Umhlinzeki weyunithi ye-frequency converter braking ukukhumbuza ukuthi uma kuqhathaniswa nokulawulwa kwesekethe kagesi evamile, okuqukethwe kobuchwepheshe kwesiguquli sefrikhwensi kuphezulu kakhulu. Kuyidivayisi ehlanganisa ugesi onamandla nobuthakathaka, ngakho-ke amaphutha ayo ahlukahlukene. Ngokuhlanganisa ulwazi lwethiyori nokuzijwayeza kuphela lapho singafingqa ulwazi ngokuqhubekayo. Ngezansi imibuzo eyi-15 ejwayelekile mayelana neziguquli zemvamisa:
1. Kuyini ukulungiswa kokuguqulwa kwemvamisa? Kusho ukuthini?
Kuziguquli zefrikhwensi ezilawulwa yidijithali, noma umyalo wefrikhwensi uyisignali ye-analogi, ifrikhwensi yokuphumayo isanikezwa ngezigaba. Iyunithi encane yalo mehluko weleveli ibizwa nge-frequency conversion resolution. Ukulungiswa kokuguqulwa kwemvamisa kuvame ukuthathwa njengo-0.015~0.5Hz. Isibonelo, uma ukulungiswa kungu-0.5Hz, imvamisa engaphezu kuka-23Hz ingashintshwa ibe ngu-23.5 kanye no-24.0 Hz, ngakho-ke isenzo semoto silandelwa ngezigaba. Lokhu kudala inkinga ezinhlelweni zokusebenza ezifana nokulawulwa kokugoqa okuqhubekayo. Kulokhu, uma ukulungiswa kuzungeze u-0.015Hz, kungase futhi kuzivumelanise ngokugcwele nomehluko weleveli ongu-1r/min noma ngaphansi kwenjini enezigaba ezi-4. Ngaphezu kwalokho, amanye amamodeli anesinqumo esinikeziwe esihlukile kunesinqumo sokuphumayo.
2. Kuyini ukubaluleka kokuba namamodeli anesikhathi sokusheshisa kanye nesikhathi sokunciphisa esinganikezwa ngokwehlukana, namamodeli anesikhathi sokusheshisa kanye nokunciphisa okunganikezwa ndawonye?
Ukusheshisa nokunciphisa kunganikezwa ngokuhlukana kwezinhlobo ezahlukene zemishini, efanelekile ukusheshisa kwesikhashana, izimo zokunciphisa kancane, noma izimo lapho isikhathi somjikelezo wokukhiqiza esiqinile sidingeka kumathuluzi emishini emincane. Kodwa-ke, ezimweni ezinjengokudluliswa kwabalandeli, izikhathi zokusheshisa nezokuncishiswa zinde kakhulu, futhi kokubili izikhathi zokusheshisa nokunciphisa zinganikezwa ndawonye.
3. Kuyini i-regenerative braking?
Uma i-frequency yomyalo iyancipha ngesikhathi sokusebenza kwe-motor kagesi, izoba i-generator e-asynchronous futhi isebenze njenge-brake, ebizwa ngokuthi i-regenerative (electrical) braking. Iyunithi yokubhuleka yokusetshenziswa kwamandla ingakhulula amandla kagesi avuselelwe akhiqizwa ngesikhathi sokulawulwa kwesivinini semoto nezinye izinqubo ngesixhasi sokubhuleka ukuze sikhiqize i-torque yokubhuleka eyanele, iqinisekise ukusebenza okuvamile kwezinto zokusebenza njengeziguquli zefrikhwensi.
4. Singawathola amandla amakhulu okubhuleka?
Amandla avuselelwe kusuka kumotho agcinwa ku-capacitor yokuhlunga ye-converter frequency. Ngenxa yomthamo nokumelana ne-voltage ye-capacitor, amandla okubhuleka avuselelwayo e-converter frequency general cishe amaphesenti ayi-10 kuye kwangama-20 etorque elinganiselwe. Uma usebenzisa amayunithi okubhuleka ozikhethela wona, ingafinyelela ku-50% kuya ku-100%.
