Uthini umahluko phakathi kwe-inverter overload kunye ne-overcurrent?Umthwalo ogqithisiweyo ngumbono wexesha, oku kuthetha ukuba umthwalo udlula umthwalo olinganisiweyo ngokuphindaphinda okuthile ngexesha eliqhubekayo.Eyona ngcamango ibalulekileyo yomthwalo ogqithisileyo lixesha eliqhubekayo.Ngokomzekelo, umthamo ogqithisiweyo we-converter frequency yi-160% ngomzuzu omnye, oko kukuthi, akukho ngxaki ukuba umthwalo ufikelela kumaxesha angama-1.6 umthwalo olinganisiweyo ngomzuzu omnye ngokuqhubekayo.Ukuba umthwalo ngequbuliso uba mncinci kwimizuzwana engama-59, ke i-alam yokulayisha ngaphezulu ayizukuqaliswa.Kuphela emva kwemizuzwana ye-60, i-alamu yokulayisha ngaphezulu iya kuqaliswa.I-Overcurrent yingcamango yobuninzi, ebhekisela kumaxesha amaninzi umthwalo odlula ngokukhawuleza umthwalo olinganisiweyo.Ixesha le-overcurrent lifutshane kakhulu, kwaye ukuphindaphinda kukhulu kakhulu, ngokuqhelekileyo ngaphezu kweshumi okanye namaxesha amaninzi.Ngokomzekelo, xa i-motor isebenza, i-shaft mechanical ivalwe ngokukhawuleza, ngoko i-current ye-motor iya kunyuka ngokukhawuleza ngexesha elifutshane, ekhokelela ekungaphumeleli kwe-overcurrent.
Ukugqithiswa kwangoku kunye nomthwalo ogqithisiweyo zezona mpazamo zixhaphakileyo zokuguqula amaza.Ukwahlula ukuba isiguquli sefrikwensi sikhubekile ngoku ngaphezulu okanye ukukhubeka ngokugqithisileyo, kufuneka siqale sicacise umahluko phakathi kwazo.Ngokubanzi, umthwalo ogqithisileyo kufuneka ugqithise ngoku, kodwa kutheni isiguquli sefrikhwensi kufuneka sahlulwe ngaphezulu-kwangoku kumthwalo omninzi?Kukho iiyantlukwano ezimbini eziphambili: (1) izinto ezahlukeneyo zokukhusela I-Overcurrent isetyenziselwa ukukhusela i-frequency converter, ngelixa i-overload isetyenziselwa ukukhusela i-motor.Ngenxa yokuba amandla okuguqula amaza ngamanye amaxesha kufuneka anyuswe ngegiya enye okanye iigiya ezimbini kunomthamo wemoto, kule meko, xa i-motor igcwele kakhulu, isiguquli sefrikhwensi ayinyanzelekanga ukuba sigqithise.Ukukhuselwa komthwalo ogqithisiweyo kwenziwa ngumsebenzi wokukhusela i-electronic thermal ngaphakathi kwi-converter frequency.Xa umsebenzi wokukhusela i-electronic thermal usetiwe kwangaphambili, "umlinganiselo wokusetyenziswa kwangoku" kufuneka usetwe kwangaphambili ngokuchanekileyo, oko kukuthi, ipesenteji yomlinganiselo womlinganiselo wangoku wemoto ukuya kumlinganiselo okhoyo we-converter frequency: IM%=IMN*100. %I/IM Apho, im%-yangoku yosetyenziso umlinganiselo;I-IMN--ilinganiswe ngoku kwimoto, a;IN— ireyithiwe yangoku yeconverter frequency, a.(2) Ireyithi yokutshintsha yangoku yahlukile Ukhuseleko lomthwalo ogqithisiweyo lwenzeka kwinkqubo yokusebenza koomatshini bokuvelisa, kwaye izinga lokutshintsha kwe-di/dt yangoku lidla ngokuba lincinci;Ukugqithiswa ngaphandle komthwalo ogqithisileyo kuhlala ngesiquphe, kwaye isantya sokutshintsha kwe-di/dt yangoku sihlala sisikhulu.(3) Ukukhuselwa komthwalo ogqithisileyo kuneempawu zexesha elichaseneyo.Ukukhuselwa kokugqithiswa ngokugqithisileyo kuthintela i-motor ekutshiseni, ngoko ineempawu "zexesha eliphambeneyo" elifana ne-thermal relay.Oko kukuthi, ukuba alikho ngaphezu kwexesha elilinganiselweyo, ixesha elivumelekileyo lokugijima linokuba lide, kodwa ukuba lingaphezulu, ixesha elivumelekileyo lokugijima liya kufinyezwa.Ukongeza, njengoko i-frequency iyancipha, ukutshatyalaliswa kobushushu bemoto kuba kubi.Ngoko ke, phantsi komthwalo ofanayo we-50%, i-frequency ephantsi, ifutshane ixesha elivumelekileyo lokugijima.
