Cov nyhuv ntawm lub cev muaj zog thaum muaj kev txwv kev tswj ceev ceev
[Txawj ntawm lub cav ntawm txoj cai hloov ceev ceev] Qhov kev tswj xauv tsav yog tsim rau AC ceev kev tswj raws li nws lub tswv yim yuavtsum. Txawm li cas los xij, qhov laj thawj ncaj qha rau qhov nce ntawm qhov kev hloov ceev npaum li cas yog qhov yooj yim qauv thiab tus nqi qis ntawm lub cev asynchronous. Nqi thiab yooj yim ceev tswj. Yog hais tias qhov kev hloov ntawm cov neeg hloov tsheb khiav ceev yuav tsum tau nruab nrog lub tshuab tshwj xeeb rau qhov kev hloov tawm ntau zaus, ces muaj qhov sib txawv. Lub simplicity inherently, sturdiness thiab durability ntawm cov kev hloov ceev zaus hloov ceev tsis tau ncaim? Yog li no, daim ntawv no qhia txog qhov teeb meem ntawm qhov kev hloov tawm lub cav thiab nws daim ntawv thov ntau thiab nws daim ntawv thov rau ntawm daim ntawv tshuab.
Cuam tshuam rau ntawm lub cav thiab nws cov kev ua haujlwm thaum lub sijhawm muaj kev txwv ceev ceev Kev tswj kom tsis txhob muaj peev xwm tswj Qhov kev ntsuas qhov hluav taws xob ntawm lub qhov kawg yog qhov tsis-sinusoidal tsis hais txog txoj kev tswj. Vim li no, qhov ntsuam xyuas ntawm cov cwj pwm ntawm cov ciav asynchronous nyob rau hauv cov tsis-sinusoidal tsis yog cov nyhuv ntawm lub cev muaj zog thaum muaj kev txwv ntau zaus kev tswj ceev.
Muaj ntau qhov hauv qab no:
Cov Kev Tsav Tsheb thiab Cov Hluav Taws Xob (Efficiency Motors) uas ua haujlwm tsis muaj cov khoom siv hluav taws xob uas tsis yog-sinusoidal, ntxiv nrog rau qhov kev puas tsuaj vim qhov tseem ceeb, kuj yuav ntxiv ntau cov nyiaj ntxiv. Qhov tseem ceeb tshaj plaws ntawm tus qauv stator tooj liab, qhov rotor copper poob thiab hlau poob, uas cuam tshuam qhov kev siv ntawm lub tshuab.
1. Tus stator tam sim no muaj kev puas tsuaj hauv stator windings ua rau kev sib raug zoo txuas mus ntxiv rau I2R. Thaum cov tawv nqaij nyhav tsis raug, tus stator tooj liab ntawm qhov tsis-sinusoidal tam sim no yog proportional rau cov square ntawm lub rms tam sim no. Yog hais tias tus stator theem yog m1 thiab tus stator tsis kam ntawm txhua theem yog R1, tag nrho stator tooj liab poob P1 muab hloov rau qhov sib npaug saum toj no rau tag nrho cov stator tam sim no rms Irms nrog rau kev siv tam sim no. Qhov sij hawm thib ob hauv qhov kev ua zauv yog tau. Harmonic poob. Nws yog pom los ntawm cov kev sim uas yog vim muaj kev sib haum xeeb tam sim no thiab qhov sib xyaw tov, qhov kev sib nqus ntawm qhov sib nqus cov nplaim hluav taws xob muaj zog tuaj, thiab qhov kev cia siab tam sim no nce, yog li ntawd cov khoom tseem ceeb ntawm qhov tam sim no kuj tau nce .
