Aasaaska Mashiinnada DC iyo AC
Mashiinka korontadu waa qalab tamarta u beddela qaab ilaa qaab kale iyada oo loo marayo mabaadi'da elektromagnetism. Injineernimada korontada, labada kooxood ee ugu aasaasiga badan uguna hadal haynta badan waa mashiinnada DC (current direct) iyo mashiinnada AC (current beddelka ah). Labaduba waxay u shaqayn karaan sidii matoorro (u beddelashada tamarta korontada tamar farsamo) ama matoorro (u beddelashada tamarta farsamada tamarta korontada). Maqaalkani wuxuu ka hadlayaa fikradaha aasaasiga ah, dhismaha, mabaadi'da hawlgalka, iyo kala duwanaanshaha muhiimka ah ee u dhexeeya mashiinnada DC iyo AC.
1. Fikradaha Aasaasiga ah ee Mashiinnada Korontada
Shaqada asaasiga ah ee mashiinka korontada ku shaqeeya waxay ku salaysan tahay laba mabda' oo waaweyn:
1. Xoogga Lorentz: koronto-wade hadda sita oo ku jira goob birlab ah ayaa la kulma xoog. Tani waa saldhigga sida matoorku u shaqeeyo, halkaas oo xoogga birlabku uu soo saaro xoog wareegaya rotor-ka.
2. Soo-kicinta elektromagnetic-ka (Sharciga Faraday): Isbeddel ku yimaada qulqulka birlabta ee dhex mara gudbiyaha ayaa soo saara danab la kiciyey. Tani waa saldhigga sida matoorku u shaqeeyo, halkaas oo wareegga farsamadu uu soo saaro danab koronto.
Si kale haddii loo dhigo, mashiinka korontada wuxuu adeegsadaa isdhexgalka goobaha birlabta iyo hirarka korontada si uu u soo saaro dhaqdhaqaaq, ama si liddi ah, si uu koronto uga soo saaro dhaqdhaqaaqa.
2. Mashiinka DC (Heerka Tooska ah)
2.1 Qeexidda iyo Astaamaha
Mashiinka DC waa mashiin koronto oo ka shaqeeya isha tooska ah ee hadda (DC). Mashiinnadani waxaa loo yaqaanaa fududaynta xawaaraha iyo xakamaynta wareegga. Si kastaba ha ahaatee, isticmaalka matoorada iyo burushyada ayaa dayactirka ka dhigaya mid aad u adag marka loo eego mashiinno badan oo AC ah.
2.2 Dhismaha Ugu Weyn ee Mashiinka DC
Guud ahaan, mashiinka DC wuxuu ka kooban yahay:
– Stator (qayb taagan): waxay soo saartaa goob birlabeed. Goob birlabeed waxaa samayn kara:
- Wareegyada goobta ee ulaha stator-ka, ama
– Magnet-yo joogto ah (matoorada DC-ga yaryar).
– Rotor/Armature (qayb wareegaysa): halkaas oo gariiradda armature ay ku taal. Gulufkan, danab la kiciyey iyo socodka hadda ayaa ka dhaca, kuwaas oo soo saara xoog.
– Konmutator: waa qayb qaab giraan ah oo kala qaybsan oo u shaqeysa inay rogto jihada hadda ee gariiradda rotor-ka si uu xooggu ugu sii jiro jihadaas oo kale.
– Burush: koronto-qaade (badanaa kaarboon) oo ka soo qaada isha ilaa qalabka korontada.
2.3 Mabda'a Shaqada ee DC Motor
Marka uu hadda dhex maro gariiradaha rotor-ka ee ku jira goobta birlabta ee stator-ka, xoog Lorentz ah ayaa laga soo saaraa qalabka korontada qaada. Xooggani wuxuu abuuraa wareegga, taasoo keenta in rotor-ku wareego. Si loo ilaaliyo wareegga jihada wareegga oo joogto ah, qalabka korontada qaada wuxuu dib u celiyaa xiriirka hadda jira badhkii wareeg kasta.
Xawaaraha matoorka DC waxaa saameeya:
- Baaxadda danab barroosinka,
- Baaxadda qulqulka goobta,
– Culays farsamo.
