Symbian+OS环境
第3期
赵镜红,等:未知负载和转子电阻的交流感应电机自适应控制
feedbackcontrolofinductionmotorswith
rotor
.551.
output
[4]Kwan
of
C
M,LewisFL,YeungKS.Adaptivecontrol
motors
without
flux
measurements.
uncertain
resistance.IEEETrans.Automatic
induction
Control,1999,44(5):967—983
Automatica,1996,32(6):903—908
AdaptiveControlofInductionMotorswith
UnknownLoadandRotorResistance
ZhaoJinghong
ZhangJunhong
(SchoolofElectricalandInformationEngineering,NavalUniv.of
Engineering,Wuha咒430033)
Abstract
AnobserverbasedadaptivecontrollerisdesignedforvariablespeedthreephaseACinductionmo—
tors.Theproposedcontrollerallowsforsimultaneousandindependentcontrolofthe
speed(torque)andthefluxofthemotorwithoutrequiringthemeasurementoftheflux,andwithouttheknowledgeoftherotorresistanceandthemotorload.Thecontrolleradaptivelyestimatesthefluxvariablesandtheunknownparameters,usingonlythemeasuredspeed,voltageandcurrent
signals.Thecontrol
strategynot
isdesignedfortheequivalenttwophasefieldorientedmodelofthemotor.Therefore,itdoes
havestiffnonlinearitiesand,hence,itissuitableforthediscretizationand
digitalimplementation
withDSPs.
Keywords:inductionmotor;rotorresistance;adaptivecontrol;fluxobserver
‘+____—+斗_—p—¨_-+___—-_H—+_—H-+H—+—¨_Hh+—P__一—+—h++_—H—+H呻H—+—+.+
(上接第539页)
[6]聂伟强,熊剑,严隽.在SymbainOS环境下用活
Is]钮雪莲,凌力.Symbian系统平台安全性分析与改
进.计算机工程,2006,4(32):194—196
动对象处理非抢先式多任务.科技广场。2005(3):84—
85
Research
on
SecurityofUsingtheActiveObjects
to
DealwithNon—-preemptive
LiShun
Multitasking
Wei
ChenShi
inSymbianOS
Chen
(Schoolof
Information
Engineering,W,U丁,Wuhan430070)
Abstract
Thispaperdiscusses
a
specialthoughtwhich
uses
theactiveobjects
to
dealwithnon-preemptive
current
ca-
multitaskinganddiscussesproblemsabouttheplatformsecurityinSymbianOSthatisthe
popularoperationsysteminthemarketofsmartphone.Itinterprets5sectorsofsecurityincluding
pability,permission,authorization,secureidentifieranddataCaging.3basic
concepts
are
analyzed
includingactiveobject,non—preemptivemultitaskingandasynchronousfunction.Analysisiscar“ed
OuttO
theprocessofprocessingfromtheSecurity.Itresolvestheproblemabout
current
OSofsmart
phonefromtWOaspects:alittlememoryandtheplatformSecurity.
Keywords symbianOS;platformsecurity;activeobject;non—preemptivemuhitasking
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