Uyini umehluko phakathi kwe-inverter overload kanye ne-overcurrent?Ukulayisha ngokweqile umqondo wesikhathi, okusho ukuthi umthwalo weqa umthwalo olinganiselwe ngokuphindaphinda okuthile ngesikhathi esiqhubekayo.Umqondo obaluleke kakhulu wokulayisha ngokweqile isikhathi esiqhubekayo.Isibonelo, umthamo wokulayisha ngokweqile we-converter frequency ngu-160% ngomzuzu owodwa, okungukuthi, ayikho inkinga ukuthi umthwalo ufinyelela izikhathi ezingu-1.6 zomthwalo olinganiselwe ngomzuzu owodwa ngokuqhubekayo.Uma umthwalo uba mncane ngokuzumayo kumasekhondi angu-59, i-alamu yokulayisha ngokweqile ngeke icushwe.Kuphela ngemva kwamasekhondi angu-60, i-alamu yokulayishwa ngokweqile izocushwa.I-Overcurrent umqondo wobuningi, obhekisela ekutheni umthwalo udlula kangaki umthwalo olinganiselwe.Isikhathi se-overcurrent sifushane kakhulu, futhi ukuphindaphinda kukhulu kakhulu, ngokuvamile izikhathi ezingaphezu kweziyishumi noma ngisho namashumi amabili.Isibonelo, lapho i-motor isebenza, i-shaft mechanical ivinjelwe ngokuzumayo, khona-ke i-current motor izokhuphuka ngokushesha ngesikhathi esifushane, okuholela ekuhlulekeni kwe-overcurrent.
Ukweqisa kwamanje kanye nokulayisha ngokweqile amaphutha ajwayelekile eziguquli zefrikhwensi.Ukuze uhlukanise ukuthi isiguquli semvamisa siyakhubeka noma silayisha ngokweqile, kufanele siqale sicacise umehluko phakathi kwakho.Ngokuvamile, ukulayishwa ngokweqile kufanele futhi kube ngokwedlulele, kodwa kungani isiguquli sefrikhwensi kufanele sihlukanise okwamanje nokulayisha ngokweqile?Kukhona umehluko oyinhloko emibili: (1) izinto ezihlukene zokuvikela I-Overcurrent isetshenziselwa ikakhulukazi ukuvikela isiguquli semvamisa, kuyilapho ukulayisha ngokweqile kusetshenziswa ikakhulukazi ukuvikela injini.Ngenxa yokuthi amandla okuguqula imvamisa kwesinye isikhathi adinga ukunyuswa ngegiya elilodwa noma amagiya amabili kunomthamo wemoto, kulokhu, lapho injini igcwele ngokweqile, isiguquli semvamisa asikho isidingo sokudlula.Ukuvikela ukulayisha ngokweqile kwenziwa umsebenzi wokuvikela ukushisa okushisayo kwe-elekthronikhi ngaphakathi kwesiguquli sefrikhwensi.Lapho umsebenzi wokuvikela ukufudumala kwe-elekthronikhi uhlelwa kusengaphambili, “isilinganiso sokusetshenziswa kwamanje” kufanele sisethwe kusengaphambili ngokunembile, okungukuthi, iphesenti lesilinganiso samanje esilinganiselwe semoto kuya kumanje olinganiselwe wesiguquli semvamisa: IM%=IMN*100 %I/IM Lapho, im%-isilinganiso sokusetshenziswa kwamanje;I-IMN—isilinganiso samanje semoto, a;IN— izilinganiso zamanje zesiguquli sefrikhwensi, a.(2) Izinga lokushintsha lamanje lihlukile Ukuvikelwa kokulayishwa ngokweqile kwenzeka kwinqubo yokusebenza yemishini yokukhiqiza, futhi izinga lokushintsha le-di/dt yamanje ngokuvamile lincane;I-overcurrent ngaphandle kokulayisha ngokweqile kuvame ukuzuma, futhi izinga lokushintsha le-di/dt yamanje livame ukuba likhulu.(3) Ukuvikela ukugcwala ngokweqile kunesici sesikhathi esiphambene.Ukuvikela ukulayisha ngokweqile kuvimbela injini ukuthi ingashisi ngokweqile, ngakho inezici "zomkhawulo wesikhathi ophambene" ezifana ne-thermal relay.Okusho ukuthi, uma kungengaphezu kwesilinganiso samanje, isikhathi esivumelekile sokusebenza singaba side, kodwa uma singaphezulu, isikhathi sokusebenza esivumelekile sizofinyezwa.Ngaphezu kwalokho, njengoba imvamisa iyancipha, ukuchithwa kokushisa kwemoto kuba kubi kakhulu.Ngakho-ke, ngaphansi kokugcwala okufanayo okungama-50%, imvamisa ephansi, isikhathi sokusebenza esivumelekile siba sifushane.