5. Uyini umsebenzi wokuvikela we-converter frequency?
Umsebenzi wokuvikela ungahlukaniswa ngezigaba ezimbili ezilandelayo: (1) ukwenza ngokuzenzakalelayo izenzo zokulungisa ngemva kokuthola izimo ezingavamile, ezifana nokuvimbela idokodo elidlulele ngokweqile kanye nokuvimbela isitendi sokukhuphuka kogesi esikhiqiza kabusha. (2) Ngemva kokuthola okungavamile, vimba isignali yokulawula ye-PWM yedivayisi ye-semiconductor yamandla ukuze umise injini ngokuzenzakalelayo. Okufana nokunqanyulwa kwe-overcurrent, ukunqanyulwa kwe-overvoltage yokuvuselela kabusha, ukushisa okweqile kwefeni kwe-semiconductor, kanye nokuvikela ukuphela kukagesi ngokushesha.
6. Kungani umsebenzi wokuvikela wesiguquli sefrikhwensi usebenza lapho i-clutch ilayishwa ngokuqhubekayo?
Lapho uxhuma umthwalo nge-clutch, ngesikhathi sokuxhuma, i-motor ishintsha ngokushesha ukusuka esimweni esingalayishiwe ukuya endaweni enezinga elikhulu lokushelela. I-current enkulu egelezayo idala ukuthi inverter ihambe ngenxa yokudlula i-current futhi ayikwazi ukusebenza.
7. Kungani i-frequency converter ima lapho izinjini ezinkulu zisebenza ndawonye efekthri eyodwa?
Lapho i-motor iqala, i-current yokuqala ehambisana namandla ayo izogeleza, futhi i-transformer ohlangothini lwe-stator ye-motor izokhipha ukwehla kwe-voltage. Uma umthamo wemoto mkhulu, lokhu kwehla kwamandla kagesi nakho kuzoba nomthelela omkhulu. Isiguquli semvamisa esixhunywe ku-transformer efanayo sizokwenza isahlulelo sokungabi namandla noma ukumisa ngokushesha, ngakho-ke kwesinye isikhathi umsebenzi wokuvikela (IPE) uzocushwa, okubangele ukuthi uyeke ukusebenza.
8. Kusho ukuthini umsebenzi wokuvimbela itafula?
Uma isikhathi esinikeziwe sokusheshisa sisifushane kakhulu futhi imvamisa yokuphuma kwesiguquli semvamisa ishintsha kakhulu kunejubane (imvamisa ye-angular kagesi), isiguquli sefrikhwensi sizokhubeka futhi siyeke ukusebenza ngenxa ye-overcurrent, ebizwa ngokuthi i-stall. Ukuze uvimbele injini ukuthi ingaqhubeki nokusebenza ngenxa ye-stall, kuyadingeka ukuthola ubukhulu bamanje bokulawula imvamisa. Uma i-acceleration yamanje iphezulu kakhulu, yehlisa izinga lokusheshisa ngokufanele. Okufanayo kusebenza lapho wehlisa ijubane. Inhlanganisela yakho kokubili umsebenzi wokudayisa.
9. Ingabe kukhona ukuvinjelwa endleleni yokufaka lapho ufaka isiguquli sefrikhwensi?
Isakhiwo sangaphakathi nangemuva se-converter ye-frequency sicabangela umphumela wokupholisa, futhi ubudlelwano obuqondile bubalulekile ekungeneni komoya. Ngakho-ke, ezinhlotsheni zamayunithi ezifakwe ngaphakathi kwediski noma ezilenga odongeni, kufanele zifakwe zibheke phezulu ngangokunokwenzeka.
10. Inverter overvoltage
I-alamu ye-Overvoltage ngokuvamile ivela lapho umshini umisiwe, futhi isizathu sawo esiyinhloko ukuthi isikhathi sokunciphisa sifushane kakhulu noma kunezinkinga nge-resistor yokubhuleka kanye neyunithi yokubhuleka.
