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1Tothemicrocomputermeasuredthatthefastinstallmentrequest

Tothemicrocomputermeasuredthefastinstallmentthegeneralrequestis:

Resolutionisstrong,theprecisionishigh,asfaraspossibleshortexaminationtime.

1.1resolution

Whencarriesontherotationalspeedexaminationwiththemicrocomputer,theresolutionwithchangeswasmeasuredthattherotationalspeedwhichasurveymeterdigitcorrespondsthechangequantityexpressed.Supposestherotationalspeedwhenbecomen2byn1causesthesurveymetervaluetochangeacharacter,representstheresolutionwithQ:

Theresolutionsizeandsystem'

scontrolprecisionrelationsarereallybig,theQvalueissmaller,resolutionisstronger,system'

scontrolprecisionishigher,itismeasuresthefastinstallmentanimportanttarget.

1.2measuredthatfastprecision

Measuredthefastprecisionisreferstomeasuresthefastinstallmenttotheactualtachometricsurveyprecisedegree.Ifwith△nrepresentstheobservedvalueandtheactualvaluedifference,nrepresentstheactualrotationalspeed,ε%representthemeasuringerrorwhichexpressedwiththerelativevalue,then

Obviously,ε%issmaller,measuredthatthefastprecisionishigher;

system'

scontrolprecisionwillbealsohigher.Themeasuringerrorε%sizesdecidedthatinmeasuredthefastpart'

smanufactureprecision,andwithmeasuredthefastmethodconcerns.

1.3examinationtime

Theexaminationtimeisreferstobetweentwotimerotationalspeedsamplingthetime-gap.Theexaminationtime'

slengththecontrolperformanceinfluenceisverybigtothesystem,iftheexaminationtimeisverylong,thenthesystemwillrealizethestablefastresponsewithdifficulty.Theexaminationtimeisshorter,ismoreadvantageousregardingsystem'

scontrolperformance'

simprovement.

2Themicrocomputermeasuredthatfastgeneralmethod

Bytheelectro-opticaltyperevolvingencoderandelevator'

saxissolidjoint,theelevatorretransmitsthecertainamounteverytime（1080）thesignalimpulse,takesdownthepulsenumberbythecounter,andgivescomputerprocessingtorealizethemicrocomputertomeasurefast.Commonlyusedmeasuredthatthefastmethodmainlyhasthefollowingtwokinds.

2.1TheMlawmeasuresfast

TheMlawmeasuredthatfastisreadsthepulseintegerwhichintheequaltime-gaptherevolvingencodersendsouttofigureouttherotationalspeed.Thepulsenumberwhichsendsoutinthesametimeinternalrotationencoderisdifferent;

theobservedvalueisnotsame.TheMlawmeasuredthatfastschematicdiagramasshowninFigure1.

Bythecounterthepulsecountingwhichtransmitstotherevolvingencoder,timereveryothertimeTsendsoutaninterruptrequesttoCPU,extractscorrespondingaccordingtothecountingvalue'

ssizetherotationalspeed.Therevolvingencoderretransmitspulse1080everytime,altogetherhasmpulseintheTtime,thentherotationalspeedis:

Thiskindmeasuredthatthefastmethodisbythecountingvaluemsizereflectionrotationalspeedheight,thusiscalledtheMlawtomeasurefast.

（1）Resolution

Mayresultinaccordingtotheresolutiondefinitionbytype（3）:

Obviously,theMlawmeasuredfastwhentheresolutionhasnothingtodowiththespeedsize,concernswithrotationalspeedsamplingperiodT.

（2）measuredthatfastprecision

Whenmeasuresusingtherevolvingencoderfast,itsmeasuringerrordecidedthatconcernsinencoder'

smanufactureprecisionandwiththerotationalspeedsize.Supposesbetweentherevolvingencodertwoneighboringpulsestheangulardeviationsare.εp%,anexaminationcycle'

scountingvalueism,thenthemeasuringerroris:

Therotationalspeedislower,missmaller,themeasuringerrorisbigger,measuredthatthefastprecisionislower.AlongwiththeRPMdropmeasuredthatthefastprecisionreducesistheMlawmeasuresafastshortcoming.

（3）Examinesthetime:

IsequaltosurveycycleT.

2.2Tlawmeasuredthatfast

Tlawmeasuredfastisdeterminesbetweentherevolvingencodertwooutputpulsesthetimeintervaltocalculatetherotationalspeedtomeasurethefastmethod.Thetimesurveycarriesonthecountingbyacountertotheknownfrequency'

sclockpulsetoobtain,theTlawmeasuredthatfastschematicdiagramasshowninFigure2.

