Qhov txawv ntawm Asynchronous thiab Synchronous Machines
Hauv ntiaj teb kev tsim hluav taws xob, tshwj xeeb tshaj yog hauv cov tshuab fais fab thiab cov tsav tsheb hauv kev lag luam, cov lus asynchronous thiab synchronous machines feem ntau tshwm sim. Ob qho tib si yog alternating current (AC) tshuab uas ua haujlwm raws li lub hauv paus ntsiab lus ntawm kev sib hloov magnetic fields, tab sis lawv txawv hauv lawv cov torque generation, rotational speed, rotor structure, operating characteristics, thiab field applications. Kev nkag siab txog cov kev sib txawv no yog qhov tseem ceeb rau kev xaiv lub tshuab kom raug rau koj qhov load, efficiency, control, thiab cov nqi xav tau.
1. Nkag Siab Txog Cov Tshuab Asynchronous (Induction)
Cov tshuab asynchronous feem ntau hu ua induction motors. Lo lus "asynchronous" txhais tau hais tias qhov ceev ntawm lub rotor tsis zoo ib yam li qhov ceev ntawm lub magnetic field uas tig hauv stator (hu ua synchronous speed). Cov tshuab no ua haujlwm raws li electromagnetic induction: cov hluav taws xob rotor tshwm sim vim qhov sib txawv ntawm qhov ceev ntawm lub rotor stator thiab lub rotor. Qhov sib txawv ntawm qhov ceev no hu ua slip.
Cov tshuab hluav taws xob induction siv dav vim tias lawv yooj yim tsim, muaj zog, yooj yim saib xyuas, thiab pheej yig.
2. Kev Txhais ntawm Lub Tshuab Sib Tshuam
Lub tshuab synchronous yog lub tshuab AC uas nws lub rotor tig ntawm qhov ceev tib yam li lub stator magnetic field, yog li nws tau hais tias yog "synchronous." Rau lub rotor kom "xauv" rau lub stator magnetic field, nws yuav tsum muaj nws tus kheej lub magnetic field, feem ntau tau los ntawm:
1. DC excitation tam sim no (ntawm slip rings lossis brushless exciter), lossis
2. Cov hlau nplaum tas mus li (hauv cov tshuab hluav taws xob sib txuas ua ke uas muaj hlau nplaum tas mus li).
Cov tshuab synchronous tuaj yeem ua haujlwm ua ob qho tib si motors thiab generators. Hauv cov chaw tsim hluav taws xob, cov synchronous generators yog ib qho tseem ceeb vim tias lawv tsim cov zaus thiab voltage raws li lawv qhov ceev tig.
3. Qhov sib txawv ntawm Txoj Cai Ua Haujlwm: Slip vs. Synchronous Locked
Qhov sib txawv tseem ceeb tshaj plaws yog nyob rau hauv kev sib raug zoo ntawm qhov ceev ntawm rotor thiab qhov ceev ntawm stator.
- Hauv lub tshuab asynchronous, lub rotor yuav tsum qeeb me ntsis tom qab qhov ceev synchronous kom cov hluav taws xob raug tsim hauv lub rotor thiab tsim torque. Yog tsis muaj kev plam, tsis muaj hluav taws xob induced hauv lub rotor, yog li tsis muaj torque.
– Hauv lub tshuab synchronous, lub rotor "xauv" rau lub tshav pob ntawm stator. Thaum synchronous lawm, nws qhov ceev tseem ruaj khov, ua raws li qhov zaus ntawm lub zog.
Lub Tswv Yim:
- Asynchronous: xav tau kev swb los tsim lub zog
- Synchronous: tsis tas yuav plam thaum lub sijhawm ua haujlwm ruaj khov
4. Kev Tig Ceev thiab Kev Ruaj Ntseg Ceev
Qhov ceev synchronous yog txiav txim siab los ntawm zaus thiab tus naj npawb ntawm cov ncej:
\[
n_s = \frac{120 f}{P}
\]
qhov twg \(n_s\) yog rpm, \(f\) yog zaus (Hz), thiab \(P\) yog tus naj npawb ntawm cov ncej.