2, lub rotor tooj poob hauv lub harmonic zaus, feem ntau yuav xam tau tias yog tus stator winding tsis kam yog qhov, tab sis rau lub asynchronous tsav rotor, nws AC kuj zoo heev nce vim cov tawv nqaij nyhuv. Tshwj xeeb tshaj yog qhov tob-zawj tawb rotor yog tshwj xeeb yog loj heev. Ib lub tshuab synchronous los yog lub zog maj mam nyob hauv ib lub hwjchim qis zog muaj peev xwm ua kom muaj zog vim yog lub chaw stator. Cov losses uas tshwm sim nyob rau hauv rotor nto windings yog negligible. Thaum lub tshuab synchronous khiav hauv qab tsis muaj hluav taws xob uas tsis yog-sinusoidal. Lub sij hawm harmonic magnetic tej zaum induces lub rotor harmonic tam sim no, ib yam li ib lub cav asynchronous kev khiav hauj lwm ntawm nws cov synchronous ceev.
Ob lub teeb meem loj sib txawv ntawm 5 ntawm lub nrig qaum rov qab thiab lub teeb meem loj 7 ntawm kev sib tw rau pem hauv ntej yuav induce ib rotor tam sim no ntawm 6 zaus siv zaus, thiab rotor qhov tam sim no 300 Hz ntawm kev siv zaus ntawm 50 Hz. Zoo sib xws, 11th thiab 13th harmonics induce 12 lub sij hawm siv zaus, piv txwv li 600HZ ntawm rotor tam sim no. Ntawm cov zaus no, qhov AC tsis kam ntawm lub rotor ntau dua qhov DC tsis kam. Npaum li cas lub rotor kuj ua tau nce nyob ntawm tus neeg xyuas pib cross section thiab tus geometry ntawm cov rotor slots uas cov neeg sib tw tau teem caij. Ib tug neeg coj tooj liab raug coj los piv txwv txog 4 muaj AC tiv tawm mus rau DC rau 1.56 ntawm 50 Hz, piv ntawm 2.6 ntawm 300 Hz, thiab piv ntawm li 3.7 ntawm 600 Hz. Thaum muaj zog ntau dua, qhov no piv tau ntau ntxiv rau cov square root ntawm cov zaus.
3. Lub hauv paus poob rau hauv qhov sib xyaw ua kom tsis haum hlau kuj nce ntxiv vim qhov tshwm sim ntawm kev sib haum xeeb nyob rau hauv lub hwj chim hluav taws xob; qhov sib haum ntawm tus stator tam sim no tsim ib lub sij hawm harmonic magnetomotive quab yuam ntawm cov pa tsis sib haum. Tag nrho qhov sib txawv ntawm qhov sib txawv ntawm txhua qhov chaw nyob hauv cov huab cua sib txawv yog qhov kev sib raug ntawm cov kev siv thiab lub sij hawm sib txig sib txig sib luag. Rau cov theem peb theem ua rau muaj zog, qhov ncov ntawm qhov sib txawv ntawm qhov sib txawv ntawm huab cua yog li 10% loj tshaj qhov siv tus nqi, tab sis qhov nce ntawm hlau poob los ntawm lub sij hawm sib haum xeeb yog me me. Cov kev poob qeeb vim qhov dej ntub tawm ntawm lub qhov kawg thiab lub foob to ntawm qhov chute yuav ua rau kom muaj zog ntau dua qhov sib txawv. Qhov no yuav tsum tau xav tias thaum tsis muaj hluav taws xob tsis muaj hluav taws xob: cov nyhuv to ntawm qhov kawg yog nyob rau hauv stator thiab rotor windings. Ob leeg nyob ua ib ke, feem ntau ntawm cov kab cwj pwm tam sim no poob los ntawm cov dej ntws tawm mus nkag lub phaj kawg. Vim qhov kev hloov hauv theem sib txawv ntawm tus stator magnetic peev xwm thiab rotor magnetic tej zaum, lub ntsej muag uas muaj hluav taws xob raug tsim tawm hauv cov qauv khawm, thiab nws qhov sib txawv ntawm qhov kawg ntawm qhov kawg, ua rau poob hauv stator tub ntxhais thiab cov hniav .
