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电动机测速及显示
摘 要
在工程实践中,经常会遇到各种需要测量转速的场合，例如在发动机、电动机、卷扬机、机床主轴等旋转设备的试验、运转和控制中，常需要分时或连续测量和显示其转速及瞬时转速。要测速，首先要解决是采样问题。在使用模技术制作测速表时，常用测速发电机的方法，即将测速发电机的转轴与待测轴相连，测速发电机的电压高低反映了转速的高低。为了能精确地测量转速外,还要保证测量的实时性,要求能测得瞬时转速方法。因此转速的测试具有重要的意义。
关键词：电动机 单片机 传感器
目录
1 概述·····························································3
本课题设计的目的和意义··········································3
数字式转速测量系统的发展背景····································3
2 单片机··························································4
2.1 单片机AT89C51介绍··············································4
3 系统方案提出和论证（传感器的选择）··························8
3.1 方案一 霍尔传感器测量方案······································8
3.2 方案二 光电传感器···············································9
4 转速测量系统的原理···········································11
4.1 转速测量方法···················································11
4.2 转速测量原理···················································12
5 系统硬件设计··················································14
5.1 转速信号采集···················································14
5.2 转速信号处理电路设计···········································16
5.3 最小系统的设计·················································18
5.3.1 复位电路（图4.8）·············································18
5.3.2 晶振电路·····················································21
5.3.3 最小系统的仿真···············································22
6 显示部分设计··················································23
7 系统软件设计··················································26
7.1 主程序初始化···················································26
7.2 主程序流程图程序流程图·········································27
总结·······························································29
致谢······························································30
参考文献···························································31
1.概述
1.1 本设计课题的目的和意义
在工程实践中,经常会遇到各种需要测量转速的场合, 例如在发动机、电动机、卷扬机、机床主轴等旋转设备的试验、运转和控制中,常需要分时或连续测量和显示其转速及瞬时转速。要测速，首先要解决是采样问题。在使用模技术制作测速表时，常用测速发电机的方法，即将测速发电机的转轴与待测轴相连，测速发电机的电压高低反映了转速的高低。为了能精确地测量转速外,还要保证测量的实时性,要求能测得瞬时转速方法。因此转速的
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