#URTIS-ANUAL
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TO PROVIDE BETTER CONTROL 4HE MATHEMATICAL MODEL OF AN INDUCTION MOTOR
ISCOMPLEX5SINGASERIESOFREFERENCEFRAMETRANSFORMATIONSVECTORCONTROL
SIMPLIlESTHEMODELTOENABLEPRECISECONTROLOFTORQUEANDmUXSIMILARTOA
3EP%XMOTORCONTROLLER
&IGURE ! SHOWS A TYPICAL DIAGRAM OF INDIRECT ROTOR mUX ORIENTATION
4HE INSTANTANEOUS PHASE CURRENTS ARE TRANSFORMED TO THE ROTOR mUX REFER
ENCEFRAMEUSINGROTORSPEEDANDSLIPFREQUENCYWHICHMEANSTHATTHEMO
TORCURRENTSARENOWOBSERVEDFROMTHEVIEWPOINTOFROTATINGWITHTHEROTOR
mUX!SARESULTOFTHISTRANSFORMATIONTHECURRENTSNOWINWHATISCALLEDTHE
DQREFERENCEFRAMELOSETHEIRSINUSOIDALNATUREANDLOOKLIKE$#SIGNALS)NTHE
DQREFERENCEFRAMEQAXISCURRENTCONTROLSTORQUEANDDAXISCURRENTCONTROLS
mUX)FPROPERLYORIENTEDTHETORQUEANDmUXREMAININDEPENDENTOFEACHOTHER
ANDTHEMOTORCANACHIEVEHIGHEFlCIENCYANDDYNAMICRESPONSE
&IG!
$IAGRAMOF
)NDIRECT&IELD/RIENTATION
)&/ TECHNIQUE
4HECONTROLLERUSESANADVANCEDPULSEWIDTHMODULATIONTECHNIQUETO
MAXIMIZE THE UTILIZATION OF BATTERY VOLTAGE MINIMIZE HARMONIC LOSSES AND
INCREASESYSTEMEFlCIENCY4HISMETHODACHIEVESGREATERLINEARUTILIZATION
OFBATTERYVOLTAGETHEREBYEFFECTIVELYGETTINGMOREUSABLEMOTORPOWERTHAN
STANDARD07-ATTHESAMEBATTERYVOLTAGE
0OWER3ECTION
4HEPOWERSECTIONEFlCIENTLYGENERATESHIGHCURRENTPHASE!#SIGNALSFROM
THE$#BATTERYVOLTAGETODRIVETHE!#MOTORASREQUESTEDBYTHEMOTORCON
TROLALGORITHMS
4HE POWER SECTION IS IMPLEMENTED AS THREE HIGH FREQUENCY -/3&%4
HALFBRIDGEPOWERSTAGESCONTROLLEDBYTHREEPULSEWIDTHMODULATORSASSHOWN
IN&IGURE!%ACHHALFBRIDGEPOWERSTAGEISAPARALLELARRAYOFHIGHSIDEAND
LOWSIDEPOWER-/3&%4SMOUNTEDTO)NSULATED-ETAL3UBSTRATE)-3 CIRCUIT
BOARD4HISTECHNOLOGYPROVIDESAVERYLOWTHERMALRESISTANCETOTHEHEATSINK
ANDENABLESHIGHPOWERCAPABILITYINACOMPACTAREA
!00%.$)8!4(%/29/&/0%2!4)/.
!