Piv txwv cov lus nug sib tham
Lub tshuab hluav taws xob yog ib lub cuab yeej hluav taws xob uas hloov lub zog tshuab mus ua hluav taws xob los ntawm lub hauv paus ntsiab lus ntawm kev siv hluav taws xob los ntawm hluav taws xob. Cov hom tshuab hluav taws xob feem ntau siv yog cov tshuab hluav taws xob sib xws thiab cov tshuab hluav taws xob sib xws (lossis kev siv hluav taws xob). Tsab xov xwm no yuav muab ntau yam piv txwv txog cov teeb meem thiab kev sib tham txog cov tshuab hluav taws xob kom peb nkag siab tob txog lawv cov hauv paus ntsiab lus ua haujlwm, cov khoom, thiab cov ntawv thov hauv cov voj voog hluav taws xob.
Txoj Cai Ua Haujlwm ntawm Generator
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm lub tshuab hluav taws xob yog raws li Faraday Txoj Cai ntawm Electromagnetic Induction, uas hais tias kev hloov pauv ntawm cov hlau nplaum hauv lub voj voog ntawm cov hlau yuav tsim lub zog electromotive (EMF). Lub tshuab hluav taws xob muaj ntau yam khoom tseem ceeb:
1. Rotor: Qhov tig.
2. Stator: Qhov chaw ruaj khov, qhov chaw uas cov hlau khov kho lossis lub kauj raug muab tso rau.
3. Lub Zog Sib Nqus: Tsim los ntawm cov hlau nplaum tas mus li lossis cov hlau nplaum hluav taws xob.
Cov Lus Nug Piv Txwv thiab Kev Sib Tham
Lo Lus Nug 1: Xam Qhov Hluav Taws Xob Uas Tau Txhaum Cai
Lo lus nug: Lub tshuab hluav taws xob muaj 50 qhov tig ntawm lub kauj stator. Yog tias qhov ceev ntawm lub rotor tig yog 1200 rpm (kev tig ib feeb) thiab lub zog sib nqus los ntawm ib qho tig hloov pauv los ntawm 0,02 Wb, qhov Induced Voltage (EMF) uas lub tshuab hluav taws xob tsim tawm yog dab tsi?
Kev Sib Tham: Txhawm rau xam qhov hluav taws xob uas tau tsim peb tuaj yeem siv Faraday's Law equation:
\[ \text{EMF} = -N \frac{d\Phi}{dt} \]
Qhov twg:
– \( N \) yog tus naj npawb ntawm kev tig,
- \( \Phi \) yog lub zog sib nqus, thiab
- \( t \) yog lub sijhawm.
Kauj ruam thawj zaug yog hloov qhov ceev ntawm RPM mus rau RPS (kev tig ib ob):
\[ 1200 RPM = \frac{1200}{60} \text{ RPS} = 20 \text{ RPS} \]
Cov flux hloov pauv nrog txhua qhov kev hloov pauv, yog li qhov zaus ntawm kev hloov pauv flux yog tib yam li qhov zaus tig, uas yog 20 Hz. Yog li, qhov kev hloov pauv ntawm flux ib ob (\( \frac{d\Phi}{dt} \)) yog:
\[ \frac{d\Phi}{dt} = 0,02 \text{ Wb} \times 20 \text{ Hz} = 0,4 \text{ Wb/s} \]
Yog li ntawd, qhov induced voltage yog:
\[ \text{EMF} = -50 \times 0,4 \text{ V} = -20 \text{ V} \]
Vim tias EMF yog tus nqi kiag li, qhov hluav taws xob tshwm sim yog 20 V.
Lo lus nug 2: Lub zog tso zis ntawm lub tshuab hluav taws xob
Lo lus nug: Yog tias lub tshuab hluav taws xob hauv lo lus nug dhau los ntws los ntawm lub zog tiv taus ntawm 10 ohms, muaj pes tsawg lub zog hluav taws xob raug tsim tawm?
