Mai samar da na'ura mai jujjuya birki na mitar yana tunatar da ku cewa mai sauya mitar yana sanye da wani juzu'i mai ƙarfi musamman don cinye wani ɓangaren makamashi akan capacitor bas na DC ta hanyar birki ta birki, don guje wa wuce gona da iri na capacitor. A ka'idar, idan capacitor yana adana makamashi mai yawa, ana iya amfani da shi don sakin shi don tuki mota da kuma guje wa sharar makamashi. Duk da haka, ƙarfin capacitor yana da iyaka, kuma ƙarfin jurewarsa shima yana da iyaka. Lokacin da wutar lantarki na capacitor bas ya kai wani matakin, yana iya lalata capacitor, wasu kuma na iya lalata IGBT. Don haka, ya zama dole a saki wutar lantarki ta hanyar birki resistor a kan lokaci. Wannan sakin ɓata lokaci ne kuma mafita ce da ba za a iya gujewa ba.
Capacitor bas yanki ne mai ɗaukar nauyi wanda zai iya ɗaukar iyakataccen makamashi
Bayan an gyara duk wutar lantarki mai kashi uku na AC kuma an haɗa su zuwa capacitors, ƙarfin wutar lantarki na bas ɗin na yau da kullun yayin aikin cikakken kaya yana kusan sau 1.35, 380 * 1.35=513 volts. Wannan ƙarfin lantarki zai iya canzawa a zahiri a ainihin lokacin, amma mafi ƙarancin ba zai iya zama ƙasa da 480 volts ba, in ba haka ba zai haifar da kariyar ƙararrawa mara ƙarfi. Bas capacitors gabaɗaya sun ƙunshi saiti biyu na 450V electrolytic capacitors da aka haɗa a jere, tare da ƙarfin juriya na ka'idar 900V. Idan wutar lantarkin motar bas ta zarce wannan darajar, capacitor zai fashe kai tsaye, don haka wutar lantarkin bas ɗin ba zai iya kaiwa irin wannan babban ƙarfin 900V komai ba.
A gaskiya ma, jurewar ƙimar ƙarfin lantarki na IGBT tare da shigarwar 380 volt na kashi uku shine 1200 volts, wanda sau da yawa yana buƙatar aiki a cikin 800 volts. Idan aka yi la'akari da cewa idan ƙarfin lantarki ya karu, za a sami matsalar rashin aiki, wato, idan ka yi gaggawar yin aikin birki, ƙarfin motar bas ba zai ragu da sauri ba. Don haka, yawancin masu sauya mitar an ƙirƙira su don fara aiki a kusan 700 volts ta hanyar birki don rage ƙarfin motar bas da guje wa ƙarin cajin sama.
Don haka jigon zayyana resistors na birki shine a yi la’akari da juriyar ƙarfin wutar lantarki na capacitors da IGBT modules, don gujewa waɗannan mahimman abubuwa guda biyu daga lalacewa ta hanyar babban ƙarfin motar bas. Idan waɗannan nau'ikan abubuwan biyu sun lalace, mai sauya mitar ba zai yi aiki da kyau ba.
Yin kiliya da sauri yana buƙatar resistor na birki, kuma saurin gaggawa shima yana buƙatar sa
Dalilin da yasa wutar lantarkin bas na mai sauya mitar ke ƙaruwa shine sau da yawa saboda mai canza mitar da ke haifar da motar yin aiki a cikin yanayin birki na lantarki, yana barin IGBT ya wuce ta wani tsarin tafiyarwa, yana amfani da babban injin inductance na injin wanda ba zai iya canzawa kwatsam ba, kuma nan take yana haifar da babban ƙarfin lantarki don cajin capacitor bas. A wannan lokacin, motar tana saurin rage gudu. Idan resistor ba ta cinye makamashin bas a kan lokaci a wannan lokaci, wutar lantarkin motar bas za ta ci gaba da hauhawa, wanda ke haifar da barazana ga amincin mai sauya mitar.
Idan kaya ba shi da nauyi sosai kuma babu buƙatar tsayawa da sauri, babu buƙatar amfani da resistor birki a cikin wannan halin. Ko da ka shigar da birki, ba za a kunna wutar lantarki mai aiki na naúrar birki ba, kuma ba za a shigar da resistor ɗin aiki ba.
Baya ga buƙatar ƙara juriya da naúrar birki don saurin birki a cikin yanayin rage nauyi mai nauyi, a haƙiƙa, idan ya dace da buƙatun nauyi mai nauyi da lokacin farawa sosai, naúrar birki da juriyar birki suma suna buƙatar daidaitawa don farawa. A baya, na yi ƙoƙarin yin amfani da na'urar canza mitar don tuƙi na'urar buga nau'i na musamman, kuma an tsara lokacin saurin mitar ya zama 0.1 seconds. A wannan lokacin, lokacin farawa da cikakken nauyi, kodayake nauyin ba ya da nauyi sosai, saboda lokacin hanzari ya yi guntu, jujjuyawar wutar lantarki na bas yana da tsanani sosai, kuma zazzagewar wuta ko yanayi na iya faruwa. Daga baya, an ƙara naúrar birki ta waje da juriyar birki, kuma mai sauya mitar na iya aiki akai-akai. A cikin bincike, saboda lokacin farawa ya yi guntu sosai, kuma wutar lantarki na capacitor bas nan take. Mai gyara nan take yana cajin babban halin yanzu, yana haifar da ƙarfin wutar bas ɗin ya ƙaru ba zato ba tsammani. Wannan yana haifar da matsanancin juzu'in wutar lantarki akan bas ɗin, wanda zai iya wuce volts 700 nan take. Tare da ƙari na resistor na birki, ana iya kawar da wannan babban ƙarfin wutar lantarki a kan lokaci, yana barin mai sauya mitar yayi aiki akai-akai.
Har ila yau, akwai yanayi na musamman a cikin sarrafa vector, inda karfin juzu'i da hanyoyin saurin motar ke gaba, ko kuma lokacin aiki da saurin sifili tare da fitowar karfin 100%. Misali, lokacin da crane ya sauke wani abu mai nauyi kuma ya tsaya a tsakiyar iska, ko lokacin da ake juyawa, ana buƙatar sarrafa juzu'i. Motar tana buƙatar yin aiki a cikin jihar janareta, kuma ci gaba da halin yanzu za a dawo da cajin cikin capacitor na bas. Ta hanyar resistor na birki, ana iya amfani da wannan makamashi a kan lokaci don kiyaye daidaito da kwanciyar hankali na wutar lantarkin bas.
Yawancin ƙananan masu sauya mitar mitoci, irin su 3.7KW, galibi suna da ingantattun na'urorin birki da masu birki, mai yiwuwa saboda la'akari da rage ƙarfin bas, yayin da masu ƙarancin wuta da na'urorin birki ba su da tsada.