Cov yam ntxwv ntawm kev pib muaj peev xwm pib lub zog peb theem theem asynchronous
2.3 Nta
Asynchronous motor start-up requirements:
1. Lub tshuab muaj lub nkoj loj txaus.
2. Nyob rau hauv lub tsev ntawm ib tug me me ntawm pib lub zog, lub me me pib tam sim no, qhov zoo dua.
3. Cov khoom yuav tsum tau pib yog yooj yim thiab yooj yim rau kev khiav lag luam.
4. Lub zog me zog thaum pib, zoo dua.
Pib ntawm tus hleb tawb asynchronous lub cev:
1, pib ncaj qha
Ntawd yog qhov, qhov hluav taws xob uas siv rau lub stator winding ntawm lub cev thaum lub sijhawm pib yog qhov ntsuas ntawm cov khoom siv. Tus mob rau kev pib ntawm peb theem phase asynchronous engine (satisfying ib qho)
1. Motors nrog lub peev xwm qis dua 7.5KW tuaj yeem siv tau.
2. Qhov poob qhov teeb meem tshwm sim los ntawm lub cav thaum lub sijhawm pib yog tsis ntau tshaj 10% ntawm tus nqi hluav taws xob ntawm qhov hluav taws xob qhov hluav taws xob, thiab tuaj yeem tso mus rau 15% rau kev siv uas tsis nquag pib.
3, tuaj yeem siv cov qauv siv rau lub zog kom paub meej tias lub tshuab yuav pib ncaj qha
Zoo: Qhov pib siv ntaus ntawv yooj yim yog yooj yim, pib lub sij hawm luv luv, tus pib lub hom phiaj yog yooj yim, txhim khu kev qha, thiab tus nqi yuav tsum yog tsawg.
Disadvantages: ib qho kev cuam tshuam rau ntawm lub cev thiab lub hwj chim kab sib chaws
2, pib kauj ruam pib
Lub qhov hluav taws xob nyob ntawm tus stator winding yog txo thaum lub tshuab pib, thiab cov kev taw hluav taws xob nyob ntawm qhov pib thaum pib. Pib lub kauj ruam pib tuaj yeem txo qhov pib ntawm lub cav. Txawm li cas los xij, vim tias lub tshuab nqes tes yog qhov sib luag rau lub xwm fab xwm meem, lub zog ntawm lub cav yog txo qis dua thaum pib nqis pib, yog li nws tsuas yog tsim rau qhov tsis muaj qhov nyhav lossis pib lub teeb pib.
A, autotransformer (tseem hu ua tus neeg ua haujlwm) pib kauj ruam pib
(1) Txheej: Qhov siab tshaj ntawm qhov autotransformer muab tso rau hauv kab sib chaws, thiab sab sab nraud nres txuas nrog lub tshuab. Muaj ntau ntau cov kais dej uas muaj qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv.
(2) Nta: Tus piv txwv ntawm tus autotransformer yog K, qhov thawj qhov voltage yog U1, qhov kev hloov voltage U2 = U1 / K, thiab qib siab tam sim no I2 (piv txwv li, txoj kab ntawm lub stator winding ntawm lub cev) proportionally txo. Tsis tas li ntawd, txij thaum I1 = I2 / K, pib lub caij zog ntawm lub cav fais fab tuag yog 1 / K2 zaug uas pib kiag. Txij li thaum cov voltage txo los ntawm 1 / K zaug, lub tawb torque yog 1 / K2 zaug.
Muaj 2 ~ 3 cov pwm ntawm cov kais dej nyob rau sab nraub qaum ntawm autotransformer, xws li cov theem ob sab 80%, 60%, 40% ntawm cov sab sab hluav taws xob.
Zoo: Pib lub tapping pib xaiv tau los ntawm kev xaiv cov kais dej ntawm lub autotransformer raws li kev tso cai pib tam sim no thiab yuav tsum tau pib lub zog, thiab tus stator winding txais Y los yog Δ.
Disadvantages: Cov cuab yeej ua phem heev thiab cov peev yog kim dua.
B, lub hnub qub-triangle (Y-Δ) pib-nqis pib
(1) Kab: Thaum pib, txuas tus stator rau ib lub hnub qub, thiab mam li pib txuas rau Δ.
(2) Nta: Pib tam sim no, lub hwj huam mov tam sim no thiab pib lub zog yog tsuas yog 1/3 thaum pib ncaj qha.
Zoo: Cov cuab yeej yooj yim thiab tsis tshua muaj nqi.
Disadvantages: Nws tsuas yog siv rau kev txuas hauv Δ hauv kev khiav lag luam, kev txo qhov txo qhov siab yuav ruaj tuaj, thiab qee zaum qhov yuav tsum ua tsis tiav.
C, Yanbian daim duab peb sab pib
Ntawd ces yog, thaum pib, ib feem ntawm tus stator winding ntawm lub cev muaj kev txuas nrog Y Y, thiab lwm qhov yog txuas nrog ib hom Δ.
Nta: Start-up, qhov voltage ntawm txhua theem winding yog loj tshaj uas thaum muaj kev sib txuas rau kev sib tw tag nrho lub hnub qub, pib lub zog loj, tab sis cov qauv ntoo yog qhov nyuaj thiab daim ntawv thov yog tsawg.
D, txoj hlua ua haujlwm (los yog kev ua haujlwm) pib kauj ruam pib
Rau cov nas cias asynchronous lub cev, cov kauj ruam ntawm lub kauj ruam-lossis cia (lossis reactor) nyob hauv stator Circuit Court yuav siv tau los pib lub cav thaum pib. Thaum lub tshuab pib, lub resistor (lossis reactor) tau luv. Qhov no yog qhov yooj yim. Txawm li cas los xij, tus stator hlua txoj hauj lwm pib ua kom haus zog ntau dua, thiab tsuas yog siv rau qhov tsawg-voltage thiab low-power motors; tus stator hlua reactance start-up peev yog loj, thiab nws yog siv rau high-voltage thiab high-power motors. Vim hais tias ntawm thermal lub zog poob ntawm lub resistor, lub reactor yog heev thiab kim, thiab no txoj kev tsis tshua muaj siv.