– Lub cev muaj zog induction: qhov ceev yog qis dua me ntsis \(n_s\), thiab sib txawv nyob ntawm qhov hnyav (qhov hnyav dua, qhov kev plam nce ntxiv, qhov ceev txo qis).
- Lub cev muaj zog synchronous: nws qhov ceev yog raws nraim \(n_s\), tsis hloov pauv txawm tias qhov thauj khoom hloov pauv (tsuav yog nws tsis tshaj qhov txwv torque siab tshaj plaws, lossis "pull-out torque").
Yog li, yog tias daim ntawv thov xav tau qhov ceev tsis tu ncua, lub cev muaj zog synchronous feem ntau zoo dua.
5. Kev Tsim Kho Rotor: Lub Tawb Noog vs Kev Txhawb Siab
Qhov sib txawv ntawm kev tsim kho rotor kuj tseem ceeb heev:
Asynchronous Tshuab Rotor
Feem ntau siv:
- Lub rotor ntawm lub tawb nas: cov hlau txuas nrog los ntawm cov nplhaib kawg, ruaj khov thiab xav tau kev saib xyuas tsawg kawg nkaus.
- Kuj tseem muaj lub rotor qhov txhab rau kev hloov kho torque thawj zaug lossis qee yam kev tswj hwm.
Synchronous Tshuab Rotor
Lub rotor yuav tsum muaj qhov chaw magnetic field:
- Lub rotor nrog DC excitation
- los yog rotor nrog lub hlau nplaum tas mus li
Vim muaj lub kaw lus txhawb siab, cov tshuab synchronous feem ntau nyuaj dua thiab xav tau kev tswj hwm ntxiv.
6. Txoj Kev Pib
Cov motors induction yooj yim pib:
- Muaj peev xwm txuas ncaj qha rau qhov chaw (DOL) rau cov qhov me me-nruab nrab,
- los yog siv lub hnub qub-delta, autotransformer, soft starter, lossis inverter/VFD los txo qhov tam sim no pib.
Cov motors synchronous nyuaj dua rau pib vim tias lub rotor "tsis synchronized" thaum pib:
- Ntau lub tshuab hluav taws xob synchronous siv cov txheej txheem pib xws li damper winding, auxiliary motors, lossis VFDs kom maj mam nce qhov zaus mus rau synchronous.
Yog li, los ntawm sab kev siv tau ntawm kev pib, cov motors induction feem ntau yooj yim dua.
7. Lub zog fais fab thiab kev tswj hwm reactive
Ib qho tseem ceeb ntawm lub tshuab synchronous yog nws lub peev xwm los tswj lub zog fais fab.
- Cov tshuab hluav taws xob induction feem ntau muaj qhov lagging (inductive) fais fab, tshwj xeeb tshaj yog thaum lub teeb thauj khoom, vim tias lawv xav tau magnetizing tam sim no los ntawm lub network.
- Cov motors synchronous tuaj yeem tswj lawv qhov kev txhawb zog:
- Tsis zoo siab → lagging
– Zoo siab dhau → ua ntej (tuaj yeem muab lub zog reactive)
Yog li ntawd, cov motors synchronous feem ntau siv ua cov condenser synchronous los txhim kho cov yam ntxwv fais fab thiab txhawb nqa kev tswj hwm hluav taws xob ntawm lub zog.
8. Kev Ua Haujlwm Zoo thiab Kev Txij Nkawm
Feem ntau:
- Cov tshuab hluav taws xob induction: ua haujlwm tau zoo, tab sis muaj kev poob ntawm rotor vim yog cov hluav taws xob induced thiab slip. Rau cov ntawv thov dav dav, kev ua haujlwm tau zoo heev, tshwj xeeb tshaj yog nyob rau hauv cov qauv niaj hnub IE3 / IE4.
- Cov cav synchronous: muaj peev xwm ua haujlwm tau zoo heev, tshwj xeeb tshaj yog cov cav synchronous magnet tas mus li vim tias lawv tsis xav tau rotor tam sim no rau kev txhawb nqa thiab rotor poob qis dua.
