Qhov sib txawv tseem ceeb ntawm lub cev muaj zog los ntawm kev hloov pauv zaus fais fab mov thiab lub cev muaj zog los ntawm lub zog zaus sine nthwv dej yog tias ntawm ib sab tes, nws ua haujlwm hauv ntau zaus los ntawm qhov tsawg zaus mus rau qhov siab zaus, thiab ntawm qhov tod tes, lub zog waveform yog non-sinusoidal. Los ntawm Fourier series tsom xam ntawm lub zog waveform, lub zog muab waveform muaj ntau dua 2N harmonics ntxiv rau qhov tseem ceeb nthwv dej (tswj nthwv dej) (tus lej ntawm cov nthwv dej modulation muaj nyob rau hauv txhua ib nrab ntawm nthwv dej tswj yog N). Thaum SPWM AC converter tso zis fais fab thiab siv nws rau lub cev muaj zog, tam sim no waveform ntawm lub cev muaj zog yuav tshwm sim ua nthwv dej sine nrog superimposed harmonics. Lub harmonic tam sim no yuav tsim ib qho pulsating magnetic flux Cheebtsam hauv lub magnetic circuit ntawm lub cev muaj zog asynchronous, thiab lub pulsating magnetic flux Cheebtsam yog superimposed rau ntawm lub ntsiab magnetic flux, yog li ntawd lub ntsiab magnetic flux muaj ib qho pulsating magnetic flux Cheebtsam. Lub pulsating magnetic flux Cheebtsam kuj ua rau lub magnetic circuit feem ntau yuav saturated, uas muaj cov teebmeem hauv qab no rau kev ua haujlwm ntawm lub cev muaj zog:
1. Tsim cov hluav taws xob sib nqus pulsating
Kev poob ntau ntxiv thiab kev ua haujlwm txo qis. Vim tias qhov tso zis ntawm lub zog hloov pauv zaus muaj ntau tus lej siab harmonics, cov harmonics no yuav tsim cov tooj liab thiab hlau siv sib xws, txo qhov ua haujlwm zoo. Txawm tias SPWM sinusoidal pulse width technology, uas siv dav tam sim no, tsuas yog txwv tsis pub cov harmonics qis thiab txo qhov pulsating torque ntawm lub cev muaj zog, yog li nthuav dav qhov kev ua haujlwm ruaj khov ntawm lub cev muaj zog ntawm qhov ceev qis. Thiab cov harmonics siab dua tsis tsuas yog tsis txo qis, tab sis nce ntxiv. Feem ntau, piv nrog lub zog zaus sine fais fab mov, qhov ua haujlwm tau txo qis los ntawm 1% txog 3%, thiab lub zog fais fab tau txo qis los ntawm 4% txog 10%, yog li qhov poob harmonic ntawm lub cev muaj zog hauv qab lub zog hloov pauv zaus yog qhov teeb meem loj.
b) Tsim kom muaj kev co thiab suab nrov ntawm lub tshuab hluav taws xob. Vim muaj ntau yam kev sib raug zoo siab, kev co thiab suab nrov ntawm lub tshuab hluav taws xob kuj tseem yuav tsim tawm. Yuav ua li cas kom txo tau kev co thiab suab nrov twb yog ib qho teeb meem rau cov cav uas siv hluav taws xob sine wave. Rau cov cav uas siv hluav taws xob los ntawm lub inverter, qhov teeb meem no nyuaj dua vim yog qhov tsis yog sinusoidal ntawm lub zog fais fab.
c) Lub zog qis qis tshwm sim ntawm qhov ceev qis. Lub zog harmonic magnetomotive thiab rotor harmonic tam sim no synthesis, ua rau muaj qhov sib xws ntawm harmonic electromagnetic torque thiab alternating harmonic electromagnetic torque, alternating harmonic electromagnetic torque yuav ua rau lub cev muaj zog pulsation, yog li cuam tshuam rau qhov ceev qis ua haujlwm ruaj khov. Txawm tias yog siv SPWM modulation hom, piv nrog lub zog zaus sine fais fab mov, tseem yuav muaj qee qib ntawm qis-order harmonics, uas yuav tsim pulsating torque ntawm qhov ceev qis thiab cuam tshuam rau kev ua haujlwm ruaj khov ntawm lub cev muaj zog ntawm qhov ceev qis.
2. Tsim kom muaj lub zog hluav taws xob thiab lub zog hluav taws xob axial (tam sim no) rau kev rwb thaiv tsev
a) Muaj hluav taws xob ntau dhau. Thaum lub cev muaj zog khiav, feem ntau qhov hluav taws xob uas siv los ntawm lub zog ntau dhau yuav sib tshooj nrog qhov hluav taws xob ntau dhau uas tsim thaum cov khoom hauv lub cuab yeej hloov pauv zaus raug hloov pauv, thiab qee zaum qhov hluav taws xob ntau dhau yuav siab, ua rau muaj hluav taws xob ntau zaus rau lub kauj thiab ua rau lub rwb thaiv tsev puas tsuaj.
b) Tsim cov hluav taws xob axial thiab cov hluav taws xob axial. Kev tsim cov hluav taws xob ntawm lub ncej feem ntau yog vim muaj qhov tsis sib npaug ntawm lub zog sib nqus thiab cov xwm txheej electrostatic induction, uas tsis loj heev rau cov cav ib txwm muaj, tab sis nws pom tseeb dua rau cov cav uas siv hluav taws xob ntau zaus. Yog tias qhov hluav taws xob ntawm lub ncej siab dhau, lub xeev lubrication ntawm cov roj zaj duab xis ntawm lub ncej thiab lub bearing yuav raug puas tsuaj, thiab lub neej ua haujlwm ntawm lub bearing yuav luv dua.
c) Kev tso cua sov tawm cuam tshuam rau qhov cuam tshuam ntawm kev tso cua sov tawm thaum khiav ntawm qhov ceev qis. Vim yog qhov kev tswj hwm ceev loj ntawm lub cev muaj zog hloov pauv zaus, nws feem ntau khiav ntawm qhov ceev qis ntawm qhov zaus qis. Lub sijhawm no, vim tias qhov ceev qis heev, cua txias uas muab los ntawm txoj kev txias ntawm tus kheej uas siv los ntawm lub cev muaj zog ib txwm tsis txaus, thiab cov nyhuv tso cua sov tawm raug txo qis, thiab yuav tsum siv lub kiv cua txias ywj pheej.
Kev cuam tshuam ntawm lub tshuab yog qhov yooj yim rau resonance, feem ntau, txhua yam khoom siv kho tshuab yuav tsim cov xwm txheej resonance. Txawm li cas los xij, lub cev muaj zog khiav ntawm qhov zaus thiab qhov ceev tas li yuav tsum tsis txhob muaj resonance nrog lub zog ntuj ntawm cov lus teb hluav taws xob ntawm 50Hz. Thaum lub cev muaj zog ua haujlwm nrog kev hloov pauv zaus, qhov zaus ua haujlwm muaj ntau yam, thiab txhua yam khoom muaj nws tus kheej zaus ntuj, uas yooj yim ua rau nws resonate ntawm qee qhov zaus.
Lub sijhawm tshaj tawm: Lub Ob Hlis-25-2025