Uhambo oludlulela phambili lwesiguquli se-frequency Ukukhubeka ngaphezulu kwamanje kwe-inverter kuhlukaniswe ngephutha lesifunda esifushane, ukukhubeka ngesikhathi sokusebenza nokukhubeka ngesikhathi sokusheshisa nokwehla, njll. 1, iphutha lesekethe emfushane: (1) Izici zephutha (a) Uhambo lokuqala lungenzeka. ngesikhathi sokusebenza, kodwa uma iqalwa kabusha ngemva kokusetha kabusha, izovame ukukhubeka ngokushesha nje lapho isivinini sikhuphuka.(b) Ine-surge current enkulu, kodwa iziguquli eziningi zefrikhwensi zikwazile ukwenza ukuvikela ukukhubeka ngaphandle kokulimala.Ngenxa yokuthi ukuvikeleka kuhamba ngokushesha okukhulu, kunzima ukuqaphela okwamanje.(2) Ukwahlulela nokuphatha Isinyathelo sokuqala siwukwahlulela ukuthi kukhona yini umjikelezo omfushane.Ukuze kube lula ukwahlulela, i-voltmeter ingaxhunywa ohlangothini lokokufaka ngemva kokusetha kabusha nangaphambi kokuqala kabusha.Uma uqala kabusha, i-potentiometer izophenduka kancane kancane isuka ku-zero, futhi ngesikhathi esifanayo, qaphela i-voltmeter.Uma imvamisa yokuphuma kwesiguquli sihamba ngokushesha nje lapho sikhuphuka, futhi isikhombi se-voltmeter sibonisa izimpawu zokubuyela ku-“0” khona manjalo, kusho ukuthi ukuphela kokuphumayo kwesiguquli kufinyeziwe noma kusekelwe phansi.Isinyathelo sesibili ukwahlulela ukuthi i-inverter ifushane ngaphakathi noma ngaphandle.Ngalesi sikhathi, ukuxhumana ekugcineni kokuphuma kwe-converter frequency kufanele kunqanyulwe, bese i-potentiometer kufanele iguqulwe ukuze kwandiswe imvamisa.Uma isahamba, kusho ukuthi isiguquli sefrikhwensi sifushane;Uma ingaphinde ikhubeke, kusho ukuthi kunomjikelezo omfushane ngaphandle kwesiguquli samafrikhwensi.Hlola umugqa osuka kusiguquli sefrikhwensi uye enjini kanye nenjini ngokwayo.2, umthwalo wokukhanya oweqile ulula kakhulu, kodwa ukukhubeka okudlulele: Lesi yisenzakalo esiyingqayizivele sokulawulwa kwesivinini esishintshashintshayo.Kumodi yokulawula ye-V/F, kunenkinga egqame kakhulu: ukungazinzi kwesistimu ye-motor magnetic circuit ngesikhathi sokusebenza.Isizathu esiyisisekelo sikhona: Uma ugijima ngemvamisa