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 (i-AC kuya ku-DC), ukuhlunga, ukuguqulwa (i-DC kuya ku-AC), iyunithi yokubhuleka, iyunithi yokushayela, iyunithi yokuthola, iyunithi ye-microprocessor, njll. Isiguquli sefrikhwensi silungisa i-voltage kanye nemvamisa yokuphuma kwamandla okuphumayo ngokunqamula i-IGBT yangaphakathi, inikeze amandla kagesi adingekayo ngokuvumelana nezidingo zangempela zenjini, ngaleyo ndlela kuzuzwe ukulawulwa kokugcinwa kwamandla kanye nesivinini. Ukwengeza, isiguquli semvamisa siphinde sibe nemisebenzi eminingi yokuvikela, efana ne-overcurrent, overvoltage, ukuvikela ukugcwala ngokweqile, njll. Ngokuthuthukiswa okuqhubekayo kokuzenzakalela kwemboni, iziguquli zemvamisa nazo zisetshenziswe kabanzi.
Ukuhlukaniswa kweziguquli zefrikhwensi
Kunezindlela ezahlukahlukene zokuhlukanisa ama-frequency converters. Ngokwemodi yokusebenza yesekethe eyinhloko, zingahlukaniswa zibe iziguquli zohlobo lwe-voltage kanye neziguquli zohlobo lwamanje; Ngokusho kokuhlukaniswa kwemodi yokushintsha, ingahlukaniswa ibe yiziguquli zefrikhwensi ezilawulwa yi-PAM, iziguquli zefrikhwensi ezilawulwa yi-PWM, kanye neziguquli zefrikhwensi ezilawulwa yi-PWM ezilawulwa yinkampani yenethiwekhi; Ngokomgomo wokusebenza, ingahlukaniswa ku-V/f control frequency converter, slip frequency control frequency converter, i-vector control frequency converter, njll; Ngokusetshenziswa kwazo, zingahlukaniswa zibe iziguquli zemvamisa yenhloso ejwayelekile, iziguquli ezizinikezele ezisebenza kahle kakhulu, iziguquli zefrikhwensi ephezulu, iziguquli zesigaba esisodwa kanye neziguquli zezigaba ezintathu.
I-VVVF: Shintsha i-voltage, shintsha imvamisa ye-CVCF: I-voltage eqhubekayo, imvamisa engashintshi. Amandla kagesi e-AC asetshenziswa amazwe ahlukahlukene, kungakhathaliseki ukuthi awamakhaya noma amafekthri, anogesi kanye nemvamisa engu-400V/50Hz noma 200V/60Hz (50Hz), njalo njalo. Ngokuvamile, idivayisi eguqula amandla e-AC ane-voltage engaguquki kanye nemvamisa ibe amandla e-AC ane-voltage eguquguqukayo noma imvamisa ibizwa ngokuthi "i-frequency converter". Ukuze kukhiqizwe i-voltage eguquguqukayo nefrikhwensi, idivayisi kuqala idinga ukuguqula i-alternate current of the power supply ibe yi-direct current (DC).
Isiguquli sefrikhwensi esisetshenziselwa ukulawula imoto singashintsha kokubili i-voltage nefrikhwensi.
Umgomo wokusebenza we-frequency converter
Siyazi ukuthi isisho sejubane lokuvumelanisa le-AC motor sithi:
n=60 f(1-s)/p (1)， Lapho:
N - isivinini se-asynchronous motor;
F - imvamisa ye-asynchronous motor;
S - izinga lokushelela kwemoto;
P - Inombolo yezigxobo zemoto kagesi.
Ngokwefomula, isivinini n silingana nefrequency f. Uma nje i-frequency f ishintshiwe, isivinini se-motor singashintshwa. Lapho i-frequency f ishintsha phakathi kwebanga lika-0-50Hz, ububanzi bokulungiswa kwesivinini semoto bukhulu kakhulu. Isiguquli sefrikhwensi siyindlela efanelekile yokulawula isivinini esisebenza kahle elungisa isivinini ngokushintsha imvamisa yokunikezwa kwamandla emoto.