摘要近年来,随着科技的进步,直流电机较之于交流电机具有很强的优势在很多情况下应用非常广泛,可以在不同情况下满足人们对自动化系统的要求。本系统以STC89C52单片机为核心,通过内部定时器产生PWM波形,控制LN298大功率H桥路驱动直流电机已达到控制转速的目的。通过数码管将速度等级显示出来,此外分别从主控制芯片的选择、显示电路的比较与选择、电机调速控制模块、电源电路与电机驱动电路四个方面进一步确定系统的总体设计方案,最后通过数码管LED显示程序设计以及电机控制子程序完成实验步骤,并在结论部分对系统调试过程中的常见的故障分析和注意事项做出了摘要说明,具有一定的理论和实际意义。。关键词:STC89C52;双向可逆控制系统;PWM调速;ABSTRACTThispaperintroducesthedesignofthesystemhardwareandsoftwaredesign,andthehardwareblockdiagramandsoftwareflowchartandgivessomedescription.AccordingtothehardwareblockdiagramofthefollowingfunctionmodulesofSTC89C52chip,thedesign,theL298fullbridgedriverchip,thepulseprocessing,amplification,outputtocontrolthespeedofmotor.ControloftheL298highpowerHbridgedriveDCmotorhastocontrolthespeedofthe.Throughthedigitaltubedisplayspeedgrade,alsocanthroughthebuttoncontrolmotorstoryofinversion,andthemotorspeedtoaddandsubtract.Thesystemdesignisreasonable,completefunctions,superiorperformance,goodresultsintheactualproduction,easytocontrol,simpleandflexibleconfigurationadvantages.Keywords:STC89C52;MCU;PWMspeedcontrol目录摘要..................................................................IABSTRACT.............................................................II前言.................................................................IV1绪论................................................................11.1课题研究的背景.................................................11.2国内外技术发展的现状..........................................21.3本设计的目标任务...............................................22系统总体方案........................................................32.1主控制芯片的选择..............................................32.2显示电路的比较与选择..........................................32.3电机调速控制模块..............................................32.4电源电路与电机驱动电路........................................43系统硬件方案设计....................................................53.1系统总电路框图设计............................................53.2系统模块电路设计及原理........................................54系统的软件设计.....................................................164.1系统的整体程序流程图.........................................164.2数码管LED显示程序设计.......................................174.3电机控制子程序...............................................185系统调试...........................................................195.1常见的故障分析...............................................195.2系统调试注意事项.............................................19结论.................................................................20参考文献.............................................................21致谢.................................................................22附录一硬件原理图....................................................23附录二程序源代码....................................................24绪论(1)课题研究的背景近些年来,社会在飞速发展,生产力在不断的提高。直流电机的因为应用的范围广,并且可以满足不同情况下人们对电机的各种近乎苛刻的要求,所以直流电机的优...