ephansi, ukuze ushayele umthwalo osindayo, isinxephezelo se-torque sivame ukudingeka (okungukuthi, ukuthuthukisa isilinganiso se-U / f, esibizwa nangokuthi i-torque boost).Idigri ye-saturation yesekethe kazibuthe yemoto iyashintsha ngomthwalo.Lolu hambo lwamanje olubangelwa ukugcwala kwesekethe kazibuthe yemoto ikakhulukazi lwenzeka kumafrikhwensi aphansi kanye nomthwalo omncane.Isixazululo: Lungisa isilinganiso se-U/f ngokuphindaphindiwe.I-3, i-overload overload: (1) Iphutha elenzeka Eminye imishini yokukhiqiza ikhuphula umthwalo kungazelelwe ngesikhathi sokusebenza, noma “ibambeke”.Ijubane lemoto lehla kakhulu ngenxa yokunganyakazi kwebhande, ukwanda kwamanje kakhulu, futhi ukuvikelwa kokulayisha ngokweqile kuphuze kakhulu ukwenza, okuholela ekukhubekeni ngokweqile.(2) Isixazululo (a) Okokuqala, thola ukuthi umshini ngokwawo unephutha, futhi uma unephutha, lungisa umshini.(b) Uma lokhu kulayisha ngokweqile kuyinto evamile ohlelweni lokukhiqiza, qala ngokucabangela ukuthi isilinganiso sokudlulisa phakathi kwenjini nomthwalo singanyuswa yini?Ukwandisa ngokufanelekile isilinganiso sokudlulisa kunganciphisa i-torque yokumelana ku-motor shaft futhi kugweme isimo sokunganyakazi kwebhande.Uma isilinganiso sokudlulisa singakwazi ukunyuswa, umthamo we-motor kanye ne-frequency converter kufanele ukhuliswe.4. Ukweqisa ngesikhathi sokusheshisa noma ukwehla: Lokhu kubangelwa ukusheshisa kakhulu noma ukwehla, futhi izinyathelo ezingathathwa zimi kanje: (1) Nweba isikhathi sokusheshisa (ukunciphisa).Okokuqala, qonda ukuthi kuvunyelwe yini ukunweba isikhathi sokusheshisa noma sokunciphisa ngokwezidingo zenqubo yokukhiqiza.Uma kuvunyelwe, kunganwetshwa.(2) Ukubikezela ngokunembile umsebenzi wokusheshisa (ukunciphisa) ukuzelapha (ukuvimbela i-stall) Umsebenzi we-inverter unomsebenzi wokuzilapha (ukuvimbela i-stall) we-overcurrent ngesikhathi sokusheshisa nokunciphisa.Lapho i-curring (ewayo) yamanje idlula umkhawulo wamanje osethiwe ongenhla, ijubane elikhuphukayo (eliwayo) lizomiswa, bese ijubane elikhuphukayo (eliwayo) lizoqhubeka lapho lamanje lehla ngaphansi kwenani elimisiwe.
