鞍山科技大学本科生毕业设计（论文） 第 III 页
目录
摘要 ......................................................................I
ABSTRACT .................................................................II
1 绪论 ....................................................................1
1.1 选题的背景 .....................................................................................................................1
1.2 PLC 和变频器的发展......................................................................................................1
1.3 系统综述 .........................................................................................................................2
2 三相异步电动机 ..........................................................4
2.1 异步电动机的旋转原理 .................................................................................................4
2.2 异步电动机的电磁转矩 .................................................................................................4
2.3 异步电动机的机械特性 .................................................................................................5
3 变频器的恒转矩控制 ......................................................6
3.1 变频器的工作原理 .........................................................................................................6
3.2 转矩控制时的运行特点 .................................................................................................6
3.3 转矩给定信号与电动机转矩 .........................................................................................6
4 STEP7-300 简介..........................................................8
4.1 PLC 的定义 .....................................................................................................................8
4.2 STEP7-300 软件...............................................................................................................8
5 分布式外围设备现场总线（PROFIBUS-DP） ...................................9
5.1 PROFIBUS-DP 简介.......................................................................................................9
5.2 PROFIBUS-DP 的物理连接...........................................................................................9
5.3 PROFIBUS-DP 的报文结构...........................................................................................9
6 系统的实现 .............................................................11
6.1 系统的硬件连接 ...........................................................................................................11
6.2 MICROMASTER 440 标准型变频器设置 ..................................................................11
