Inqaku likaChris Kinsfather |Mar 20, 2017 |AC Drives |
Ihlabathi lolawulo lweemoto linokubhida ngokuqinisekileyo.Ngokutshintshana kwamagama, intsingiselo yokwenyani yeVFD (Variable Frequency Drive) ngamanye amaxesha inokubhidaniswa negama elithi INVERTER.Ukuze uqonde ngcono ukuba kutheni ukuthenga i-VFD kusenokuba okanye kungabi sesona sisombululo silungileyo kuwe sifuna ukuqalisa ngengcaciso emfutshane nelula ukuyiqonda ukuba yintoni kanye kanye i-VFD.
I-VFD sisixhobo sokulawula umbane kunye nesekwe-elektroniki esekwe kwi-frequency kunye nenjongo ekujoliswe kuyo:
● Ukuthatha amandla e-AC kwicala lonikezelo
● Ukuguqula loo mandla kumbane we-DC
● Ukugcina loo mandla ombane kwi-VFD
● Ukusebenzisa ubuchwephesha bangaphakathi bokutshintsha ngokukhawuleza okubizwa ngokuba yi-IGBT'S obuya kudala uhlobo lwe-'sine wave-like' olunokuthi lujikwe “ngokutshintsha isiqhelo se-60 HZ frequency” kwixabiso elilelinye, ngaloo ndlela kutshintshe isantya se-3 phase inductive okanye ngamanye amaxesha PM uhlobo motor.
Ivakala ilula kunene?Ubuncinci iibhulethi ezintathu zokuqala ziyenzile… kodwa kulapho izinto zinokuba nzima khona.Ngelixa kuyinyani ukuba i-VFD yenza "Invert" i-AC line yangoku, into eveliswa yi-VFD AYIKHO i-AC sine wave ecocekileyo.Ndithetha ukuthini ngale nto?Apha kulapho sikholisa ukufumana ukubhideka okuthile.Yinkolelo eqhelekileyo ukuba i-VFD ivelisa i-AC sine wave ecocekileyo nje nge-ROTARY PHASE CONVERTER (RPC), akunjalo.
Eyona nto ibonelelwa yi-VFD yi-sine wave eyenziwe nge-(PWM) yokumodareyitha kobubanzi be-pulse.Imveliso ye-PWM eneneni ilawulwa ngamaza emveliso ye-DC.Kule fomati efihliweyo, into efana ne-AC INDUCTION motor ayikwazi ukwahlula phakathi kwamaza e-AC kunye ne-DC.
Yonke injongo emva kwesixhobo ayikho enye into ngaphandle kokudibanisa isantya esifunekayo kwizicelo zenkqubo.Oku kunokwahluka kwindlela yokuhambisa, ii-fan/blower systems zoxinzelelo okanye iimfuno zokuqukuqela, isantya esiyimfuneko kwi-spindles kumaziko omatshini kunye nezinye iintlobo ezininzi zokusetyenzwa kwezicelo ezisetyenziswa kuzo zonke iintlobo zeshishini.
Nangona kunjalo, ikwasesi sizathu sokuba i-VFD ingasetyenziswa “NJENGENIKEZELO YAMANDLA JIKELELE” kumatshini wokulawula, NGUMLAWULI WE-MOTOR SPEED.Nakuphi na ukusetyenziswa kakubi kwale njongo kunokukhokelela kwisixhobo kunye okanye ukusilela kweVFD.
Zeziphi izicelo EZINGASETYENZISWA kuzo i-VFD?
● Imithwalo ekwaziyo ukumelana (Ii-welders, ii-oveni, izifudumezi, njl.njl)
● Iinjini zeSigaba soku-1 zesiNtu ezineekepusi
● Izixhobo ezinephaneli yokulawula ephambili kunye (nokusasazwa kwangaphakathi) ukuzama ukusebenzisa i-VFD njengombane.
● Ukusebenzisa i-VFD kumatshini onezitshixo eziqhagamshelwe ngokuthe ngqo kwinjini (i-VFD ifuna ukuqhagamshelwa ngokuthe ngqo kwinjini) Iisekethe ezivulekileyo zidala imililo umzekelo.
Ngamafutshane, umntu kufuneka asebenzise i-RPC ukulawula umatshini uphela ukuba ufuna amandla esigaba esi-3 kwaye asebenzise i-VFD ukuba umntu ufuna ngokwenene ukulawula isantya semoto kwaye uqhagamshelo oluthe ngqo kwi-AC motor induction enokusingatha ifom yamaza njengoko ibonelelwe. Umlawuli weVFD.Ekusebenziseni le logic elula, umntu akayi kuba nokusilela kwesixhobo kwakhona.
UChris Kinsfather
Ixesha lokuposa: Oct-19-2022