1. Dab tsi yog qhov hloov pauv zaus?
Lub zaus converter yog ib lub hwj chim tswj ntaus ntawv uas siv lub on-off nyhuv ntawm lub hwj chim semiconductor pab kiag li lawm los hloov lub hwj chim zaus fais fab mov mus rau lwm zaus.
2. Qhov txawv ntawm PWM thiab PAM yog dab tsi?
PWM yog cov ntawv luv ntawm Lus Askiv Pulse Width Modulation, uas hloov cov mem tes dav ntawm lub tsheb ciav hlau mem tes raws li qee txoj cai los kho cov zis thiab waveform.
PAM yog cov ntawv luv ntawm Pulse Amplitude Modulation, uas yog ib qho kev hloov kho uas hloov cov mem tes amplitude ntawm lub tsheb ciav hlau mem tes raws li ib txoj cai lij choj los kho cov nqi tso zis thiab waveform.
3. Qhov txawv ntawm hom hluav taws xob thiab hom tam sim no yog dab tsi?
Lub ntsiab Circuit Court ntawm lub inverter tuaj yeem muab faib ua ob pawg: hom hluav taws xob yog qhov hloov pauv zaus uas hloov DC ntawm qhov hluav taws xob mus rau hauv AC, thiab lim ntawm DC Circuit Court yog lub capacitor; Hom tam sim no yog ib zaus converter uas hloov DC ntawm qhov tam sim no mus rau hauv AC, thiab nws DC voj filtering yog inductor.
4. Vim li cas qhov voltage thiab tam sim no ntawm inverter hloov proportionally?
Lub torque ntawm lub asynchronous lub cev muaj zog yog tsim los ntawm kev sib cuam tshuam ntawm magnetic flux ntawm lub cev muaj zog thiab tam sim no ntws hauv lub rotor, ntawm qhov ntsuas zaus, yog tias qhov voltage yog qhov tseeb thiab tsuas yog txo qhov zaus, ces qhov sib nqus flux loj heev, lub magnetic Circuit Court yog saturated, thiab lub cev muaj zog yuav raug hlawv nyob rau hauv mob hnyav. Yog li ntawd, qhov zaus thiab voltage yuav tsum tau hloov proportionally, uas yog, cov zis voltage ntawm lub inverter yuav tsum tau tswj thaum hloov lub zaus, thiaj li hais tias lub magnetic flux ntawm lub cev muaj zog yuav tsum tau tswj kom tsis txhob muaj qhov tshwm sim ntawm tsis muaj zog hlau nplaum thiab sib nqus saturation. Txoj kev tswj no feem ntau yog siv rau hauv lub zog txuag hluav taws xob xws li kiv cua thiab twj tso kua mis.
5. Thaum lub cev muaj zog tau tsav los ntawm lub zog siv hluav taws xob ntau zaus, qhov tam sim no nce thaum lub zog poob; Rau inverter drives, yog tias qhov hluav taws xob kuj poob thaum lub zaus poob, puas yog tam sim no nce?
Thaum cov zaus poob qis (tsawg ceev), yog tias tib lub zog tso tawm, qhov tam sim no nce, tab sis nyob rau hauv cov xwm txheej ntawm ib qho torque, tam sim no yuav luag tsis hloov.
6. Thaum siv lub tshuab hloov zaus, qhov pib tam sim no thiab pib lub zog ntawm lub cev muaj zog li cas?
Siv lub inverter ua haujlwm, qhov zaus thiab qhov hluav taws xob tau nce raws li lub cev muaj zog, thiab qhov pib tam sim no raug txwv tsawg dua 150% ntawm cov ntsuas tam sim no (125% ~ 200% nyob ntawm tus qauv). Thaum pib ncaj qha nrog lub hwj chim zaus fais fab mov, qhov pib tam sim no yog 6 ~ 7 zaug, yog li ntawd, kev cuam tshuam thiab hluav taws xob yuav tshwm sim. Kev siv cov zaus hloov pauv hloov pauv tuaj yeem pib ua haujlwm zoo (lub sijhawm pib ua ntev dua). Qhov pib tam sim no yog 1.2 ~ 1.5 npaug ntawm qhov ntsuas tam sim no, thiab qhov pib torque yog 70% ~ 120% ntawm qhov ntsuas torque; Rau zaus converters nrog tsis siv neeg torque li, qhov pib torque yog ntau tshaj 100%, thiab nws yuav pib nrog tag nrho cov load.
7. V/f hom txhais li cas?
Lub voltage V kuj txo qis proportionally thaum lub zaus poob, ib lo lus nug tau piav nyob rau hauv Teb 4. Qhov piv ntawm V rau f yog predetermined noj mus rau hauv tus account lub cev muaj zog yam ntxwv, thiab feem ntau ntau yam ntxwv yog khaws cia nyob rau hauv lub maub los lub cim xeeb ntaus ntawv (ROM), uas muaj peev xwm. yuav xaiv nrog ib tug hloov los yog hu
8. Thaum V thiab f hloov pauv raws li qhov sib npaug, lub zog ntawm lub cev muaj zog hloov li cas?
Thaum lub zaus poob, qhov voltage yog proportionalized kiag li, vim hais tias AC impedance ua me me tab sis DC kuj tsis hloov, lub hauv av torque generated ntawm tsawg ceev yuav txo. Yog li ntawd, muab V / f ntawm tsawg zaus, qhov tso zis hluav taws xob yuav tsum tau nce ntxiv me ntsis thiaj li tau txais qee qhov pib torque, thiab qhov nyiaj them no yog hu ua kev pib txhim kho. Nws tuaj yeem ua tiav ntau txoj hauv kev, xws li automating txoj kev, xaiv V / f hom, lossis kho potentiometers
9. Nws tau sau rau hauv phau ntawv qhia tias qhov sib txawv ntawm qhov ceev yog 60 ~ 6Hz, uas yog, 10: 1, yog li tsis muaj lub zog tso zis hauv qab 6Hz?
Hauv qab 6Hz, lub zog tseem tuaj yeem tso tawm, tab sis raws li qhov kub thiab txias ntawm lub cev muaj zog thiab qhov loj ntawm qhov pib torque, qhov tsawg kawg nkaus siv zaus yog li 6Hz, lub sijhawm no lub cev muaj zog tuaj yeem tso tawm cov ntsuas torque yam tsis muaj teeb meem cua sov loj. . Qhov tseeb tso zis zaus (pib zaus) ntawm lub inverter yog 0.5 ~ 3Hz raws li tus qauv.
10. Rau kev sib xyaw ua ke ntawm lub cev muaj zog yog siab dua 60Hz, nws kuj yuav tsum muaj qee qhov torque, nws puas ua tau?
Feem ntau tsis yog. Tshaj 60Hz (tseem muaj cov qauv saum toj no 50Hz) qhov hluav taws xob tseem tsis hloov pauv, feem ntau cov yam ntxwv ntawm lub zog tsis tu ncua, nyob rau hauv cov kev xav tau ceev rau tib lub zog, yuav tsum tau them sai sai rau kev xaiv lub cev muaj zog thiab lub zog inverter.