Xakamaynta xawaaraha matoorka DC si fudud ayaa loo samayn karaa, tusaale ahaan iyadoo la beddelayo danabka gelinta ama la hagaajinayo qulqulka goobta.
2.4 Mabda'a Shaqada Matoorka DC
Marka rotor-ka lagu wareejiyo ilo farsamo (tusaale ahaan, turbine), gariiradda rotor-ku waxay gooyaan qulqulka birlabta, iyagoo soo saaraya danab la kiciyey (AC, si dabiici ah). Konmutator-ku wuxuu markaa saxayaa natiijada, taasoo keenta wax soo saar DC ah oo ku yaal terminaalka.
2.5 Noocyada Mashiinnada DC
Mashiinnada DC waxaa badanaa lagu kala saaraa habka kicinta goobta:
– Shunt: gariiradda goobta oo barbar socota barroosinka (xawaare deggan).
– Taxane: gariiradda goobta oo taxane ah oo leh qalabka (torque-ka bilowga ah ee weyn).
– Isku-darka: isku-darka shunt iyo taxane (is-afgarad u dhexeeya wareegga bilowga ah iyo xasilloonida).
- Si gooni ah u faraxsan: ilo goobeed oo gooni ah (xakameyn dabacsan).
3. Mashiinka AC (Khamriga Beddelaya)
3.1 Qeexidda iyo Astaamaha
Mashiinka AC waa mashiin koronto oo ku shaqeeya koronto beddelan. Mashiinnada AC waxay xukumaan codsiyada warshadaha sababtoo ah waxay u muuqdaan inay ka fudud yihiin (gaar ahaan matoorada induction), ka xoog badan yihiin, waxayna u baahan yihiin dayactir yar. Mashiinnada AC guud ahaan waxay ku yimaadaan laba nooc oo waaweyn: mashiinno isku-dhafan iyo mashiinno induction (aan isku-dhafan ahayn).
3.2 Dhismaha Guud ee Mashiinka AC-ga
Qaybaha aasaasiga ah ee mashiinka AC waxa kale oo ka mid ah stator iyo rotor:
– Stator: wuxuu leeyahay gariirado saddex-waji ah (inta badan codsiyada warshadaha) kuwaas oo soo saara goob birlab ah oo wareegaysa.
– Rotor: nooca rotor-ku wuxuu ku xiran yahay nooca matoorka:
– Rotor-ka qafiska dabagaallaha ee matoorka induction-ka wuxuu ka kooban yahay baararka gudbiyaha oo si gaaban loogu wareejiyay oo leh faraantiyo.
– Rotor-ka nabarka ee matoorada induction-ka qaarkood wuxuu u oggolaanayaa in lagu daro iska caabinta dibadda.
– Rotor-ka cirifka (rotor-ka goobta) ee mashiinnada isku-dhafan (goobta rotor-ku waxay ka iman kartaa DC current ama magnet joogto ah).
3.3 Goobta Birlabta ee Wareegaysa
Astaamaha gaarka ah ee mashiinka AC-ga saddex-geesoodka ah waa awoodda stator-ka uu si dabiici ah u soo saaro goob birlabeed wareegta. Marka hadda saddex-geesoodka ah uu dhex maro gariiradaha stator-ka, goobta birlabku waxay ku wareegtaa xawaare gaar ah, oo loo yaqaan xawaare isku-dhafan:
\[
n_s = \frac{120 f}{P}
\]
Halkee:
– \( n_s \) = xawaare isku mid ah (rpm),
– \( f \) = soo noqnoqoshada (Hz),
– \( P \) = tirada tiirarka.
Xawaarahani wuxuu go'aamiyaa astaamaha aasaasiga ah ee matoorka AC.
4. Matoorka Soo-kicinta (Asynchronous)
4.1 Mabda'a Shaqada
Matoorada wax-soo-saarka waxay ku shaqeeyaan mabda'a wax-soo-saarka elektromagnetic-ka. Goobta stator-ka ee wareegaysa waxay dhex martaa hagayaasha rotor-ka, iyadoo soo saarta hadda la kiciyo oo ku jirta rotor-ka. Hadda rotor-kani wuxuu soo saaraa goob birlab ah oo rotor ah oo la falgasha goobta stator-ka, taasoo soo saarta xoog.