TherevolvingencoderoutputsapulsethroughthemicrocomputerconnectionsendsoutaninterrupttoCPU,aftertheCPUresponse,toreadoutthecountingvalueeverytimefromthecounter,thenfiguresouttherotationalspeedbythecountingvalue.Supposestheclockrateisf,countingvaluesbetweentwopulse'

sarem,thenrotationalspeednis:

Maysee,theTlawmeasuredthatfastisjusttheoppositewiththeMlaw.Rotationalspeedhighersurveymetervaluemissmaller.

Supposes,becausetherotationalspeedcountingvaluebecomesm-1bym,accordingtoresolutiondefinition:

Bytype（7）,Qvaluesizeandrotationalspeedrelated,therotationalspeedissmaller,misbigger,Qissmaller,measuredthatthefastinstallmentresolutionisstronger.TheTlawmeasuredthatthefastmeritliesinthelowspeedsectiontohavethestrongresolutiontotherotationalspeed,thusmayenhancethelowspeedthecontrolperformance.

（2）Measuresthefastprecision

Measuringerrorisequaltotheangulardeviationsbetweentherevolvingencodertwopulsesεp%,namelymeasuringerror:

Itonlydecidedthatinencoder'

smanufactureprecision,withismeasuredtherotationalspeedtohavenothingtodowith,itcomparedtotheMlawmeasuredthatthefastprecisionmustmiss.

（3）examinesthetime:

Becausetherevolvingencoderretransmits1080pulseseverytime,thereforebetweentwopulse'

stimeintervalsare:

Type（9）indicatedthattheTlawmeasuredthefastexaminationtimechangesalongwiththerotationalspeed.

3Minepitelevatortotachometricsurvey'

srequest

Theminepitelevator'

smovementprocessisaperiodicprocess.Generallyelevator'

spromotioncycleincludingtheacceleration,theconstantspeed,thedeceleration,crawling,stopsfivestages.Infivestages,elevator'

srunningratehastheverywidedifference.BelowgivestheAnhuiProvincesomeoreelevatormovementthespeedchart,seeFigure3.Mayseebythespeedchart,intheaccelerationlegandthedecelerationsectionelevator'

sspeedisoneprocesswhichchangesunceasinglyaccordingtocertainaccelerationortheretardedvelocity,constantspeedDuanYijiaothehighrunningratemovement,thecrawlingsectionspeedrelativesaysmustbemuchslower,onlythen0.4m/s,generallyspeaking,theelevatormovementprocessisaspeedtheprocesswhichchangesunceasinglyinthewiderange,ifwantstorealizethemicrocomputertomeasureaccuratelyfast,thenmeasuredthatthefastmethodmustsatisfyinthehighspeedandcomparesthelowspeedsectiontobeablethecorrectmeasurementrequest.

Inordertosafeguardtheelevatormovementthehighsecurity,inelevator'

seachkindofprotection,hastheconstantspeedsectiontoofastprotectionandthedecelerationsectiontoofastprotection,theconstantspeedsectionrunningratelikesurpasseshighestrotationalspeedVm15%,elevatorsafetyarrestment;

Indecelerationsectionmovement,ifdeterminesthespeedtosurpassgivenvalue10%,alsowillimplementthesafetyarrestment.Therefore,toreflectintheelevatormovementaccuratelythespeedcondition,realizesthecontrolsystemsecurity,reliably,tomovecontinuously,requeststhespeedwhichthemicrocomputerdeterminestobeaccurate,cansatisfycertainprecision.

4TheelevatormeasuredpreciselyfastM/Tlaw

Byabovemayknow,elevator'

svelocitymeasurementrequesthasthehighprecision,canreflectintheelevatormovementaccuratelytheactualrotationalspeed.Thefore-mentionedMlawmeasuresfast,lowspeedDuanCesutheprecisionisquitelow;

TheTlawmeasuresfast,lowspeedsectionrotationalspeedresolutionisstrong,butitmeasuredthatthefastprecisionisalsomuchworsethantheMlaw,theyuseintheelevatormeasuringthefastinsufficientideal;

ButM/Tmeasuredthatthefastprinciplesynthesizestwomethodsthemerits,bothmaythelowspeedsectionreliablesurveyingfast,andalsohasthehighresolutioninthehighspeedsection,adaptedtheelevatortothevelocitymeasurementrequest.TheM/TprinciplemeasuredthatthefastprincipleseesFigure4.

AndT0byatimerfixedtime,examinationcycleThadfinishedafterT0,thepulsegeneratoroutput'

sfirstpulsedecidedthatnamelyT=T0+△T,m1isthepulsenumberwhichintheTtimetheencodersendsout,m2isincyclicalTtotheclockpulsecountingvalue.Therotationalspeedexpressionis:

Aintheformulafclockpulsefrequency;

the108