Mai ba da na'urar mayar da martani ga makamashi don mai jujjuya mitar: Canjin mitar da aikin kayyade saurin mai sauya mitar shine canza wutar lantarki ta AC mai kashi uku (ko kowace wutar lantarki) tare da daidaitawar wutar lantarki da mitar zuwa wutar lantarki ta AC mai hawa uku. Wani lokaci, ana kuma kiran mai sauya mitar a matsayin na'urar mitar mitar mai canzawa VVVF. Ana amfani da shi sosai don daidaita saurin injin AC (asynchronous ko synchronous).
Tsarin daidaita saurin mitar motsin AC mai canzawa ya ƙunshi manyan sassa uku: mai sarrafa saurin mitar mai canzawa, direban AC, da mai sarrafawa. Maɓalli mai mahimmanci kayan aiki shine mai sauya mitar, wanda ake amfani dashi don cimma sauye-sauye masu sauƙi a cikin ƙarfin lantarki da mita.
Matsakaicin saurin saurin mitar mai canzawa ba zai iya kwatantawa da hanyoyin da suka gabata kamar ka'idar ƙarfin lantarki, ƙa'idodin saurin igiya mai canzawa, ƙa'idar saurin sauri, ƙa'idar saurin zamewa, da tsarin saurin haɗaɗɗiyar hydraulic dangane da kewayon mitar, daidaiton daidaito, inganci mai ƙarfi, ingantaccen tsarin, cikakkiyar ayyukan kariya, da sauƙin aiwatar da sarrafawa ta atomatik da sarrafa tsari. An san shi sosai azaman mafita mai sarrafa saurin sauri don injin AC, wanda ke wakiltar makomar ci gaban watsa wutar lantarki.
A cikin shekaru talatin da suka gabata, an yi amfani da ƙa'idodin saurin sauya mitar a masana'antu kamar ƙarfe, ƙarfe, man fetur, sinadarai, yadi, fiber sinadarai, masana'antar haske, yin takarda, roba, robobi, wutar lantarki, da sarrafa ruwa. Aiwatar da ƙa'idar saurin mitar mai canzawa don ƙananan ƙarfin lantarki ya zama sananne sosai kuma balagagge. Matsakaicin saurin saurin mitar manyan injinan lantarki shima ana samun kulawa kuma ana amfani dashi a hankali. Baya ga kyakkyawan aikin sarrafa saurin sa, tsarin saurin mitar motsi na AC shima yana taka rawar gani wajen ceton wutar lantarki da kare muhalli. Kyakkyawan na'urar sarrafa saurin sauri don canjin fasaha na kasuwanci da haɓaka samfura.
Tasirin ceton kuzari na mai sauya mitar akan fan da fanfo na ruwa
Akwai gagarumin gibin wutar lantarki saboda sabani tsakanin samar da wutar lantarki da bukatu (samar da wutar lantarki ya zarce bukata), kuma ana bukatar kiyaye makamashi. Bisa kididdigar da sassan da abin ya shafa suka yi, a shekarar 2002, karfin samar da wutar lantarki da kasar Sin ta yi ya kai kilowatt biliyan 31.9, inda ake samar da wutar lantarki a kowace shekara ya kai kilowatt biliyan 1346.6. Duk da cewa tana matsayi na biyu a duniya wajen ma'aunin wutar lantarki, yawan wutar lantarkin da ake amfani da shi na kowane mutum yana cikin mafi ƙanƙanta a duniya. Haka kuma, saurin bunkasuwar tattalin arzikin kasarmu yana bukatar karin wutar lantarki. Idan aka yi la'akari da bukatar karuwar tattalin arzikin kasa da kashi 8%, da karuwar wutar lantarki da kashi 11%, karfin wutar lantarkin kasar Sin ya kamata ya kasance tsakanin 570 zuwa 600 kW nan da shekarar 2010, tare da samar da wutar lantarki na shekara-shekara na 28000-2900 kWh. A lokacin bazara na shekara ta 2003, ci gaba da zazzafar yanayi ya haifar da ƙarancin wutar lantarki a wasu larduna da birane, wanda ya tilasta ɗaukar matakan raba wutar lantarki. Saboda nauyi mai nauyi akan grid ɗin wutar lantarki, tsarin wutar lantarki na gida ya faru. Bayanin da aka yi a sama ya nuna cewa wutar lantarki da bukatun kasar Sin ba su da daidaito, inda wadatar ke da kasa da bukatar. Saboda haka, wajibi ne a adana wutar lantarki.
Fa'idodin ceton makamashi na ƙa'idar saurin mitar mai canzawa ga masu fanfo da famfunan ruwa:
Jimillar karfin injinan lantarki da aka girka a kasar Sin ya kai kilowatt miliyan 450, wanda ke cinye kusan kashi 65% na wutar lantarkin kasar. Sabili da haka, yana da matukar mahimmanci don cimma nasarar ceton wutar lantarki don motocin lantarki. Akwai hanyoyi guda biyu don adana makamashi don manyan injina: ɗaya shine inganta ingantaccen injin da kansa don cimma ingantaccen aiki na dogon lokaci, galibi ana amfani da injin ɗin sauri akai-akai; Wani kuma shine don inganta daidaiton sarrafa saurin mota, ta yadda motar zata iya aiki a mafi girman saurin kuzari.
Fans, famfunan ruwa, da kwampreso, ana amfani da kayan aikin lantarki da yawa a cikin tattalin arzikin ƙasa, wanda jimlar injin ɗin ya kai miliyan 150 da kuma amfani da wutar lantarki kusan kashi 35% na wutar lantarkin ƙasar. Kimanin kashi 20% zuwa 30% na fanfo da famfunan ruwa suna buƙatar tsarin saurin gudu.
Motar mitar mai canzawa shine zaɓi na zaɓin tanadin makamashi don magoya baya da famfunan ruwa. Bisa ga ka'idar ruwa, ikon shaft na famfon fan na centrifugal aiki ne mai cubic na saurin juyawa. Lokacin da saurin ya ragu, amfani da wutar lantarki zai ragu sosai, alal misali, a 50% gudun, ƙarfin injin na shaft shine kawai 12.5%. Tabbas, ingantaccen tsarin tsarin tsarin saurin ya bambanta sosai, kuma ingancin na'urorin sarrafa saurin hydraulic bayan zamewa bai yi girma ba, η≈ (1-S) ， A 50% saurin juyawa, ηvs≈50% ηvvvF≈95%～98%, Kuma ya kasance kusan baya canzawa.