Momwe Magalimoto Amagetsi Amagwirira Ntchito
Mota yamagetsi ndi chipangizo chomwe chimasintha mphamvu zamagetsi kukhala mphamvu yamakina munjira yozungulira. Ukadaulo uwu ndi maziko a zida zosiyanasiyana zamakono, kuyambira mafani ndi mapampu amadzi mpaka makina a fakitale komanso magalimoto amagetsi. Kumvetsetsa mfundo zogwirira ntchito zamagalimoto amagetsi ndikofunikira osati kwa ophunzira aukadaulo okha komanso kwa aliyense amene akufuna kumvetsetsa momwe zida zomwe zili pafupi nafe zingagwirire ntchito pamagetsi okha. Nkhaniyi ikufotokoza mwachidule koma mokwanira mfundo zoyambira, zigawo zazikulu, ndi momwe magalimoto amagetsi amagwirira ntchito.
1. Lingaliro Loyambira: Mphamvu ya Magetsi
Mfundo yaikulu ya mota yamagetsi imachokera ku mgwirizano pakati pa magetsi ndi maginito. Pamene magetsi amayenda kudzera mu kondakitala (monga waya) mkati mwa mphamvu ya maginito, kondakitala amakumana ndi mphamvu. Chochitika ichi chimadziwika kuti mphamvu ya Lorentz. Kulunjika kwa mphamvu yochokera ku mphamvu kumadalira komwe mphamvu yamagetsi ikupita komanso komwe mphamvu ya maginito ikupita. Mu mota yamagetsi, mphamvu iyi imagwiritsidwa ntchito kupanga torque (kutembenuza nthawi) kuti rotor izungulire.
Mwachidule, mota yamagetsi "imakakamiza" gawo lozungulira (rotor) kuti lipitirize kuyenda chifukwa cha kusinthasintha kwa maginito kukankhira ndi kukoka. Kusinthaku kumayendetsedwa kuti kuzungulira kusayime pamalo amodzi koma kupitirire.
2. Zigawo Zazikulu za Mota Yamagetsi
Ngakhale pali mitundu yambiri ya ma mota amagetsi, kapangidwe kake koyambira kamakhala ndi zinthu zotsatirazi:
1. Stator
Stator ndi gawo losasuntha la mota. Ntchito yake ndi kupanga mphamvu ya maginito. Mu mota zina, mphamvu ya maginito ya stator imapangidwa ndi maginito okhazikika, koma mu zina, stator imagwiritsa ntchito coil yonyamula magetsi kuti ipange mphamvu ya maginito.
2. Rotor (Zopangira)
Rotor ndi gawo lozungulira. Rotor nthawi zambiri imakhala ndi ma coil kapena maginito omwe amalumikizana ndi mphamvu ya maginito ya stator. Pamene kulumikizanaku kumapanga mphamvu, rotor imazungulira pa shaft.
3. Koyilo (Yopindika)
Choko ndi choko cha waya chomwe chimanyamula magetsi. Ma windings amatha kupezeka mu stator kapena rotor, kutengera mtundu wa mota. Ma coil awa amagwira ntchito yayikulu popanga mphamvu ya maginito ndi torque.
4. Gwero la Mphamvu ndi Dongosolo Lolamulira
Gwero la mphamvu likhoza kukhala mphamvu yamagetsi yolunjika (DC) kapena mphamvu yamagetsi yosinthasintha (AC). Ma mota amakono, makamaka ma mota amakampani ndi magalimoto amagetsi, amagwiritsa ntchito zowongolera monga ma inverter kapena madalaivala kuti azilamulira ma frequency, voltage, ndi current, zomwe zimathandiza kuti liwiro ndi torque zizilamulira.
5. Ma commutator ndi maburashi (pa ma DC motors ena)
Mu mota ya DC yopukutidwa ndi burashi, commutator ndi maburashi nthawi ndi nthawi amatembenuza njira ya mphamvu mu rotor coils kuti asunge torque yolunjika ndikukhala ndi kuzungulira kosalekeza. Mu mota yopanda burashi, ntchito yosinthira iyi imasinthidwa ndi magetsi amagetsi.
