Umhlinzeki weyunithi ye-frequency converter braking ukukhumbuza ukuthi ohlelweni lokushayela olwakhiwe igridi yamandla, isiguquli sefrikhwensi, isithuthuthu, nomthwalo, amandla angadluliselwa kuzo zombili izinkomba. Lapho i-motor ikumodi yokusebenza yemoto kagesi, amandla kagesi adluliselwa kusuka kugridi kuya kumotho ngokusebenzisa isiguquli semvamisa, aguqulwa abe amandla omshini ukushayela umthwalo, futhi umthwalo ngakho-ke unamandla e-kinetic noma angaba namandla; Lapho umthwalo ukhulula la mandla ukuze uguqule isimo sokunyakaza, injini ishayelwa umthwalo bese ingena kumodi yokusebenza yejeneretha, iguqule amandla emishini abe amandla kagesi futhi iwabuyisele kusiguquli samafrikhwensi esisekupheleni. Lawa mandla empendulo abizwa ngokuthi amandla okubhuleka avuselelayo, angabuyiselwa kugridi ngesiguquli sefrikhwensi noma adliwe kuma-resistors okubhuleka ebhasini le-DC lesiguquli se-frequency (ibhuleki yokusetshenziswa kwamandla). Kunezindlela ezine ezivame ukusetshenziswa zokubhuleka zeziguquli zefrikhwensi.
1. Ukubhuleka ukusetshenziswa kwamandla
Indlela ye-braking yokusetshenziswa kwamandla isebenzisa i-chopper kanye ne-braking resistor, futhi isebenzisa i-resistor yokubhuleka esethwe kusekethe ye-DC ukuze imunce amandla kagesi avuselelwayo enjini, ifinyelele ukubhuleka ngokushesha kwesiguquli sefrikhwensi.
Izinzuzo zokubhuleka ukusetshenziswa kwamandla:
Ukwakhiwa okulula, akukho ukungcola kugridi yamandla (uma kuqhathaniswa nokulawula impendulo), kanye nezindleko eziphansi;
Ububi bokubhuleka ukusetshenziswa kwamandla:
Ukusebenza kahle kokusebenza kuphansi, ikakhulukazi ngesikhathi sokubhuleka njalo, okuzodla inani elikhulu lamandla futhi kwandise umthamo we-resistor yokubhuleka.
2. Ukubhuleka impendulo
Indlela yokubhuleka impendulo isebenzisa ubuchwepheshe obusebenzayo be-inverter ukuze iguqule amandla kagesi avuselelwe abe amandla e-AC wefrikhwensi efanayo nesigaba njengegridi yamandla futhi iwabuyisele kugridi yamandla, ngaleyo ndlela kuzuzwe ukubhuleka.
Iyunithi ye-Inverter ethize yempendulo ye-braking yamandla
Ukuze uzuze ukubhuleka kwempendulo yamandla, izimo ezifana nokulawula i-voltage ngefrikhwensi efanayo nesigaba, ukulawulwa kwamanje kwempendulo, njll. kuyadingeka.
Izinzuzo ze-feedback braking:
Ingasebenza ngama-quadrants amane, futhi impendulo yamandla kagesi ithuthukisa ukusebenza kahle kwesistimu;
Ububi be-feedback braking:
Le ndlela yokubhuleka impendulo ingasetshenziswa kuphela ngaphansi kukagesi wegridi ozinzile ongajwayele ukuba namaphutha (nokushintshashintsha kwegridi kagesi okungeqile ku-10%). Ngoba ngesikhathi sokusebenza kwe-braking yokukhiqiza amandla, uma isikhathi sephutha le-voltage yegridi yamandla sikhulu kuno-2ms, ukwehluleka kokushintsha kungase kwenzeke futhi izingxenye zingalimala.
Okwesibili, kukhona ukungcoliswa kwe-harmonic kugridi yamandla ngesikhathi sempendulo;
Izilawuli ezintathu ziyinkimbinkimbi futhi zibiza.
3. DC braking
Incazelo ye-DC braking:
I-DC braking ngokuvamile ibhekisela lapho imvamisa yokuphumayo yesiguquli sefrikhwensi isondela ku-zero futhi ijubane lemoto lehla lifika enanini elithile, isiguquli sefrikhwensi sishintsha ukuze sethule i-DC ekujikeni kwe-stator ye-asynchronous motor, yakhe inkambu kazibuthe emile. Ngalesi sikhathi, injini isesimweni sokubhuleka esidla amandla, izungeza i-rotor ukuze isike indawo kazibuthe emile futhi ikhiqize i-torque yokubhuleka, okubangela ukuthi injini ime ngokushesha.
Ingasetshenziswa ezimweni lapho ukupaka okunembile kuyadingeka noma lapho i-brake motor ijikeleza ngokungavamile ngenxa yezinto zangaphandle ngaphambi kokuqala.
Izici ze-DC braking:
Ivelu ye-DC braking voltage iwukusetha kwetorque yokubhuleka. Ngokusobala, lapho inertia enkulu yesistimu yokushayela, inani le-DC braking voltage kufanele libe phezulu. Ngokuvamile, i-voltage elinganiselwe yokuphumayo yesiguquli se-frequency ene-voltage ye-DC ecishe ibe ngu-15-20% icishe ibe ngu-60-80V, kanti abanye basebenzisa iphesenti le-braking current;
Isikhathi sokubhuleka se-DC sisho isikhathi esisithathayo ukuze usebenzise i-DC yamanje ekujikeni kwe-stator, okufanele kube yinde kancane kunesikhathi sokuphumula esidingekayo;
Imvamisa yokuqala ye-DC braking, lapho imvamisa yokusebenza ye-inverter yehla ngezinga elithile, iqala ukushintsha isuka ku-energy braking iye ku-DC braking, okuhlobene nezidingo zomthwalo wesikhathi sokubhuleka. Uma zingekho izidingo eziqinile, imvamisa yokuqala ye-DC braking kufanele isethwe ibe mncane ngangokunokwenzeka;
4. Ukwabelana ngempendulo yebhasi le-DC
Umgomo wendlela yokubhuleka impendulo yebhasi ye-DC okwabelwana ngayo ukuthi amandla okuvuselela emoto A abuyiselwa ebhasini elivamile le-DC, bese amandla okuvuselela esetshenziswa injini B;
Indlela evamile yokubhuleka impendulo yebhasi le-DC ingahlukaniswa ngezinhlobo ezimbili: i-DC evamile yebhasi ebhalansisiwe yokubhuleka kanye ne-DC evamile yebhasi ye-DC yokubhuleka impendulo;