Umphakeli weyunithi ye-frequency converter braking unit ukukhumbuza ukuthi isiguquli sefrikhwensi iyithuluzi lokulawula amandla elisebenzisa ubuchwepheshe bokuguqula ama-frequency kanye nobuchwepheshe be-microelectronics ukulawula amamotho e-AC ngokushintsha imvamisa yamandla okusebenza kwemoto. Isiguquli sefrikhwensi sakhiwe ngokuyinhloko ukulungiswa kabusha (AC kuya ku-DC), ukuhlunga, ukuguqulwa (i-DC kuya ku-AC), iyunithi yokubhuleka, iyunithi yokushayela, iyunithi yokubona, iyunithi ye-microprocessor, njll.
1. Ukonga amandla ngokulungisa isivinini
Ukuze kuqinisekiswe ukwethembeka kwemishini yokukhiqiza, amabhizinisi ezimboni ashiya umkhawulo othile phakathi komthamo wokushayela nomthwalo wokuklama. Ngakho-ke, ama-motor amaningi angase angasebenzi ngokugcwele, okuholela ekusetshenzisweni kwe-torque ngokweqile kanye nokwanda kokusetshenziswa kwamandla asebenzayo, okuholela ekumoshweni kwamandla kagesi. Kulesi simo, umsebenzi wokulawula isivinini we-frequency converter unganciphisa isivinini sokusebenza semoto, ngaleyo ndlela unciphise ukusetshenziswa kwamandla kagesi ngenkathi ugcina i-voltage engaguquki.
Uma ijubane lemoto lehla lisuka ku-N1 liye ku-N2, amandla ayo e-shaft P azoba:
P2/P1 = (N2/N1)3
Kuyabonakala ukuthi ukunciphisa isivinini semoto kungafinyelela izinga le-cubic lokonga amandla.
2. Ukonga amandla ngokulungiswa okuguquguqukayo kokusebenza kahle
Isilinganiso esizilungisele sona kanye nomsebenzi ophumayo wokulawula wesiguquli sefrikhwensi sihlala siqapha izinguquko zomthwalo futhi senza izinguquko ngokushesha ukuze sivumelane nezinguquko zokulayisha, ngaleyo ndlela sigcine ukusebenza kahle okuphezulu kokuphuma kwemoto ngaso sonke isikhathi.
3. Ukonga amandla ngokusebenzisa umsebenzi we-V/F
Ngaphansi kwesimo sokuqinisekisa i-torque ephumayo yemoto, isiguquli semvamisa singalungisa ngokuzenzakalelayo ijika le-V/F, sinciphise i-torque ye-motor futhi sehlise okokufaka kwamanje, ngaleyo ndlela kufinyelele umgomo wokonga amandla.
4. Ukonga amandla ngokuqalisa umsebenzi othambile
Njengoba kwaziwa kahle, lapho i-motor iqala ku-voltage egcwele, yamanje emuncwa kugridi yamandla ngokwezidingo ze-torque yokuqala ye-motor cishe izikhathi eziyi-7 zamanje ezilinganiselwe zenjini. Kodwa-ke, uma ukuqala kwamanje kukhulu, akuchithi nje kuphela ugesi, kodwa futhi kubangela ukushintshashintsha okuphawulekayo ku-voltage yegridi yamandla. Ukushintshashintsha okuqhubekayo kugridi yamandla kuzophinde kwenyuse ukulahleka kolayini nokulahlekelwa kwe-transformer. Ngomsebenzi wokuqala othambile wesiguquli se-frequency, isiqalo samanje senjini singakhula kancane kancane sisuka ku-0 siye kwesamanje esilinganiselwe semoto, sinciphise ngempumelelo umthelela wamanje oqalayo kugridi yamandla. Lokhu akugcini nje ukunciphisa ukuchithwa kwamandla kagesi aphezulu, kodwa futhi kunciphisa umthelela omkhulu wokuqalisa inertia kumishini, ukunciphisa ukulahlekelwa ukuphila kwemishini.
5. Ukonga amandla ngokwenza ngcono isici samandla
Iningi lama-asynchronous motors ezigaba ezintathu ayingxenye yemithwalo ye-inductive, futhi ngenxa yenani elikhulu lamandla asebenzayo amuncwa injini ngesikhathi sokusebenza, isici samandla siphansi. Ngemuva kokwamukela isiguquli sefrikhwensi, izici zayo ziba yi-AC-DC-AC. Ngenqubo yokulungiswa nokuhlunga kwesiguquli sefrikhwensi, izici ze-impedance zegridi yamandla ziba ukumelana, okuthuthukisa isici samandla futhi kunciphise ukulahleka kwamandla asebenzayo.
Sekukonke, iziguquli zefrikhwensi zinemiphumela ethile yokonga amandla ezimeni eziningi, futhi zibe nemiphumela ebaluleke kakhulu ezimeni ezithile. Ngakho-ke, njengokuqanjwa okuhle kwezobuchwepheshe, iziguquli zemvamisa kufanele zithuthukiswe ngamandla.