Curtis Instruments 1236 - Motor Characterization and Field Weakening


#URTIS-ANUAL/3 
02/'2!--!",%0!2!-%4%23 &IELD7EAKENING#ONTROLAND-OTOR4YPE0ARAMETERS
-/4/2490%0!2!-%4%2
  !,,/7!",% 
 0!2!-%4%2 2!.'% $%3#2)04)/.
-OTOR4YPE n 4HISPARAMETERREFERENCESAPREDElNEDTABLEOFMOTORPARAMETERSFORMANY
-OTOR?4YPE n !#MOTORS#ONSULTYOURLOCAL#URTISCUSTOMERSUPPORTENGINEERFOR
INFORMATIONONHOWTOSETTHISPARAMETERBASEDONYOURAPPLICATIONAND
MOTOR
&)%,$7%!+%.).'#/.42/,-%.5
  !,,/7!",% 
 0!2!-%4%2 2!.'% $%3#2)04)/.
&7"ASE3PEED nRPM 4HISPARAMETERNEEDSTOBERESETEACHTIMETHE-OTOR4YPEISCHANGED
&7?"ASE?3PEED n ORTHELOWSPEEDCURRENTLIMITISCHANGED&OREXAMPLEIFYOULOWER
$RIVE?#URRENT?,IMITPAGEOR0,?$RIVE?.OMINALPAGEYOU
SHOULDCONSIDERADJUSTINGTHISPARAMETER

4ODETERMINETHECORRECTVALUEPERFORMTHISTUNINGTEST4HETEST
SHOULDBERUNWITHBATTERIESTHATHAVEAREASONABLECHARGE)NEITHER
4ORQUE#ONTROL-ODEOR3PEED#ONTROL-ODESETYOURACCELRATESTOBE
FASTSOTHATYOULLBEACCELERATINGATFULLCURRENTDURINGTHETEST.EXT
SETTHE"ASE3PEEDPARAMETERTOTHEMAXIMUMVALUESOTHATITWILLNOT
INTERFEREWITHTHETESTRESULT&ROMASTOPAPPLYFULLTHROTTLEANDACCELERATE
TOHIGHSPEEDANDTHENSTOP!FTERSTOPPINGNOTETHEVALUEDISPLAYEDIN
-ONITOR
w#ONTROLLERw-OTOR4UNINGw"ASE3PEED#APTUREDANDENTERTHIS
VALUEFORTHE"ASE3PEEDSETTING
 4HETEST
RESTARTSEACHTIMETHEVEHICLECOMESTOASTOPANDTHE
THROTTLEISRELEASEDSOBESURETONOTETHEVALUEBEFOREDRIVINGAWAY
&IELD7EAKENING n $ETERMINESTHEAMOUNTOFHIGHSPEEDPOWERTHECONTROLLERWILLALLOW
&IELD?7EAKENING
 n WHILESTILLMAINTAININGMAXIMUMEFFlCIENCYATTHEALLOWEDPOWER2EDUCING
THISPARAMETEREFFECTIVELYREDUCESCONTROLLERCURRENTATHIGHSPEEDSWHICH
CANREDUCEENERGYCONSUMPTIONANDMOTORHEATINGBUTATTHEEXPENSEOF
REDUCEDAVAILABLETORQUEFROMTHEMOTOR
7EAKENING2ATE n $ETERMINESTHECONTROLLOOPGAINSFORlELDWEAKENING3ETTINGTHERATETOO
&IELD?7EAKENING?2ATE
 n LOWMAYCREATESURGINGINTHEVEHICLEASITACCELERATESATMIDTOHIGH
SPEEDS3ETTINGTHERATETOOHIGHMAYCREATEHIGHFREQUENCYOSCILLATIONS
USUALLYAUDIBLEWHENTHEVEHICLEACCELERATESATMIDTOHIGHSPEEDS
-/4/2#(!2!#4%2):!4)/.4%343-%.5
  !,,/7!",% 
 0!2!-%4%2 2!.'% $%3#2)04)/.
#ONTACTYOUR#URTISCUSTOMERSUPPORTENGINEERIFYOUWILLBERUNNINGTHEMOTOR
CHARACTERIZATIONTESTSYOURSELF3EE)NITIAL3ETUPSTEP(PAGE