摘要：随着微电子技术和计算机技术的快速发展，各种类型的微控制器、数字信号处理器、以及其它嵌入式处理器在电动机保护领域得到了广泛的应用，加快了传统行业的优化级，各行业电动机的使用量不断增加，电动机的安全问题越来越引起人们的关注。以MSP430单片机为核心控制器设计了电动机保护单元，并配以液晶显示器等外围设备构成电动机保护系统。该保护装置具有较强的逻辑分析与处理功能，可实现性能完善且复杂的保护方式，还有故障记录与故障分析功能。本装置可以针对断相故障，接地故障，堵转故障，过载故障，短路故障给予及时的判断并作出快速的响应。本设计集合了电机综合保护器的基本保护功能，采用性价比高的微控制器，在硬件电路稳定的基础上以性价比为重点考虑研究，力求兼顾市场的购买力；软件上做了比较完整的保护功能，能满足在实际使用中的保护需求。71474

毕业论文关键字：电机保护，单片机，故障诊断

Abstract:With the rapid development of microelectronics technology and computer technology, various types of microcontroller, digital signal processor, and other embedded microprocessor has been widely used in the field of motor protection,speed up the optimization and upgrading of traditional industries and industries of motor usage increases, the safety of the motor is becoming more and more aroused people's concern.With MSP430 single chip microcomputer as the core controller design for motor protection unit, and liquid crystal displays and other peripherals motorprotection system.The protection device has strong logic analysis and processing functions, which can realize perfect in performance and complex ways of protection and fault recording and analysis functions.This device can open phase fault, ground fault, fault, locked rotor overload fault, fault timely judgment and make a quick response.This design set the basic protection function of comprehensive protector, electric motor using cost-effective micro controller, on the basis of the hardware circuit stability research, focusing on the ratio of strive to balance the purchasing power of the market;Software made a relatively complete protection functions, can satisfy the need of protection in the actual use.

Keywords: motor protection, microcontroller, fault diagnosis

目录

1 引言 4

1.1 电动机保护器的发展历史及现状 4

1.2 课题要求 4

1.3 本课题的研究方法 5

1.4 课题设计的目的 5

2 电动机保护原理 5

2.1 异步电动机运行原理 5

2.2 电动机故障分析 6

2.3 电动机保护原理分析 7

2.3.1 过流保护 8

2.3.2 负序电流保护 9

2.3.3 零序电流保护 9

2.3.4 电压保护 9

2.3.5 过热保护 10

3 系统设计 10

3.1 系统方案的设计 10

3.2 主要器件的介绍 10

3.2.1 MSP430简介 10

3.2.2 LCD12864简介 11

3.3 各个模块的设计方案 12

3.3.1 主电路设计