目 录
第 1 章 绪论 ...................................................................................................................................1
1.1 电动机保护器研究的背景及意义 ...................................................................................1
1.2 电动机保护器的历史和现状 ...........................................................................................1
1.2.1 以熔断器、热继电器为主的机械式保护方式 .....................................................1
1.2.2 普通电子式电动机保护器 .....................................................................................2
1.2.3 智能型电动机保护器 .............................................................................................2
1.3 微处理器的发展特点 .......................................................................................................3
1.4 电动机保护器设计的主要工作和论文的各章节安排 ...................................................3
第 2 章 电动机保护原理 ...............................................................................................................4
2.1 异步电动机的运行原理 ...................................................................................................4
2.2 电动机故障分类 ...............................................................................................................4
2.3 电动机保护原理分析 .......................................................................................................5
2.4 电动机故障特征分析及保护判据 ...................................................................................6
2.4.1 短路故障特征分析及保护判据 .............................................................................6
2.4.2 堵转故障特征分析及保护判据 .............................................................................7
2.4.3 断相故障特征分析及保护判据 .............................................................................7
2.4.4 过载故障特征分析及保护判据 .............................................................................8
2.4.5 欠压和过压故障特征分析及保护判据 ...............................................................11
第 3 章 电动机保护器硬件电路设计 .........................................................................................14
3.1 概述 .................................................................................................................................14
3.1.1 电动机保护器硬件系统的技术要求 ...................................................................14
3.1.2 保护装置硬件设计综述 .......................................................................................14
3.1.3 各模块研究 ...........................................................................................................15
3.2 中央处理模块 .................................................................................................................15
3.2.1 STC90C58AD 单片机的主要特点........................................................................15
3.2.2 处理模块电路设计 ...............................................................................................16
3.3 键盘、显示模块 .............................................................................................................16
3.3.1 键盘设计 ...............................................................................................................16
3.3.2 显示设计 ...............................................................................................................17
3.4 电源模块 .........................................................................................................................19
3.5 数据采集模块 .................................................................................................................20
3.6 报警和保护动作执行模块 .............................................................................................21
3.7 通信模块 .........................................................................................................................22
3.8 本章小结 .........................................................................................................................23
