Umhlinzeki weyunithi yokubhuleka i-frequency converter ukukhumbuza ukuthi ohlelweni lokulawula isivinini sokuguqulwa kwemvamisa, indlela eyisisekelo yokunciphisa isivinini ukunciphisa kancane kancane imvamisa enikeziwe. Lapho inertia yesistimu yokuhudula inkulu, ukwehla kwejubane lemoto ngeke kuhambisane nokwehla kwesivinini se-synchronous motor, okungukuthi, isivinini sangempela semoto siphezulu kunejubane layo lokuvumelanisa. Ngalesi sikhathi, ukuqondiswa kwemigqa yamagnetic field esikwe yi-rotor winding ye-motor kuphambene ncamashi naleyo yokusebenza kwesivinini esingaguquki senjini. Isiqondiso samandla e-electromotive enziwe kanye namandla okujika kwe-rotor nakho kuphambene nalokho kwesiqondiso sokujikeleza kwemoto, futhi injini izokhiqiza i-torque engalungile. Ngalesi sikhathi, injini empeleni iyijeneretha, futhi uhlelo lusesimweni sokuvuselela amabhuleki. Amandla e-kinetic wesistimu yokuhudula abuyiselwa ebhasini le-DC lesiguquli sefrikhwensi, okubangela ugesi webhasi le-DC ukuthi ukhuphuke ngokuqhubekayo futhi ufinyelele ezingeni eliyingozi (njengokulimala kusiguquli sefrikhwensi).
Umgomo wokusebenza weyunithi yokubhuleka
Iyunithi yokubhuleka iqukethe i-transistor enamandla amakhulu i-GTR kanye nesekethe yayo yokushayela. Umsebenzi wayo ukwengeza ingxenye ye-braking yangaphandle ukuze kusheshiswe ukusetshenziswa kwamandla kagesi avuselelwe lapho i-capacitor yesixhumanisi sokukhipha ingakwazi ukugcina ngaphakathi kwebanga elishiwo le-voltage noma i-resistor ye-braking yangaphakathi ayikwazi ukuyidla ngesikhathi, okuholela ekusetshenzisweni kwe-overvoltage engxenyeni ye-DC.
Kwezinye izinhlelo zokusebenza, ukuncipha okusheshayo kuyadingeka. Ngokuvumelana nesimiso samamotho asynchronous, lapho ukushelela kukhulu, kuyanda i-torque. Ngokufanayo, i-torque yokubhuleka izokhula ngokunyuka kwezinga lokwehla kwejubane, ifinyeze kakhulu isikhathi sokunciphisa isistimu, isheshise impendulo yamandla, futhi ibangele ukuthi i-voltage yebhasi ye-DC inyuke ngokushesha. Ngakho-ke, amandla empendulo kufanele adliwe ngokushesha ukuze kugcinwe amandla kagesi ebhasi le-DC ngaphansi kwebanga elithile eliphephile. Umsebenzi oyinhloko wesistimu yeyunithi yokubhuleka wukuhlakaza ngokushesha amandla (aguqulwa abe amandla ashisayo yi-resistor yokubhuleka). Inxephezela ngempumelelo ububi besivinini sokubhuleka esinensayo kanye ne-torque encane yokubhuleka (≤ 20% elinganiselwe i-torque) yeziguquli zefrikhwensi evamile, futhi ifaneleka kakhulu ezimeni lapho kudingeka khona ukubhuleka ngokushesha kodwa imvamisa iphansi.
Ngenxa yokusebenza kwesikhashana kweyunithi yokubhuleka, okusho ukuthi amandla ngesikhathi mafushane kakhulu isikhathi ngasinye, ukukhuphuka kwezinga lokushisa ngesikhathi samandla ngesikhathi alikude nokuzinza; Isikhathi sesikhawu ngemva kokukhanyisa ngakunye side, lapho izinga lokushisa lanele ukwehla liye ezingeni elifanayo nezinga lokushisa le-ambient. Ngakho-ke, amandla alinganiselwe we-resistor braking azoncishiswa kakhulu, futhi intengo izokwehla ngokufanele; Ngaphezu kwalokho, ngenxa yokuthi kune-IGBT eyodwa kuphela enesikhathi sokubhuleka sezinga le-ms, izinkomba zokusebenza zesikhashana zamandla okuvula nokuvala amandla adingekayo ukuze kube phansi, futhi ngisho nesikhathi sokuvala siyadingeka ukuba sibe sifushane ngangokunokwenzeka ukuze kuncishiswe ukucisha i-pulse voltage nokuvikela i-transistor yamandla; Indlela yokulawula ilula futhi kulula ukuyisebenzisa. Ngenxa yezinzuzo ezingenhla, isetshenziswa kakhulu emithwalweni yamandla engaba khona njengama-cranes nasezimeni lapho kudingeka khona ukubhuleka ngokushesha kodwa emsebenzini wesikhashana.
Umsebenzi weyunithi yokubhuleka
1. Lapho i-motor kagesi iyancipha ngaphansi kwamandla angaphandle, isebenza esimweni sokukhiqiza, ikhiqiza amandla okuvuselela. Amandla e-electromotive ezigaba ezintathu ze-AC akhiqizwa yiyo alungiswa ibhuloho elinezigaba ezintathu elilawulwa ngokugcwele elakhiwe amayunithi ayisithupha empendulo ye-inverter ethize kanye nama-freewheeling diode engxenyeni ye-inverter ye-inverter, elokhu inyusa ngokuqhubekayo amandla kagesi webhasi le-DC ngaphakathi kwesiguquli.
2. Lapho i-voltage ye-DC ifinyelela ku-voltage ethile (i-voltage yokuqala yeyunithi yokubhuleka), ishubhu lokushintsha amandla leyunithi yokubhuleka liyavuleka futhi i-current igeleze ku-resistor yokubhuleka.
3. I-resistor yokubhuleka idedela ukushisa, imunca amandla azivuselelayo, inciphisa isivinini semoto, futhi yehlisa i-voltage yebhasi ye-DC yesiguquli sefrikhwensi.
4. Lapho i-voltage yebhasi ye-DC yehlela ku-voltage ethile (i-braking unit stop voltage), i-transistor yamandla yeyunithi yokubhuleka ivaliwe. Ngalesi sikhathi, ayikho i-braking current egeleza ku-resistor, futhi isixhasi se-braking sichitha ukushisa ngokwemvelo, sinciphisa izinga lokushisa laso.
5. Lapho i-voltage yebhasi le-DC iphakama futhi ukuze ivule iyunithi yokubhuleka, iyunithi yokubhuleka izophinda inqubo engenhla ukuze ibhalansise i-voltage yebhasi futhi iqinisekise ukusebenza okuvamile kwesistimu.