I光电测量转速系统的设计摘要本文介绍的是采用光电作为转速传感器,借助于最新的控制系统数字信号处理器TMS320LF2407及一定的测速算法——变M/T法,实现了对转速高精度测量的目的。在测速系统中,重点以718转台为实验对象,在控制系统速度环开环的情况下,用光电编码器,借助于最新的控制系统数字信号处理器TMS320LF2407及一定的测速算法——变M/T法,实现了对转台转速高精度测量的目的,为进一步实现伺服系统的全数字化打下了坚实的基础。本文的主要的研究工作如下:首先,在综合分析了影响模拟量和数字量测速的基础上,对基于数字脉冲计数的测速方法进行了全面的研究。对最终确定用变M/T法在TMS320LF2407上实现对电机低速转速测量的实验方案,提供了理论依据,也为进一步提高测速精度和扩展测速范围提供了有利的保障。其次以TMS320LF2407与CPLD为核心构成了测速系统,并完成了用变M/T法实现对电机低速转速的测量。关键词:DSP,低转速,TMS320LF2407,光电编码器,变M/T法,转速传感器IITHEDESIGNOFPHOTOELECTRICMEASUREMENTSPEEDABSTRACTThisarticledescribestheopticalencoderasaspeedsensor,bymeansofthecontrolsystemdigitalsignalprocessorTMS320LF2407speedalgorithm-VariableM/Tmethod,toachievehigh-precisionmeasurementoflowspeedandlowangularvelocityofthepurposeof.Lnthespeed—measuringsystem,takingthe718gimbalsmodelasanobject,inThecircumstanceofopen1oopcontrolsystem,thispaperusetheencodertorealizehighlyaccuratemeasuresforthespeedofmotorbymeansofthelatestdigitalSignalprocessor(DSP)TMS320LF2407,andasomearithmetic—themethodsofalterableM/T.Thisestablishesafirmbasementforthefurtherrealizationofatotaldigitalizedmethodinservosystem?Themainresearchcontentsareasfollows:First,Influencingfactorsofanalogueanddigitalspeed—measuringarediscussedindetail,themethodsofmeasuringspeedbasedondigitalpulsecountingarecomprehensivelystudied,whichprovidetheoreticbasesforestablishingexperimentalprojectusedthemethodsofalterableM/Tandpositiondifferencetorealizelowspeedmeasuringformotor,andprovidepowerfulguaranteeforfurtherimprovingtheprecisionofspeed—measuringandextendingtherangeofspeed—measuring。Secondly,tachosystemismainlymadeupofTMS320LF2407andCPLD,lowspeed—measuringformotoriscompletedbythemethodofalterableM/T.KEYWORDS:DSP,lowrotationalspeed,TMS320LF2407,photoelectricencodertheMethodofAlterableM/T,revolutionspeedtransducerIII目录前言..................................................1第一章测速算法的问题..................................2§1.1测速算法实现中的几个问题......................2§1.1.1定点运算与定标..........................2§1.1.2有限字长效应............................2§1.1.3上溢与下溢处理..........................2§1.1.4软件结构设计............................2第二章光电测速的意义及现状............................4§2.1测速系统研究的目的和意义......................4§2.2测量系统的现状................................4第三章国内外的一些研究方法............................6§3.1光电断续器测量转速............................6§3.1.1转轴转速的测量电路及工作原理............6§3.1.2齿轮转速的测量原理......................6§3.2红外光电测速..................................8§3.2.1测量原理................................8§3.2.2信号处理系统............................9§3.2.3单片机信号处理系统.....................10第四章数字测速.......................................12§4.2DSP简介.....................................12§4.3TMS320LF2407--增强型数字电机专用芯片.........13§4.4TMS320LF2407上用变M/T法实现对编码器测速的硬件设计......................