Abahlinzeki beyunithi yamabhuleki bakukhumbuza ukuthi iziguquli zefrikhwensi ezisetshenziswa kakhulu zikhethwa ngokusekelwe ezicini zomthwalo, ububanzi besivinini, ukunemba kwesivinini esimile, kanye nezidingo zokuqala ze-torque zemishini yokukhiqiza; Futhi abaguquli befrikhwensi abavame ukusetshenziswa basebenzisa imodi yokulawula ye-V/F noma imodi yokulawula i-vector; Injini eguquguqukayo eyimvamisa eyishayelayo ihluke kakhulu kumamotho ajwayelekile, futhi lolu hlobo lwemoto lubuye lufanele uhla lwamafrikhwensi olubanzi, ngakho-ke ukusebenza kwemvamisa ephansi yesikhathi eside kwesiguquli semvamisa akulimazi isiguquli semvamisa; Kodwa-ke, uma isiguquli semvamisa sisebenza kumaza aphansi isikhathi eside, kuyadingeka ukuthi sicabangele ngokugcwele indawo yaso yokufaka kanye nokusebenza kahle komoya omncane.
Ukuyibeka ngokuya ngemodi yokulawula ye-V/F, isiguquli semvamisa sishintsha imvamisa yamandla kagesi ngenkathi sishintsha i-voltage ye-motor power supply, ukuze kugcinwe ukuguquguquka okuthile kazibuthe kwemoto. Ngaphakathi kwebanga elibanzi lejubane, ukusebenza kahle namandla factor yenjini akunciphi.
Ngenxa yokuthi ilawula isilinganiso se-voltage (V) ukuya kumafrikhwensi (F), ibizwa nge-V/F control. Futhi izici zayo zokulawula i-V/F ziyisakhiwo esilula sokulawula isifunda, izindleko eziphansi, nobulukhuni obuhle bemishini, obungakwazi ukuhlangabezana nezidingo zokulawula ijubane elibushelelezi lokudluliswa okujwayelekile.
Phakathi nenqubo yokuphuma kwemvamisa yesiguquli sefrikhwensi ekhuphuka isuka ku-0Hz iye kufrikhwensi eyisisekelo, ulayini we-V/F lapho i-voltage ephumayo ikhuphuka ngokulinganayo ukusuka ku-0V ukuya ku-voltage ephezulu yokuphumayo ibizwa ngokuthi umugqa we-V/F oyisisekelo.
Amapharamitha wesici ayisisekelo we-V/F achaziwe. Njengamanje iwuhlobo olusetshenziswa kakhulu lwesiguquli semvamisa. Lapho imvamisa yokuphuma kwesiguquli sefrikhwensi ikhuphuka isuka ku-0Hz iye ku-50Hz, i-voltage ephumayo ikhuphuka ngokulinganayo isuka ku-0V iye ku-380V.
Kusukela encazelweni yamapharamitha wesici se-V/F, kungabonakala ukuthi kukhona i-FL (emele imvamisa ephansi yomugqa ophansi), i-FH (emele imvamisa yomkhawulo ongaphezulu), i-FB (emele imvamisa elinganiselwe), kanye ne-Fmax (emele imvamisa ephezulu); Isibonelo, lesi siguquli se-V/F sinobubanzi obungu-50-500Hz, imvamisa elinganiselwe ye-50Hz, imvamisa yokusebenza eyisisekelo ye-1-500Hz, kanye ne-voltage ephezulu eyisisekelo yokuphuma kwe-1-480V;
Ngaphezu kwalokho, kubalulekile ukunaka ukulungiselelwa kwejika le-V/F lesiguquli semvamisa futhi wamukele izilungiselelo ezihambisanayo zezakhiwo ezihlukene zomthwalo; Ngoba ijika le-V/F linezilungiselelo eziningi zokulawula; Ngaphezu kwalokho, amaphuzu kagesi amaningi adinga ukulungiswa ngokuvumelana nezimo zomthwalo womuntu siqu (0.00~100%), futhi amanani azenzakalelayo asethwe i-inverter efektri angase angazifanele yena.