Txawm li cas los xij, cov motors synchronous feem ntau:
- kim dua,
- cov txheej txheem tswj hwm thiab kev txhawb zog ntau dua,
- kev saib xyuas tuaj yeem tshwj xeeb dua (tshwj xeeb tshaj yog ntawm lub rotor excitation thiab booster system).
9. Tus nqi ntawm lub kaw lus thiab qhov nyuaj ntawm lub kaw lus
Los ntawm kev xam pom txog kev lag luam thiab kev siv:
- Cov tshuab asynchronous: cov nqi pib qis dua, kev teeb tsa yooj yim, tsim nyog rau cov kev xav tau kev lag luam dav dav.
– Cov tshuab synchronous: cov nqi pib siab dua vim yog kev txhawb zog, kev tswj hwm, thiab kev tsim kho rotor. Txawm li cas los xij, hauv qee qhov kev siv, kev txuag hluav taws xob, kev tswj hwm lub zog fais fab, thiab kev ruaj khov ntawm qhov ceev tuaj yeem ua rau tag nrho cov nqi ntawm kev muaj (TCO) zoo dua.
10. Cov Ntawv Thov Dav Dav hauv Kev Lag Luam
Cov Ntawv Thov Tshuab Asynchronous
- Twj tso kua mis, kiv cua, tshuab cua
- Lub tshuab nqa khoom
– Lub tshuab cua txias
- Cov tshuab tsim khoom dav dav
Vim tias nws ruaj khov, pheej yig, thiab yooj yim rau kev khiav lag luam, cov motors induction tau dhau los ua "tib neeg lub cev muaj zog" hauv kev lag luam.
Cov Ntawv Thov Tshuab Synchronous
- Cov tshuab hluav taws xob hauv cov chaw tsim hluav taws xob (PLTU, PLTA, PLTG, PLTD loj)
- Cov tshuab tsav ceev tas li: cov compressors loj, cov mills, qee cov crushers
- Kev txhim kho qhov fais fab (synchronous condenser)
- Cov ntawv thov ua haujlwm tau zoo: cov tshuab hluav taws xob sib nqus tas mus li hauv cov txheej txheem niaj hnub (HVAC zoo tshaj plaws, qee lub tsheb fais fab, thiab cov lag luam uas xav tau kev ua haujlwm zoo tshaj plaws)
Xaus
Qhov sib txawv tseem ceeb ntawm cov tshuab asynchronous thiab synchronous yog nyob rau hauv kev sib raug zoo ntawm qhov ceev ntawm rotor rau qhov ceev ntawm stator magnetic field. Cov tshuab asynchronous xav tau slip los tsim torque, yog li lawv qhov ceev yog me ntsis qis dua qhov ceev synchronous thiab feem ntau hloov pauv nrog load. Lub caij no, cov tshuab synchronous tig raws nraim ntawm qhov ceev synchronous, muab qhov ceev ruaj khov heev thiab muaj peev xwm tswj hwm lub zog los ntawm kev txhawb nqa.
Hauv kev siv tiag tiag, cov motors induction zoo tshaj plaws hauv kev yooj yim, kev ruaj khov, thiab tus nqi, thaum cov motors synchronous zoo tshaj plaws hauv kev ruaj khov ntawm qhov ceev, kev tswj hwm lub zog reactive, thiab lub peev xwm rau kev ua haujlwm zoo hauv qee qhov kev siv. Qhov kev xaiv zoo tshaj plaws nyob ntawm koj cov kev xav tau: seb tus nqi thiab kev yooj yim yog qhov tseem ceeb, lossis kev ua tau zoo, kev ua haujlwm zoo, thiab kev tswj hwm lub zog yog qhov tseem ceeb.
Yog tias koj xav tau, kuv tuaj yeem pab los ntawm kev ntxiv ib daim ntawv sib piv sai, ib qho piv txwv ntawm kev xam qhov ceev synchronous, lossis cov lus pom zoo xaiv lub cev muaj zog rau ib qho xwm txheej tshwj xeeb hauv kev lag luam.
