Umphakeli weyunithi ye-frequency converter braking unit ukukhumbuza ukuthi ngokuduma kweziguquli zefrikhwensi, ukusetshenziswa kwamayunithi okubhuleka njengenye yemishini esekela iziguquli zefrikhwensi nakho kuyakhula.
1. Umsebenzi oyinhloko weyunithi yokubhuleka
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.
2. Izinzuzo zeyunithi yokubhuleka
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 futhi isikhathi sokubhuleka sisebangeni le-millisecond, izinkomba zokusebenza ngokushesha zamandla okuvula nokuvala amandla aphansi, futhi ngisho nesikhathi sokuvala siyadingeka ukuze sibe sifushane ngangokunokwenzeka ukuze kuncishiswe ukuvala 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.
3. Inqubo yesenzo seyunithi 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.