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1、BLDCMotorSpeedEstimationUsingPDCTimerModule1SpeedCalculationofBLDC1.1SummaryofBLDCSincecurrentBLDChassubstitutedtheelectricalcommutatorforthemechanicalone,iteliminatesthedisadvantagesofnoise,spark,electromagneticdisturbance,shortlifetime,etc.NowBLDCisprovidedwithadvantagesofsimplestructure,d
2、ependableoperationandeasymaintenanceasACmotordoes,aswellasadvantagesofhighefficient,noexcitationcostandfunctionalspeedregulationastraditionalDCmotordoes.Soitiswidelyusedinvariousfieldsofindustrialcontrolnow.1.2PDCModuleIntroductionSPMC75F2413Aprovidestwochannelsof16bitPDC(PhaseDetectionContr
3、ol,PDC)timersusedforcapturefunctionandPWMoperation.ItalsosupportspositiondetectionfeaturesforBrushless-DCmotorapplication.ThePDCtimersareverysuitableforbothmechanicalspeedcalculation,withACIandBLDCmotorincluded,andphasecommutationforchangingcurrentconductionaccordingtopositioninformation.Fig
4、ure1-1showstheblockdiagramofentirePDCtimers,channel0andchannel1.FordetailsofPDCtimer’sspecification,pleaserefertoTable1-1.Table1-1PDCTimerFunctionPDCTimer0PDCTimer1ClocksourcesInternalclock:FCK/1,FCK/4,FCK/16,FCK/64,FCK/256,FCK/1024Externalclock:TCLKA,TCLKBInternalclock:FCK/1,FCK/4,FCK/16,FC
5、K/64,FCK/256,FCK/1024Externalclock:TCLKA,TCLKBIOpinsTIO0A,TIO0B,TIO0CTIO1A,TIO1B,TIO1CTimergeneralregisterP_TMR0_TGRA,P_TMR0_TGRB,P_TMR0_TGRCP_TMR1_TGRA,P_TMR1_TGRB,P_TMR1_TGRCTimerbufferregisterP_TMR0_TBRA,P_TMR0_TBRB,P_TMR0_TBRCP_TMR1_TBRA,P_TMR1_TBRB,P_TMR1_TBRCTimerperiodandP_TMR0_TPR,P_
6、TMR1_TPR,17counterregisterP_TMR0_TCNTP_TMR1_TCNTCapturesampleclockInternalclock:FCK/1,FCK/2,FCK/4,FCK/8Internalclock:FCK/1,FCK/2,FCK/4,FCK/8CountingedgeCountonrising,falling,bothedgeCountonrising,falling,bothedgeCounterclearsourceClearedonP_TMR0_TGRA,P_TMR0_TGRB,P_TMR0_TGRCcaptureinput.Clear
7、edonP_POS0_DectDatapositiondetectiondatachanges.ClearedonP_TMR0_TPRcomparematches.ClearedonP_TMR1_TGRA,P_TMR1_TGRB,P_TMR1_TGRCcaptureinput.ClearedonP_POS1_DectDatapositiondetectiondatachanges.ClearedonP_TMR1_TPRcomparematches.InputcapturefunctionYe