4, tsav lub cev Harmonic poob yog ho txiav txim siab los ntawm cov ntsiab lus harmonic ntawm qhov siv cov lus thov. Qhov kev tivthaiv harmonic loj yog loj, lub cev tsis tau nce, thiab qhov ua haujlwm tsawg dua. Txawm licas losxij, feem ntau cov neeg ua haujlwm zoo li qub tsis tsim kev sib haumxeeb hauv qab 5, thaum lub siab ntawm kev sib haumxeeb siab dua. Lub zog ntawm qhov kev sib tw no tsis yog qhov tseem ceeb ntawm txoj kev ua haujlwm ntawm lub tshuab. Tshawb nrhiav thiab sib piv kev ntsuam xyuas ntawm cov cuab yeej nruab nrab asynchronous tau qhia tias lawv cov kev siv tag nrho tam sim no nce los ntawm kwv yees li 4% ntawm tus nqi siv. Yog tias cov tawv nqaij tsis pom kev, lub tooj poob ntawm lub cav yog proportional rau lub xwmfab ntawm tag nrho cov niaj hnub siv tam sim no, thiab qhov ua kom tsis sib haum yog 8% ntawm kev poob peev. Xav tias qhov rotor tiv thaiv tuaj yeem raug nce los ntawm qhov nruab nrab ntawm peb lub sij hawm vim cov tawv nqaij cov nyhuv, cov kev sib raug zoo ua rau lub tshuab yuav tsum yog 24% ntawm qhov poob. Yog hais tias tus tooj liab poob nyiaj rau 50% ntawm tag nrho cov nyiaj poob haujlwm, cov kev sib tov ua kom sib haum ua rau kom tag nrho lub cev poob ntawm 12%. Qhov nce ntawm hlau poob yog qhov nyuaj rau xam vim nws yog cuam tshuam los ntawm cov qauv ntawm lub cav thiab cov khoom siv hlau nplaum.
Yog hais tias qhov sib npaug ntawm qhov sib txawv hauv lub stator voltage waveform yog cov uas tsis tshua muaj siab, xws li nyob rau hauv 6-theem, qhov harmonic hlau poob nce tsis tshaj 10%. Yog tias cov hlau ploj thiab poob zis nyiaj rau 40% ntawm tag nrho cov kev ua lag luam, qhov kev sib haum xeeb ntawm kev tiv thaiv tsuas yog 4% ntawm tag nrho cov kev poob haujlwm. Kev sib txhuam poob thiab cov cua ntsawj yog tsis zoo, yog li tag nrho poob ntawm lub engine nce ntawm tsawg tshaj li 20%. Yog tias qhov kev ntsuas ntawm 90% ntawm 50 Hz synusoidal fais fab, qhov kev ua haujlwm ntawm lub cev tsuas yog txo ntawm 1% mus 2% vim muaj kev sib haum xeeb. Yog hais tias qhov sib xyaw ntawm kev sib raug zoo ntawm cov ntaub ntawv thov kev lag luam muaj peev xwm loj dua qhov kev tiv thaiv kev sib txuas ntawm 6-kauj ruam, qhov kev sib haum xeeb ntawm kev tsav lub cev yuav ua rau kom loj dua thiab tej zaum yuav zoo tshaj qhov poob. Yog tias muaj 6-kauj ruam fais fab kev lag luam, lub tshuab qis qis qis tsis muaj peev xwm nqus tau cov teeb meem loj zuj zus, yog li txo qhov kev tsav tsheb ntawm 5% los yog ntau dua. Hauv qhov no, thiaj li yuav ua haujlwm tau zoo, muaj 12-kauj ruam nthav inverter lossis siv rau theem 6-theem stator winding. Kev sib haum xeeb thiab kev sib haum xeeb ntawm kev tsav tsheb yog qhov tsis zoo ntawm qhov khoom thauj, yog li qhov tsis ntev ntawm lub sijhawm sib haum xeeb ntawm kev txiav txim siab yuav raug txiav txim siab los ntawm kev sib piv ntawm cov khoom noj hauv cov khoom noj thiab cov khoom tsis muaj kab-sinusoidal nyob rau hauv tsis muaj kev mob. Qhov no yog siv los txiav txim siab kwv yees ntau ntawm kev ua haujlwm ntawm kev ua haujlwm rau qee hom lossis qauv.
