Isihloko sikaChris Kinsfather |Mar 20, 2017 |Amadrayivu e-AC |
Izwe lokulawula izimoto lingadideka ngokuqinisekile.Ngokushintshana kwamagama, incazelo yangempela ye-VFD (Variable Frequency Drive) kwesinye isikhathi ingadidaniswa negama elithi INVERTER.Ukuze siqonde kangcono ukuthi kungani ukuthenga i-VFD kungase kube isixazululo esingcono kakhulu kuwe sifuna ukuqala ngencazelo emfushane neqondakala kalula yokuthi iyini ngempela i-VFD.
I-VFD iyisisetshenziswa sokuguqula imvamisa esisekelwe kugesi kanye nese-elekthronikhi ngenhloso ehlosiwe:
● Ukuthatha amandla e-AC ohlangothini lokunikezela
● Ukuguqula lawo mandla ku-voltage ye-DC
● Ukugcina leyo voltage ku-VFD
● Ukusebenzisa ubuchwepheshe bangaphakathi bobuchwepheshe bokushintsha okushesha kakhulu obubizwa nge-IGBT'S obuzodala ifomu 'elifana ne-sine wave' elingashintshwa “ngokushintsha imvamisa evamile engu-60 HZ” ibe yinani elihlukile, ngaleyo ndlela kuguqule isivinini se-inductive yesigaba esi-3 noma ngezinye izikhathi PM uhlobo motor.
Kuzwakala kulula kwesokudla?Okungenani amachashazi amathathu okuqala enzile… kodwa kulapho izinto zingaba nzima khona.Nakuba kuyiqiniso ukuthi i-VFD "Iguqulela" ulayini we-AC wamanje, okukhiqizwa yi-VFD AKULONA igagasi elihlanzekile le-AC sine.Ngiqonde ukuthini ngalokhu?Kulapho sijwayele ukuzwa khona ukudideka okuthile.Kuyinkolelo evamile ukuthi i-VFD ikhiqiza igagasi le-AC sine elimsulwa njenge-ROTARY PHASE CONVERTER (RPC), akunjalo.
Okuhlinzekwa yi-VFD empeleni ukulingisa i-sine wave nge-(PWM) yobubanzi be-pulse modulation.Okukhiphayo kwe-PWM empeleni kumane nje kusetshenziswe igagasi lokuphuma kwe-DC.Kule fomethi efihliwe, into efana ne-AC INDUCTION motor ayikwazi ukuhlukanisa phakathi kwamagagasi e-AC ne-DC.
Yonke inhloso ngemuva kwedivayisi ayilutho ngaphandle kokufanisa isivinini esidingekayo sokucubungula izinhlelo zokusebenza.Lokhu kungase kuhluke kusistimu yokudlulisa, amasistimu aphephetha-moya/aphephethayo wezidingo zengcindezi noma ukugeleza, isivinini esidingekayo kuma-spindles ezikhungweni zomshini kanye nezinye izinhlobo eziningi zokucubungula izicelo ezisetshenziswa kuzo zonke izinhlobo zomkhakha.
Nokho, futhi yilesi sizathu lapho i-VFD ingakwazi ukusetshenziswa “NJENGEMPELA EJWAYELEKILE” ukuze ulawule umshini, ISILAWULI SPEEDE SE-MOTOR.Noma yikuphi ukusetshenziswa kabi kwale njongo kungaholela ekuhlulekeni kwemishini noma kwe-VFD.
Yiziphi izinhlelo zokusebenza i-VFD NGEKE isetshenziswe kuzo?
● Imithwalo engazweli (Amashisela, Ohhavini, Izifudumezi, njll)
● Amamotho weSigaba soku-1 endabuko anamakepisi
● Izisetshenziswa ezinephaneli yokulawula eyinhloko kanye (nokusabalalisa kwangaphakathi) nomzamo wokusebenzisa i-VFD njengomthombo wamandla.
● Ukusebenzisa i-VFD emshinini onamaswishi axhunywe ngqo kumotho (i-VFD idinga ukuxhunywa ngqo enjinini) Amasekhethi avulekile adala imililo njengesibonelo.
Ngamafuphi, umuntu kufanele asebenzise i-RPC ukulawula umshini wonke uma udinga amandla ezigaba ezi-3 futhi asebenzise i-VFD uma umuntu edinga ngempela ukulawula isivinini semoto futhi exhumeke ngqo ku-AC induction motor ekwazi ukuphatha ifomu lamagagasi njengoba kuhlinzekwe Isilawuli se-VFD.Ngokusebenzisa le logic elula, umuntu ngeke abe nokuhluleka kwemishini futhi.
UChris Kinsfather
Isikhathi sokuthumela: Oct-19-2022