本文主要讲述了交流异步电动机变频调速系统的多段速应用,主要包括对西门子PLC、MM440变频器的程序设计以及各参数设置.%This paper describes the multi-speed application of frequency conversion and speed regulation system of AC induction motor, including the program design of Siemens PLC and MM440 inverter as well as the parameters setting.
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