Uhambo olugqithisiweyo lwe-frequency converter Ukugqithiswa kwangoku kwe-inverter kwahlulwe kwi-short-circuit fault, ukukhubeka ngexesha lokusebenza kunye nokukhubeka ngexesha lokukhawuleza kunye nokunciphisa, njl. njl. ngexesha lokusebenza, kodwa ukuba iqalwe kwakhona emva kokusetwa kwakhona, iya kukhubeka kaninzi nje ukuba isantya sinyuka.(b) Inomsinga omkhulu wokushukuma, kodwa uninzi lwabaguquli befrikhwensi bakwazile ukwenza ukhuseleko lokukhubeka ngaphandle komonakalo.Ngenxa yokuba ukhuseleko luhamba ngokukhawuleza, kunzima ukujonga okwangoku.(2) Isigwebo kunye nokusingatha Inyathelo lokuqala kukugweba ukuba kukho isiphaluka esifutshane.Ukuze kuququzelelwe isigwebo, i-voltmeter inokudibaniswa kwicala lokufaka emva kokusetha kwakhona nangaphambi kokuqalisa kwakhona.Xa uqala kwakhona, i-potentiometer iya kujika ngokukhawuleza ukusuka kwi-zero, kwaye ngelo xesha, qaphela i-voltmeter.Ukuba i-frequency ye-output ye-inverter ihambe ngokukhawuleza xa iphakama, kwaye isalathisi se-voltmeter sibonisa iimpawu zokubuyela "ku-0" ngoko nangoko, oko kuthetha ukuba isiphelo sesiphumo se-inverter siye sajikeleza okanye sisekelwe phantsi.Isinyathelo sesibini kukugweba ukuba i-inverter i-short-circuited ngaphakathi okanye ngaphandle.Ngeli xesha, uxhulumaniso ekupheleni kwesiphumo se-converter frequency kufuneka luqhawulwe, kwaye ke i-potentiometer kufuneka iguqulwe ukwandisa i-frequency.Ukuba isahamba, oko kuthetha ukuba isiguquli esijikelezayo sifutshane;Ukuba ayihambi kwakhona, oko kuthetha ukuba kukho isekethe emfutshane ngaphandle kwesiguquli samaza.Jonga umgca ukusuka kwisiguquli samaza ukuya kwimoto kunye nemoto ngokwayo.I-2, umthwalo we-overcurrent load ulula kakhulu, kodwa ukukhubeka ngokugqithisileyo: Le yinto ekhethekileyo yolawulo lwesantya esiguqukayo.Kwimo yokulawula i-V / F, kukho ingxaki evelele kakhulu: ukungazinzi kwe-motor magnetic circuit system ngexesha lokusebenza.Isizathu esisisiseko silele: Xa uqhuba kwi-frequency ephantsi, ukuze uqhube umthwalo onzima, imbuyekezo ye-torque isoloko ifuneka (oko kukuthi, ukuphucula umlinganiselo we-U / f, obizwa ngokuba yi-torque boost).Iqondo lokuzalisa lemotor magnetic circuit itshintsha nomthwalo.Olu hambo lwangoku olubangelwa kukugcwala kwesekethe yemagnethi yemoto kwenzeka ikakhulu kumaza aphantsi kunye nomthwalo olula.Isisombululo: Lungisa umlinganiselo we-U/f ngokuphindaphindiweyo.I-3, i-overload overcurrent: (1) Into ephosakeleyo Abanye oomatshini bokuvelisa ngokukhawuleza banyusa umthwalo ngexesha lokusebenza, okanye "babambekile".Isantya semoto sihla ngokukhawuleza ngenxa yokungashukumi kwebhanti, ukunyuka kwangoku ngokukhawuleza, kwaye ukukhuselwa komthwalo ogqithisiweyo kukude kakhulu ukuba kusebenze, okubangelwa ukuhamba ngokugqithisileyo.(2) Isicombululo (a) Okokuqala, fumanisa ukuba umatshini ngokwawo unengxaki, yaye ukuba unjalo, lungisa umatshini.(b) Ukuba oku kugqithiswa yinto eqhelekileyo kwinkqubo yokuvelisa, okokuqala qwalasela ukuba umlinganiselo wothumelo phakathi kwemoto kunye nomthwalo unokunyuswa?Ukwandisa ngokufanelekileyo umlinganiselo wothumelo kunokunciphisa i-torque yokumelana kwi-motor shaft kwaye uthintele imeko yokungahambi kwebhanti.Ukuba umlinganiselo wothumelo awunakunyuswa, umthamo wemoto kunye ne-frequency converter kufuneka yandiswe.4. Ukugqithisa ngoku ngexesha lokunyuka okanye ukukhawuleza: Oku kubangelwa ukukhawuleza okanye ukukhawuleza, kwaye amanyathelo anokuthi athathwe alandelayo: (1) Yandisa ixesha lokunyusa (ukunciphisa).Okokuqala, qonda ukuba ngaba kuvunyelwe ukwandisa ukukhawuleza okanye ixesha lokunciphisa ngokweemfuno zenkqubo yokuvelisa.Ukuba ivumelekile, inokwandiswa.(2) Ukuqikelela ngokuchanekileyo ukukhawuleza (i-deceleration) yonyango (ukuthintela i-stall) umsebenzi I-inverter inomsebenzi wokuzilungisa (uthintelo lwe-stall) ngokugqithisileyo ngexesha lokukhawuleza kunye nokunciphisa.Xa ukunyuka (ukuwa) kwangoku kudlula umda omiselweyo ophezulu wangoku, ukunyuka (ukuwa) kwesantya kuya kunqunyanyiswa, kwaye emva koko ukunyuka (ukuwa) kuya kuqhubeka xa ihla lehla ngaphantsi kwexabiso elimiselweyo.
