西门子产品6ES7313-6CG04-0AB0

6ES7313-6CG04-0AB0

伺服电机一般为三个环控制，所谓三环就是3个闭环负反馈PID调节系统。

内的PID环就是电流环，此环完全在伺服驱动器内部进行，通过霍尔装置检测驱动器给电机的各相的输出电流，负反馈给电流的设定进行PID调节，从而达到输出电流尽量接近等于设定电流，电流环就是控制电机转矩的，所以在转矩模式下驱动器的运算小，动态响应快。

第2环是速度环，通过检测的电机编码器的信号来进行负反馈PID调节，它的环内PID输出直接就是电流环的设定，所以速度环控制时就包含了速度环和电流环，换句话说任何模式都使用电流环，电流环是控制的根本，在速度和位置控制的同时系统实际也在进行电流（转矩）的控制以达到对速度和位置的相应控制。

第3环是位置环，它是外环，可以在驱动器和电机编码器间构建也可以在外部控制器和电机编码器或终负载间构建，要根据实际情况来定。

由于位置控制环内部输出就是速度环的设定，位置控制模式下系统进行了所有3个环的运算，此时的系统运算量大，动态响应速度也慢。

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