Labo abanokuqonda okuyisisekelo kweziguquli ze-crane frequency bazothola ukuthi izithasiselo zamabhuleki zingahlala zibonakala kuma-cranes. Abanye abantu babuye bazibize ngama-brake resistors. Kungani kunjalo? Iyiphi indima ethile edlalayo ohlelweni lukagesi lwe-crane? Futhi amanye ama-cranes anomshini waphezulu obizwa nge-brake unit (i-brake chopper), kuyini lokhu? Buyini ubudlelwano phakathi kwayo ne-braking resistor? Namuhla sizokhuluma ngemisebenzi nemigomo yokusebenza ye-braking resistors kanye namayunithi okubopha ngokuningiliziwe.
Imishini yokubhuleka ye-Crane frequency converter
I-Braking resistor, ake ngifingqe umsebenzi wayo ngegama elilodwa, elithi "heater". Ukuyibeka ngokomsebenzi, kuwukuguqula amandla kagesi 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.
Imishini yokubhuleka ye-Crane frequency converter
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.