6. Mabeya ndi Nyumba
Mabearing amathandiza kuti rotor izizungulira popanda kukangana kwambiri, pomwe nyumba ya injini imateteza zinthu zomwe zili mkati ndipo imathandiza kuti kutentha kusatayike.
3. Mfundo Yogwirira Ntchito ya DC (Direct Current) Motor
Mota ya DC ndi imodzi mwa mitundu yosavuta kumvetsetsa ya mota chifukwa lingaliro lake ndi losavuta kumva. Pamene magetsi a DC agwiritsidwa ntchito, mphamvu yamagetsi imadutsa mu ma rotor coils, omwe ali mkati mwa mphamvu ya maginito ya stator. Izi zimapangitsa kuti mphamvu ya Lorentz igwire ntchito mbali zotsutsana za ma coils, ndikupanga torque. Rotor imayamba kuzungulira.
Komabe, pali vuto: ngati njira yamagetsi mu ma coil ikhalabe yofanana, rotor imayima ikafika pamalo enaake chifukwa mphamvu yomwe imabwera ikhoza kukhala zero ("malo oyenera"). Apa ndi pomwe commutator imalowa. Commutator imasinthira njira yamagetsi mu ma coils nthawi iliyonse ikasintha theka. Kutembenuka kumeneku kumasunga njira yamagetsi yokhazikika, kulola rotor kupitiliza kuzungulira.
Ma mota a DC ali ndi ubwino wowongolera liwiro mosavuta. Liwiro likhoza kulamulidwa mwa kusintha mphamvu ya magetsi, pomwe mphamvu ya magetsi imakhudzana ndi mphamvu yamagetsi. Chifukwa cha makhalidwe amenewa, ma mota a DC amagwiritsidwa ntchito kwambiri m'magwiritsidwe ntchito omwe amafunikira mphamvu yamagetsi, monga zipangizo zina zamagetsi, ma mota a zoseweretsa, kapena ma mota ang'onoang'ono.
4. Mfundo Yogwirira Ntchito ya AC (Alternating Current) Motor
Ma mota a AC amagwira ntchito motsatira mfundo ya mphamvu ya maginito yozungulira. Mwachitsanzo, mu mota yolowetsa magawo atatu, stator ili ndi ma coil atatu omwe amaperekedwa ndi mphamvu ya AC yokhala ndi kusiyana kwa magawo a madigiri 120. Kusiyana kwa magawo kumeneku kumapangitsa kuti mphamvu ya maginito yopangidwa ndi stator iwoneke ngati ikuzungulira mozungulira mzere wa mota.
Mphamvu ya maginito yozungulira ya stator kenako "imakoka" rotor kuti izungulirenso. Mu ma induction motors, rotor nthawi zambiri imakhala ngati khola la agologolo, lopangidwa ndi mipiringidzo yolumikizana mbali zonse ziwiri. Pamene mphamvu ya maginito yozungulira imadutsa mu rotor, mphamvu yamagetsi yoyambitsidwa imayambitsidwa mu mipiringidzo yozungulira (malinga ndi lamulo la Faraday la induction yamagetsi). Mphamvu yamagetsi yoyambitsidwa iyi imapanga mphamvu yamagetsi ya rotor yomwe imagwirizana ndi stator field, ndikupanga torque.
Chinthu chosangalatsa chokhudza ma induction motors ndichakuti rotor simazungulira liwiro lomwelo ndi mphamvu ya maginito ya stator. Kusiyana kwa liwiro kumeneku kumatchedwa slip, ndipo slip ndi yofunika kuti induction ichitike. Ma induction motors amadziwika kuti ndi olimba, osavuta, komanso osasamalidwa bwino chifukwa sagwiritsa ntchito maburashi kapena makina oyendera.
Kupatula ma induction motors, palinso ma synchronous motors. Mu synchronous motor, rotor imazungulira molondola pa liwiro la mphamvu ya maginito ya stator. Rotor ikhoza kukhala maginito okhazikika kapena electromagnet. Ma synchronous motors amagwiritsidwa ntchito kwambiri komwe kumafunika mphamvu zambiri komanso kuwongolera molondola, kuphatikizapo ntchito zina zamafakitale ndi magalimoto amagetsi.
