1 毕业设计（论文）报告 题 目 基于 MM440变频器的交流电机调速控制 摘要 本课题是用可编程序控制器 (PLC)和变频器控制交流电动机工作，由交流电动机带 动流水线工作台运行，其运行转速按一定规律变化，并可在自动运行、单速运行及调整 维护三种状态下进行切换。 Abstract Ac motor is controlled by programmable controller (PLC) and frequency converter in this topic, assembly line is drived by ac motor, its operation speed changes according to certain rules, and can switch in three states, automatic operation, single speed