11. Izinga lokushisa lesiguquli sefrikhwensi liphezulu kakhulu
Ngaphezu kwalokho, isiguquli semvamisa sibuye sibe nephutha lokushisa eliphezulu. Uma i-alamu yezinga lokushisa eliphezulu ivela futhi inzwa yezinga lokushisa ihlolwe ukuthi ijwayelekile, ingase ibangelwe ukuphazamiseka. Iphutha lingavikelwa, futhi ifeni kanye nokungena komoya kwesiguquli sefrikhwensi nakho kufanele kubhekwe. Kwezinye izinhlobo zamaphutha, kungcono ukuthintana nomkhiqizi ukuze uthole izixazululo ezisheshayo nezingenzeka.
12. I-Overcurrent yinto evame kakhulu ye-alamu yokuguqula imvamisa.
I-Inverter overcurrent phenomenon
(1) Lapho iqala kabusha, iyakhubeka ngokushesha nje lapho ijubane likhuphuka. Lesi yisimo esibi kakhulu se-overcurrent. Izizathu eziyinhloko yilezi: umthwalo wesifunda esifushane, izingxenye zemishini zibambekile; Imojula ye-inverter yonakele; Kubangelwa izenzakalo ezifana netorque enganele yemoto kagesi.
(2) Ukweqa lapho kuvuliwe, lesi simo ngokuvamile asikwazi ukusethwa kabusha, ikakhulukazi ngenxa yokwehluleka kwemojula, ukwehluleka kokujikeleza kwedrayivu, kanye nokuhluleka kwesekethe yokuthola kwamanje. Izizathu eziyinhloko zokungakhubeki ngokushesha ngesikhathi sokuqalisa kabusha kodwa ngesikhathi sokusheshisa yilezi: isikhathi sokusheshisa sisethwe sifushane kakhulu, umkhawulo wamanje ophezulu usethwe ube mncane kakhulu, futhi isinxephezelo se-torque (V/F) sisethwe phezulu kakhulu.
13. Kungenzeka yini ukufaka injini ngqo ku-inverter yefrikhwensi engaguquki ngaphandle kokusebenzisa isiqalo esithambile?
Kungenzeka kumafrikhwensi aphansi kakhulu, kodwa uma i-frequency enikeziwe iphezulu, izimo zokuqala ngokuqondile nge-frequency efanayo yamandla ziyefana. Lapho i-current enkulu yokuqala (izikhathi ezingu-6-7 i-current rated) igeleza, i-motor ayikwazi ukuqala ngenxa ye-inverter yokusika i-overcurrent.
14. Yiziphi izinkinga okufanele ziqashelwe lapho injini isebenza ngaphezu kuka-60Hz?
Uma usebenza ngaphezu kwe-60Hz, kufanele kuthathwe izinyathelo zokuphepha ezilandelayo
(1) Imishini nemishini kufanele isebenze ngalesi sivinini ngokugcwele ngangokunokwenzeka (amandla emishini, umsindo, ukudlidliza, njll.)
(2) Lapho i-motor ingena ebangeni eliphumayo lamandla angashintshi, i-torque yayo yokuphuma kufanele ikwazi ukugcina ukusebenza (amandla okukhipha ama-shaft afana namafeni namaphampu akhuphuka ngokulinganayo ne-cube yejubane, ngakho-ke kufanele kukhokhwe lapho ijubane likhuphuka kancane).
(3) Indaba yokuthwala ubude besikhathi sokuphila kufanele icatshangelwe ngokugcwele.
Kuzokwenzekani uma isiguquli sefrikhwensi singasetshenziswa isikhathi eside?
1. Uketshezi olugcobayo lwama-bearings we-frequency converter fan yomile, okuthinta ukusetshenziswa kwalo.
2. Ama-capacitor okuhlunga ama-voltage aphezulu athambekele ekuqhumeni uma engasetshenziswa isikhathi eside, kuyilapho ama-electrolytic capacitor aphansi-voltage ejwayele ukuvuza.