Umhlinzeki we-Crane ethize we-frequency converter ukukhumbuza ukuthi izithasiselo zamabhuleki zingahlala zibonakala ekulawuleni kwansuku zonke kwezimboni zama-cranes. Abanye abantu baphinde bayibize nge-brake resistors. Imuphi umsebenzi othize ewudlalayo ohlelweni lukagesi lwama-cranes? Futhi amanye ama-cranes asebenzisa iyunithi yokubhuleka (i-braking chopper), buyini ubuhlobo phakathi kwayo ne-resistor yokubhuleka? Namuhla sizokhuluma ngemisebenzi nemigomo yokusebenza ye-braking resistors kanye namayunithi okubopha ngokuningiliziwe.
Indlela yokubhuleka yokusebenzisa amandla e-Crane
I-Braking resistor, ukufingqa umsebenzi wayo ngegama elilodwa: "isizukulwane sokushisa". Ukuyibeka ngokomsebenzi, kuwukuguqula amandla kagesi engeziwe abe amandla ashisayo futhi uwadle.
Kunezinhlobo eziningi zezinqamuleli zamabhuleki ngokwesakhiwo, okuhlanganisa izinto ezivimbela amabhuleki kathayela, izitha ze-aluminium shell brake resistors, i-stainless steel stainless brake resistors, nokunye. Ukukhetha okuqondile kuncike endaweni yokusebenza. Ngayinye inezinzuzo zayo kanye nokubi.
Futhi singafingqa umsebenzi wayo ngegama elilodwa: 'shintsha'. Yebo, empeleni wushintsho oluthuthuke kakhulu. Ngokungafani nokushintsha okujwayelekile, ngaphakathi kuyi-transistor yamandla aphezulu i-GTR. Ingadlula i-current enkulu futhi ingavulwa futhi ivalwe ngefrikhwensi yokusebenza ephezulu, ngesikhathi sokusebenza ngama-millisecond.
Ngemva kokuthola ukuqonda okujwayelekile kweyunithi ye-braking resistor kanye ne-braking, manje ake sibheke umdwebo wabo wezintambo ngesiguquli sefrikhwensi.
Indlela yokubhuleka yokusebenzisa amandla e-Crane
Ngokuvamile, ama-inverter anamandla aphansi aneyunithi yokubhuleka eyakhelwe ku-inverter, ngakho-ke ungakwazi ukuxhuma ngokuqondile isixhasi sokubhuleka kumatheminali we-inverter.
Ake siqale siqonde amaphuzu amabili olwazi.
Okokuqala, i-voltage yebhasi evamile yesiguquli sefrikhwensi iseduze kwe-DC540V (imodeli ye-AC 380V). Uma i-motor isesimweni sokukhiqiza, i-voltage yebhasi izodlula i-540V, enenani eliphakeme elivumelekile lika-700-800V. Uma leli nani eliphezulu lidlulwa isikhathi eside noma njalo, isiguquli semvamisa sizolimala. Ngakho-ke, amayunithi okubhuleka nama-resistors ama-braking asetshenziselwa ukusetshenziswa kwamandla ukuvimbela i-voltage yebhasi eyeqile.
Okwesibili, kunezimo ezimbili lapho injini ingashintsha khona isuka esimweni sikagesi iye esimweni esikhiqizayo:
A, Ukwehliswa okusheshayo noma isikhathi sokunciphisa esifushane kakhulu semithwalo ephezulu ye-inetia.
B, Ihlala ikumodi yokukhiqiza amandla lapho umthwalo uphakanyiswa futhi wehliswa.
Ngomshini wokuphakamisa u-crane, kubhekisela esikhathini lapho ukuphakamisa nokwehlisa ukwehla kuma, kanye nesikhathi lapho injini isesimweni sokukhiqiza amandla ngesikhathi sokwehlisa umthwalo osindayo. Ungacabanga ngendlela yokuhumusha ngokwakho.
Inqubo yesenzo seyunithi yokubhuleka:
a、 Lapho i-motor kagesi incipha 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 ama-freewheeling diode ayisithupha esigabeni se-inverter se-frequency converter, elokhu inyusa i-voltage yebhasi ye-DC ngaphakathi kwesiguquli sefrikhwensi.
b, Lapho i-voltage ye-DC ifinyelela ku-voltage ethile (i-voltage yokuqala yeyunithi yokubhuleka, njenge-DC690V), ishubhu yokushintsha amandla yeyunithi yokubhuleka iyavuleka bese igeleza yamanje iye ku-resistor yokubhuleka.
c, I-resistor yokubhuleka ikhulula ukushisa, idonsa amandla okuvuselela, inciphisa isivinini semoto, futhi yehlisa i-voltage yebhasi ye-DC yesiguquli sefrikhwensi.
d, Lapho i-voltage yebhasi ye-DC yehla iye ku-voltage ethile (i-braking unit stop voltage efana ne-DC690V), i-transistor yamandla yeyunithi yokubhuleka iyavalwa. Ngalesi sikhathi, ayikho i-braking current egeleza ku-resistor, futhi isixhasi se-braking sichitha ukushisa ngokwemvelo, sinciphisa izinga lokushisa laso.
e, Lapho i-voltage yebhasi le-DC ikhuphuka futhi ukuze ivule iyunithi yokubhuleka, iyunithi yokubhuleka izophinda inqubo engenhla ukuze ibhalansise i-voltage yebhasi futhi iqinisekise ukusebenza okuvamile kwesistimu.
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 enesikhathi sokubhuleka sezinga le-ms, izinkomba zokusebenza zesikhashana zamandla okuvula nokuvala amandla adingekayo ukuze kube phansi, futhi ngisho nesikhathi sokuvala siyadingeka ukuba sibe sifushane ngangokunokwenzeka ukuze kuncishiswe ukucisha 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.