Rotor-ka matoorka induction-ka waligiis ma gaaro xawaare isku mid ah. Farqiga u dhexeeya xawaaraha rotor-ka iyo xawaaraha isku midka ah waxaa loo yaqaan simbiriirixan:
\[
s = \frac{n_s – n_r}{n_s}
\]
Simbiriirixan ayaa lagama maarmaan u ah in habka soo-kicinta uu sii socdo.
4.2 Faa'iidooyinka iyo Xaddidaadaha
Sareynta:
- Dhisme fudud oo adag,
- Dayactir yar,
– Qiimo yar, oo ku habboon warshadaha.
Keterbatasan:
- Xakamaynta xawaaraha ma aha mid fudud sida matoorka DC iyada oo aan lahayn qalab dheeraad ah,
– Bilaabidda hadda way weynaan kartaa (waxay u baahan tahay hab bilow gaar ah ama inverter/VFD).
5. Mashiinka Isku-dhafan
5.1 Mabda'a Shaqada
Mashiinka isku-dhafan, rotor-ku wuxuu ku wareegaa xawaare la mid ah kan garoonka wareega ee stator-ka. Rotor-ku wuxuu leeyahay goob birlab ah (laga bilaabo DC current ilaa giraangiraha simbiriirixan ama birlab joogto ah) oo "ku xira" goobta stator-ka.
5.2 Codsiyada
– Matoorada isku-dhafan (alternators) ee warshadaha korontada ayaa ah codsiyada ugu badan, sababtoo ah waxay soo saaraan danab AC oo deggan.
- Matoorada isku-dhafan waxaa loo isticmaalaa codsiyada u baahan xawaare joogto ah iyo hufnaan sare, iyo sidoo kale xoogga la hagaajin karo (gaar ahaan xakamaynta kicinta).
6. Isbarbardhigga Mashiinnada DC iyo AC
1. Isha iyo Wax soo saarka
– Mashiinnada DC: gelinta/soo-saarka DC, iyadoo la adeegsanayo qalab loogu talagalay hagaajinta farsamada.
– Mashiinnada AC: gelinta/soo-saarka AC, guud ahaan iyada oo aan lahayn commutator (marka laga reebo noocyo gaar ah).
2. Dayactirka
- DC: sare sababtoo ah xirashada burushka iyo qalabka korontada.
– AC (induction): hooseeya sababtoo ah ma isticmaalo burushyo (rotor-yada qafiska).
3. Xakamaynta Xawaaraha
– DC: goobo aad u fudud oo kala duwan.
– AC: aad u adag, laakiin hadda si weyn ayay u caawisay VFD/inverter.
4. Codsiga
- DC: gawaarida korontada qaarkood, qalabka u baahan xakamaynta xawaaraha/xawaaraha saxda ah (naqshado gaar ah), nidaamyada wadista ee dhaxalka ah.
– AC: matoorada warshadaha, bambooyinka, taageerayaasha, kombaresarada, korontada dhalinta (matoorada isku-dhafan).
7. Gunaanad
Mashiinnada DC iyo AC labaduba waxay isticmaalaan isdhexgalka goobaha birlabta iyo hirarka korontada, laakiin way ku kala duwan yihiin sida ay u soo saaraan xoogga, dhismaha, iyo astaamaha hawlgalka. Mashiinnada DC waxay ku fiican yihiin xakamaynta fudud, laakiin waxay u baahan yihiin dayactir dheeraad ah sababtoo ah matoorka iyo burushyada. Mashiinnada AC, gaar ahaan matoorada induction, waa laf-dhabarta warshadaha sababtoo ah fududaantooda, cimrigooda, iyo dhaqaalahooda. Fahmidda aasaaska labada nooc ee mashiin waa tallaabo lagama maarmaan ah ka hor inta aan la gelin mowduucyo horumarsan sida xakamaynta xawaaraha iyadoo la adeegsanayo qalabka wax lagu beddelo, nidaamyada wadista, iyo falanqaynta waxqabadka iyo hufnaanta mashiinnada korontada.
Haddii aad rabto, waxaan samayn karaa nooc farsamo oo dheeraad ah (oo leh sawirro fikradeed iyo tusaalooyin xisaabeed oo fudud) ama nooc fudud oo loogu talagalay ardayda xirfadaha/dugsiga sare.
