永磁无刷直流电机换相转矩脉动抑制技术研究

《永磁无刷直流电机换相转矩脉动抑制技术研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、天津大学博士学位论文永磁无刷直流电机换相转矩脉动抑制技术研究姓名：陈炜申请学位级别：博士专业：电机与电器指导教师：夏长亮20060601ABSTRACTPermanentmagnetbrnshlessDC03LDC)motorsareincreasinglybeingusedinindustrialandhouseholdproductsbecauseoftheirhightorquedensity,highefficiency,andlownoise．Inordertoreduceitstorqueripplea

2、ndimproveitsperformance，thedesignoptimization，sensorlesscontrolmethodandcommutationstrategyfortorqueripplesuppressionoftheBLDCmotorarerespectivelystudiedinthisdissertation．Firstly,theinfluenceoftheBLDCmotor’Sstructureparametersoncommutationtorquerippleisstudie

3、d．Usingtheflatwidthoftheback-EMFascriterion，thegapfieldandwindingstructure’Sinfluenceoncommutationtorquerippleisanalyzedquantitatively．Thenichinggeneticalgorithmisadopted，whichCanoptimizemultipleobjectssimultaneously．Andthefuzzylogiccontrollerisintroducedtorea

4、lizetheself-adaptiveregulationofthealgorithm’Sparameterstoenhanceitsconvergentspeedandstability．ThistechniqueisfinallyusedintotheoptimizationdesignofaBLDCmotoLThemotor’seffectivenessisimproved，andthetorquerippleisreducedatthesametime．Secondly,basedonthemathema

5、ticaldefinitionofcommutationtorqueripple，thefunctionofcommutationtorquerippleandcommutationinstantisdeduced，andthepropercommutationinstantsarcprovedtobethezerocrossingsoflineback-EMFs．ThenahovelsensorlesscontrolschemebasedontheKalmanfilteralgorithmispresented．

6、Withthismethod，awiderangeofspeedregulationcanbeobtained，noneutralvoltage，timeshiftedorsilentphaserequired．Consideringthetimeoccupiedbysampling，computingandoperatinginthecontrolprocess，thecorrespondingcompensationisalsoimplicated．Finally,thisdissertationanalyze

7、stheinfluenceoftheback-EMEcurrentcommutationandPWMcontrolonthetorqueripple,anddrawstheconclusionthatbyturningontheactivephaseinadvance，thetorquerippleCanbereducedeffectiveiy．Therelationshipamongtheoptimalturn-oninstankmaximumsofsteadycurrentandback·EMFisconclu

8、ded．Afussylogiccontrollerisalsousedtoobtaintheoptimalturn—oninstantonline，basedofwhich，acommutationstrategyofasensorlessBLDClImotorispresented．Theaccuracyandusefulnessofthisstrateg