Uhambo olugqithisayo lwe-converter frequency I-motor inokujikeleza, kodwa ukusebenza kwangoku kudlula ixabiso elilinganisiweyo, elibizwa ngokuba ngumthwalo ogqithisiweyo.Ukusabela okusisiseko komthwalo ogqithisileyo kukuba nangona i-current idlula ixabiso elilinganisiweyo, ubukhulu bokugqithisa abukho bukhulu, kwaye ngokuqhelekileyo ayenzi impembelelo enkulu yangoku.I-1, esona sizathu somthwalo ogqithisileyo (1) Umthwalo womatshini unzima kakhulu.Eyona nto iphambili yomthwalo ogqithisileyo kukuba i-motor ivelisa ubushushu, obunokufunyanwa ngokufunda ukusebenza ngoku kwiscreen sokubonisa.(2) Amandla ombane angalungelelananga anezigaba ezithathu abangela ukuba umsinga osebenzayo wesigaba esithile ube mkhulu kakhulu, nto leyo ekhokelela ekukhubekeni komthwalo omninzi, obonakala kukufudumeza okungalungelelananga kwemoto, esenokungafumaneki xa kufundwa umsinga obalekayo ovela kwisiboniso. isikrini (kuba isikrini sokubonisa sibonisa kuphela isigaba esinye sangoku).(3) Ukusetyenziswa kakubi, inxalenye yangoku yokufumanisa ngaphakathi kwi-inverter iyahluleka, kwaye isibonakaliso sangoku esifunyenweyo sikhulu kakhulu, okubangelwa ukukhubeka.2. Indlela yokuhlola (1) Khangela ukuba i-motor ishushu na.Ukuba ukunyuka kwamaqondo obushushu emoto akuphezulu, okokuqala, khangela ukuba umsebenzi wokukhusela i-electronic thermal we-frequency converter usetwe ngokufanelekileyo.Ukuba isiguquli sefrikhwensi sisenayo intsalela, ixabiso elisetiwe kwangaphambili lomsebenzi wokhuselo lobushushu kufuneka liphumle.Ukuba ukunyuka kweqondo lokushisa kwemoto kuphezulu kakhulu kwaye ukugqithiswa kuqhelekileyo, kuthetha ukuba i-motor igcwele kakhulu.Ngeli xesha, kufuneka siqale sandise umlinganiselo wothumelo ngokufanelekileyo ukunciphisa umthwalo kwi-motor shaft.Ukuba inokunyuswa, yongeza umlinganiselo wosulelo.Ukuba umlinganiselo wothumelo awunakunyuswa, umthamo wemoto kufuneka unyuswe.(2) Khangela ukuba amandla ombane amanqanaba amathathu kwicala lemoto alungelelene.Ukuba i-voltage yesigaba sesithathu kwicala lemoto ayilingani, khangela ukuba i-voltage yesigaba sesithathu ekupheleni kokuphuma kwe-converter frequency ilinganisiwe.Ukuba nayo ayilungelelananga, ingxaki ingaphakathi kwi-converter frequency.Ukuba i-voltage ekupheleni kokuphuma kwe-converter frequency ilungelelene, ingxaki ilele kumgca osuka kwi-frequency converter ukuya kwi-motor.Jonga ukuba izikrufu zazo zonke iitheminali ziqinisiwe.Ukuba kukho ii-contact okanye ezinye izixhobo zombane phakathi kwesiguquli samaza kunye ne-motor, khangela ukuba iitheminali zezixhobo zombane ezifanelekileyo ziqinisiwe kwaye iimeko zoqhagamshelwano zoqhagamshelwano zilungile.Ukuba i-voltage yesigaba sesithathu kwicala le-motor ilinganiswe, kufuneka ukwazi i-frequency yokusebenza xa ukhubeka: Ukuba i-frequency yokusebenza iphantsi kunye nokulawulwa kwe-vector (okanye akukho lawulo lwe-vector) lusetyenzisiweyo, umlinganiselo we-U / f kufuneka uncitshiswe kuqala.Ukuba umthwalo usenokuqhutywa emva kokunciphisa, kuthetha ukuba umlinganiselo we-U / f wokuqala uphezulu kakhulu kwaye ixabiso le-peak of excitation current likhulu kakhulu, ngoko ke i-current ingancitshiswa ngokunciphisa umlinganiselo we-U / f.Ukuba akukho mthwalo omiselweyo emva kokunciphisa, kufuneka sicinge ngokunyusa umthamo we-inverter;Ukuba i-inverter inomsebenzi wokulawula i-vector, indlela yokulawula i-vector kufuneka yamkelwe.
I-Disclaimer: Eli nqaku liphinda liveliswe kwinethiwekhi, kwaye umxholo wenqaku kuphela wokufunda nokunxibelelana.Inethiwekhi ye-compressor yomoya ayithathi hlangothi kwiimbono kwinqaku.I-copyright yenqaku lelombhali wokuqala kunye neqonga.Ukuba kukho naluphi na ulwaphulo-mthetho, nceda uqhagamshelane ukuze ulucime.