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1、PermanentmagnetsynchronousmotorWorksSynchronousgeneratorinordertoachievetheenergyconversion,theneedforaDCmagneticfield.Themagneticfieldgenerateddirectcurrent,calledthegeneratorexcitationcurrent.Accordingtotheexcitationcurrentsupplymode,allobtainedfromotherpo
2、wergeneratorexcitationcurrent,knownexcitedgenerators,excitationpowerobtainedfromthegeneratoritself,itiscalledselfexcitedgenerator.Work1,thegeneratorexcitationcurrentinseveralwaystoobtain1)DCgeneratorexcitationmodeThisexcitationmodeofthegeneratorhasadedicated
3、DCgenerator,thisdedicatedDCgeneratorcalledDCexciter,excitergenerallycoaxialwiththegenerator,thegeneratorfieldwindingmountedonalargeshaftthroughslipringsandfixedbrushtogettheDCcurrentfromtheexciter.Thisexcitationmodewiththeexcitationcurrentindependent,workism
4、orereliableandreducingelectricityconsumptionfromtheadvantagesofthepastfewdecadesthemaingeneratorexcitationmode,withamorematureoperatingexperience.Excitationdrawbackisslower,maintenanceworkload,itismorethan10MWunitsrarelyused.2)ACexciterexcitationmodepowersup
5、plySomeofthemodernlarge-capacitygeneratorprovidesACexciterfieldcurrent.ACexcitershaftismountedonthelargegenerator,whichoutputstherectifiedACpowerissuppliedthroughtherotorexcitationgenerator,time,thegeneratorexcitationmodeexcitationmodeareHis,andtheuseofstati
6、onaryfairing,socalledReedforhisstaticexcitation,ACpilotexciterprovidesexcitationcurrent.ACpermanentmagnetpilotexcitermeasuringdevicecanbemachineordevicewithaself-excitationconstantvoltagealternator.Inordertoimprovethespeedexcitationregulator,ACexciterusually
7、100-200HZIFgenerators,whiletheACpilotexciterisused400-500HZIFgenerators.Thegeneratorfieldwindingandthree-phasealternatingcurrentwindingsarewoundinthestatorslots,therotorteethandgroovesonlywithoutwinding,likeagear,sothatitisnobrushes,slipringsandotherrotating
8、parts,withreliable,simplestructureandeasymanufacturingprocess.Drawbackisnoisy,theharmoniccomponentsoftheACpotentialislarge.3)NoexciterexcitationmodeInexcitationmodeisnotsetupspecialexciterandexc