5. Zinthu Zomwe Zimakhudza Liwiro ndi Mphamvu
Liwiro lozungulira la mota yamagetsi ndi mphamvu yake zimakhudzidwa ndi zinthu zingapo zazikulu:
– Voltage ndi mphamvu yamagetsi: Mu ma DC motors, mphamvu yamagetsi imakhudza liwiro, pomwe mphamvu yamagetsi imakhudza mphamvu yamagetsi. Mu ma AC motors, mphamvu yamagetsi ndi mphamvu yamagetsi zimakhalabe ndi gawo koma nthawi zambiri zimayendetsedwa ndi inverter.
– Mafupipafupi: Mu ma mota a AC, liwiro la mphamvu ya maginito ya stator limadalira mafupipafupi a magetsi. Chifukwa chake, kuwongolera mafupipafupi ndiyo njira yayikulu yowongolera liwiro la mota ya AC.
– Chiwerengero cha ma poles: Mu ma AC motors, ma poles ambiri a stator, liwiro lofanana limachepa.
– Katundu wa makina: Katundu akachuluka, mphamvu ya injini imakwera. Mu ma induction motors, katundu wowonjezeka umakonda kutsika kwambiri.
– Kapangidwe ndi zipangizo: Ubwino wa zinthu zamaginito, kapangidwe ka coil, ndi makina oziziritsira zimakhudza magwiridwe antchito ndi magwiridwe antchito.
6. Kugwira Ntchito Bwino ndi Kutaya Mphamvu
Si mphamvu zonse zamagetsi zomwe zimabwera zomwe zimasanduka mphamvu yamakina. Zina zimatayika mu mawonekedwe a:
- Kutayika kwa mkuwa chifukwa cha kukana kwa coil komwe kumabweretsa kutentha.
- Kutayika kwa chitsulo chifukwa cha hysteresis ndi mafunde a eddy.
- Kutayika kwa makina chifukwa cha kukangana kwa mabearing ndi kukana mpweya.
- Zotayika zina chifukwa cha zolakwika pakupanga ndi ma harmonics mu dongosolo lowongolera.
Injini yabwino imapangidwa kuti ichepetse kutayika kumeneku, mwachitsanzo pogwiritsa ntchito waya wabwino kwambiri wamkuwa, core lamination kuti ichepetse mafunde a eddy, komanso makina opumira mpweya kapena ozizira.
7. Mapeto
Mfundo yogwirira ntchito ya mota yamagetsi kwenikweni ndi kuyanjana kwa magetsi ndi mphamvu ya maginito kuti apange mphamvu yamagetsi ndi kayendedwe kozungulira. Stator imapanga mphamvu yamagetsi, rotor imayankha ku mphamvuyo, ndipo njira yosinthira mphamvu—kaya yamakina mu mota za DC zopukutidwa kapena zamagetsi mu mota zamakono—imasunga mphamvu yamagetsi yomwe imasunga rotor ikuyenda mosalekeza. Ma mota a AC amadalira mphamvu yamagetsi yozungulira, pomwe ma mota a DC amadalira kwambiri kutembenuka kwa mphamvu yamagetsi mu ma coil.
Mwa kumvetsetsa malingaliro a mphamvu ya Lorentz, kulowetsa kwa maginito, ndi ntchito za zigawo zazikulu monga stator, rotor, ndi controller, titha kuwona kuti ma motors amagetsi ndi ochulukirapo kuposa "zipangizo zozungulira," koma ndi uinjiniya wamagetsi wogwira ntchito bwino womwe ndi wofunikira kwambiri pa moyo wamakono. Ngati mukufuna kufufuza mozama, gawo lotsatira ndikuphunzira za mitundu inayake ya ma motors—monga ma induction motors, ma synchronous motors, ndi ma brushless motors—ndi momwe mungawongolere liwiro lawo pogwiritsa ntchito inverter kapena electronic driver.
