电机保护器说明总结版-应用文.docVIP

经济型数控机床电动机保护器设计 摘 要 电动机在国民经济中起着举足轻重的作用，电动机能否正常运行直接影响着生产，甚至可使生产中断，故对电动机的保护就非常重要了。本文介绍了一种以微芯公司的单片机dsPIC30F6014为核心的智能电动机综合保护器。本系统主要由电源模块、三相电流取样模块、键盘控制模块、LED显示块、及单片机控制模块组成。通过对三相线电流的实时线性取样,实现对电动机过流、过载、欠流、缺相、三相不平衡、接地/漏电、外部故障等进行保护。同时，本系统还具有强大的控制功能和检测功能。其最大特点是利用微型控制器的存储记忆、逻辑判断和数值运算等强大信息处理功能,克服模拟式继电保护的不足,实现性能稳定、动作速度快、灵敏度高、可靠性好的保护要求和更高的技术指标,提高电动机的工作效率，使其更顺利的工作，更好地服务于生产。 关键词:单片机;三相电动机;保护器 CNC Machine Tool Design Motor Protection Abstract Motor in the national economy play a decisive role, the motor can directly affect the normal operation of the production, and even allows the production interruption, the protection of the motor is very important. This paper introduces a Microchip dsPIC30F6014 microcontroller company at the core of the intelligent motor protector. This system mainly by the power modules, three-phase current sampling module, keyboard control module, LED display pieces, and SCM control module. Through the three-phase line current in real-time sampling of linear, and the electrical flow, overload, less flow, missing phase, three-phase imbalance, grounding / leakage, such as external fault protection. At the same time, this system also has a great control and detection. Its greatest feature is the use of micro-controller of memory, logic and judgement, such as numerical computing power of information processing functions, analog relay to overcome the deficiencies and achieve stable performance, fast action, high sensitivity, reliability and good protection requirements Higher technical indicators, improve the efficiency of motors, the work to make it more successful, better serve the production. Key words: SCM; Three-phase Motors; Protection 目 录 1 绪 论 1 1.1数控机床 1 1.2电动机保护器的概述 1 1.3国内电动机保护器的状况 2 1.4电动机保护器的特点 3 2 工作原理及方案确定 4 2.1基本工作原理 4 2.2系统功能特点 5 2.3方案确定 5 2.3.1单片机的确定 5 2.3.2 三相电流采样回路的确定 7 2.3.3 键盘及显示管的确定 8 3 电动机的常见故障及其保护 10 3.1过载保护 10 3.2过流、欠流保护原理 13 3.3短路保护 13 3.4缺相和相不平衡保护 13 3.5接地保护 14 3.6欠电压保护 14 4 系统的硬件设计 14 4.1三相