，但是开环控制的步进电机无法感知负载的大小，往往造成了开环驱动的效率不高。电流细分需要对电流进行控制，需要形成受控电流的闭环，也即是 电流输出为恒流特性 ；另一方面，由于步进电机中的磁阻变化的非线性，需要时刻监控输出电流的大小防止由于铁芯饱和导致电流的失控。如下图3.3，为步进电机驱动芯片TB67S109AFNG对电流控制的波形原理图。Fchop为内部开关周期，通过内部时钟（Internal OSC）分频得到。

具体的恒流控制步骤如下：

1. H桥导通，电流迅速上升至NF，电流上升的斜率为VDC/Ls

2. 到达设定的电流点NF，关断H桥，电流通过续流二极管进行续流，下降的斜率为-VDC/Ls（Fast变化）

3. 当电流到达设定点下线值，控制H桥进行电感线圈短路（一般为下桥），保持电流不变（Slow变化）

4. 当电流的设定点发生变化，H桥通过相同的控制策略控制电流在新的电流设定点保持恒定

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