1, Efficiency thiab kub nce ntawm lub cev muaj zog
Lub zaus hloov pauv ib zaug hu ua VVVF (Variable Voltage Variable Frequency Inverter) vim yog kev cuam tshuam ntawm cov tuam txhab Japanese hauv Asia xws li Tuam Tshoj thiab Kaus Lim Qab Teb. Thaum lub sijhawm ua haujlwm, cov qib sib txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov tam sim no raug tsim los ua kom lub cev muaj zog ua haujlwm raws li qhov tsis yog-sinusoidal voltage thiab tam sim no. Siv dav siv sine yoj PWM zaus converter ua piv txwv, nws qhov kev sib haum xeeb qis qis yog xoom, thiab qhov tseem ceeb dua qhov sib xyaw ua ke uas yog kwv yees li ob npaug ntawm cov cab kuj zaus yog 2u1 (u yog qhov piv txwv).
PWM, pulse width modulation, yog cov cuab yeej tswj xyuas uas siv cov zis digital ntawm microprocessor los tswj cov analog circuit. PWM yog dav siv nyob rau hauv ntau lub teb, los ntawm kev ntsuas thiab kev sib txuas lus mus rau lub hwj chim tswj thiab hloov dua siab tshiab, vim hais tias ntawm nws yooj yim tswj, yooj, high efficiency thiab zoo dynamic teb. PWM yog ib lo lus nyob rau hauv switching tswj fais fab mov. Qhov no yog cais raws li kev tswj hom ntawm voltage stabilization. Ntxiv rau PWM hom, kuj muaj PFM hom thiab PWM, PFM hybrid hom.
Kev sib raug zoo siab dua yuav ua rau qhov nce ntawm stator tooj liab poob, rotor tooj liab (aluminium) poob, hlau poob thiab ntxiv poob ntawm lub cev muaj zog, thiab qhov tseem ceeb tshaj plaws yog rotor tooj liab (aluminium) poob. Vim tias lub cev muaj zog asynchronous yog qhov siv dav tshaj plaws thiab qhov xav tau loj tshaj plaws ntawm txhua yam ntawm cov motors. Asynchronous lub cev muaj zog yog AC lub cev muaj zog uas tsim hluav taws xob hluav taws xob los ntawm kev sib cuam tshuam ntawm huab cua-nruab nrab rotating magnetic teb thiab rotor winding induced tam sim no, yog li paub txog kev hloov pauv ntawm electromechanical zog rau hauv lub zog txhua yam. Vim tias nws cov rotor winding tam sim no yog induced, nws tseem hu ua induction motor.
Nws rotates ntawm lub synchronous ceev coj mus rau lub hauv paus zaus. Yog li ntawd, tom qab high-order harmonic voltage txiav lub rotor qhia bar nrog ib tug loj plam, nws yuav tsim ib tug loj rotor poob. Tsis tas li ntawd, ntxiv tooj liab poob vim yog cov nyhuv ntawm daim tawv nqaij yuav tsum tau txiav txim siab. Cov kev poob no yuav ua rau lub cev muaj zog ntxiv, txo kev ua haujlwm thiab lub zog tso zis.
Fais fab mov yog ib qho cuab yeej uas muab lub zog rau cov khoom siv hluav taws xob, los yog lub zog hluav taws xob, uas muab lub zog hluav taws xob xav tau los ntawm tag nrho cov khoom hauv lub computer.
2, rwb thaiv tsev lub zog ntawm lub cev muaj zog
Tam sim no, ntau lub tshuab hluav taws xob me me thiab nruab nrab tau txais PWM tswj hom. Nws cov cab kuj zaus yog li ntawm ob peb txhiab mus rau kaum txhiab kilohertz, uas ua rau lub stator winding ntawm lub cev muaj zog dais ib tug high voltage nce tus nqi, uas yog sib npaug rau siv ib tug ntxhab impulse voltage rau lub cev muaj zog, thiab ua rau lub inter-tig rwb thaiv tsev ntawm lub cev muaj zog. dais qhov kev sim hnyav dua. Tsis tas li ntawd, cov duab plaub txiav impulse voltage tsim los ntawm PWM inverter superimposed ntawm lub cev muaj zog kev khiav hauj lwm voltage yuav ua rau muaj kev hem thawj rau lub cev muaj zog hauv av rwb thaiv tsev, uas yuav ua rau kom muaj kev laus nyob rau hauv qhov rov qab cuam tshuam ntawm high voltage.
