Enjaloinjini enamanqanaba amathathuingaqhagamshelwa ngoqhagamshelo lwenxantathu, oluhambelana nombane ophantsi; Ingaqhagamshelwa ngokwendlela yoqhagamshelo lweenkwenkwezi, oluhambelana nombane ophakamileyo; Umbane ophezulu uphindwe kathathu ingcambu yesikwere yombane ophantsi. Umzekelo, i-motor ye-380V enoqhagamshelo lwenxantathu, ukuba iqhagamshelwe ngoqhagamshelo lweenkwenkwezi, umbane ohambelanayo yi-660V. Uqhagamshelo oluthile kufuneka luhambelane nombane wombane.
Injini eqhagamshelwe inkwenkwezi ayivelisi ukujikeleza kwegazi ngaphakathi, nto leyo ingcono ngokwethiyori kunoqhagamshelo olunxantathu.
Ngenxa yokuba ukujija kwamanqanaba amathathu akunakulinganiswa ngokupheleleyo, kusoloko kukho umahluko omncinciImoto enezigaba ezi-3i-voltage, eya kwenza ukujikeleza ngaphakathi kunxantathu, nto leyo ekhokelela ekufudumaleni kwemoto kunye nokunciphisa ukusebenza kakuhle. Uqhagamshelo olunxantathu lwenziwa ngenxa yezizathu zembali, oko kukuthi, ukuqala okubizwa ngokuba yi-star-triangle start, ukuqala kwe-star-triangle kunokunciphisa ngempumelelo umsinga wokuqala, kodwa kuya kunciphisa i-torque yokuqala, ngoko ke ingasetyenziswa kuphela kwimeko yomthwalo omncinci okanye yokungabikho komthwalo.
Siyabona ukuba i-motor ye-fan pump ingaqaliswa yi-star-triangle, kodwa ngokuqinisekileyo akukho star-triangle start kwi-crane, ukuphakamisa kuqala ngokuxhathisa i-rotor series, kutheni le nto yenza ingxaki engaka, kukho isizathu. Kakade ke, iimeko zangoku zokuqalisa ukuguqulwa kwamaza zisombulule ngokupheleleyo iingxaki ezinjalo.
Nokuba inkqubo ye-three-wire okanye ye-four-wire (engenamhlaba), i-engile yombane phakathi kwe-three-phase voltages ngumahluko we-120 degrees phase phantsi kweemeko ezifanelekileyo. Kucingelwa ukuba ngenxa yokuphazamiseka okwethutyana, ii-3N harmonics zenziwa kwi-phase winding ye-load terminal, 3N*120=360N, nto leyo ebonisa ukuba i-three-phase 3N harmonic voltage phase iyafana, ukuba i-amplitude iyafana, ii-3N harmonics zamaqela amathathu e-line voltage ziya kucinywa ngokupheleleyo, oko kukuthi, akukho i-integer multiple harmonics ye-3 kwi-voltage phakathi kwemigca.
Kwikhonkco likanxantathu, imisinga ye-harmonic ye-3N engentla kwisigaba esifanayo ifinyezwa kwi-triangle kwaye igcinwa kule nxantathu ukuze yenze ukujikeleza okungapheliyo. Ke ngoko, ngenxa yokuba kukho ii-harmonics, uqhagamshelo lukanxantathu okanye lweenkwenkwezi lunokukhethwa ngokuxhomekeke ekubeni ii-harmonics ze-3N zinokwenzeka na kwi-voltage okanye kwi-current.
Ixesha leposi: Septemba-19-2024