Peb -theem asynchronous motors yog ib hom induction lub cev muaj zog, nrog rau cov qauv hauv qab no thiab cov yam ntxwv:
I. Qauv
Peb -theem asynchronous motors feem ntau muaj ob lub hauv paus ntsiab lus: lub stator (taw ib feem) thiab rotor (rotating ib feem).
1. Stator:Lub stator yog qhov chaw nres tsheb ntawm lub cev muaj zog, feem ntau yog tsim los ntawm cov tub ntxhais thiab windings. Cov tub ntxhais feem ntau yog tsim los ntawm laminated silicon steel los xij kom txo qis eddy tam sim no thiab hysteresis poob. Cov windings raug mob nyob ib ncig ntawm cov tub ntxhais hauv ib qho qauv tshwj xeeb, tsim peb -theem windings AX, BY, thiab CZ. Cov windings no yog spatially offset los ntawm 120 hluav taws xob degrees los tsim ib tug rotating magnetic teb.
2. Rotor:Lub rotor yog lub rotating ib feem ntawm lub cev muaj zog, kuj muaj xws li ib tug hlau core thiab windings. Raws li cov qauv winding, rotors tau muab faib ua squirrel- tawb thiab hom kab mob. Squirrel-cage rotors muaj cov qauv yooj yim, txhim khu kev qha, thiab tus nqi qis, ua rau lawv siv dav. Cov kab mob rotors suav nrog peb-theem windings txuas ntawm lub nplhaib plam thiab txhuam mus rau sab nraud resistors, ua rau kev hloov ntawm lub cev muaj zog pib ua haujlwm thiab ceev.
Tsis tas li ntawd, peb -theem asynchronous motors suav nrog cov khoom siv pabcuam xws li cov npog kawg thiab cov kiv cua kom ntseeg tau tias kev ua haujlwm zoo thiab cua sov.
II. Kev ua tau zoo
1. Rotating Magnetic Field:Thaum symmetrical peb -theem alternating tam sim no yog siv rau lub stator windings, nws generates ib rotating magnetic teb uas txav clockwise ntawm synchronous ceev n1 nyob rau hauv qhov chaw ntawm lub stator thiab rotor. Qhov no rotating magnetic teb yog qhov tseem ceeb ntawm kev tsav lub cev muaj zog rotating.
2. Slip Rate:Vim lub rotor rotating nyob rau hauv tib txoj kev, tab sis nyob rau hauv ib tug sib txawv ceev tshaj lub stator lub rotating magnetic teb, ib tug plam tus nqi tshwm sim. Tus nqi swb yog ib qho tseem ceeb ntawm lub cev muaj zog rau induction motors, qhia qhov txawv ntawm rotor ceev n thiab magnetic teb ceev n0. Raws li kev ntsuas kev ua haujlwm, tus nqi qis feem ntau me me, xws li kwv yees li 0.015 txog 0.06.
3. Qhov tseem ceeb Performance Parameters:
● Efficiency (η):Efficiency yog qhov piv ntawm cov zis hluav taws xob rau lub zog input. Kev ua haujlwm siab qhia tau hais tias lub cev muaj zog tuaj yeem hloov ntau lub zog nkag mus rau hauv cov zis hluav taws xob.
● Lub Zog Muaj Zog (COSΦ):Lub zog tseem ceeb yog qhov piv ntawm lub zog ua haujlwm rau lub zog pom tseeb. Nws ntsuas qhov ua tau zoo ntawm cov khoom siv hluav taws xob. Ib qho hluav taws xob tsawg qhia tau hais tias qhov tseem ceeb reactive zog noj nyob rau hauv lub Circuit Court rau alternating magnetic teb conversion, nce kab fais fab mov poob.
● Xauv-rotor Torque (Pib Torque) TK:Lub torque generated thaum voltage yog siv rau ib tug nyob ruaj ruaj lub cev muaj zog (n=0, s=1) yog hu ua pib torque. Qhov piv ntawm qhov pib torque rau qhov ntsuas torque yog qhov pib torque ntau, characterizing lub cev muaj peev xwm pib.
● Xauv-rotor tam sim no (pib tam sim no) IA:Qhov no yog hais txog qhov inrush tam sim no thaum cov khoom siv hluav taws xob (inductive load) thawj zaug pib. Qhov piv ntawm qhov pib tam sim no rau qhov ntsuas tam sim no yog hu ua qhov pib tam sim no ntau yam. Qhov pib tam sim no ntawm lub cev muaj zog asynchronous tsis cuam tshuam rau lub cev muaj zog nws tus kheej, vim tias pib tshwm sim rau lub sijhawm luv luv (instantaneously). Txawm li cas los xij, nws muaj qee yam cuam tshuam rau ntawm daim phiaj hluav taws xob.
● Maximum Torque TMAX:Qhov siab tshaj plaws kev sib hloov torque lub cev muaj zog tuaj yeem tsim nyob rau hauv cov xwm txheej ntsuas thaum thauj khoom nce ntxiv yam tsis ua rau lub sijhawm nres. Qhov sib piv ntawm qhov siab tshaj plaws torque rau cov ntsuas torque yog hu ua qhov siab tshaj plaws torque multiplier (tseem hu ua qhov ua haujlwm dhau), qhia tias lub cev muaj peev xwm tshaj tawm. Feem ntau, qhov siab tshaj plaws torque multiplier rau dav dav - lub hom phiaj motors ntawm 2.0 txog 2.3.
● Suab nrov:Lub suab nrov ntawm lub cev muaj zog tuaj yeem muab faib ua cov suab nrov hauv electromagnetic thiab cov suab nrov mechanical. Lub suab nrov electromagnetic tshwm sim los ntawm lub sijhawm- thiab qhov chaw- sib txawv ntawm cov hlau nplaum sib txawv ntawm cov khoom siv lub cev muaj zog. Mechanical suab nrov suav nrog lub suab nrov cua, suab nrov uas tsim los ntawm lub tsev resonance, thiab suab nrov los ntawm cov teeb meem zoo.
4. Tus nqi ntsuas:
● Rated Voltage:Qhov voltage ntawm lub cev muaj zog ua haujlwm ib txwm, sawv cev rau qhov zoo tshaj plaws voltage rau kev ua haujlwm ruaj khov.
● Rated Zaus:Tuam Tshoj txoj kev lag luam fais fab mov zaus tau teev tseg raws li 50Hz.
● Rated zog:Lub zog zoo tso zis ntawm lub cev muaj zog ncej nyob rau hauv rated kev khiav hauj lwm tej yam kev mob.
● Rated Tam sim no:Cov kab tam sim no nyob rau hauv stator windings thaum ntsuas voltage yog siv thiab ntsuas lub zog yog tso tawm ntawm lub ncej.
● Rated Ceev:Kev sib hloov ceev tau ua tiav ntawm lub zog ntsuas.
Hauv cov ntsiab lus, peb -theem asynchronous motors muaj qhov zoo xws li cov qauv yooj yim, kev lag luam txhim khu kev qha, kev ua haujlwm siab, thiab lub zog loj, ua rau lawv siv dav hauv kev tsim khoom.