Uhambo lokulayisha ngokweqile lwesiguquli se-frequency Injini ingajikeleza, kodwa amandla asebenzayo adlula inani elilinganiselwe, elibizwa ngokuthi ukulayisha ngokweqile.Ukusabela okuyisisekelo komthwalo omningi ukuthi nakuba i-current idlula inani elilinganiselwe, ubukhulu bokweqisa abukho bukhulu, futhi ngokuvamile abukhi umthelela wamanje omkhulu.1, isizathu esiyinhloko sokugcwala ngokweqile (1) Umthwalo wemishini usinda kakhulu.Isici esiyinhloko sokulayisha ngokweqile ukuthi injini ikhiqiza ukushisa, okungatholakala ngokufunda ukusebenza kwamanje esikrinini sokubonisa.(2) I-voltage engalingani yezigaba ezintathu ibangela ukuthi ukusebenza kwamanje kwesigaba esithile kube kukhulu kakhulu, okuholela ekukhubekeni kokulayisha ngokweqile, okubonakala ngokushisisa okungalingani kwemoto, okungenzeka kungatholakali lapho kufundwa amandla asebenzayo esibukweni. isikrini (ngoba isikrini sokubonisa sibonisa isigaba samanje kuphela).(3) Ukusebenzisa kabi, ingxenye yamanje yokuthola ngaphakathi kwe-inverter iyahluleka, futhi isignali yamanje etholiwe inkulu kakhulu, okuholela ekukhubekeni.2. Indlela yokuhlola (1) Hlola ukuthi injini iyashisa yini.Uma ukukhuphuka kwezinga lokushisa kwe-motor kungephezulu, okokuqala, hlola ukuthi umsebenzi wokuvikela i-electronic thermal we-converter ye-frequency uhlelwe kahle yini.Uma isiguquli sefrikhwensi sisenemali eningi, inani elimisiwe lomsebenzi wokuvikela ukufudumala kwe-elekthronikhi kufanele lixegiswe.Uma ukunyuka kwezinga lokushisa kwe-motor kuphezulu kakhulu futhi ukugcwala ngokweqile kuvamile, kusho ukuthi i-motor igcwele kakhulu.Ngalesi sikhathi, kufanele siqale sandise isilinganiso sokudlulisela ngendlela efanele ukuze sinciphise umthwalo ku-motor shaft.Uma inganyuswa, khulisa isilinganiso sokudlulisela.Uma isilinganiso sokudlulisa singakwazi ukunyuswa, umthamo wemoto kufanele ukhuliswe.(2) Hlola ukuthi i-voltage enezigaba ezintathu ohlangothini lwemoto ibhalansile yini.Uma i-voltage yezigaba ezintathu ohlangothini lwemoto ingalingani, hlola ukuthi ingabe i-voltage yezigaba ezintathu ekugcineni kokuphumayo kwesiguquli se-frequency ibhalansisiwe.Uma futhi ingalingani, inkinga ingaphakathi kwesiguquli semvamisa.Uma i-voltage ekugcineni kokuphuma kwesiguquli se-frequency ilinganisela, inkinga ilele emgqeni osuka kusiguquli semvamisa ukuya kumotho.Hlola ukuthi izikulufu zawo wonke amatheminali ziqinisiwe yini.Uma kukhona abathintwayo noma ezinye izinto zikagesi phakathi kwesiguquli sefrikhwensi kanye nenjini, hlola ukuthi amatheminali ezinto zikagesi ezifanele ziyaqiniswa yini nokuthi izimo zokuthintana zoxhumana nabo zilungile yini.Uma i-voltage yezigaba ezintathu ohlangothini lwe-motor ilinganisela, kufanele wazi imvamisa yokusebenza lapho ukhubeka: Uma imvamisa yokusebenza iphansi futhi isilawuli se-vector (noma kungabikho isilawuli se-vector) sisetshenziswa, isilinganiso se-U/f kufanele sincishiswe kuqala.Uma umthwalo usengaqhutshwa ngemva kokunciphisa, kusho ukuthi isilinganiso sokuqala se-U / f siphezulu kakhulu futhi inani eliphakeme le-excitation current likhulu kakhulu, ngakho-ke lamanje lingancishiswa ngokunciphisa isilinganiso se-U / f.Uma kungekho mthwalo omisiwe ngemva kokunciphisa, kufanele sicabangele ukwandisa umthamo we-inverter;Uma i-inverter inomsebenzi wokulawula i-vector, imodi yokulawula i-vector kufanele yamukelwe.
Umshwana wokuzihlangula: Le ndatshana ikhiqizwa kabusha kunethiwekhi, futhi okuqukethwe yi-athikili okokufunda nokuxhumana kuphela.Inethiwekhi ye-compressor yomoya ayithathi hlangothi ekubukeni okuku-athikili.I-copyright ye-athikili ingeyombhali wokuqala kanye nenkundla.Uma kukhona ukwephulwa komthetho, sicela uthinte ukuze ukususe.