GE PLC输出模块IC693MDL241RR运行性能： 步进电机的控制为开环控制，启动频率过高或负载过大易丢步或堵转的现象，停止时转速过高易出现过冲现象，交流伺服驱动系统为闭环控制，驱动器可直接对电机编码器反馈信号进行采样，内部构成位置环和速度环，一般不会出现步进电机的丢步或过冲的现象，控制性能更为可靠；
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