3, Harmonic electromagnetic suab nrov thiab kev co
Kev co thiab suab nrov tshwm sim los ntawm electromagnetic, mechanical, cua thiab lwm yam yuav ua rau nyuaj dua thaum lub cev muaj zog asynchronous zoo tib yam tau siv los ntawm cov zaus hloov pauv.
Qhov sib txawv ntawm lub zog hluav taws xob yog los hloov AC lub zog hauv lub nroog lub zog los ntawm AC → DC → AC, thiab cov zis tawm yog lub zog ntshiab sine yoj. Cov zis zaus thiab voltage yog adjustable nyob rau hauv ib tug tej yam ntau yam. Nws yog qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv zaus siv rau kev tswj xyuas lub cev muaj zog, thiab kuj txawv ntawm qhov zoo tib yam AC tswj fais fab mov. Cov yam ntxwv ntawm cov khoom siv hluav taws xob zoo tshaj plaws AC yog qhov muaj zog ruaj khov, qhov muaj zog ruaj khov, kev tiv thaiv sab hauv sib npaug rau xoom, thiab qhov hluav taws xob waveform yog ntshiab sine yoj (tsis muaj kev cuam tshuam). Qhov sib txawv zaus fais fab mov yog ze rau qhov zoo tshaj plaws AC fais fab mov. Yog li ntawd, cov teb chaws vam meej tau nce siv cov khoom siv hluav taws xob sib txawv raws li cov qauv siv hluav taws xob, txhawm rau muab lub zog hluav taws xob zoo tshaj plaws rau cov khoom siv hluav taws xob thiab pab txhawb lub hom phiaj kev ntsuas kev ua haujlwm ntawm cov khoom siv hluav taws xob.
Muaj ob lub ntsiab ntawm cov khoom siv hluav taws xob sib txawv: linear amplification type thiab SPWM switching type.
4, Adaptability ntawm lub cev muaj zog kom nquag pib thiab nres
Txij li thaum lub cev muaj zog tuaj yeem pib yam tsis muaj kev cuam tshuam tam sim no ntawm qhov tsawg zaus thiab qhov hluav taws xob tom qab tau siv los ntawm kev hloov pauv zaus, thiab tuaj yeem siv ntau hom kev sib tsoo uas tau muab los ntawm kev hloov pauv zaus rau kev nrawm nrawm, uas tsim cov xwm txheej rau nquag pib thiab nres, lub tshuab tshuab thiab electromagnetic system ntawm lub cev muaj zog yog nyob rau hauv qhov kev txiav txim ntawm cyclic alternating quab yuam, uas ua rau qaug zog thiab ceev aging teeb meem rau cov neeg kho tshuab qauv thiab rwb thaiv tsev qauv.
5, Cov teeb meem cua txias ntawm qhov ceev ceev
Ua ntej ntawm tag nrho cov, lub impedance ntawm asynchronous lub cev muaj zog tsis zoo tagnrho. Thaum cov khoom siv hluav taws xob yog ib qho khoom siv uas muab lub zog rau cov khoom siv hluav taws xob, los yog lub hwj chim, nws muab lub zog hluav taws xob xav tau los ntawm tag nrho cov khoom hauv lub computer. Thaum qhov zaus tsawg, qhov poob tshwm sim los ntawm kev sib raug zoo siab dua hauv cov khoom siv hluav taws xob yog qhov loj. Qhov thib ob, thaum qhov ceev ntawm lub cev asynchronous zoo ib txwm txo qis dua, cov cua txias ntim qis dua proportionally rau lub cubic zog ntawm qhov ceev, uas ua rau lub deterioration ntawm qis-ceev txias txias ntawm lub cev muaj zog, thiab lub ntse nce ntawm kub nce, uas. ua rau nws nyuaj kom ua tiav qhov tso zis torque tas li.