Kev tswj kev txav tau pom tseeb lub sijhawm, nws yog kev sib xyaw ua ke ntawm ntau hom kev siv tshuab siab, siv los thawb kev lag luam automation, chaw ua haujlwm automation thiab tsev automation mus rau theem siab dua. Tam sim no, kev tswj cov lus tsa suab feem ntau yog tsim los ntawm peb qhov chaw: hloov pauv zaus tsav (VFD), lub cev muaj zog thiab tus tswj hwm.
VFD hauv zos
Lub hauv paus ntawm VFD yog lub zog hluav taws xob hluav taws xob thiab cov txheej txheem tswj.
1) Cov khoom siv hluav taws xob hluav taws xob Cov khoom siv hluav taws xob hluav taws xob muaj nyob rau hauv Circuit Court los ua lub luag haujlwm ntawm kev tawm thiab ua tiav ntau yam kev hloov pauv, VFD yog qhov kev teeb tsa ntawm lub converter no, yog li nws yog nqa tawm nrog kev txhim kho ntawm inverter qhov chaw, qhov zoo ntawm inverter Cheebtsam nyob ntawm nws lub peev xwm ntawm-tawm, lees txais qhov hluav taws xob tam sim no thiab ntsuas hluav taws xob; Qhov loj ntawm qhov poob hauv cov txheej txheem on-off, xws li saturation voltage poob thiab hloov pauv, txiav txim siab qhov ua tau zoo thiab ntim ntawm VFD; Hloov qhov poob muaj feem xyuam rau qhov hloov zaus; Qhov hloov zaus muaj feem cuam tshuam rau lub suab nrov, tab sis kuj yog rau cov zis voltage thiab tam sim no waveform. Uas yog hais tias, lub zog hluav taws xob cov khoom siv hluav taws xob yuav tsum tau ua nyob rau hauv cov kev taw qhia ntawm high voltage, loj tam sim no, high switching zaus thiab me me on-voltage poob. Thyristor yog ib tug semi-tshuaj ntaus ntawv, teej tug mus rau thawj tiam ntawm cov khoom, tab sis tsawg modulation zaus, complex tswj, tsis tshua muaj efficiency, loj muaj peev xwm, high voltage, ntev keeb kwm, txawm siv raws li rectification los yog inverter, kuj mature.
Cov cuab yeej tswj tau tag nrho GTO thyristors thiab BJTs, txawm hais tias nws yog sib sau ua ke DC choppers lossis sib sau VFDs, GTO thyristors muaj kev ywj pheej ntawm kev siv hluav taws xob locomotives. Qhov no kuj yog ib lub ntsiab lus tshawb fawb txog kev tshawb fawb loj tau tsim los daws lub sijhawm "Yim Tsib Tsib Xyoo" lub sijhawm nyob hauv Suav teb. Txawm li cas los xij, kev siv GTO thyristor VFDs rau lwm lub chaw muaj kev tsis sib haum xeeb vim tias qhov kev nce tam sim no ntawm GTO thyristors tsawg dhau, kev saib xyuas overcurrent nyuaj, thiab qhov hloov pauv zaus tsawg. DC choppers thiab PWMVFDs sib sau ua ke nrog BJTs yog nrov heev, tab sis cov zis voltage tsis tshaj 460V thiab lub peev xwm tsis tshaj 400kW. BJT yog ib qho kev tsav tam sim no, kev siv hluav taws xob loj, tsis tshua muaj kev hloov pauv zaus, thiab lub suab nrov loj, uas tsis yooj yim thiab txhim khu kev qha raws li lub zog tsav ntawm MOSFET. Tab sis tom kawg muaj lub peev xwm me dua thiab qis dua cov zis hluav taws xob, thiab tsis muaj ntau cov khoom sib tw hauv khw.
Hauv kev tswj cov lus tsa suab, lub cim tshiab ntawm cov khoom siv hluav taws xob hluav taws xob yog IGBT thiab MCT: qhov qub yog MOS tsav BJT, qhov zoo dua yog tias lub peev xwm thiab qhov hluav taws xob tau dhau BJT, thiab muaj kev nyiam los hloov nws; Lub tom kawg MOS tsav thyristors thiab theoretically muaj qhov zoo ntawm ob qho tib si. Ob lub cuab yeej tshiab no muaj cov khoom lag luam paub tab, IGBT tau ua tiav mus rau tiam thib plaub, thiab tam sim no, cov teb chaws txawv teb chaws tau hloov cov txheej txheem ntawm microelectronics rau hluav taws xob hluav taws xob, kom cov ntawv thov tshwj xeeb kev sib xyaw ua ke () raug tsim. Cov cuab yeej ntse uas sib xyaw ua ke ntawm kev tsav tsheb thiab kev tswj xyuas Circuit Court ntawm IGBT yog hu ua IPM, thiab cov khoom siv hluav taws xob hloov pauv tau ua ke nrog IPM, uas ua rau VFD txhim khu kev qha, ib zaug dhau los ua cov khoom lag luam ntawm kev tswj ceev, yuav hloov DC ceev tswj, thiab lub xyoo pua 21st yuav yog lub sijhawm ntawm AC ceev tswj.
2) Tswj txoj kev VFD txais cov kev tswj sib txawv thiab muaj qhov sib txawv ntawm kev hloov ceev, cov yam ntxwv thiab kev siv. Txoj kev tswj tau dav muab faib ua qhib-voj thiab kaw-loop tswj. Qhib-loop tswj muaj xws li U / f (voltage thiab zaus) proportional control method; Lub voj kaw muaj xws li zawv zawg zaus tswj thiab ntau yam vector tswj. Los ntawm qhov kev xav ntawm keeb kwm kev loj hlob, nws kuj yog los ntawm qhib voj mus rau kaw voj. Kev tswj vector ib txwm yog piv rau armature tam sim no tswj ntawm DC motors. Tam sim no AC lub cev muaj zog tsis tuaj yeem nres ncaj qha torque tswj, uas yooj yim thiab raug, thiab kev tswj xyuas qhov tseeb yog siab.