Kev Sib Tham: Ua ntej, peb xam cov hluav taws xob tam sim no siv Ohm's Law:
\[ Kuv = \frac{V}{R} = \frac{20 \text{ V}}{10 \text{ ohm}} = 2 \text{ A} \]
Lub zog hluav taws xob uas tau tsim tawm tuaj yeem suav nrog siv cov mis:
\[ P = V \times I = 20 \text{ V} \times 2 \text{ A} = 40 \text{ W} \]
Yog li, lub zog hluav taws xob tsim tawm yog 40 watts.
Lo lus nug 3: Kev ua haujlwm ntawm lub tshuab hluav taws xob
Lo lus nug: Lub tshuab hluav taws xob muaj lub zog nkag ntawm 60 watts thiab lub zog tso zis hluav taws xob ntawm 45 watts. Lub tshuab hluav taws xob ua haujlwm zoo li cas?
Kev Sib Tham: Kev ua haujlwm ntawm lub tshuab hluav taws xob tuaj yeem suav tau siv cov qauv:
\[ \eta = \frac{P_{\text{out}}}{P_{\text{in}}} \times 100\% \]
Qhov twg:
– \( P_{\text{out}} \) yog lub zog hluav taws xob tso zis,
- \( P_{\text{in}} \) yog lub zog nkag mechanical.
Yog li ntawd, qhov ua tau zoo yog:
\[ \eta = \frac{45 \text{ W}}{60 \text{ W}} \times 100\% = 75\% \]
Lo lus nug 4: Zaus ntawm Lub Hwj Chim AC Tsim Tawm
Lo lus nug: Lub tshuab hluav taws xob synchronous muaj 4 tus ncej thiab tig ntawm 1800 rpm. Qhov zaus ntawm AC voltage tsim tawm yog dab tsi?
Kev Sib Tham: Qhov zaus ntawm AC voltage tsim los ntawm lub tshuab hluav taws xob synchronous tuaj yeem suav tau siv cov mis:
\[ f = \frac{P \times N}{120} \]
Qhov twg:
- \( P \) yog tus naj npawb ntawm cov ncej,
- \( N \) yog qhov ceev tig hauv RPM.
Hloov cov nqi uas tau muab:
\[ f = \frac{4 \times 1800}{120} = 60 \text{ Hz} \]
Yog li, qhov zaus ntawm AC voltage tsim tawm yog 60 Hz.
Lo lus nug 5: Kev ceev sib xws
Lo lus nug: Txheeb xyuas qhov ceev synchronous ntawm lub generator txuas nrog 50 Hz fais fab grid thiab muaj 6 ncej.
Kev Sib Tham: Qhov ceev synchronous tuaj yeem suav tau siv cov mis:
\[ N_s = \frac{120 \times f}{P} \]
Qhov twg:
- \( N_s \) yog qhov ceev sib dhos hauv RPM,
- \( f \) yog zaus hauv Hz,
- \( P \) yog tus naj npawb ntawm cov ncej.
Hloov cov nqi uas tau muab:
\[ N_s = \frac{120 \times 50}{6} = 1000 \text{ RPM} \]
Yog li, qhov ceev synchronous ntawm lub generator yog 1000 RPM.
Xaus
Hauv tsab xov xwm no, peb tau tham txog cov ntsiab cai yooj yim ntawm kev ua haujlwm ntawm lub tshuab hluav taws xob thiab tau nthuav tawm ntau qhov teeb meem piv txwv uas cuam tshuam txog kev xam ntawm qhov hluav taws xob induced, lub zog hluav taws xob, kev ua haujlwm zoo, AC voltage zaus, thiab synchronous ceev. Los ntawm cov teeb meem no, peb tau pom tias ntau yam kev teeb tsa ntawm lub tshuab hluav taws xob muaj feem cuam tshuam li cas thiab lawv cuam tshuam li cas rau kev ua haujlwm tag nrho. Kev nkag siab zoo txog cov ntsiab cai no yog qhov tseem ceeb rau kev siv hauv kev tsim hluav taws xob.
