Kab lus los ntawm Chris Kinsfather |Mar 20, 2017 |AC Tsav |
Lub ntiaj teb tswj lub cev muaj zog tuaj yeem ua rau tsis meej pem.Nrog rau kev sib hloov ntawm cov lus, lub ntsiab lus tseeb ntawm VFD (Variable Frequency Drive) tej zaum yuav tsis meej pem nrog lub sij hawm INVERTER.Txhawm rau kom nkag siab zoo dua yog vim li cas kev yuav VFD tuaj yeem lossis tsis yog qhov kev daws teeb meem zoo tshaj plaws rau koj peb xav pib nrog luv luv thiab yooj yim to taub lub ntsiab lus ntawm VFD tiag tiag yog dab tsi.
VFD yog ib qho khoom siv hluav taws xob thiab hluav taws xob raws li kev siv hluav taws xob nrog lub hom phiaj ntawm:
● Noj AC fais fab ntawm cov khoom siv
● Hloov lub zog ntawd mus rau qhov hluav taws xob DC
● Khaws qhov voltage hauv VFD
● Siv cov cuab yeej sab hauv ntawm superfast switching thev naus laus zis hu ua IGBT'S uas yuav tsim ib daim ntawv 'sine yoj-zoo li' uas tuaj yeem hloov kho los ntawm "hloov qhov ib txwm muaj 60 HZ zaus" mus rau qhov hloov pauv, yog li hloov qhov ceev ntawm 3 theem inductive lossis tej zaum PM hom motor.
Suab yooj yim txoj cai?Yam tsawg kawg yog thawj peb lub ntsiab lus mos txwv tau ua ... tab sis qhov no yog qhov uas tej yam tuaj yeem ua rau me ntsis nyuaj.Thaum nws muaj tseeb tias VFD ua "Invert" AC kab tam sim no, dab tsi yog tsim los ntawm VFD tsis yog AC sine yoj ntshiab.Kuv txhais li cas los ntawm qhov no?Qhov no yog qhov uas peb yuav muaj qee qhov tsis meej pem.Nws yog ib qho kev ntseeg uas VFD tsim cov ntshiab AC sine yoj ib yam li ROTARY PHASE CONVERTER (RPC), uas tsis yog li ntawd.
Qhov VFD tiag tiag muab yog qhov simulated sine yoj ntawm (PWM) pulse width modulation.PWM tso zis yog tiag tiag tsuas yog manipulated yoj ntawm DC tso zis.Nyob rau hauv daim ntawv disguised no, ib yam dab tsi zoo li AC INDUCTION lub cev muaj zog tsis tuaj yeem paub qhov txawv ntawm AC thiab DC nthwv dej.
Tag nrho lub hom phiaj tom qab lub cuab yeej yog tsis muaj dab tsi ntau tshaj li qhov yuav tsum tau muaj speeds tsim nyog rau cov txheej txheem kev siv.Qhov no tuaj yeem sib txawv los ntawm kev xa tawm, kiv cua / tshuab tshuab rau lub siab lossis cov kev xav tau ntws, ceev tsim nyog rau spindles ntawm machining chaw thiab ntau lwm yam kev ua daim ntawv thov siv nyob rau hauv txhua yam kev lag luam.
Txawm li cas los xij, nws tseem yog qhov laj thawj uas VFD tsis tuaj yeem siv los ua "GENERAL POWER SUPPLY" los tswj lub tshuab, nws yog qhov tshwj xeeb ntawm MOTOR SPEED CONTROLLER.Kev siv tsis raug ntawm lub hom phiaj no tuaj yeem ua rau cov khoom siv thiab lossis VFD tsis ua haujlwm.
Cov ntawv thov twg tuaj yeem siv VFD tsis siv rau?
● Resistive loads (welders, qhov cub, rhaub, thiab lwm yam)
● Ib txwm 1 Phase motors nrog lub kaus mom
● Cov khoom siv nrog lub ntsiab tswj vaj huam sib luag thiab (sib faib sab hauv) sim siv VFD los ua lub zog.
● Siv VFD rau lub tshuab nrog cov keyboards ncaj qha txuas nrog lub cev muaj zog (VFD yuav tsum tau txuas ncaj qha rau lub cev muaj zog) Qhib Circuit Court tsim hluav taws xob piv txwv.
Hauv luv luv, ib tus yuav tsum siv RPC los tswj tag nrho lub tshuab yog tias nws xav tau 3-theem fais fab thiab siv VFD yog tias ib tus xav tau kev tswj xyuas lub cev muaj zog tiag tiag thiab txuas ncaj qha rau AC induction lub cev muaj zog uas tuaj yeem tswj cov yoj daim ntawv raws li muab los ntawm VFD tswj.Hauv kev siv cov laj thawj yooj yim no, ib tus yuav tsis muaj cov cuab yeej ua tsis tiav dua.
Chris Kinsfather
Post lub sij hawm: Oct-19-2022