毕业设计电动机测速及显

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1、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31目录1概述····································

2、·························31.1本课题设计的目的和意义··········································31.2数字式转速测量系统的发展背景····································32单片机··························································42.1单片机AT89C51介绍··············································43系统

3、方案提出和论证（传感器的选择）··························83.1方案一霍尔传感器测量方案······································83.2方案二光电传感器···············································94转速测量系统的原理···········································114.1转速测量方法··············································

4、·····114.2转速测量原理··········31·········································125系统硬件设计··················································145.1转速信号采集···················································145.2转速信号处理电路设计···········································165.3最小系统的设计·····

5、············································185.3.1复位电路（图4.8）·············································185.3.2晶振电路·····················································215.3.3最小系统的仿真···············································226显示部分设计·························

6、·························237系统软件设计··················································267.1主程序初始化···················································267.2主程序流程图程序流程图·········································27总结··························································

7、·····2931致谢······························································30参考文献···························································311.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

8、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。 这次设计内容包含知识全面，对传感器测量发电机转速的不同的方法及原理设计有较多介绍，在测量